[framework/uifw/eet.git] / src / lib / Eet.h

#ifndef _EET_H
#define _EET_H

#include <stdlib.h>
#include <stdio.h>
#include <Eina.h>

#ifdef EAPI
# undef EAPI
#endif /* ifdef EAPI */

#ifdef _WIN32
# ifdef EFL_EET_BUILD
#  ifdef DLL_EXPORT
#   define EAPI __declspec(dllexport)
#  else /* ifdef DLL_EXPORT */
#   define EAPI
#  endif /* ! DLL_EXPORT */
# else /* ifdef EFL_EET_BUILD */
#  define EAPI __declspec(dllimport)
# endif /* ! EFL_EET_BUILD */
#else /* ifdef _WIN32 */
# ifdef __GNUC__
#  if __GNUC__ >= 4
#   define EAPI __attribute__ ((visibility("default")))
#  else /* if __GNUC__ >= 4 */
#   define EAPI
#  endif /* if __GNUC__ >= 4 */
# else /* ifdef __GNUC__ */
#  define EAPI
# endif /* ifdef __GNUC__ */
#endif /* ! _WIN32 */

#ifdef __cplusplus
extern "C" {
#endif /* ifdef __cplusplus */

/**
 * @file Eet.h
 * @brief The file that provides the eet functions.
 *
 * This header provides the Eet management functions.
 *
 */

#define EET_VERSION_MAJOR 1
#define EET_VERSION_MINOR 4
/**
 * @typedef Eet_Version
 *
 * This is the Eet version information structure that can be used at
 * runtiime to detect which version of eet is being used and adapt
 * appropriately as follows for example:
 *
 * @code
 * #if defined(EET_VERSION_MAJOR) && (EET_VERSION_MAJOR >= 1) && defined(EET_VERSION_MINOR) && (EET_VERSION_MINOR > 2)
 * printf("Eet version: %i.%i.%i\n",
 *        eet_version->major,
 *        eet_version->minor,
 *        eet_version->micro);
 * if (eet_version->revision > 0)
 *   {
 *     printf("  Built from SVN revision # %i\n", eet_version->revision);
 *   }
 * #endif
 * @endcode
 *
 * Note the #if check can be dropped if your program refuses to compile or
 * work with an Eet version less than 1.3.0.
 */
typedef struct _Eet_Version
{
   int major; /** < major (binary or source incompatible changes) */
   int minor; /** < minor (new features, bugfixes, major improvements version) */
   int micro; /** < micro (bugfix, internal improvements, no new features version) */
   int revision; /** < svn revision (0 if a proper rlease or the svn revsion number Eet is built from) */
} Eet_Version;

EAPI extern Eet_Version *eet_version;

/**
 * @defgroup Eet_Group Top level functions
 * Functions that affect Eet as a whole.
 *
 * @{
 */

/**
 * @enum _Eet_Error
 * All the error identifiers known by Eet.
 */
typedef enum _Eet_Error
{
   EET_ERROR_NONE, /**< No error, it's all fine! */
   EET_ERROR_BAD_OBJECT, /**< Given object or handle is NULL or invalid */
   EET_ERROR_EMPTY, /**< There was nothing to do */
   EET_ERROR_NOT_WRITABLE, /**< Could not write to file or fine is #EET_FILE_MODE_READ */
   EET_ERROR_OUT_OF_MEMORY, /**< Could not allocate memory */
   EET_ERROR_WRITE_ERROR, /**< Failed to write data to destination */
   EET_ERROR_WRITE_ERROR_FILE_TOO_BIG, /**< Failed to write file since it is too big */
   EET_ERROR_WRITE_ERROR_IO_ERROR, /**< Failed to write since generic Input/Output error */
   EET_ERROR_WRITE_ERROR_OUT_OF_SPACE, /**< Failed to write due out of space */
   EET_ERROR_WRITE_ERROR_FILE_CLOSED, /**< Failed to write because file was closed */
   EET_ERROR_MMAP_FAILED, /**< Could not mmap file */
   EET_ERROR_X509_ENCODING_FAILED, /**< Could not encode using X509 */
   EET_ERROR_SIGNATURE_FAILED, /**< Could not validate signature */
   EET_ERROR_INVALID_SIGNATURE, /**< Signature is invalid */
   EET_ERROR_NOT_SIGNED, /**< File or contents are not signed */
   EET_ERROR_NOT_IMPLEMENTED, /**< Function is not implemented */
   EET_ERROR_PRNG_NOT_SEEDED, /**< Could not introduce random seed */
   EET_ERROR_ENCRYPT_FAILED, /**< Could not encrypt contents */
   EET_ERROR_DECRYPT_FAILED /**< Could not decrypt contents */
} Eet_Error; /**< Eet error identifiers */

/**
 * @}
 */

/**
 * Initialize the EET library.
 *
 * @return The new init count.
 *
 * @since 1.0.0
 * @ingroup Eet_Group
 */
EAPI int
eet_init(void);

/**
 * Shut down the EET library.
 *
 * @return The new init count.
 *
 * @since 1.0.0
 * @ingroup Eet_Group
 */
EAPI int
eet_shutdown(void);

/**
 * Clear eet cache
 *
 * Eet didn't free items by default. If you are under memory
 * presure, just call this function to recall all memory that are
 * not yet referenced anymore.  The cache take care of modification
 * on disk.
 *
 * @since 1.0.0
 * @ingroup Eet_Group
 */
EAPI void
eet_clearcache(void);

/**
 * @defgroup Eet_File_Group Eet File Main Functions
 *
 * Functions to create, destroy and do basic manipulation of
 * #Eet_File handles.
 *
 * @{
 */

/**
 * @enum _Eet_File_Mode
 * Modes that a file can be opened.
 */
typedef enum _Eet_File_Mode
{
   EET_FILE_MODE_INVALID = -1,
   EET_FILE_MODE_READ, /**< File is read-only. */
   EET_FILE_MODE_WRITE, /**< File is write-only. */
   EET_FILE_MODE_READ_WRITE /**< File is for both read and write */
} Eet_File_Mode; /**< Modes that a file can be opened. */

/**
 * @typedef Eet_File
 * Opaque handle that defines an Eet file (or memory).
 *
 * @see eet_open()
 * @see eet_memopen_read()
 * @see eet_close()
 */
typedef struct _Eet_File         Eet_File;

/**
 * @typedef Eet_Dictionary
 * Opaque handle that defines a file-backed (mmaped) dictionary of strings.
 */
typedef struct _Eet_Dictionary   Eet_Dictionary;

/**
 * @}
 */

/**
 * Open an eet file on disk, and returns a handle to it.
 * @param file The file path to the eet file. eg: @c "/tmp/file.eet".
 * @param mode The mode for opening. Either #EET_FILE_MODE_READ,
 *        #EET_FILE_MODE_WRITE or #EET_FILE_MODE_READ_WRITE.
 * @return An opened eet file handle.
 * @ingroup Eet_File_Group
 *
 * This function will open an exiting eet file for reading, and build
 * the directory table in memory and return a handle to the file, if it
 * exists and can be read, and no memory errors occur on the way, otherwise
 * NULL will be returned.
 *
 * It will also open an eet file for writing. This will, if successful,
 * delete the original file and replace it with a new empty file, till
 * the eet file handle is closed or flushed. If it cannot be opened for
 * writing or a memory error occurs, NULL is returned.
 *
 * You can also open the file for read/write. If you then write a key that
 * does not exist it will be created, if the key exists it will be replaced
 * by the new data.
 *
 * Example:
 * @code
 * #include <Eet.h>
 * #include <stdio.h>
 * #include <string.h>
 *
 * int
 * main(int argc, char **argv)
 * {
 *   Eet_File *ef;
 *   char buf[1024], *ret, **list;
 *   int size, num, i;
 *
 *   eet_init();
 *
 *   strcpy(buf, "Here is a string of data to save!");
 *
 *   ef = eet_open("/tmp/my_file.eet", EET_FILE_MODE_WRITE);
 *   if (!ef) return -1;
 *   if (!eet_write(ef, "/key/to_store/at", buf, 1024, 1))
 *     fprintf(stderr, "Error writing data!\n");
 *   eet_close(ef);
 *
 *   ef = eet_open("/tmp/my_file.eet", EET_FILE_MODE_READ);
 *   if (!ef) return -1;
 *   list = eet_list(ef, "*", &num);
 *   if (list)
 *     {
 *       for (i = 0; i < num; i++)
 *         printf("Key stored: %s\n", list[i]);
 *       free(list);
 *     }
 *   ret = eet_read(ef, "/key/to_store/at", &size);
 *   if (ret)
 *     {
 *       printf("Data read (%i bytes):\n%s\n", size, ret);
 *       free(ret);
 *     }
 *   eet_close(ef);
 *
 *   eet_shutdown();
 *
 *   return 0;
 * }
 * @endcode
 *
 * @since 1.0.0
 */
EAPI Eet_File *
eet_open(const char   *file,
         Eet_File_Mode mode);

/**
 * Open an eet file directly from a memory location. The data are not copied,
 * so you must keep them around as long as the eet file is open. Their is
 * currently no cache for this kind of Eet_File, so it's reopen every time
 * you do use eet_memopen_read.
 *
 * @since 1.1.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_File *
eet_memopen_read(const void *data,
                 size_t      size);

/**
 * Get the mode an Eet_File was opened with.
 * @param ef A valid eet file handle.
 * @return The mode ef was opened with.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_File_Mode
eet_mode_get(Eet_File *ef);

/**
 * Close an eet file handle and flush and writes pending.
 * @param ef A valid eet file handle.
 *
 * This function will flush any pending writes to disk if the eet file
 * was opened for write, and free all data associated with the file handle
 * and file, and close the file.
 *
 * If the eet file handle is not valid nothing will be done.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_Error
eet_close(Eet_File *ef);

/**
 * Sync content of an eet file handle, flushing pending writes.
 * @param ef A valid eet file handle.
 *
 * This function will flush any pending writes to disk. The eet file must
 * be opened for write.
 *
 * If the eet file handle is not valid nothing will be done.
 *
 * @since 1.2.4
 * @ingroup Eet_File_Group
 */
EAPI Eet_Error
eet_sync(Eet_File *ef);

