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716 | lvd | 1 | /* zlib.h -- interface of the 'zlib' general purpose compression library |
2 | version 1.2.3, July 18th, 2005 |
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3 | |||
4 | Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler |
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5 | |||
6 | This software is provided 'as-is', without any express or implied |
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7 | warranty. In no event will the authors be held liable for any damages |
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8 | arising from the use of this software. |
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9 | |||
10 | Permission is granted to anyone to use this software for any purpose, |
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11 | including commercial applications, and to alter it and redistribute it |
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12 | freely, subject to the following restrictions: |
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13 | |||
14 | 1. The origin of this software must not be misrepresented; you must not |
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15 | claim that you wrote the original software. If you use this software |
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16 | in a product, an acknowledgment in the product documentation would be |
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17 | appreciated but is not required. |
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18 | 2. Altered source versions must be plainly marked as such, and must not be |
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19 | misrepresented as being the original software. |
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20 | 3. This notice may not be removed or altered from any source distribution. |
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21 | |||
22 | Jean-loup Gailly Mark Adler |
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23 | jloup@gzip.org madler@alumni.caltech.edu |
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24 | |||
25 | |||
26 | The data format used by the zlib library is described by RFCs (Request for |
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27 | Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt |
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28 | (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). |
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29 | */ |
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30 | |||
31 | #ifndef ZLIB_H |
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32 | #define ZLIB_H |
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33 | |||
34 | #include "zconf.h" |
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35 | |||
36 | #ifdef __cplusplus |
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37 | extern "C" { |
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38 | #endif |
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39 | |||
40 | #define ZLIB_VERSION "1.2.3" |
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41 | #define ZLIB_VERNUM 0x1230 |
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42 | |||
43 | /* |
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44 | The 'zlib' compression library provides in-memory compression and |
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45 | decompression functions, including integrity checks of the uncompressed |
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46 | data. This version of the library supports only one compression method |
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47 | (deflation) but other algorithms will be added later and will have the same |
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48 | stream interface. |
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49 | |||
50 | Compression can be done in a single step if the buffers are large |
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51 | enough (for example if an input file is mmap'ed), or can be done by |
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52 | repeated calls of the compression function. In the latter case, the |
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53 | application must provide more input and/or consume the output |
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54 | (providing more output space) before each call. |
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55 | |||
56 | The compressed data format used by default by the in-memory functions is |
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57 | the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped |
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58 | around a deflate stream, which is itself documented in RFC 1951. |
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59 | |||
60 | The library also supports reading and writing files in gzip (.gz) format |
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61 | with an interface similar to that of stdio using the functions that start |
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62 | with "gz". The gzip format is different from the zlib format. gzip is a |
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63 | gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. |
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64 | |||
65 | This library can optionally read and write gzip streams in memory as well. |
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66 | |||
67 | The zlib format was designed to be compact and fast for use in memory |
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68 | and on communications channels. The gzip format was designed for single- |
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69 | file compression on file systems, has a larger header than zlib to maintain |
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70 | directory information, and uses a different, slower check method than zlib. |
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71 | |||
72 | The library does not install any signal handler. The decoder checks |
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73 | the consistency of the compressed data, so the library should never |
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74 | crash even in case of corrupted input. |
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75 | */ |
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76 | |||
77 | typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); |
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78 | typedef void (*free_func) OF((voidpf opaque, voidpf address)); |
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79 | |||
80 | struct internal_state; |
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81 | |||
82 | typedef struct z_stream_s { |
