-/**
-@file eet.dox
-@brief Eet Data Handling Library Public API Calls
-
-These routines are used for Eet Library interaction
-*/
-
-/**
-
-@mainpage Eet Library Documentation
-
-@image html e_big.png
-
-@version @PACKAGE_VERSION@
-@author Carsten Haitzler <raster@@rasterman.com>
-@author David Goodlad <dgoodlad@@gmail.com>
-@author Cedric Bail <cedric.bail@@free.fr>
-@author Arnaud de Turckheim <quarium@@gmail.com>
-@author Luis Felipe Strano Moraes <lfelipe@@profusion.mobi>
-@author Chidambar Zinnoury <illogict@@online.fr>
-@author Vincent Torri <vtorri@@univ-evry.fr>
-@author Gustavo Sverzut Barbieri <barbieri@@profusion.mobi>
-@author Raphael Kubo da Costa <kubo@@profusion.mobi>
-@author Mathieu Taillefumier <mathieu.taillefumier@@free.fr>
-@author Albin "Lutin" Tonnerre <albin.tonnerre@@gmail.com>
-@author Adam Simpkins <adam@@adamsimpkins.net>
-@date 2000-2011
-
-@section toc Table of Contents
-
-@li @ref intro
-@li @ref example
-@li @ref format
-@li @ref compiling
-@li @ref install
-@li @ref next_steps
-@li @ref intro_example
-
-@section intro What is Eet?
-
-It is a tiny library designed to write an arbitrary set of chunks of data
-to a file and optionally compress each chunk (very much like a zip file)
-and allow fast random-access reading of the file later on. It does not
-do zip as a zip itself has more complexity than is needed, and it was much
-simpler to implement this once here.
-
-Eet is extremely fast, small and simple. Eet files can be very small and
-highly compressed, making them very optimal for just sending across the
-internet without having to archive, compress or decompress and install them.
-They allow for lightning-fast random-acess reads once created, making them
-perfect for storing data that is written once (or rarely) and read many
-times, but the program does not want to have to read it all in at once.
-
-It also can encode and decode data structures in memory, as well as image
-data for saving to Eet files or sending across the network to other
-machines, or just writing to arbitrary files on the system. All data is
-encoded in a platform independent way and can be written and read by any
-architecture.
-
-@section example A simple example on using Eet
-
-Here is a simple example on how to use Eet to save a series of strings to a
-file and load them again. The advantage of using Eet over just fprintf() and
-fscanf() is that not only can these entries be strings, they need no special
-parsing to handle delimiter characters or escaping, they can be binary data,
-image data, data structures containing integers, strings, other data
-structures, linked lists and much more, without the programmer having to
-worry about parsing, and best of all, Eet is very fast.
-
-@code
-#include <Eet.h>
-
-int
-main(int argc, char **argv)
-{
- Eet_File *ef;
- int i;
- char buf[32];
- char *ret;
- int size;
- char *entries[] =
- {
- "Entry 1",
- "Big text string here compared to others",
- "Eet is cool"
- };
-
- eet_init();
-
- // blindly open an file for output and write strings with their NUL char
- ef = eet_open("test.eet", EET_FILE_MODE_WRITE);
- eet_write(ef, "Entry 1", entries[0], strlen(entries[0]) + 1, 0);
- eet_write(ef, "Entry 2", entries[1], strlen(entries[1]) + 1, 1);
- eet_write(ef, "Entry 3", entries[2], strlen(entries[2]) + 1, 0);
- eet_close(ef);
-
- // open the file again and blindly get the entries we wrote
- ef = eet_open("test.eet", EET_FILE_MODE_READ);
- ret = eet_read(ef, "Entry 1", &size);
- printf("%s\n", ret);
- ret = eet_read(ef, "Entry 2", &size);
- printf("%s\n", ret);
- ret = eet_read(ef, "Entry 3", &size);
- printf("%s\n", ret);
- eet_close(ef);
-
- eet_shutdown();
-}
-@endcode
-
-@section format What does an Eet file look like?
-
-The file format is very simple. There is a directory block at the start of
-the file listing entries and offsets into the file where they are stored,
-their sizes, compression flags etc. followed by all the entry data strung one
-element after the other.
-
-All Eet files start with t a 4 byte magic number. It is written using network
-byte-order (big endian, or from most significant byte first to least
-significant byte last) and is 0x1ee7ff00 (or byte by byte 0:1e 1:e7 2:ff
-3:00). The next 4 bytes are an integer (in big endian notation) indicating
-how many entries are stored in the Eet file. 0 indicates it is empty. This is
-a signed integer and thus values less than 0 are invalid, limiting the number
-of entries in an Eet file to 0x7fffffff entries at most. The next 4 bytes is
-the size of the directory table, in bytes, encoded in big-endian format. This
-is a signed integer and cannot be less than 0.