/**
 * Return a handle to the shared string dictionary of the Eet file
 * @param ef A valid eet file handle.
 * @return A handle to the dictionary of the file
 *
 * This function returns a handle to the dictionary of an Eet file whose
 * handle is @p ef, if a dictionary exists. NULL is returned otherwise or
 * if the file handle is known to be invalid.
 *
 * @see eet_dictionary_string_check() to know if given string came
 *      from the dictionary or it was dynamically allocated using
 *      the #Eet_Data_Descriptor_Class instructrions.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI Eet_Dictionary *
eet_dictionary_get(Eet_File *ef);

/**
 * Check if a given string comes from a given dictionary
 * @param ed A valid dictionary handle
 * @param string A valid 0 byte terminated C string
 * @return 1 if it is in the dictionary, 0 otherwise
 *
 * This checks the given dictionary to see if the given string is actually
 * inside that dictionary (i.e. comes from it) and returns 1 if it does.
 * If the dictionary handle is invlide, the string is NULL or the string is
 * not in the dictionary, 0 is returned.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_dictionary_string_check(Eet_Dictionary *ed,
                            const char     *string);

/**
 * Read a specified entry from an eet file and return data
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param size_ret Number of bytes read from entry and returned.
 * @return The data stored in that entry in the eet file.
 *
 * This function finds an entry in the eet file that is stored under the
 * name specified, and returns that data, decompressed, if successful.
 * NULL is returned if the lookup fails or if memory errors are
 * encountered. It is the job of the calling program to call free() on
 * the returned data. The number of bytes in the returned data chunk are
 * placed in size_ret.
 *
 * If the eet file handle is not valid NULL is returned and size_ret is
 * filled with 0.
 *
 * @see eet_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI void *
eet_read(Eet_File   *ef,
         const char *name,
         int        *size_ret);

/**
 * Read a specified entry from an eet file and return data
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param size_ret Number of bytes read from entry and returned.
 * @return The data stored in that entry in the eet file.
 *
 * This function finds an entry in the eet file that is stored under the
 * name specified, and returns that data if not compressed and successful.
 * NULL is returned if the lookup fails or if memory errors are
 * encountered or if the data is comrpessed. The calling program must never
 * call free() on the returned data. The number of bytes in the returned
 * data chunk are placed in size_ret.
 *
 * If the eet file handle is not valid NULL is returned and size_ret is
 * filled with 0.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI const void *
eet_read_direct(Eet_File   *ef,
                const char *name,
                int        *size_ret);

/**
 * Write a specified entry to an eet file handle
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param data Pointer to the data to be stored.
 * @param size Length in bytes in the data to be stored.
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return bytes written on successful write, 0 on failure.
 *
 * This function will write the specified chunk of data to the eet file
 * and return greater than 0 on success. 0 will be returned on failure.
 *
 * The eet file handle must be a valid file handle for an eet file opened
 * for writing. If it is not, 0 will be returned and no action will be
 * performed.
 *
 * Name, and data must not be NULL, and size must be > 0. If these
 * conditions are not met, 0 will be returned.
 *
 * The data will be copied (and optionally compressed) in ram, pending
 * a flush to disk (it will stay in ram till the eet file handle is
 * closed though).
 *
 * @see eet_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_write(Eet_File   *ef,
          const char *name,
          const void *data,
          int         size,
          int         compress);

/**
 * Delete a specified entry from an Eet file being written or re-written
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @return Success or failure of the delete.
 *
 * This function will delete the specified chunk of data from the eet file
 * and return greater than 0 on success. 0 will be returned on failure.
 *
 * The eet file handle must be a valid file handle for an eet file opened
 * for writing. If it is not, 0 will be returned and no action will be
 * performed.
 *
 * Name, must not be NULL, otherwise 0 will be returned.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_delete(Eet_File   *ef,
           const char *name);

/**
 * Alias a specific section to another one. Destination may exist or not,
 * no check are done.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param destination Destionation of the alias. eg: "/base/the_real_stuff_i_want".
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return EINA_TRUE on success, EINA_FALSE on failure.
 *
 * Name and Destination must not be NULL, otherwhise EINA_FALSE will be returned.
 *
 * @since 1.3.3
 * @ingroup Eet_File_Group
 */
EAPI Eina_Bool
eet_alias(Eet_File   *ef,
          const char *name,
          const char *destination,
          int         compress);

/**
 * List all entries in eet file matching shell glob.
 * @param ef A valid eet file handle.
 * @param glob A shell glob to match against.
 * @param count_ret Number of entries found to match.
 * @return Pointer to an array of strings.
 *
 * This function will list all entries in the eet file matching the
 * supplied shell glob and return an allocated list of their names, if
 * there are any, and if no memory errors occur.
 *
 * The eet file handle must be valid and glob must not be NULL, or NULL
 * will be returned and count_ret will be filled with 0.
 *
 * The calling program must call free() on the array returned, but NOT
 * on the string pointers in the array. They are taken as read-only
 * internals from the eet file handle. They are only valid as long as
 * the file handle is not closed. When it is closed those pointers in the
 * array are now not valid and should not be used.
 *
 * On success the array returned will have a list of string pointers
 * that are the names of the entries that matched, and count_ret will have
 * the number of entries in this array placed in it.
 *
 * Hint: an easy way to list all entries in an eet file is to use a glob
 * value of "*".
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI char **
eet_list(Eet_File   *ef,
         const char *glob,
         int        *count_ret);

/**
 * Return the number of entries in the specified eet file.
 * @param ef A valid eet file handle.
 * @return Number of entries in ef or -1 if the number of entries
 *         cannot be read due to open mode restrictions.
 *
 * @since 1.0.0
 * @ingroup Eet_File_Group
 */
EAPI int
eet_num_entries(Eet_File *ef);

/**
 * @defgroup Eet_File_Cipher_Group Eet File Ciphered Main Functions
 *
 * Most of the @ref Eet_File_Group have alternative versions that
 * accounts for ciphers to protect their content.
 *
 * @see @ref Eet_Cipher_Group
 *
 * @ingroup Eet_File_Group
 */

/**
 * Read a specified entry from an eet file and return data using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param size_ret Number of bytes read from entry and returned.
 * @param cipher_key The key to use as cipher.
 * @return The data stored in that entry in the eet file.
 *
 * This function finds an entry in the eet file that is stored under the
 * name specified, and returns that data, decompressed, if successful.
 * NULL is returned if the lookup fails or if memory errors are
 * encountered. It is the job of the calling program to call free() on
 * the returned data. The number of bytes in the returned data chunk are
 * placed in size_ret.
 *
 * If the eet file handle is not valid NULL is returned and size_ret is
 * filled with 0.
 *
 * @see eet_read()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Cipher_Group
 */
EAPI void *
eet_read_cipher(Eet_File   *ef,
                const char *name,
                int        *size_ret,
                const char *cipher_key);

/**
 * Write a specified entry to an eet file handle using a cipher.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param data Pointer to the data to be stored.
 * @param size Length in bytes in the data to be stored.
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @param cipher_key The key to use as cipher.
 * @return bytes written on successful write, 0 on failure.
 *
 * This function will write the specified chunk of data to the eet file
 * and return greater than 0 on success. 0 will be returned on failure.
 *
 * The eet file handle must be a valid file handle for an eet file opened
 * for writing. If it is not, 0 will be returned and no action will be
 * performed.
 *
 * Name, and data must not be NULL, and size must be > 0. If these
 * conditions are not met, 0 will be returned.
 *
 * The data will be copied (and optionally compressed) in ram, pending
 * a flush to disk (it will stay in ram till the eet file handle is
 * closed though).
 *
 * @see eet_write()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Cipher_Group
 */
EAPI int
eet_write_cipher(Eet_File   *ef,
                 const char *name,
                 const void *data,
                 int         size,
                 int         compress,
                 const char *cipher_key);

/**
 * @defgroup Eet_File_Image_Group Image Store and Load
 *
 * Eet efficiently stores and loads images, including alpha
 * channels and lossy compressions.
 */

/**
 * Read just the header data for an image and dont decode the pixels.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on successfull decode, 0 otherwise
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pile is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_header_read(Eet_File     *ef,
                           const char   *name,
                           unsigned int *w,
                           unsigned int *h,
                           int          *alpha,
                           int          *compress,
                           int          *quality,
                           int          *lossy);

/**
 * Read image data from the named key in the eet file.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pile is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI void *
eet_data_image_read(Eet_File     *ef,
                    const char   *name,
                    unsigned int *w,
                    unsigned int *h,
                    int          *alpha,
                    int          *compress,
                    int          *quality,
                    int          *lossy);

/**
 * Read image data from the named key in the eet file.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pile is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read_to_surface_cipher()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_read_to_surface(Eet_File     *ef,
                               const char   *name,
                               unsigned int  src_x,
                               unsigned int  src_y,
                               unsigned int *d,
                               unsigned int  w,
                               unsigned int  h,
                               unsigned int  row_stride,
                               int          *alpha,
                               int          *compress,
                               int          *quality,
                               int          *lossy);

/**
 * Write image data to the named key in an eet file.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param data A pointer to the image pixel data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return Success if the data was encoded and written or not.
 *
 * This function takes image pixel data and encodes it in an eet file
 * stored under the supplied name key, and returns how many bytes were
 * actually written to encode the image data.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns the number of bytes that were required
 * to encode the image data, or on failure it returns 0.
 *
 * @see eet_data_image_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_write(Eet_File    *ef,
                     const char  *name,
                     const void  *data,
                     unsigned int w,
                     unsigned int h,
                     int          alpha,
                     int          compress,
                     int          quality,
                     int          lossy);

/**
 * Decode Image data header only to get information.
 * @param data The encoded pixel data.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 on failure.
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_decode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_header_decode(const void   *data,
                             int           size,
                             unsigned int *w,
                             unsigned int *h,
                             int          *alpha,
                             int          *compress,
                             int          *quality,
                             int          *lossy);

/**
 * Decode Image data into pixel data.
 * @param data The encoded pixel data.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_decode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI void *
eet_data_image_decode(const void   *data,
                      int           size,
                      unsigned int *w,
                      unsigned int *h,
                      int          *alpha,
                      int          *compress,
                      int          *quality,
                      int          *lossy);