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83 | Bytef *next_in; /* next input byte */ |
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84 | uInt avail_in; /* number of bytes available at next_in */ |
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85 | uLong total_in; /* total nb of input bytes read so far */ |
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86 | |||
87 | Bytef *next_out; /* next output byte should be put there */ |
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88 | uInt avail_out; /* remaining free space at next_out */ |
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89 | uLong total_out; /* total nb of bytes output so far */ |
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90 | |||
91 | char *msg; /* last error message, NULL if no error */ |
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92 | struct internal_state FAR *state; /* not visible by applications */ |
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93 | |||
94 | alloc_func zalloc; /* used to allocate the internal state */ |
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95 | free_func zfree; /* used to free the internal state */ |
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96 | voidpf opaque; /* private data object passed to zalloc and zfree */ |
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97 | |||
98 | int data_type; /* best guess about the data type: binary or text */ |
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99 | uLong adler; /* adler32 value of the uncompressed data */ |
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100 | uLong reserved; /* reserved for future use */ |
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101 | } z_stream; |
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102 | |||
103 | typedef z_stream FAR *z_streamp; |
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104 | |||
105 | /* |
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106 | gzip header information passed to and from zlib routines. See RFC 1952 |
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107 | for more details on the meanings of these fields. |
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108 | */ |
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109 | typedef struct gz_header_s { |
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110 | int text; /* true if compressed data believed to be text */ |
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111 | uLong time; /* modification time */ |
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112 | int xflags; /* extra flags (not used when writing a gzip file) */ |
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113 | int os; /* operating system */ |
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114 | Bytef *extra; /* pointer to extra field or Z_NULL if none */ |
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115 | uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ |
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116 | uInt extra_max; /* space at extra (only when reading header) */ |
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117 | Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ |
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118 | uInt name_max; /* space at name (only when reading header) */ |
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119 | Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ |
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120 | uInt comm_max; /* space at comment (only when reading header) */ |
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121 | int hcrc; /* true if there was or will be a header crc */ |
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122 | int done; /* true when done reading gzip header (not used |
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123 | when writing a gzip file) */ |
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124 | } gz_header; |
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125 | |||
126 | typedef gz_header FAR *gz_headerp; |
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127 | |||
128 | /* |
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129 | The application must update next_in and avail_in when avail_in has |
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130 | dropped to zero. It must update next_out and avail_out when avail_out |
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131 | has dropped to zero. The application must initialize zalloc, zfree and |
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132 | opaque before calling the init function. All other fields are set by the |
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133 | compression library and must not be updated by the application. |
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134 | |||
135 | The opaque value provided by the application will be passed as the first |
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136 | parameter for calls of zalloc and zfree. This can be useful for custom |
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137 | memory management. The compression library attaches no meaning to the |
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138 | opaque value. |
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139 | |||
140 | zalloc must return Z_NULL if there is not enough memory for the object. |
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141 | If zlib is used in a multi-threaded application, zalloc and zfree must be |
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142 | thread safe. |
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143 | |||
144 | On 16-bit systems, the functions zalloc and zfree must be able to allocate |
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145 | exactly 65536 bytes, but will not be required to allocate more than this |
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146 | if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, |
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147 | pointers returned by zalloc for objects of exactly 65536 bytes *must* |
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148 | have their offset normalized to zero. The default allocation function |
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149 | provided by this library ensures this (see zutil.c). To reduce memory |
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150 | requirements and avoid any allocation of 64K objects, at the expense of |
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151 | compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). |
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152 | |||
153 | The fields total_in and total_out can be used for statistics or |
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154 | progress reports. After compression, total_in holds the total size of |
