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111
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1 /* gzguts.h -- zlib internal header definitions for gz* operations
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2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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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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9 # endif
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10 # ifdef _FILE_OFFSET_BITS
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11 # undef _FILE_OFFSET_BITS
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12 # endif
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13 #endif
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14
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15 #ifdef HAVE_HIDDEN
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16 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
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17 #else
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18 # define ZLIB_INTERNAL
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19 #endif
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20
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21 #include <stdio.h>
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22 #include "zlib.h"
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23 #ifdef STDC
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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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27 #endif
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28
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29 #ifndef _POSIX_SOURCE
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30 # define _POSIX_SOURCE
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31 #endif
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32 #include <fcntl.h>
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33
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34 #ifdef _WIN32
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35 # include <stddef.h>
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36 #endif
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37
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38 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
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39 # include <io.h>
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40 #endif
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41
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42 #if defined(_WIN32)
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43 # define WIDECHAR
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44 #endif
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45
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46 #ifdef WINAPI_FAMILY
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47 # define open _open
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48 # define read _read
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49 # define write _write
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50 # define close _close
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51 #endif
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52
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53 #ifdef NO_DEFLATE /* for compatibility with old definition */
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54 # define NO_GZCOMPRESS
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55 #endif
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56
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57 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
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58 # ifndef HAVE_VSNPRINTF
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59 # define HAVE_VSNPRINTF
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60 # endif
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61 #endif
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62
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63 #if defined(__CYGWIN__)
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64 # ifndef HAVE_VSNPRINTF
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65 # define HAVE_VSNPRINTF
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66 # endif
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67 #endif
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68
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69 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
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70 # ifndef HAVE_VSNPRINTF
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71 # define HAVE_VSNPRINTF
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72 # endif
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73 #endif
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74
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75 #ifndef HAVE_VSNPRINTF
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76 # ifdef MSDOS
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77 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
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78 but for now we just assume it doesn't. */
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79 # define NO_vsnprintf
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80 # endif
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81 # ifdef __TURBOC__
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82 # define NO_vsnprintf
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83 # endif
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84 # ifdef WIN32
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85 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
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86 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
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87 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
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88 # define vsnprintf _vsnprintf
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89 # endif
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90 # endif
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91 # endif
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92 # ifdef __SASC
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93 # define NO_vsnprintf
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94 # endif
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95 # ifdef VMS
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96 # define NO_vsnprintf
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97 # endif
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98 # ifdef __OS400__
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99 # define NO_vsnprintf
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100 # endif
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101 # ifdef __MVS__
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102 # define NO_vsnprintf
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103 # endif
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104 #endif
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105
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106 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
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107 null termination of the result -- however this is only used in gzlib.c where
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108 the result is assured to fit in the space provided */
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109 #if defined(_MSC_VER) && _MSC_VER < 1900
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110 # define snprintf _snprintf
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111 #endif
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112
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113 #ifndef local
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114 # define local static
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115 #endif
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116 /* since "static" is used to mean two completely different things in C, we
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117 define "local" for the non-static meaning of "static", for readability
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118 (compile with -Dlocal if your debugger can't find static symbols) */
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119
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120 /* gz* functions always use library allocation functions */
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121 #ifndef STDC
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122 extern voidp malloc OF((uInt size));
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123 extern void free OF((voidpf ptr));
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124 #endif
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125
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126 /* get errno and strerror definition */
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127 #if defined UNDER_CE
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128 # include <windows.h>
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129 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
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130 #else
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131 # ifndef NO_STRERROR
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132 # include <errno.h>
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133 # define zstrerror() strerror(errno)
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134 # else
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135 # define zstrerror() "stdio error (consult errno)"
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136 # endif
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137 #endif
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138
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139 /* provide prototypes for these when building zlib without LFS */
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140 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
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141 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
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142 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
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143 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
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144 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
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145 #endif
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146
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147 /* default memLevel */
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148 #if MAX_MEM_LEVEL >= 8
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149 # define DEF_MEM_LEVEL 8
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150 #else
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151 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
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152 #endif
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153
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154 /* default i/o buffer size -- double this for output when reading (this and
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155 twice this must be able to fit in an unsigned type) */
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156 #define GZBUFSIZE 8192
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157
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158 /* gzip modes, also provide a little integrity check on the passed structure */
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159 #define GZ_NONE 0
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160 #define GZ_READ 7247
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161 #define GZ_WRITE 31153
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162 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
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163
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164 /* values for gz_state how */
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165 #define LOOK 0 /* look for a gzip header */
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166 #define COPY 1 /* copy input directly */
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167 #define GZIP 2 /* decompress a gzip stream */
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168
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169 /* internal gzip file state data structure */
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170 typedef struct {
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171 /* exposed contents for gzgetc() macro */
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172 struct gzFile_s x; /* "x" for exposed */
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173 /* x.have: number of bytes available at x.next */
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174 /* x.next: next output data to deliver or write */
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175 /* x.pos: current position in uncompressed data */
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176 /* used for both reading and writing */
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177 int mode; /* see gzip modes above */
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178 int fd; /* file descriptor */
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179 char *path; /* path or fd for error messages */
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180 unsigned size; /* buffer size, zero if not allocated yet */
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181 unsigned want; /* requested buffer size, default is GZBUFSIZE */
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182 unsigned char *in; /* input buffer (double-sized when writing) */
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183 unsigned char *out; /* output buffer (double-sized when reading) */
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184 int direct; /* 0 if processing gzip, 1 if transparent */
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185 /* just for reading */
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186 int how; /* 0: get header, 1: copy, 2: decompress */
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187 z_off64_t start; /* where the gzip data started, for rewinding */
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188 int eof; /* true if end of input file reached */
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189 int past; /* true if read requested past end */
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190 /* just for writing */
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191 int level; /* compression level */
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192 int strategy; /* compression strategy */
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193 /* seek request */
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194 z_off64_t skip; /* amount to skip (already rewound if backwards) */
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195 int seek; /* true if seek request pending */
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196 /* error information */
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197 int err; /* error code */
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198 char *msg; /* error message */
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199 /* zlib inflate or deflate stream */
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200 z_stream strm; /* stream structure in-place (not a pointer) */
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201 } gz_state;
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202 typedef gz_state FAR *gz_statep;
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203
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204 /* shared functions */
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205 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
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206 #if defined UNDER_CE
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207 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
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208 #endif
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209
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210 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
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211 value -- needed when comparing unsigned to z_off64_t, which is signed
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212 (possible z_off64_t types off_t, off64_t, and long are all signed) */
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213 #ifdef INT_MAX
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214 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
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215 #else
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216 unsigned ZLIB_INTERNAL gz_intmax OF((void));
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217 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
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218 #endif
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