/**
 * Decode Image data into pixel data.
 * @param data The encoded pixel data.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (alpha, compress etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_decode_to_surface_cipher()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Group
 */
EAPI int
eet_data_image_decode_to_surface(const void   *data,
                                 int           size,
                                 unsigned int  src_x,
                                 unsigned int  src_y,
                                 unsigned int *d,
                                 unsigned int  w,
                                 unsigned int  h,
                                 unsigned int  row_stride,
                                 int          *alpha,
                                 int          *compress,
                                 int          *quality,
                                 int          *lossy);

/**
 * Encode image data for storage or transmission.
 * @param data A pointer to the image pixel data.
 * @param size_ret A pointer to an int to hold the size of the returned data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return The encoded image data.
 *
 * This function stakes image pixel data and encodes it with compression and
 * possible loss of quality (as a trade off for size) for storage or
 * transmission to another system.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns a pointer to the encoded data that you
 * can free with free() when no longer needed.
 *
 * @see eet_data_image_encode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Group
 */
EAPI void *
eet_data_image_encode(const void  *data,
                      int         *size_ret,
                      unsigned int w,
                      unsigned int h,
                      int          alpha,
                      int          compress,
                      int          quality,
                      int          lossy);

/**
 * @defgroup Eet_File_Image_Cipher_Group Image Store and Load using a Cipher
 *
 * Most of the @ref Eet_File_Image_Group have alternative versions
 * that accounts for ciphers to protect their content.
 *
 * @see @ref Eet_Cipher_Group
 *
 * @ingroup Eet_File_Image_Group
 */

/**
 * Read just the header data for an image and dont decode the pixels using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on successfull decode, 0 otherwise
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pile is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_read()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_header_read_cipher(Eet_File     *ef,
                                  const char   *name,
                                  const char   *cipher_key,
                                  unsigned int *w,
                                  unsigned int *h,
                                  int          *alpha,
                                  int          *compress,
                                  int          *quality,
                                  int          *lossy);

/**
 * Read image data from the named key in the eet file using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pile is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_read()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI void *
eet_data_image_read_cipher(Eet_File     *ef,
                           const char   *name,
                           const char   *cipher_key,
                           unsigned int *w,
                           unsigned int *h,
                           int          *alpha,
                           int          *compress,
                           int          *quality,
                           int          *lossy);
   
/**
 * Read image data from the named key in the eet file using a cipher.
 * @param ef A valid eet file handle opened for reading.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function reads an image from an eet file stored under the named
 * key in the eet file and return a pointer to the decompressed pixel data.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pile is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_read_to_surface()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_read_to_surface_cipher(Eet_File     *ef,
                                      const char   *name,
                                      const char   *cipher_key,
                                      unsigned int  src_x,
                                      unsigned int  src_y,
                                      unsigned int *d,
                                      unsigned int  w,
                                      unsigned int  h,
                                      unsigned int  row_stride,
                                      int          *alpha,
                                      int          *compress,
                                      int          *quality,
                                      int          *lossy);

/**
 * Write image data to the named key in an eet file using a cipher.
 * @param ef A valid eet file handle opened for writing.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param data A pointer to the image pixel data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return Success if the data was encoded and written or not.
 *
 * This function takes image pixel data and encodes it in an eet file
 * stored under the supplied name key, and returns how many bytes were
 * actually written to encode the image data.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns the number of bytes that were required
 * to encode the image data, or on failure it returns 0.
 *
 * @see eet_data_image_write()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_write_cipher(Eet_File    *ef,
                            const char  *name,
                            const char  *cipher_key,
                            const void  *data,
                            unsigned int w,
                            unsigned int h,
                            int          alpha,
                            int          compress,
                            int          quality,
                            int          lossy);

/**
 * Decode Image data header only to get information using a cipher.
 * @param data The encoded pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 on failure.
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1 indicating the header was read and
 * decoded properly, or 0 on failure.
 *
 * @see eet_data_image_header_decode()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_header_decode_cipher(const void   *data,
                                    const char   *cipher_key,
                                    int           size,
                                    unsigned int *w,
                                    unsigned int *h,
                                    int          *alpha,
                                    int          *compress,
                                    int          *quality,
                                    int          *lossy);

/**
 * Decode Image data into pixel data using a cipher.
 * @param data The encoded pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param w A pointer to the unsigned int to hold the width in pixels.
 * @param h A pointer to the unsigned int to hold the height in pixels.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return The image pixel data decoded
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (width, height etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns a pointer to the image data decoded. The
 * calling application is responsible for calling free() on the image data
 * when it is done with it. On failure NULL is returned and the parameter
 * values may not contain any sensible data.
 *
 * @see eet_data_image_decode()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI void *
eet_data_image_decode_cipher(const void   *data,
                             const char   *cipher_key,
                             int           size,
                             unsigned int *w,
                             unsigned int *h,
                             int          *alpha,
                             int          *compress,
                             int          *quality,
                             int          *lossy);

/**
 * Decode Image data into pixel data using a cipher.
 * @param data The encoded pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size The size, in bytes, of the encoded pixel data.
 * @param src_x The starting x coordinate from where to dump the stream.
 * @param src_y The starting y coordinate from where to dump the stream.
 * @param d A pointer to the pixel surface.
 * @param w The expected width in pixels of the pixel surface to decode.
 * @param h The expected height in pixels of the pixel surface to decode.
 * @param row_stride The length of a pixels line in the destination surface.
 * @param alpha A pointer to the int to hold the alpha flag.
 * @param compress A pointer to the int to hold the compression amount.
 * @param quality A pointer to the int to hold the quality amount.
 * @param lossy A pointer to the int to hold the lossiness flag.
 * @return 1 on success, 0 otherwise.
 *
 * This function takes encoded pixel data and decodes it into raw RGBA
 * pixels on success.
 *
 * The other parameters of the image (alpha, compress etc.) are placed into
 * the values pointed to (they must be supplied). The pixel data is a linear
 * array of pixels starting from the top-left of the image scanning row by
 * row from left to right. Each pixel is a 32bit value, with the high byte
 * being the alpha channel, the next being red, then green, and the low byte
 * being blue. The width and height are measured in pixels and will be
 * greater than 0 when returned. The alpha flag is either 0 or 1. 0 denotes
 * that the alpha channel is not used. 1 denotes that it is significant.
 * Compress is filled with the compression value/amount the image was
 * stored with. The quality value is filled with the quality encoding of
 * the image file (0 - 100). The lossy flags is either 0 or 1 as to if
 * the image was encoded lossily or not.
 *
 * On success the function returns 1, and 0 on failure. On failure the
 * parameter values may not contain any sensible data.
 *
 * @see eet_data_image_decode_to_surface()
 *
 * @since 1.0.2
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI int
eet_data_image_decode_to_surface_cipher(const void   *data,
                                        const char   *cipher_key,
                                        int           size,
                                        unsigned int  src_x,
                                        unsigned int  src_y,
                                        unsigned int *d,
                                        unsigned int  w,
                                        unsigned int  h,
                                        unsigned int  row_stride,
                                        int          *alpha,
                                        int          *compress,
                                        int          *quality,
                                        int          *lossy);

/**
 * Encode image data for storage or transmission using a cipher.
 * @param data A pointer to the image pixel data.
 * @param cipher_key The key to use as cipher.
 * @param size_ret A pointer to an int to hold the size of the returned data.
 * @param w The width of the image in pixels.
 * @param h The height of the image in pixels.
 * @param alpha The alpha channel flag.
 * @param compress The compression amount.
 * @param quality The quality encoding amount.
 * @param lossy The lossiness flag.
 * @return The encoded image data.
 *
 * This function stakes image pixel data and encodes it with compression and
 * possible loss of quality (as a trade off for size) for storage or
 * transmission to another system.
 *
 * The data expected is the same format as returned by eet_data_image_read.
 * If this is not the case weird things may happen. Width and height must
 * be between 1 and 8000 pixels. The alpha flags can be 0 or 1 (0 meaning
 * the alpha values are not useful and 1 meaning they are). Compress can
 * be from 0 to 9 (0 meaning no compression, 9 meaning full compression).
 * This is only used if the image is not lossily encoded. Quality is used on
 * lossy compression and should be a value from 0 to 100. The lossy flag
 * can be 0 or 1. 0 means encode losslessly and 1 means to encode with
 * image quality loss (but then have a much smaller encoding).
 *
 * On success this function returns a pointer to the encoded data that you
 * can free with free() when no longer needed.
 *
 * @see eet_data_image_encode()
 *
 * @since 1.0.0
 * @ingroup Eet_File_Image_Cipher_Group
 */
EAPI void *
eet_data_image_encode_cipher(const void   *data,
                             const char   *cipher_key,
                             unsigned int  w,
                             unsigned int  h,
                             int           alpha,
                             int           compress,
                             int           quality,
                             int           lossy,
                             int          *size_ret);

/**
 * @defgroup Eet_Cipher_Group Cipher, Identity and Protection Mechanisms
 *
 * Eet allows one to protect entries of an #Eet_File
 * individually. This may be used to ensure data was not tampered or
 * that third party does not read your data.
 *
 * @see @ref Eet_File_Cipher_Group
 * @see @ref Eet_File_Image_Cipher_Group
 *
 * @{
 */

/**
 * @typedef Eet_Key
 * Opaque handle that defines an identity (also known as key)
 * in Eet's cipher system.
 */
typedef struct _Eet_Key   Eet_Key;

/**
 * @}
 */

/**
 * Callback used to request if needed the password of a private key.
 *
 * @param buffer the buffer where to store the password.
 * @param size the maximum password size (size of buffer, including '@\0').
 * @param rwflag if the buffer is also readable or just writable.
 * @param data currently unused, may contain some context in future.
 * @return 1 on success and password was set to @p buffer, 0 on failure.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
typedef int (*Eet_Key_Password_Callback) (char *buffer, int size, int rwflag, void *data);

/**
 * Create an Eet_Key needed for signing an eet file.
 *
 * The certificate should provide the public that match the private key.
 * No verification is done to ensure that.
 *
 * @param certificate_file The file where to find the certificate.
 * @param private_key_file The file that contains the private key.
 * @param cb Function to callback if password is required to unlock
 *        private key.
 * @return A key handle to use, or @c NULL on failure.
 *
 * @see eet_identity_close()
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI Eet_Key *
eet_identity_open(const char                *certificate_file,
                  const char                *private_key_file,
                  Eet_Key_Password_Callback  cb);