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155 | the uncompressed data and may be saved for use in the decompressor |
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156 | (particularly if the decompressor wants to decompress everything in |
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157 | a single step). |
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158 | */ |
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159 | |||
160 | /* constants */ |
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161 | |||
162 | #define Z_NO_FLUSH 0 |
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163 | #define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ |
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164 | #define Z_SYNC_FLUSH 2 |
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165 | #define Z_FULL_FLUSH 3 |
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166 | #define Z_FINISH 4 |
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167 | #define Z_BLOCK 5 |
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168 | /* Allowed flush values; see deflate() and inflate() below for details */ |
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169 | |||
170 | #define Z_OK 0 |
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171 | #define Z_STREAM_END 1 |
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172 | #define Z_NEED_DICT 2 |
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173 | #define Z_ERRNO (-1) |
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174 | #define Z_STREAM_ERROR (-2) |
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175 | #define Z_DATA_ERROR (-3) |
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176 | #define Z_MEM_ERROR (-4) |
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177 | #define Z_BUF_ERROR (-5) |
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178 | #define Z_VERSION_ERROR (-6) |
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179 | /* Return codes for the compression/decompression functions. Negative |
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180 | * values are errors, positive values are used for special but normal events. |
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181 | */ |
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182 | |||
183 | #define Z_NO_COMPRESSION 0 |
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184 | #define Z_BEST_SPEED 1 |
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185 | #define Z_BEST_COMPRESSION 9 |
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186 | #define Z_DEFAULT_COMPRESSION (-1) |
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187 | /* compression levels */ |
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188 | |||
189 | #define Z_FILTERED 1 |
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190 | #define Z_HUFFMAN_ONLY 2 |
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191 | #define Z_RLE 3 |
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192 | #define Z_FIXED 4 |
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193 | #define Z_DEFAULT_STRATEGY 0 |
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194 | /* compression strategy; see deflateInit2() below for details */ |
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195 | |||
196 | #define Z_BINARY 0 |
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197 | #define Z_TEXT 1 |
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198 | #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ |
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199 | #define Z_UNKNOWN 2 |
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200 | /* Possible values of the data_type field (though see inflate()) */ |
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201 | |||
202 | #define Z_DEFLATED 8 |
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203 | /* The deflate compression method (the only one supported in this version) */ |
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204 | |||
205 | #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ |
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206 | |||
207 | #define zlib_version zlibVersion() |
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208 | /* for compatibility with versions < 1.0.2 */ |
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209 | |||
210 | /* basic functions */ |
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211 | |||
212 | ZEXTERN const char * ZEXPORT zlibVersion OF((void)); |
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213 | /* The application can compare zlibVersion and ZLIB_VERSION for consistency. |
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214 | If the first character differs, the library code actually used is |
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215 | not compatible with the zlib.h header file used by the application. |
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216 | This check is automatically made by deflateInit and inflateInit. |
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217 | */ |
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218 | |||
219 | /* |
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220 | ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); |
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221 | |||
222 | Initializes the internal stream state for compression. The fields |
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223 | zalloc, zfree and opaque must be initialized before by the caller. |
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224 | If zalloc and zfree are set to Z_NULL, deflateInit updates them to |
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225 | use default allocation functions. |
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226 | |||
227 | The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: |
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228 | 1 gives best speed, 9 gives best compression, 0 gives no compression at |
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229 | all (the input data is simply copied a block at a time). |
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230 | Z_DEFAULT_COMPRESSION requests a default compromise between speed and |
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231 | compression (currently equivalent to level 6). |
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232 | |||
233 | deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not |
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234 | enough memory, Z_STREAM_ERROR if level is not a valid compression level, |
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235 | Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible |
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236 | with the version assumed by the caller (ZLIB_VERSION). |