-
-The directory table for the file follows immediately, with a continuous list
-of all entries in the Eet file, their offset in the file etc. The order of
-these entries is not important, but convention would have them be from first
-to last entry in the file. Each directory entry consiste of 5 integers, one
-after the other, each stored as a signed, big endian integer. The first is
-the offset in the file that the data for this entry is stored at (based from
-the very start of the file, not relative to the end of the directory block).
-The second integer holds flags for the entry. currently only the least
-significant bit (bit 0) holds any useful information, and it is set to 1 if
-the entry is compressed using zlib compression calls, or 0 if it is not
-compressed. The next integer is the size of the entry in bytes stored in the
-file. The next integer is the size of the data when decompressed (if it was
-compressed) in bytes. This may be the same as the previous integer if the
-entry was not compressed. The final integer is the number of bytes used by
-the string identifier for the entry, without the NUL byte terminator, which
-is not stored. The next series of bytes is the string name of the entry, with
-the number of bytes being the same as specified in the last integer above.
-This list of entries continues until there are no more entries left to list.
-To read an entry from an Eet file, simply find the appropriate entry in the
-directory table, find it's offset and size, and read it into memory. If it is
-compressed, decompress it using zlib and then use that data.
-
-Here is a data map of an Eet file. All integers are encoded using big-endian
-notation (most significant byte first) and are signed. There is no alignment
-of data, so all data types follow immediately on, one after the other. All
-compressed data is compressed using the zlib compress2() function, and
-decompressed using the zlib uncompress() function. Please see zlib
-documentation for more information as to the encoding of compressed data.
-
-@verbatim
-HEADER:
-[INT] Magic number (0x1ee7ff00)
-[INT] Number of entries in the directory table
-[INT] The size of the directory table, in bytes
-
-DIRECTORY TABLE ENTRIES (as many as specified in the header):
-[INT] Offest from file start at which entry is stored (in bytes)
-[INT] Entry flags (1 = compressed, 0 = not compressed)
-[INT] Size of data chunk in file (in bytes)
-[INT] Size of the data chunk once decompressed (or the same as above, if not)
-[INT] The length of the string itendifier, in bytes, without NUL terminator
-[STR] Series of bytes for the string identifier, no NUL terminator
-... more directory entries
-
-DATA STORED, ONE AFTER ANOTHER:
-[DAT] DATA ENTRY 1...
-[DAT] DATA ENTRY 2...
-[DAT] DATA ENTRY 3...
-... more data chunks
-@endverbatim
-
-The contents of each entry in an Eet file has no defined format as such. It
-is an opaque chunk of data, that is up to the application to deocde, unless
-it is an image, ecoded by Eet, or a data structure encoded by Eet. The data
-itself for these entries can be encoded and decoded by Eet with extra helper
-functions in Eet. eet_data_image_read() and eet_data_image_write() are used
-to handle reading and writing image data from a known Eet file entry name.
-eet_data_read() and eet_data_write() are used to decode and encode program
-data structures from an Eet file, making the loading and saving of program
-information stored in data structures a simple 1 function call process.
-
-Please see src/lib/eet_data.c for information on the format of these
-specially encoded data entries in an Eet file (for now).
-
-
-@section compiling How to compile using Eet ?
-
-Eet is a library your application links to. The procedure for this is very
-simple. You simply have to compile your application with the appropriate
-compiler flags that the @p pkg-config script outputs. For example:
-
-Compiling C or C++ files into object files:
-
-@verbatim
-gcc -c -o main.o main.c `pkg-config --cflags eet`
-@endverbatim
-
-Linking object files into a binary executable:
-
-@verbatim
-gcc -o my_application main.o `pkg-config --libs eet`
-@endverbatim
-
-You simply have to make sure that pkg-config is in your shell's PATH (see
-the manual page for your appropriate shell) and eet.pc in /usr/lib/pkgconfig
-or its path is in the PKG_CONFIG_PATH environment variable. It's that simple
-to link and use Eet once you have written your code to use it.
-
-Since the program is linked to Eet, it is now able to use any advertised
-API calls to serialize your data.
-
-You should make sure you add any extra compile and link flags to your
-compile commands that your application may need as well. The above example
-is only guaranteed to make Eet add it's own requirements.
-
-
-@section install How is it installed?
-
-Simple:
-
-@verbatim
-./configure
-make
-su -
-...
-make install
-@endverbatim
-
-@section next_steps Next Steps
-
-After you understood what Eet is and installed it in your system you
-should proceed understanding the programming interface. We'd recommend
-you to take a while to learn Eina
-(http://docs.enlightenment.org/auto/eina/) as it is very convenient
-and optimized, and Eet provides integration with it.
-
-Recommended reading:
-
-@li @ref Eet_File_Group to know the basics to open and save files.
-@li @ref Eet_Data_Group to know the convenient way to serialize and
- parse your data structures automatically. Just create your
- descriptors and let Eet do the work for you.
-
-@section intro_example Introductory Examples
-
-@ref Examples
-
-@todo Document data format for images and data structures.
-
-*/
projects / framework / uifw / eet.git / blobdiff