/**
 * Close and release all ressource used by an Eet_Key.  An
 * reference counter prevent it from being freed until all file
 * using it are also closed.
 *
 * @param key the key handle to close and free resources.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI void
eet_identity_close(Eet_Key *key);

/**
 * Set a key to sign a file
 *
 * @param ef the file to set the identity.
 * @param key the key handle to set as identity.
 * @return #EET_ERROR_BAD_OBJECT if @p ef is invalid or
 *         #EET_ERROR_NONE on success.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI Eet_Error
eet_identity_set(Eet_File *ef,
                 Eet_Key  *key);

/**
 * Display both private and public key of an Eet_Key.
 *
 * @param key the handle to print.
 * @param out where to print.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI void
eet_identity_print(Eet_Key *key,
                   FILE    *out);

/**
 * Get the x509 der certificate associated with an Eet_File. Will return NULL
 * if the file is not signed.
 *
 * @param ef The file handle to query.
 * @param der_length The length of returned data, may be @c NULL.
 * @return the x509 certificate or @c NULL on error.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI const void *
eet_identity_x509(Eet_File *ef,
                  int      *der_length);

/**
 * Get the raw signature associated with an Eet_File. Will return NULL
 * if the file is not signed.
 *
 * @param ef The file handle to query.
 * @param signature_length The length of returned data, may be @c NULL.
 * @return the raw signature or @c NULL on error.
 *
 * @ingroup Eet_Cipher_Group
 */
EAPI const void *
eet_identity_signature(Eet_File *ef,
                       int      *signature_length);

/**
 * Get the SHA1 associated with a file. Could be the one used to
 * sign the data or if the data where not signed, it will be the
 * SHA1 of the file.
 *
 * @param ef The file handle to query.
 * @param sha1_length The length of returned data, may be @c NULL.
 * @return the associated SHA1 or @c NULL on error.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI const void *
eet_identity_sha1(Eet_File *ef,
                  int      *sha1_length);

/**
 * Display the x509 der certificate to out.
 *
 * @param certificate the x509 certificate to print
 * @param der_length The length the certificate.
 * @param out where to print.
 *
 * @since 1.2.0
 * @ingroup Eet_Cipher_Group
 */
EAPI void
eet_identity_certificate_print(const unsigned char *certificate,
                               int                  der_length,
                               FILE                *out);

/**
 * @defgroup Eet_Data_Group Eet Data Serialization
 *
 * Convenience functions to serialize and parse complex data
 * structures to binary blobs.
 *
 * While Eet core just handles binary blobs, it is often required
 * to save some structured data of different types, such as
 * strings, integers, lists, hashes and so on.
 *
 * Eet can serialize and then parse data types given some
 * construction instructions. These are defined in two levels:
 *
 * - #Eet_Data_Descriptor_Class to tell generic memory handling,
 *   such as the size of the type, how to allocate memory, strings,
 *   lists, hashes and so on.
 *
 * - #Eet_Data_Descriptor to tell inside such type, the members and
 *   their offsets inside the memory blob, their types and
 *   names. These members can be simple types or other
 *   #Eet_Data_Descriptor, allowing hierarchical types to be
 *   defined.
 *
 * Given that C provides no introspection, this process can be
 * quite cumbersome, so we provide lots of macros and convenience
 * functions to aid creating the types.
 *
 * Example:
 *
 * @code
 * #include <Eet.h>
 * #include <Evas.h>
 *
 * typedef struct _blah2
 * {
 *    char *string;
 * } Blah2;
 *
 * typedef struct _blah3
 * {
 *    char *string;
 * } Blah3;
 *
 * typedef struct _blah
 * {
 *    char character;
 *    short sixteen;
 *    int integer;
 *    long long lots;
 *    float floating;
 *    double floating_lots;
 *    char *string;
 *    Blah2 *blah2;
 *    Eina_List *blah3;
 * } Blah;
 *
 * int
 * main(int argc, char **argv)
 * {
 *    Blah blah;
 *    Blah2 blah2;
 *    Blah3 blah3;
 *    Eet_Data_Descriptor *edd, *edd2, *edd3;
 *    Eet_Data_Descriptor_Class eddc, eddc2, eddc3;
 *    void *data;
 *    int size;
 *    FILE *f;
 *    Blah *blah_in;
 *
 *    eet_init();
 *
 *    EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET(&eddc3, Blah3);
 *    edd3 = eet_data_descriptor_stream_new(&eddc3);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd3, Blah3, "string3", string, EET_T_STRING);
 *
 *    EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET(&eddc2, Blah2);
 *    edd2 = eet_data_descriptor_stream_new(&eddc2);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd2, Blah2, "string2", string, EET_T_STRING);
 *
 *    EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET(&eddc, Blah);
 *    edd = eet_data_descriptor_stream_new(&eddc);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "character", character, EET_T_CHAR);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "sixteen", sixteen, EET_T_SHORT);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "integer", integer, EET_T_INT);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "lots", lots, EET_T_LONG_LONG);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "floating", floating, EET_T_FLOAT);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "floating_lots", floating_lots, EET_T_DOUBLE);
 *    EET_DATA_DESCRIPTOR_ADD_BASIC(edd, Blah, "string", string, EET_T_STRING);
 *    EET_DATA_DESCRIPTOR_ADD_SUB(edd, Blah, "blah2", blah2, edd2);
 *    EET_DATA_DESCRIPTOR_ADD_LIST(edd, Blah, "blah3", blah3, edd3);
 *
 *    blah3.string = "PANTS";
 *
 *    blah2.string = "subtype string here!";
 *
 *    blah.character = '7';
 *    blah.sixteen = 0x7777;
 *    blah.integer = 0xc0def00d;
 *    blah.lots = 0xdeadbeef31337777;
 *    blah.floating = 3.141592654;
 *    blah.floating_lots = 0.777777777777777;
 *    blah.string = "bite me like a turnip";
 *    blah.blah2 = &blah2;
 *    blah.blah3 = eina_list_append(NULL, &blah3);
 *    blah.blah3 = eina_list_append(blah.blah3, &blah3);
 *    blah.blah3 = eina_list_append(blah.blah3, &blah3);
 *    blah.blah3 = eina_list_append(blah.blah3, &blah3);
 *    blah.blah3 = eina_list_append(blah.blah3, &blah3);
 *    blah.blah3 = eina_list_append(blah.blah3, &blah3);
 *    blah.blah3 = eina_list_append(blah.blah3, &blah3);
 *
 *    data = eet_data_descriptor_encode(edd, &blah, &size);
 *    printf("-----DECODING\n");
 *    blah_in = eet_data_descriptor_decode(edd, data, size);
 *
 *    printf("-----DECODED!\n");
 *    printf("%c\n", blah_in->character);
 *    printf("%x\n", (int)blah_in->sixteen);
 *    printf("%x\n", blah_in->integer);
 *    printf("%lx\n", blah_in->lots);
 *    printf("%f\n", (double)blah_in->floating);
 *    printf("%f\n", (double)blah_in->floating_lots);
 *    printf("%s\n", blah_in->string);
 *    printf("%p\n", blah_in->blah2);
 *    printf("  %s\n", blah_in->blah2->string);
 *      {
 *         Eina_List *l;
 *         Blah3 *blah3_in;
 *
 *         EINA_LIST_FOREACH(blah_in->blah3, l, blah3_in)
 *           {
 *              printf("%p\n", blah3_in);
 *              printf("  %s\n", blah3_in->string);
 *           }
 *      }
 *    eet_data_descriptor_free(edd);
 *    eet_data_descriptor_free(edd2);
 *    eet_data_descriptor_free(edd3);
 *
 *    eet_shutdown();
 *
 *   return 0;
 * }
 * @endcode
 *
 * @{
 */
#define EET_T_UNKNOW         0 /**< Unknown data encoding type */
#define EET_T_CHAR           1 /**< Data type: char */
#define EET_T_SHORT          2 /**< Data type: short */
#define EET_T_INT            3 /**< Data type: int */
#define EET_T_LONG_LONG      4 /**< Data type: long long */
#define EET_T_FLOAT          5 /**< Data type: float */
#define EET_T_DOUBLE         6 /**< Data type: double */
#define EET_T_UCHAR          7 /**< Data type: unsigned char */
#define EET_T_USHORT         8 /**< Data type: unsigned short */
#define EET_T_UINT           9 /**< Data type: unsigned int */
#define EET_T_ULONG_LONG     10 /**< Data type: unsigned long long */
#define EET_T_STRING         11 /**< Data type: char * */
#define EET_T_INLINED_STRING 12 /**< Data type: char * (but compressed inside the resulting eet) */
#define EET_T_NULL           13 /**< Data type: (void *) (only use it if you know why) */
#define EET_T_F32P32         14 /**< Data type: fixed point 32.32 */
#define EET_T_F16P16         15 /**< Data type: fixed point 16.16 */
#define EET_T_F8P24          16 /**< Data type: fixed point 8.24 */
#define EET_T_LAST           18 /**< Last data type */

#define EET_G_UNKNOWN        100 /**< Unknown group data encoding type */
#define EET_G_ARRAY          101 /**< Fixed size array group type */
#define EET_G_VAR_ARRAY      102 /**< Variable size array group type */
#define EET_G_LIST           103 /**< Linked list group type */
#define EET_G_HASH           104 /**< Hash table group type */
#define EET_G_UNION          105 /**< Union group type */
#define EET_G_VARIANT        106 /**< Selectable subtype group */
#define EET_G_LAST           107 /**< Last group type */

#define EET_I_LIMIT          128 /**< Other type exist but are reserved for internal purpose. */

/**
 * @typedef Eet_Data_Descriptor
 *
 * Opaque handle that have information on a type members.
 *
 * The members are added by means of
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB(),
 * EET_DATA_DESCRIPTOR_ADD_LIST(), EET_DATA_DESCRIPTOR_ADD_HASH()
 * or eet_data_descriptor_element_add().
 *
 * @see eet_data_descriptor_stream_new()
 * @see eet_data_descriptor_file_new()
 * @see eet_data_descriptor_free()
 */
typedef struct _Eet_Data_Descriptor         Eet_Data_Descriptor;

/**
 * @def EET_DATA_DESCRIPTOR_CLASS_VERSION
 * The version of #Eet_Data_Descriptor_Class at the time of the
 * distribution of the sources. One should define this to its
 * version member so it is compatible with abi changes, or at least
 * will not crash with them.
 */
#define EET_DATA_DESCRIPTOR_CLASS_VERSION 4