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237 | msg is set to null if there is no error message. deflateInit does not |
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238 | perform any compression: this will be done by deflate(). |
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239 | */ |
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240 | |||
241 | |||
242 | ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); |
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243 | /* |
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244 | deflate compresses as much data as possible, and stops when the input |
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245 | buffer becomes empty or the output buffer becomes full. It may introduce some |
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246 | output latency (reading input without producing any output) except when |
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247 | forced to flush. |
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248 | |||
249 | The detailed semantics are as follows. deflate performs one or both of the |
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250 | following actions: |
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251 | |||
252 | - Compress more input starting at next_in and update next_in and avail_in |
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253 | accordingly. If not all input can be processed (because there is not |
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254 | enough room in the output buffer), next_in and avail_in are updated and |
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255 | processing will resume at this point for the next call of deflate(). |
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256 | |||
257 | - Provide more output starting at next_out and update next_out and avail_out |
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258 | accordingly. This action is forced if the parameter flush is non zero. |
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259 | Forcing flush frequently degrades the compression ratio, so this parameter |
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260 | should be set only when necessary (in interactive applications). |
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261 | Some output may be provided even if flush is not set. |
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262 | |||
263 | Before the call of deflate(), the application should ensure that at least |
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264 | one of the actions is possible, by providing more input and/or consuming |
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265 | more output, and updating avail_in or avail_out accordingly; avail_out |
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266 | should never be zero before the call. The application can consume the |
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267 | compressed output when it wants, for example when the output buffer is full |
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268 | (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK |
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269 | and with zero avail_out, it must be called again after making room in the |
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270 | output buffer because there might be more output pending. |
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271 | |||
272 | Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to |
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273 | decide how much data to accumualte before producing output, in order to |
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274 | maximize compression. |
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275 | |||
276 | If the parameter flush is set to Z_SYNC_FLUSH, all pending output is |
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277 | flushed to the output buffer and the output is aligned on a byte boundary, so |
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278 | that the decompressor can get all input data available so far. (In particular |
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279 | avail_in is zero after the call if enough output space has been provided |
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280 | before the call.) Flushing may degrade compression for some compression |
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281 | algorithms and so it should be used only when necessary. |
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282 | |||
283 | If flush is set to Z_FULL_FLUSH, all output is flushed as with |
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284 | Z_SYNC_FLUSH, and the compression state is reset so that decompression can |
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285 | restart from this point if previous compressed data has been damaged or if |
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286 | random access is desired. Using Z_FULL_FLUSH too often can seriously degrade |
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287 | compression. |
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288 | |||
289 | If deflate returns with avail_out == 0, this function must be called again |
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290 | with the same value of the flush parameter and more output space (updated |
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291 | avail_out), until the flush is complete (deflate returns with non-zero |
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292 | avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that |
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293 | avail_out is greater than six to avoid repeated flush markers due to |
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294 | avail_out == 0 on return. |
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295 | |||
296 | If the parameter flush is set to Z_FINISH, pending input is processed, |
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297 | pending output is flushed and deflate returns with Z_STREAM_END if there |
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298 | was enough output space; if deflate returns with Z_OK, this function must be |
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299 | called again with Z_FINISH and more output space (updated avail_out) but no |
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300 | more input data, until it returns with Z_STREAM_END or an error. After |
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301 | deflate has returned Z_STREAM_END, the only possible operations on the |
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302 | stream are deflateReset or deflateEnd. |
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303 | |||
