1 /* gzguts.h -- zlib internal header definitions for gz* operations
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2 * Copyright (C) 2004, 2005, 2010 Mark Adler
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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6 #ifdef _LARGEFILE64_SOURCE
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7 # ifndef _LARGEFILE_SOURCE
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8 # define _LARGEFILE_SOURCE 1
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10 # ifdef _FILE_OFFSET_BITS
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11 # undef _FILE_OFFSET_BITS
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15 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ) && !defined(_WIN32)
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16 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
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18 # define ZLIB_INTERNAL
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24 # include <string.h>
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25 # include <stdlib.h>
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26 # include <limits.h>
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30 #ifdef NO_DEFLATE /* for compatibility with old definition */
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31 # define NO_GZCOMPRESS
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36 # define vsnprintf _vsnprintf
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40 # define local static
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42 /* compile with -Dlocal if your debugger can't find static symbols */
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44 /* gz* functions always use library allocation functions */
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46 extern voidp malloc OF((uInt size));
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47 extern void free OF((voidpf ptr));
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50 /* get errno and strerror definition */
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51 #if defined UNDER_CE
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52 # include <windows.h>
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53 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
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57 # define zstrerror() strerror(errno)
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59 # define zstrerror() "stdio error (consult errno)"
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63 /* provide prototypes for these when building zlib without LFS */
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64 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
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65 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
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66 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
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67 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
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68 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
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71 /* default i/o buffer size -- double this for output when reading */
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72 #define GZBUFSIZE 8192
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74 /* gzip modes, also provide a little integrity check on the passed structure */
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76 #define GZ_READ 7247
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77 #define GZ_WRITE 31153
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78 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
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80 /* values for gz_state how */
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81 #define LOOK 0 /* look for a gzip header */
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82 #define COPY 1 /* copy input directly */
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83 #define GZIP 2 /* decompress a gzip stream */
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85 /* internal gzip file state data structure */
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87 /* used for both reading and writing */
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88 int mode; /* see gzip modes above */
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89 int fd; /* file descriptor */
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90 char *path; /* path or fd for error messages */
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91 z_off64_t pos; /* current position in uncompressed data */
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92 unsigned size; /* buffer size, zero if not allocated yet */
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93 unsigned want; /* requested buffer size, default is GZBUFSIZE */
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94 unsigned char *in; /* input buffer */
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95 unsigned char *out; /* output buffer (double-sized when reading) */
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96 unsigned char *next; /* next output data to deliver or write */
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97 /* just for reading */
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98 unsigned have; /* amount of output data unused at next */
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99 int eof; /* true if end of input file reached */
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100 z_off64_t start; /* where the gzip data started, for rewinding */
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101 z_off64_t raw; /* where the raw data started, for seeking */
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102 int how; /* 0: get header, 1: copy, 2: decompress */
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103 int direct; /* true if last read direct, false if gzip */
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104 /* just for writing */
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105 int level; /* compression level */
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106 int strategy; /* compression strategy */
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108 z_off64_t skip; /* amount to skip (already rewound if backwards) */
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109 int seek; /* true if seek request pending */
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110 /* error information */
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111 int err; /* error code */
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112 char *msg; /* error message */
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113 /* zlib inflate or deflate stream */
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114 z_stream strm; /* stream structure in-place (not a pointer) */
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116 typedef gz_state FAR *gz_statep;
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118 /* shared functions */
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119 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
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120 #if defined UNDER_CE
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121 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
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124 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
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125 value -- needed when comparing unsigned to z_off64_t, which is signed
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126 (possible z_off64_t types off_t, off64_t, and long are all signed) */
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128 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
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130 unsigned ZLIB_INTERNAL gz_intmax OF((void));
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131 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
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