/**
 * @typedef Eet_Data_Descriptor_Class
 *
 * Instructs Eet about memory management for different needs under
 * serialization and parse process.
 */
typedef struct _Eet_Data_Descriptor_Class   Eet_Data_Descriptor_Class;

/**
 * @struct _Eet_Data_Descriptor_Class
 *
 * Instructs Eet about memory management for different needs under
 * serialization and parse process.
 *
 * If using Eina data types, it is advised to use the helpers
 * EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET() and
 * EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET().
 */
struct _Eet_Data_Descriptor_Class
{
   int         version;  /**< ABI version as #EET_DATA_DESCRIPTOR_CLASS_VERSION */
   const char *name;  /**< Name of data type to be serialized */
   int         size;  /**< Size in bytes of data type to be serialized */
   struct
   {
      void       *(*mem_alloc)(size_t size);  /**< how to allocate memory (usually malloc()) */
      void        (*mem_free)(void *mem);   /**< how to free memory (usually free()) */
      char       *(*str_alloc)(const char *str);   /**< how to allocate a string */
      void        (*str_free)(const char *str);   /**< how to free a string */
      void       *(*list_next)(void *l);   /**< how to iterate to the next element of a list. Receives and should return the list node. */
      void       *(*list_append)(void *l, void *d);    /**< how to append data @p d to list which head node is @p l */
      void       *(*list_data)(void *l);   /**< retrieves the data from node @p l */
      void       *(*list_free)(void *l);   /**< free all the nodes from the list which head node is @p l */
      void        (*hash_foreach)(void *h, int (*func)(void *h, const char *k, void *dt, void *fdt), void *fdt); /**< iterates over all elements in the hash @p h in no specific order */
      void       *(*hash_add)(void *h, const char *k, void *d);     /**< add a new data @p d as key @p k in hash @p h */
      void        (*hash_free)(void *h);   /**< free all entries from the hash @p h */
      char       *(*str_direct_alloc)(const char *str);   /**< how to allocate a string directly from file backed/mmaped region pointed by @p str */
      void        (*str_direct_free)(const char *str);   /**< how to free a string returned by str_direct_alloc */
      const char *(*type_get)(const void *data, Eina_Bool *unknow);    /**< convert any kind of data type to a name that define an Eet_Data_Element. */
      Eina_Bool   (*type_set)(const char *type, void *data, Eina_Bool unknow);    /**< set the type at a particular adress */
      void       *(*array_alloc)(size_t size); /**< how to allocate memory for array (usually malloc()) */
      void        (*array_free)(void *mem); /**< how to free memory for array (usually free()) */
   } func;
};

/**
 * @}
 */

/**
 * Create a new empty data structure descriptor.
 * @param name The string name of this data structure (most be a
 *        global constant and never change).
 * @param size The size of the struct (in bytes).
 * @param func_list_next The function to get the next list node.
 * @param func_list_append The function to append a member to a list.
 * @param func_list_data The function to get the data from a list node.
 * @param func_list_free The function to free an entire linked list.
 * @param func_hash_foreach The function to iterate through all
 *        hash table entries.
 * @param func_hash_add The function to add a member to a hash table.
 * @param func_hash_free The function to free an entire hash table.
 * @return A new empty data descriptor.
 *
 * This function creates a new data descriptore and returns a handle to the
 * new data descriptor. On creation it will be empty, containing no contents
 * describing anything other than the shell of the data structure.
 *
 * You add structure members to the data descriptor using the macros
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB() and
 * EET_DATA_DESCRIPTOR_ADD_LIST(), depending on what type of member you are
 * adding to the description.
 *
 * Once you have described all the members of a struct you want loaded, or
 * saved eet can load and save those members for you, encode them into
 * endian-independant serialised data chunks for transmission across a
 * a network or more.
 *
 * The function pointers to the list and hash table functions are only
 * needed if you use those data types, else you can pass NULL instead.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 *
 * @deprecated use eet_data_descriptor_stream_new() or
 *             eet_data_descriptor_file_new()
 */
EINA_DEPRECATED EAPI Eet_Data_Descriptor *
eet_data_descriptor_new(const char *name,
                        int size,
                        void *(*func_list_next)(void *l),
                        void *(*func_list_append)(void *l, void *d),
                        void *(*func_list_data)(void *l),
                        void *(*func_list_free)(void *l),
                        void (*func_hash_foreach)(void *h, int (*func)(void       *h,
                                                                       const char *k,
                                                                       void       *dt,
                                                                       void       *fdt), void *fdt),
                        void *(*func_hash_add)(void *h, const char *k, void *d),
                        void (*func_hash_free)(void *h));
/*
 * FIXME:
 *
 * moving to this api from the old above. this will break things when the
 * move happens - but be warned
 */
EINA_DEPRECATED EAPI Eet_Data_Descriptor *
eet_data_descriptor2_new(const Eet_Data_Descriptor_Class *eddc);
EINA_DEPRECATED EAPI Eet_Data_Descriptor *
eet_data_descriptor3_new(const Eet_Data_Descriptor_Class *eddc);

/**
 * This function creates a new data descriptore and returns a handle to the
 * new data descriptor. On creation it will be empty, containing no contents
 * describing anything other than the shell of the data structure.
 * @param eddc The data descriptor to free.
 *
 * You add structure members to the data descriptor using the macros
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB() and
 * EET_DATA_DESCRIPTOR_ADD_LIST(), depending on what type of member you are
 * adding to the description.
 *
 * Once you have described all the members of a struct you want loaded, or
 * saved eet can load and save those members for you, encode them into
 * endian-independant serialised data chunks for transmission across a
 * a network or more.
 *
 * This function specially ignore str_direct_alloc and str_direct_free. It
 * is usefull when the eet_data you are reading don't have a dictionnary
 * like network stream or ipc. It also mean that all string will be allocated
 * and duplicated in memory.
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eet_Data_Descriptor *
eet_data_descriptor_stream_new(const Eet_Data_Descriptor_Class *eddc);

/**
 * This function creates a new data descriptore and returns a handle to the
 * new data descriptor. On creation it will be empty, containing no contents
 * describing anything other than the shell of the data structure.
 * @param eddc The data descriptor to free.
 *
 * You add structure members to the data descriptor using the macros
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), EET_DATA_DESCRIPTOR_ADD_SUB() and
 * EET_DATA_DESCRIPTOR_ADD_LIST(), depending on what type of member you are
 * adding to the description.
 *
 * Once you have described all the members of a struct you want loaded, or
 * saved eet can load and save those members for you, encode them into
 * endian-independant serialised data chunks for transmission across a
 * a network or more.
 *
 * This function use str_direct_alloc and str_direct_free. It is
 * usefull when the eet_data you are reading come from a file and
 * have a dictionnary. This will reduce memory use, improve the
 * possibility for the OS to page this string out. But be carrefull
 * all EET_T_STRING are pointer to a mmapped area and it will point
 * to nowhere if you close the file. So as long as you use this
 * strings, you need to have the Eet_File open.
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eet_Data_Descriptor *
eet_data_descriptor_file_new(const Eet_Data_Descriptor_Class *eddc);

/**
 * This function is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with a stream.
 * @param eddc The Eet_Data_Descriptor_Class you want to set.
 * @param name The name of the structure described by this class.
 * @param size The size of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eina_Bool
eet_eina_stream_data_descriptor_class_set(Eet_Data_Descriptor_Class *eddc,
                                          unsigned int               eddc_size,
                                          const char                *name,
                                          int                        size);

/**
 * This macro is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with stream.
 * @param Clas The Eet_Data_Descriptor_Class you want to set.
 * @param Type The type of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
#define EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET(clas, type)\
   (eet_eina_stream_data_descriptor_class_set(clas, sizeof (*(clas)), # type, sizeof(type)))

/**
 * This function is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with a file.
 * @param eddc The Eet_Data_Descriptor_Class you want to set.
 * @param name The name of the structure described by this class.
 * @param size The size of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
EAPI Eina_Bool
eet_eina_file_data_descriptor_class_set(Eet_Data_Descriptor_Class *eddc,
                                        unsigned int               eddc_size,
                                        const char                *name,
                                        int                        size);

/**
 * This macro is an helper that set all the parameter of an
 * Eet_Data_Descriptor_Class correctly when you use Eina data type
 * with file.
 * @param Clas The Eet_Data_Descriptor_Class you want to set.
 * @param Type The type of the structure described by this class.
 * @return EINA_TRUE if the structure was correctly set (The only
 *         reason that could make it fail is if you did give wrong
 *         parameter).
 *
 * @since 1.2.3
 * @ingroup Eet_Data_Group
 */
#define EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET(clas, type)\
  (eet_eina_file_data_descriptor_class_set(clas, sizeof (*(clas)), # type, sizeof(type)))

/**
 * This function frees a data descriptor when it is not needed anymore.
 * @param edd The data descriptor to free.
 *
 * This function takes a data descriptor handle as a parameter and frees all
 * data allocated for the data descriptor and the handle itself. After this
 * call the descriptor is no longer valid.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void
eet_data_descriptor_free(Eet_Data_Descriptor *edd);

/**
 * This function is an internal used by macros.
 *
 * This function is used by macros EET_DATA_DESCRIPTOR_ADD_BASIC(),
 * EET_DATA_DESCRIPTOR_ADD_SUB() and EET_DATA_DESCRIPTOR_ADD_LIST(). It is
 * complex to use by hand and should be left to be used by the macros, and
 * thus is not documented.
 *
 * @param edd The data descriptor handle to add element (member).
 * @param name The name of element to be serialized.
 * @param type The type of element to be serialized, like
 *        #EET_T_INT. If #EET_T_UNKNOW, then it is considered to be a
 *        group, list or hash.
 * @param group_type If element type is #EET_T_UNKNOW, then the @p
 *        group_type will speficy if it is a list (#EET_G_LIST),
 *        array (#EET_G_ARRAY) and so on. If #EET_G_UNKNOWN, then
 *        the member is a subtype (pointer to another type defined by
 *        another #Eet_Data_Descriptor).
 * @param offset byte offset inside the source memory to be serialized.
 * @param count number of elements (if #EET_G_ARRAY or #EET_G_VAR_ARRAY).
 * @param counter_name variable that defines the name of number of elements.
 * @param subtype If contains a subtype, then its data descriptor.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void
eet_data_descriptor_element_add(Eet_Data_Descriptor *edd,
                                const char          *name,
                                int                  type,
                                int                  group_type,
                                int                  offset,
                                /* int                  count_offset, */
                                int                  count,
                                const char          *counter_name,
                                Eet_Data_Descriptor *subtype);