304 | Z_FINISH can be used immediately after deflateInit if all the compression |
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305 | is to be done in a single step. In this case, avail_out must be at least |
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306 | the value returned by deflateBound (see below). If deflate does not return |
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307 | Z_STREAM_END, then it must be called again as described above. |
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308 | |||
309 | deflate() sets strm->adler to the adler32 checksum of all input read |
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310 | so far (that is, total_in bytes). |
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311 | |||
312 | deflate() may update strm->data_type if it can make a good guess about |
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313 | the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered |
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314 | binary. This field is only for information purposes and does not affect |
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315 | the compression algorithm in any manner. |
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316 | |||
317 | deflate() returns Z_OK if some progress has been made (more input |
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318 | processed or more output produced), Z_STREAM_END if all input has been |
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319 | consumed and all output has been produced (only when flush is set to |
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320 | Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example |
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321 | if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible |
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322 | (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not |
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323 | fatal, and deflate() can be called again with more input and more output |
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324 | space to continue compressing. |
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325 | */ |
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326 | |||
327 | |||
328 | ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); |
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329 | /* |
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330 | All dynamically allocated data structures for this stream are freed. |
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331 | This function discards any unprocessed input and does not flush any |
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332 | pending output. |
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333 | |||
334 | deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the |
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335 | stream state was inconsistent, Z_DATA_ERROR if the stream was freed |
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336 | prematurely (some input or output was discarded). In the error case, |
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337 | msg may be set but then points to a static string (which must not be |
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338 | deallocated). |
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339 | */ |
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340 | |||
341 | |||
342 | /* |
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343 | ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); |
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344 | |||
345 | Initializes the internal stream state for decompression. The fields |
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346 | next_in, avail_in, zalloc, zfree and opaque must be initialized before by |
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347 | the caller. If next_in is not Z_NULL and avail_in is large enough (the exact |
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348 | value depends on the compression method), inflateInit determines the |
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349 | compression method from the zlib header and allocates all data structures |
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350 | accordingly; otherwise the allocation will be deferred to the first call of |
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351 | inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to |
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352 | use default allocation functions. |
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353 | |||
354 | inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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355 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
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356 | version assumed by the caller. msg is set to null if there is no error |
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357 | message. inflateInit does not perform any decompression apart from reading |
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358 | the zlib header if present: this will be done by inflate(). (So next_in and |
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359 | avail_in may be modified, but next_out and avail_out are unchanged.) |
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360 | */ |
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361 | |||
362 | |||
363 | ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); |
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364 | /* |
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365 | inflate decompresses as much data as possible, and stops when the input |
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366 | buffer becomes empty or the output buffer becomes full. It may introduce |
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367 | some output latency (reading input without producing any output) except when |
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368 | forced to flush. |
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369 | |||
370 | The detailed semantics are as follows. inflate performs one or both of the |
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371 | following actions: |
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372 | |||
373 | - Decompress more input starting at next_in and update next_in and avail_in |
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374 | accordingly. If not all input can be processed (because there is not |
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375 | enough room in the output buffer), next_in is updated and processing |
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376 | will resume at this point for the next call of inflate(). |