/**
 * Read a data structure from an eet file and decodes it.
 * @param ef The eet file handle to read from.
 * @param edd The data descriptor handle to use when decoding.
 * @param name The key the data is stored under in the eet file.
 * @return A pointer to the decoded data structure.
 *
 * This function decodes a data structure stored in an eet file, returning
 * a pointer to it if it decoded successfully, or NULL on failure. This
 * can save a programmer dozens of hours of work in writing configuration
 * file parsing and writing code, as eet does all that work for the program
 * and presents a program-friendly data structure, just as the programmer
 * likes. Eet can handle members being added or deleted from the data in
 * storage and safely zero-fills unfilled members if they were not found
 * in the data. It checks sizes and headers whenever it reads data, allowing
 * the programmer to not worry about corrupt data.
 *
 * Once a data structure has been described by the programmer with the
 * fields they wish to save or load, storing or retrieving a data structure
 * from an eet file, or from a chunk of memory is as simple as a single
 * function call.
 *
 * @see eet_data_read_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_read(Eet_File            *ef,
              Eet_Data_Descriptor *edd,
              const char          *name);

/**
 * Write a data structure from memory and store in an eet file.
 * @param ef The eet file handle to write to.
 * @param edd The data descriptor to use when encoding.
 * @param name The key to store the data under in the eet file.
 * @param data A pointer to the data structure to ssave and encode.
 * @param compress Compression flags for storage.
 * @return bytes written on successful write, 0 on failure.
 *
 * This function is the reverse of eet_data_read(), saving a data structure
 * to an eet file.
 *
 * @see eet_data_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_write(Eet_File            *ef,
               Eet_Data_Descriptor *edd,
               const char          *name,
               const void          *data,
               int                  compress);

/**
 * Dump an eet encoded data structure into ascii text
 * @param data_in The pointer to the data to decode into a struct.
 * @param size_in The size of the data pointed to in bytes.
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take a chunk of data encoded by
 * eet_data_descriptor_encode() and convert it into human readable
 * ascii text.  It does this by calling the @p dumpfunc callback
 * for all new text that is generated. This callback should append
 * to any existing text buffer and will be passed the pointer @p
 * dumpdata as a parameter as well as a string with new text to be
 * appended.
 *
 * Example:
 *
 * @code
 * void output(void *data, const char *string)
 * {
 *   printf("%s", string);
 * }
 *
 * void dump(const char *file)
 * {
 *   FILE *f;
 *   int len;
 *   void *data;
 *
 *   f = fopen(file, "r");
 *   fseek(f, 0, SEEK_END);
 *   len = ftell(f);
 *   rewind(f);
 *   data = malloc(len);
 *   fread(data, len, 1, f);
 *   fclose(f);
 *   eet_data_text_dump(data, len, output, NULL);
 * }
 * @endcode
 *
 * @see eet_data_text_dump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_text_dump(const void  *data_in,
                   int          size_in,
                   void       (*dumpfunc)(void *data, const char *str),
                   void        *dumpdata);

/**
 * Take an ascii encoding from eet_data_text_dump() and re-encode in binary.
 * @param text The pointer to the string data to parse and encode.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param size_ret This gets filled in with the encoded data blob
 *        size in bytes.
 * @return The encoded data on success, NULL on failure.
 *
 * This function will parse the string pointed to by @p text and return
 * an encoded data lump the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob. @p text is a normal
 * C string.
 *
 * @see eet_data_text_undump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_text_undump(const char *text,
                     int         textlen,
                     int        *size_ret);

/**
 * Dump an eet encoded data structure from an eet file into ascii text
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take an open and valid eet file from
 * eet_open() request the data encoded by
 * eet_data_descriptor_encode() corresponding to the key @p name
 * and convert it into human readable ascii text. It does this by
 * calling the @p dumpfunc callback for all new text that is
 * generated. This callback should append to any existing text
 * buffer and will be passed the pointer @p dumpdata as a parameter
 * as well as a string with new text to be appended.
 *
 * @see eet_data_dump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_dump(Eet_File    *ef,
              const char  *name,
              void       (*dumpfunc)(void *data, const char *str),
              void        *dumpdata);

/**
 * Take an ascii encoding from eet_data_dump() and re-encode in binary.
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param text The pointer to the string data to parse and encode.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return 1 on success, 0 on failure
 *
 * This function will parse the string pointed to by @p text,
 * encode it the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob.
 *
 * The data (optionally compressed) will be in ram, pending a flush to
 * disk (it will stay in ram till the eet file handle is closed though).
 *
 * @see eet_data_undump_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI int
eet_data_undump(Eet_File   *ef,
                const char *name,
                const char *text,
                int         textlen,
                int         compress);

/**
 * Decode a data structure from an arbitary location in memory.
 * @param edd The data  descriptor to use when decoding.
 * @param data_in The pointer to the data to decode into a struct.
 * @param size_in The size of the data pointed to in bytes.
 * @return NULL on failure, or a valid decoded struct pointer on success.
 *
 * This function will decode a data structure that has been encoded using
 * eet_data_descriptor_encode(), and return a data structure with all its
 * elements filled out, if successful, or NULL on failure.
 *
 * The data to be decoded is stored at the memory pointed to by @p data_in,
 * and is described by the descriptor pointed to by @p edd. The data size is
 * passed in as the value to @p size_in, ande must be greater than 0 to
 * succeed.
 *
 * This function is useful for decoding data structures delivered to the
 * application by means other than an eet file, such as an IPC or socket
 * connection, raw files, shared memory etc.
 *
 * Please see eet_data_read() for more information.
 *
 * @see eet_data_descriptor_decode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_descriptor_decode(Eet_Data_Descriptor *edd,
                           const void          *data_in,
                           int                  size_in);

/**
 * Encode a dsata struct to memory and return that encoded data.
 * @param edd The data  descriptor to use when encoding.
 * @param data_in The pointer to the struct to encode into data.
 * @param size_ret pointer to the an int to be filled with the decoded size.
 * @return NULL on failure, or a valid encoded data chunk on success.
 *
 * This function takes a data structutre in memory and encodes it into a
 * serialised chunk of data that can be decoded again by
 * eet_data_descriptor_decode(). This is useful for being able to transmit
 * data structures across sockets, pipes, IPC or shared file mechanisms,
 * without having to worry about memory space, machine type, endianess etc.
 *
 * The parameter @p edd must point to a valid data descriptor, and
 * @p data_in must point to the right data structure to encode. If not, the
 * encoding may fail.
 *
 * On success a non NULL valid pointer is returned and what @p size_ret
 * points to is set to the size of this decoded data, in bytes. When the
 * encoded data is no longer needed, call free() on it. On failure NULL is
 * returned and what @p size_ret points to is set to 0.
 *
 * Please see eet_data_write() for more information.
 *
 * @see eet_data_descriptor_encode_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
EAPI void *
eet_data_descriptor_encode(Eet_Data_Descriptor *edd,
                           const void          *data_in,
                           int                 *size_ret);

/**
 * Add a basic data element to a data descriptor.
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type The type of the member to encode.
 *
 * This macro is a convenience macro provided to add a member to
 * the data descriptor @p edd. The type of the structure is
 * provided as the @p struct_type parameter (for example: struct
 * my_struct). The @p name parameter defines a string that will be
 * used to uniquely name that member of the struct (it is suggested
 * to use the struct member itself).  The @p member parameter is
 * the actual struct member itself (for eet_dictionary_string_check
 * example: values), and @p type is the basic data type of the
 * member which must be one of: EET_T_CHAR, EET_T_SHORT, EET_T_INT,
 * EET_T_LONG_LONG, EET_T_FLOAT, EET_T_DOUBLE, EET_T_UCHAR,
 * EET_T_USHORT, EET_T_UINT, EET_T_ULONG_LONG or EET_T_STRING.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_BASIC(edd, struct_type, name, member, type) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, type, EET_G_UNKNOWN, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      0, /* 0,  */ NULL, NULL); \
   } while(0)

/**
 * Add a sub-element type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of sub-type struct to add.
 *
 * This macro lets you easily add a sub-type (a struct that's pointed to
 * by this one). All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), with the @p subtype being the exception.
 * This must be the data descriptor of the struct that is pointed to by
 * this element.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_SUB(edd, struct_type, name, member, subtype) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_UNKNOWN, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      0, /* 0,  */ NULL, subtype); \
   } while (0)

/**
 * Add a linked list type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of linked list member to add.
 *
 * This macro lets you easily add a linked list of other data types. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC(), with the
 * @p subtype being the exception. This must be the data descriptor of the
 * element that is in each member of the linked list to be stored.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_LIST(edd, struct_type, name, member, subtype) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_LIST, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      0, /* 0,  */ NULL, subtype); \
   } while (0)

/**
 * Add a hash type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of hash member to add.
 *
 * This macro lets you easily add a hash of other data types. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC(), with the
 * @p subtype being the exception. This must be the data descriptor of the
 * element that is in each member of the hash to be stored.
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_HASH(edd, struct_type, name, member, subtype) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_HASH, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      0, /* 0,  */ NULL, subtype); \
   } while (0)

/**
 * Add a hash of string to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 *
 * This macro lets you easily add a hash of string. All the
 * parameters are the same as for EET_DATA_DESCRIPTOR_ADD_BASIC().
 *
 * @since 1.3.4
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_HASH_STRING(edd, struct_type, name, member) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_STRING, EET_G_HASH, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      0, /* 0,  */ NULL, NULL); \
   } while (0)

/**
 * Add a fixed size array type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of hash member to add.
 *
 * This macro lets you easily add a fixed size array of other data
 * types. All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), with the @p subtype being the
 * exception. This must be the data descriptor of the element that
 * is in each member of the hash to be stored.
 *
 * @since 1.0.2
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_ARRAY(edd, struct_type, name, member, subtype) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_ARRAY, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      /* 0,  */ sizeof(___ett.member) / \
                                      sizeof(___ett.member[0]), NULL, subtype); \
   } while (0)