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377 | |||
378 | - Provide more output starting at next_out and update next_out and avail_out |
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379 | accordingly. inflate() provides as much output as possible, until there |
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380 | is no more input data or no more space in the output buffer (see below |
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381 | about the flush parameter). |
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382 | |||
383 | Before the call of inflate(), the application should ensure that at least |
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384 | one of the actions is possible, by providing more input and/or consuming |
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385 | more output, and updating the next_* and avail_* values accordingly. |
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386 | The application can consume the uncompressed output when it wants, for |
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387 | example when the output buffer is full (avail_out == 0), or after each |
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388 | call of inflate(). If inflate returns Z_OK and with zero avail_out, it |
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389 | must be called again after making room in the output buffer because there |
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390 | might be more output pending. |
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391 | |||
392 | The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, |
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393 | Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much |
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394 | output as possible to the output buffer. Z_BLOCK requests that inflate() stop |
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395 | if and when it gets to the next deflate block boundary. When decoding the |
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396 | zlib or gzip format, this will cause inflate() to return immediately after |
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397 | the header and before the first block. When doing a raw inflate, inflate() |
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398 | will go ahead and process the first block, and will return when it gets to |
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399 | the end of that block, or when it runs out of data. |
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400 | |||
401 | The Z_BLOCK option assists in appending to or combining deflate streams. |
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402 | Also to assist in this, on return inflate() will set strm->data_type to the |
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403 | number of unused bits in the last byte taken from strm->next_in, plus 64 |
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404 | if inflate() is currently decoding the last block in the deflate stream, |
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405 | plus 128 if inflate() returned immediately after decoding an end-of-block |
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406 | code or decoding the complete header up to just before the first byte of the |
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407 | deflate stream. The end-of-block will not be indicated until all of the |
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408 | uncompressed data from that block has been written to strm->next_out. The |
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409 | number of unused bits may in general be greater than seven, except when |
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410 | bit 7 of data_type is set, in which case the number of unused bits will be |
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411 | less than eight. |
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412 | |||
413 | inflate() should normally be called until it returns Z_STREAM_END or an |
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414 | error. However if all decompression is to be performed in a single step |
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415 | (a single call of inflate), the parameter flush should be set to |
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416 | Z_FINISH. In this case all pending input is processed and all pending |
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417 | output is flushed; avail_out must be large enough to hold all the |
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418 | uncompressed data. (The size of the uncompressed data may have been saved |
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419 | by the compressor for this purpose.) The next operation on this stream must |
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420 | be inflateEnd to deallocate the decompression state. The use of Z_FINISH |
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421 | is never required, but can be used to inform inflate that a faster approach |
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422 | may be used for the single inflate() call. |
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423 | |||
424 | In this implementation, inflate() always flushes as much output as |
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425 | possible to the output buffer, and always uses the faster approach on the |
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426 | first call. So the only effect of the flush parameter in this implementation |
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427 | is on the return value of inflate(), as noted below, or when it returns early |
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428 | because Z_BLOCK is used. |
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429 | |||
430 | If a preset dictionary is needed after this call (see inflateSetDictionary |
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431 | below), inflate sets strm->adler to the adler32 checksum of the dictionary |
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432 | chosen by the compressor and returns Z_NEED_DICT; otherwise it sets |
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433 | strm->adler to the adler32 checksum of all output produced so far (that is, |
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434 | total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described |
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435 | below. At the end of the stream, inflate() checks that its computed adler32 |
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436 | checksum is equal to that saved by the compressor and returns Z_STREAM_END |
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437 | only if the checksum is correct. |
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438 | |||
439 | inflate() will decompress and check either zlib-wrapped or gzip-wrapped |
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440 | deflate data. The header type is detected automatically. Any information |
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441 | contained in the gzip header is not retained, so applications that need that |
||
442 | information should instead use raw inflate, see inflateInit2() below, or |
||
443 | inflateBack() and perform their own processing of the gzip header and |
||
444 | trailer. |
||
445 | |||
446 | inflate() returns Z_OK if some progress has been made (more input processed |
||
447 | or more output produced), Z_STREAM_END if the end of the compressed data has |
||
448 | been reached and all uncompressed output has been produced, Z_NEED_DICT if a |
||
449 | preset dictionary is needed at this point, Z_DATA_ERROR if the input data was |
||
450 | corrupted (input stream not conforming to the zlib format or incorrect check |
||
451 | value), Z_STREAM_ERROR if the stream structure was inconsistent (for example |
||
452 | if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, |
||
453 | Z_BUF_ERROR if no progress is possible or if there was not enough room in the |
||
454 | output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and |
||
455 | inflate() can be called again with more input and more output space to |
||
456 | continue decompressing. If Z_DATA_ERROR is returned, the application may then |
||
457 | call inflateSync() to look for a good compression block if a partial recovery |
||
458 | of the data is desired. |
||
459 | */ |
||
460 | |||
461 | |||
462 | ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); |
||
463 | /* |
||
464 | All dynamically allocated data structures for this stream are freed. |
||
465 | This function discards any unprocessed input and does not flush any |
||
466 | pending output. |
||
467 | |||
468 | inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state |
||
469 | was inconsistent. In the error case, msg may be set but then points to a |
||
470 | static string (which must not be deallocated). |
||
471 | */ |
||
472 | |||
473 | /* Advanced functions */ |
||
474 | |||
475 | /* |
||
476 | The following functions are needed only in some special applications. |
||
477 | */ |
||
478 | |||
479 | /* |
||
480 | ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, |
||
481 | int level, |
||
482 | int method, |
||
483 | int windowBits, |
||
484 | int memLevel, |
||
485 | int strategy)); |
||
486 | |||
487 | This is another version of deflateInit with more compression options. The |
||
488 | fields next_in, zalloc, zfree and opaque must be initialized before by |
||
489 | the caller. |
||
490 | |||
491 | The method parameter is the compression method. It must be Z_DEFLATED in |
||
492 | this version of the library. |
||
493 | |||
494 | The windowBits parameter is the base two logarithm of the window size |
||
495 | (the size of the history buffer). It should be in the range 8..15 for this |
||
496 | version of the library. Larger values of this parameter result in better |
||
497 | compression at the expense of memory usage. The default value is 15 if |
||
498 | deflateInit is used instead. |
||
499 | |||
500 | windowBits can also be -8..-15 for raw deflate. In this case, -windowBits |
||
501 | determines the window size. deflate() will then generate raw deflate data |
||
502 | with no zlib header or trailer, and will not compute an adler32 check value. |
||
503 | |||
504 | windowBits can also be greater than 15 for optional gzip encoding. Add |
||
505 | 16 to windowBits to write a simple gzip header and trailer around the |
||
506 | compressed data instead of a zlib wrapper. The gzip header will have no |
||
507 | file name, no extra data, no comment, no modification time (set to zero), |
||
508 | no header crc, and the operating system will be set to 255 (unknown). If a |
||
509 | gzip stream is being written, strm->adler is a crc32 instead of an adler32. |
||
510 | |||
511 | The memLevel parameter specifies how much memory should be allocated |
||
512 | for the internal compression state. memLevel=1 uses minimum memory but |
||
513 | is slow and reduces compression ratio; memLevel=9 uses maximum memory |
||
514 | for optimal speed. The default value is 8. See zconf.h for total memory |
||
515 | usage as a function of windowBits and memLevel. |
||
516 | |||
517 | The strategy parameter is used to tune the compression algorithm. Use the |
||
518 | value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a |
||
519 | filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no |
||
520 | string match), or Z_RLE to limit match distances to one (run-length |
||
521 | encoding). Filtered data consists mostly of small values with a somewhat |
||
522 | random distribution. In this case, the compression algorithm is tuned to |
||
523 | compress them better. The effect of Z_FILTERED is to force more Huffman |
||
524 | coding and less string matching; it is somewhat intermediate between |
||
525 | Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as |
||
526 | Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy |
||
527 | parameter only affects the compression ratio but not the correctness of the |
||
528 | compressed output even if it is not set appropriately. Z_FIXED prevents the |
||
529 | use of dynamic Huffman codes, allowing for a simpler decoder for special |
||
530 | applications. |
||
531 | |||
532 | deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
||
533 | memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid |
||
534 | method). msg is set to null if there is no error message. deflateInit2 does |
||
535 | not perform any compression: this will be done by deflate(). |
||
536 | */ |
||
537 | |||
538 | ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, |
||
539 | const Bytef *dictionary, |
||
540 | uInt dictLength)); |
||
541 | /* |
||
542 | Initializes the compression dictionary from the given byte sequence |
||
543 | without producing any compressed output. This function must be called |
||
544 | immediately after deflateInit, deflateInit2 or deflateReset, before any |
||
545 | call of deflate. The compressor and decompressor must use exactly the same |
||
546 | dictionary (see inflateSetDictionary). |
||
547 | |||
548 | The dictionary should consist of strings (byte sequences) that are likely |
||
549 | to be encountered later in the data to be compressed, with the most commonly |
||
550 | used strings preferably put towards the end of the dictionary. Using a |
||
551 | dictionary is most useful when the data to be compressed is short and can be |
||
552 | predicted with good accuracy; the data can then be compressed better than |
||
553 | with the default empty dictionary. |
||
554 | |||