/**
 * Add a variable size array type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param subtype The type of hash member to add.
 *
 * This macro lets you easily add a fixed size array of other data
 * types. All the parameters are the same as for
 * EET_DATA_DESCRIPTOR_ADD_BASIC(), with the @p subtype being the
 * exception. This must be the data descriptor of the element that
 * is in each member of the hash to be stored.
 *
 * @since 1.0.2
 * @ingroup Eet_Data_Group
 */
#define EET_DATA_DESCRIPTOR_ADD_VAR_ARRAY(edd, struct_type, name, member, subtype) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, \
                                      name, \
                                      EET_T_UNKNOW, \
                                      EET_G_VAR_ARRAY, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      (char *)(& (___ett.member ## _count)) - \
                                      (char *)(& (___ett)), \
                                      /* 0,  */ NULL, \
                                      subtype); \
   } while (0)

/**
 * Add an union type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type_member The member that give hints on what is in the union.
 * @param unified_type Describe all possible type the union could handle.
 *
 * This macro lets you easily add an union with a member that specify what is inside.
 * The @p unified_type is an Eet_Data_Descriptor, but only the entry that match the name
 * returned by type_get will be used for each serialized data. The type_get and type_set
 * callback of unified_type should be defined.
 *
 * @since 1.2.4
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_UNION(edd, struct_type, name, member, type_member, unified_type) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_UNION, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      (char *)(& (___ett.type_member)) - \
                                      (char *)(& (___ett)), \
                                      NULL, unified_type); \
   } while (0)
   
/**
 * Add a automatically selectable type to a data descriptor
 * @param edd The data descriptor to add the type to.
 * @param struct_type The type of the struct.
 * @param name The string name to use to encode/decode this member
 *        (must be a constant global and never change).
 * @param member The struct member itself to be encoded.
 * @param type_member The member that give hints on what is in the union.
 * @param unified_type Describe all possible type the union could handle.
 *
 * This macro lets you easily define what the content of @p member points to depending of
 * the content of @p type_member. The type_get and type_set callback of unified_type should
 * be defined. If the the type is not know at the time of restoring it, eet will still call
 * type_set of @p unified_type but the pointer will be set to a serialized binary representation
 * of what eet know. This make it possible, to save this pointer again by just returning the string
 * given previously and telling it by setting unknow to EINA_TRUE.
 *
 * @since 1.2.4
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_VARIANT(edd, struct_type, name, member, type_member, unified_type) \
   do { \
      struct_type ___ett; \
      eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_VARIANT, \
                                      (char *)(& (___ett.member)) - \
                                      (char *)(& (___ett)), \
                                      (char *)(& (___ett.type_member)) - \
                                      (char *)(& (___ett)), \
                                      NULL, unified_type); \
   } while (0)
   
/**
 * Add a mapping to a data descriptor that will be used by union, variant or inherited type
 * @param unified_type The data descriptor to add the mapping to.
 * @param name The string name to get/set type.
 * @param subtype The matching data descriptor.
 *
 * @since 1.2.4
 * @ingroup Eet_Data_Group
 * @see Eet_Data_Descriptor_Class
 */
#define EET_DATA_DESCRIPTOR_ADD_MAPPING(unified_type, name, subtype) \
   eet_data_descriptor_element_add(unified_type, \
                                   name, \
                                   EET_T_UNKNOW, \
                                   EET_G_UNKNOWN, \
                                   0, \
                                   0, \
                                   NULL, \
                                   subtype)

/**
 * @defgroup Eet_Data_Cipher_Group Eet Data Serialization using A Ciphers
 *
 * Most of the @ref Eet_Data_Group have alternative versions that
 * accounts for ciphers to protect their content.
 *
 * @see @ref Eet_Cipher_Group
 *
 * @ingroup Eet_Data_Group
 */

/**
 * Read a data structure from an eet file and decodes it using a cipher.
 * @param ef The eet file handle to read from.
 * @param edd The data descriptor handle to use when decoding.
 * @param name The key the data is stored under in the eet file.
 * @param cipher_key The key to use as cipher.
 * @return A pointer to the decoded data structure.
 *
 * This function decodes a data structure stored in an eet file, returning
 * a pointer to it if it decoded successfully, or NULL on failure. This
 * can save a programmer dozens of hours of work in writing configuration
 * file parsing and writing code, as eet does all that work for the program
 * and presents a program-friendly data structure, just as the programmer
 * likes. Eet can handle members being added or deleted from the data in
 * storage and safely zero-fills unfilled members if they were not found
 * in the data. It checks sizes and headers whenever it reads data, allowing
 * the programmer to not worry about corrupt data.
 *
 * Once a data structure has been described by the programmer with the
 * fields they wish to save or load, storing or retrieving a data structure
 * from an eet file, or from a chunk of memory is as simple as a single
 * function call.
 *
 * @see eet_data_read()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_read_cipher(Eet_File            *ef,
                     Eet_Data_Descriptor *edd,
                     const char          *name,
                     const char          *cipher_key);

/**
 * Write a data structure from memory and store in an eet file
 * using a cipher.
 * @param ef The eet file handle to write to.
 * @param edd The data descriptor to use when encoding.
 * @param name The key to store the data under in the eet file.
 * @param cipher_key The key to use as cipher.
 * @param data A pointer to the data structure to ssave and encode.
 * @param compress Compression flags for storage.
 * @return bytes written on successful write, 0 on failure.
 *
 * This function is the reverse of eet_data_read(), saving a data structure
 * to an eet file.
 *
 * @see eet_data_write_cipher()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_write_cipher(Eet_File            *ef,
                      Eet_Data_Descriptor *edd,
                      const char          *name,
                      const char          *cipher_key,
                      const void          *data,
                      int                  compress);

/**
 * Dump an eet encoded data structure into ascii text using a cipher.
 * @param data_in The pointer to the data to decode into a struct.
 * @param cipher_key The key to use as cipher.
 * @param size_in The size of the data pointed to in bytes.
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take a chunk of data encoded by
 * eet_data_descriptor_encode() and convert it into human readable
 * ascii text.  It does this by calling the @p dumpfunc callback
 * for all new text that is generated. This callback should append
 * to any existing text buffer and will be passed the pointer @p
 * dumpdata as a parameter as well as a string with new text to be
 * appended.
 *
 * Example:
 *
 * @code
 * void output(void *data, const char *string)
 * {
 *   printf("%s", string);
 * }
 *
 * void dump(const char *file)
 * {
 *   FILE *f;
 *   int len;
 *   void *data;
 *
 *   f = fopen(file, "r");
 *   fseek(f, 0, SEEK_END);
 *   len = ftell(f);
 *   rewind(f);
 *   data = malloc(len);
 *   fread(data, len, 1, f);
 *   fclose(f);
 *   eet_data_text_dump_cipher(data, cipher_key, len, output, NULL);
 * }
 * @endcode
 *
 * @see eet_data_text_dump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_text_dump_cipher(const void *data_in,
                          const char *cipher_key,
                          int size_in,
                          void (*dumpfunc)(void *data, const char *str),
                          void *dumpdata);

/**
 * Take an ascii encoding from eet_data_text_dump() and re-encode
 * in binary using a cipher.
 * @param text The pointer to the string data to parse and encode.
 * @param cipher_key The key to use as cipher.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param size_ret This gets filled in with the encoded data blob
 *        size in bytes.
 * @return The encoded data on success, NULL on failure.
 *
 * This function will parse the string pointed to by @p text and return
 * an encoded data lump the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob. @p text is a normal
 * C string.
 *
 * @see eet_data_text_undump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_text_undump_cipher(const char *text,
                            const char *cipher_key,
                            int         textlen,
                            int        *size_ret);

/**
 * Dump an eet encoded data structure from an eet file into ascii
 * text using a cipher.
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param dumpfunc The function to call passed a string when new
 *        data is converted to text
 * @param dumpdata The data to pass to the @p dumpfunc callback.
 * @return 1 on success, 0 on failure
 *
 * This function will take an open and valid eet file from
 * eet_open() request the data encoded by
 * eet_data_descriptor_encode() corresponding to the key @p name
 * and convert it into human readable ascii text. It does this by
 * calling the @p dumpfunc callback for all new text that is
 * generated. This callback should append to any existing text
 * buffer and will be passed the pointer @p dumpdata as a parameter
 * as well as a string with new text to be appended.
 *
 * @see eet_data_dump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_dump_cipher(Eet_File    *ef,
                     const char  *name,
                     const char  *cipher_key,
                     void       (*dumpfunc)(void *data, const char *str),
                     void        *dumpdata);

/**
 * Take an ascii encoding from eet_data_dump() and re-encode in
 * binary using a cipher.
 * @param ef A valid eet file handle.
 * @param name Name of the entry. eg: "/base/file_i_want".
 * @param cipher_key The key to use as cipher.
 * @param text The pointer to the string data to parse and encode.
 * @param textlen The size of the string in bytes (not including 0
 *        byte terminator).
 * @param compress Compression flags (1 == compress, 0 = don't compress).
 * @return 1 on success, 0 on failure
 *
 * This function will parse the string pointed to by @p text,
 * encode it the same way eet_data_descriptor_encode() takes an
 * in-memory data struct and encodes into a binary blob.
 *
 * The data (optionally compressed) will be in ram, pending a flush to
 * disk (it will stay in ram till the eet file handle is closed though).
 *
 * @see eet_data_undump()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI int
eet_data_undump_cipher(Eet_File   *ef,
                       const char *name,
                       const char *cipher_key,
                       const char *text,
                       int         textlen,
                       int         compress);

/**
 * Decode a data structure from an arbitary location in memory
 * using a cipher.
 * @param edd The data  descriptor to use when decoding.
 * @param data_in The pointer to the data to decode into a struct.
 * @param cipher_key The key to use as cipher.
 * @param size_in The size of the data pointed to in bytes.
 * @return NULL on failure, or a valid decoded struct pointer on success.
 *
 * This function will decode a data structure that has been encoded using
 * eet_data_descriptor_encode(), and return a data structure with all its
 * elements filled out, if successful, or NULL on failure.
 *
 * The data to be decoded is stored at the memory pointed to by @p data_in,
 * and is described by the descriptor pointed to by @p edd. The data size is
 * passed in as the value to @p size_in, ande must be greater than 0 to
 * succeed.
 *
 * This function is useful for decoding data structures delivered to the
 * application by means other than an eet file, such as an IPC or socket
 * connection, raw files, shared memory etc.
 *
 * Please see eet_data_read() for more information.
 *
 * @see eet_data_descriptor_decode()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_descriptor_decode_cipher(Eet_Data_Descriptor *edd,
                                  const void          *data_in,
                                  const char          *cipher_key,
                                  int                  size_in);

/**
 * Encode a data struct to memory and return that encoded data
 * using a cipher.
 * @param edd The data  descriptor to use when encoding.
 * @param data_in The pointer to the struct to encode into data.
 * @param cipher_key The key to use as cipher.
 * @param size_ret pointer to the an int to be filled with the decoded size.
 * @return NULL on failure, or a valid encoded data chunk on success.
 *
 * This function takes a data structutre in memory and encodes it into a
 * serialised chunk of data that can be decoded again by
 * eet_data_descriptor_decode(). This is useful for being able to transmit
 * data structures across sockets, pipes, IPC or shared file mechanisms,
 * without having to worry about memory space, machine type, endianess etc.
 *
 * The parameter @p edd must point to a valid data descriptor, and
 * @p data_in must point to the right data structure to encode. If not, the
 * encoding may fail.
 *
 * On success a non NULL valid pointer is returned and what @p size_ret
 * points to is set to the size of this decoded data, in bytes. When the
 * encoded data is no longer needed, call free() on it. On failure NULL is
 * returned and what @p size_ret points to is set to 0.
 *
 * Please see eet_data_write() for more information.
 *
 * @see eet_data_descriptor_encode()
 *
 * @since 1.0.0
 * @ingroup Eet_Data_Cipher_Group
 */
EAPI void *
eet_data_descriptor_encode_cipher(Eet_Data_Descriptor *edd,
                                  const void          *data_in,
                                  const char          *cipher_key,
                                  int                 *size_ret);

/**
 * @defgroup Eet_Node_Group Low-level Serialization Structures.
 *
 * Functions that create, destroy and manipulate serialization nodes
 * used by @ref Eet_Data_Group.
 *
 * @{
 */

/**
 * @typedef Eet_Node
 * Opaque handle to manage serialization node.
 */
typedef struct _Eet_Node        Eet_Node;

/**
 * @typedef Eet_Node_Data
 * Contains an union that can fit any kind of node.
 */
typedef struct _Eet_Node_Data   Eet_Node_Data;

/**
 * @struct _Eet_Node_Data
 * Contains an union that can fit any kind of node.
 */
struct _Eet_Node_Data
{
   union {
      char                c;
      short               s;
      int                 i;
      long long           l;
      float               f;
      double              d;
      unsigned char       uc;
      unsigned short      us;
      unsigned int        ui;
      unsigned long long  ul;
      const char         *str;
   } value;
};

/**
 * @}
 */

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
 eet_node_char_new(const char *name,
                   char        c);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_short_new(const char *name,
                   short       s);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_int_new(const char *name,
                 int         i);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_long_long_new(const char *name,
                       long long   l);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_float_new(const char *name,
                   float       f);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_double_new(const char *name,
                    double      d);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_char_new(const char    *name,
                           unsigned char  uc);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_short_new(const char     *name,
                            unsigned short  us);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_int_new(const char   *name,
                          unsigned int  ui);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_unsigned_long_long_new(const char         *name,
                                unsigned long long  l);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_string_new(const char *name,
                    const char *str);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_inlined_string_new(const char *name,
                            const char *str);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_null_new(const char *name);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_list_new(const char *name,
                  Eina_List  *nodes);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_array_new(const char *name,
                   int         count,
                   Eina_List  *nodes);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_var_array_new(const char *name,
                       Eina_List  *nodes);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_hash_new(const char *name,
                  const char *key,
                  Eet_Node   *node);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_struct_new(const char *name,
                    Eina_List  *nodes);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_node_struct_child_new(const char *parent,
                          Eet_Node   *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_list_append(Eet_Node   *parent,
                     const char *name,
                     Eet_Node   *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_struct_append(Eet_Node   *parent,
                       const char *name,
                       Eet_Node   *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_hash_add(Eet_Node   *parent,
                  const char *name,
                  const char *key,
                  Eet_Node   *child);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_dump(Eet_Node  *n,
              int        dumplevel,
              void     (*dumpfunc)(void *data, const char *str),
              void      *dumpdata);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void
eet_node_del(Eet_Node *n);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI void *
eet_data_node_encode_cipher(Eet_Node   *node,
                            const char *cipher_key,
                            int        *size_ret);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_data_node_decode_cipher(const void *data_in,
                            const char *cipher_key,
                            int         size_in);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI Eet_Node *
eet_data_node_read_cipher(Eet_File   *ef,
                          const char *name,
                          const char *cipher_key);

/**
 * TODO FIX ME
 * @ingroup Eet_Node_Group
 */
EAPI int
eet_data_node_write_cipher(Eet_File   *ef,
                           const char *name,
                           const char *cipher_key,
                           Eet_Node   *node,
                           int         compress);

/* EXPERIMENTAL: THIS API MAY CHANGE IN THE FUTURE, USE IT ONLY IF YOU KNOW WHAT YOU ARE DOING. */

/**
 * @typedef Eet_Node_Walk
 * Describes how to walk trees of #Eet_Node.
 */
typedef struct _Eet_Node_Walk   Eet_Node_Walk;

/**
 * @struct _Eet_Node_Walk
 * Describes how to walk trees of #Eet_Node.
 */
struct _Eet_Node_Walk
{
   void *(*struct_alloc) (const char *type, void *user_data);
   void  (*struct_add) (void *parent, const char *name, void *child, void *user_data);
   void *(*array) (Eina_Bool variable, const char *name, int count, void *user_data);
   void  (*insert) (void *array, int index, void *child, void *user_data);
   void *(*list) (const char *name, void *user_data);
   void  (*append) (void *list, void *child, void *user_data);
   void *(*hash) (void *parent, const char *name, const char *key, void *value, void *user_data);
   void *(*simple) (int type, Eet_Node_Data *data, void *user_data);
};

EAPI void *
eet_node_walk(void          *parent,
              const char    *name,
              Eet_Node      *root,
              Eet_Node_Walk *cb,
              void          *user_data);

/*******/

/**
 * @defgroup Eet_Connection_Group Helper function to use eet over a network link
 *
 * Function that reconstruct and prepare packet of @ref Eet_Data_Group to be send.
 *
 */

/**
 * @typedef Eet_Connection
 * Opaque handle to track paquet for a specific connection.
 *
 * @ingroup Eet_Connection_Group
 */
typedef struct _Eet_Connection   Eet_Connection;

/**
 * @typedef Eet_Read_Cb
 * Called back when an @ref Eet_Data_Group has been received completly and could be used.
 *
 * @ingroup Eet_Connection_Group
 */
typedef Eina_Bool Eet_Read_Cb (const void *eet_data, size_t size, void *user_data);

/**
 * @typedef Eet_Write_Cb
 * Called back when a packet containing @ref Eet_Data_Group data is ready to be send.
 *
 * @ingroup Eet_Connection_Group
 */
typedef Eina_Bool Eet_Write_Cb (const void *data, size_t size, void *user_data);

/**
 * Instanciate a new connection to track.
 * @oaram eet_read_cb Function to call when one Eet_Data packet has been fully assemble.
 * @param eet_write_cb Function to call when one Eet_Data packet is ready to be send over the wire.
 * @param user_data Pointer provided to both functions to be used as a context handler.
 * @return NULL on failure, or a valid Eet_Connection handler.
 *
 * For every connection to track you will need a separate Eet_Connection provider.
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI Eet_Connection *
eet_connection_new(Eet_Read_Cb  *eet_read_cb,
                   Eet_Write_Cb *eet_write_cb,
                   const void   *user_data);

/**
 * Process a raw packet received over the link
 * @oaram conn Connection handler to track.
 * @param data Raw data packet.
 * @param size The size of that packet.
 * @return 0 on complete success, any other value indicate where in the stream it got wrong (It could be before that packet).
 *
 * Every time you receive a packet related to your connection, you should pass
 * it to that function so that it could process and assemble packet has you
 * receive it. It will automatically call Eet_Read_Cb when one is fully received.
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI int
eet_connection_received(Eet_Connection *conn,
                        const void     *data,
                        size_t          size);

/**
 * Convert a complex structure and prepare it to be send.
 * @oaram conn Connection handler to track.
 * @param edd The data descriptor to use when encoding.
 * @param data_in The pointer to the struct to encode into data.
 * @param cipher_key The key to use as cipher.
 * @return EINA_TRUE if the data where correctly send, EINA_FALSE if they don't.
 *
 * This function serialize data_in with edd, assemble the packet and call
 * Eet_Write_Cb when ready. The data passed Eet_Write_Cb are temporary allocated
 * and will vanish just after the return of the callback.
 *
 * @see eet_data_descriptor_encode_cipher
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI Eina_Bool
eet_connection_send(Eet_Connection      *conn,
                    Eet_Data_Descriptor *edd,
                    const void          *data_in,
                    const char          *cipher_key);

/**
 * Convert a Eet_Node tree and prepare it to be send.
 * @oaram conn Connection handler to track.
 * @param node The data tree to use when encoding.
 * @param cipher_key The key to use as cipher.
 * @return EINA_TRUE if the data where correctly send, EINA_FALSE if they don't.
 *
 * This function serialize node, assemble the packet and call
 * Eet_Write_Cb when ready. The data passed Eet_Write_Cb are temporary allocated
 * and will vanish just after the return of the callback.
 *
 * @see eet_data_node_encode_cipher
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI Eina_Bool
eet_connection_node_send(Eet_Connection *conn,
                         Eet_Node       *node,
                         const char     *cipher_key);

/**
 * Close a connection and lost its track.
 * @oaram conn Connection handler to close.
 * @param on_going Signal if a partial packet wasn't completed.
 * @return the user_data passed to both callback.
 *
 * @since 1.2.4
 * @ingroup Eet_Connection_Group
 */
EAPI void *
eet_connection_close(Eet_Connection *conn,
                     Eina_Bool      *on_going);

/***************************************************************************/

#ifdef __cplusplus
}
#endif /* ifdef __cplusplus */

#endif /* ifndef _EET_H */