555 | Depending on the size of the compression data structures selected by |
||
556 | deflateInit or deflateInit2, a part of the dictionary may in effect be |
||
557 | discarded, for example if the dictionary is larger than the window size in |
||
558 | deflate or deflate2. Thus the strings most likely to be useful should be |
||
559 | put at the end of the dictionary, not at the front. In addition, the |
||
560 | current implementation of deflate will use at most the window size minus |
||
561 | 262 bytes of the provided dictionary. |
||
562 | |||
563 | Upon return of this function, strm->adler is set to the adler32 value |
||
564 | of the dictionary; the decompressor may later use this value to determine |
||
565 | which dictionary has been used by the compressor. (The adler32 value |
||
566 | applies to the whole dictionary even if only a subset of the dictionary is |
||
567 | actually used by the compressor.) If a raw deflate was requested, then the |
||
568 | adler32 value is not computed and strm->adler is not set. |
||
569 | |||
570 | deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a |
||
571 | parameter is invalid (such as NULL dictionary) or the stream state is |
||
572 | inconsistent (for example if deflate has already been called for this stream |
||
573 | or if the compression method is bsort). deflateSetDictionary does not |
||
574 | perform any compression: this will be done by deflate(). |
||
575 | */ |
||
576 | |||
577 | ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, |
||
578 | z_streamp source)); |
||
579 | /* |
||
580 | Sets the destination stream as a complete copy of the source stream. |
||
581 | |||
582 | This function can be useful when several compression strategies will be |
||
583 | tried, for example when there are several ways of pre-processing the input |
||
584 | data with a filter. The streams that will be discarded should then be freed |
||
585 | by calling deflateEnd. Note that deflateCopy duplicates the internal |
||
586 | compression state which can be quite large, so this strategy is slow and |
||
587 | can consume lots of memory. |
||
588 | |||
589 | deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not |
||
590 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent |
||
591 | (such as zalloc being NULL). msg is left unchanged in both source and |
||
592 | destination. |
||
593 | */ |
||
594 | |||
595 | ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); |
||
596 | /* |
||
597 | This function is equivalent to deflateEnd followed by deflateInit, |
||
598 | but does not free and reallocate all the internal compression state. |
||
599 | The stream will keep the same compression level and any other attributes |
||
600 | that may have been set by deflateInit2. |
||
601 | |||
602 | deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
||
603 | stream state was inconsistent (such as zalloc or state being NULL). |
||
604 | */ |
||
605 | |||
606 | ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, |
||
607 | int level, |
||
608 | int strategy)); |
||
609 | /* |
||
610 | Dynamically update the compression level and compression strategy. The |
||
611 | interpretation of level and strategy is as in deflateInit2. This can be |
||
612 | used to switch between compression and straight copy of the input data, or |
||
613 | to switch to a different kind of input data requiring a different |
||
614 | strategy. If the compression level is changed, the input available so far |
||
615 | is compressed with the old level (and may be flushed); the new level will |
||
616 | take effect only at the next call of deflate(). |
||
617 | |||
618 | Before the call of deflateParams, the stream state must be set as for |
||
619 | a call of deflate(), since the currently available input may have to |
||
620 | be compressed and flushed. In particular, strm->avail_out must be non-zero. |
||
621 | |||
622 | deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source |
||
623 | stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR |
||
624 | if strm->avail_out was zero. |
||
625 | */ |
||
626 | |||
627 | ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, |
||
628 | int good_length, |
||
629 | int max_lazy, |
||
630 | int nice_length, |
||
631 | int max_chain)); |
||
632 | /* |
||
633 | Fine tune deflate's internal compression parameters. This should only be |
||
634 | used by someone who understands the algorithm used by zlib's deflate for |
||
635 | searching for the best matching string, and even then only by the most |
||
636 | fanatic optimizer trying to squeeze out the last compressed bit for their |
||
637 | specific input data. Read the deflate.c source code for the meaning of the |
||
638 | max_lazy, good_length, nice_length, and max_chain parameters. |
||
639 | |||
640 | deflateTune() can be called after deflateInit() or deflateInit2(), and |
||
641 | returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. |
||
642 | */ |
||
643 | |||
644 | ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, |
||
645 | uLong sourceLen)); |
||
646 | /* |
||
647 | deflateBound() returns an upper bound on the compressed size after |
||
648 | deflation of sourceLen bytes. It must be called after deflateInit() |
||
649 | or deflateInit2(). This would be used to allocate an output buffer |
||
650 | for deflation in a single pass, and so would be called before deflate(). |
||
651 | */ |
||
652 | |||
653 | ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, |
||
654 | int bits, |
||
655 | int value)); |
||
656 | /* |
||
657 | deflatePrime() inserts bits in the deflate output stream. The intent |
||
658 | is that this function is used to start off the deflate output with the |
||
659 | bits leftover from a previous deflate stream when appending to it. As such, |
||
660 | this function can only be used for raw deflate, and must be used before the |
||
661 | first deflate() call after a deflateInit2() or deflateReset(). bits must be |
||
662 | less than or equal to 16, and that many of the least significant bits of |
||
663 | value will be inserted in the output. |
||
664 | |||
665 | deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source |
||
666 | stream state was inconsistent. |
||
667 | */ |
||
668 | |||
669 | ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, |
||
670 | gz_headerp head)); |
||
671 | /* |
||
672 | deflateSetHeader() provides gzip header information for when a gzip |
||
673 | stream is requested by deflateInit2(). deflateSetHeader() may be called |
||
674 | after deflateInit2() or deflateReset() and before the first call of |
||
675 | deflate(). The text, time, os, extra field, name, and comment information |
||
676 | in the provided gz_header structure are written to the gzip header (xflag is |
||
677 | ignored -- the extra flags are set according to the compression level). The |
||
678 | caller must assure that, if not Z_NULL, name and comment are terminated with |
||
679 | a zero byte, and that if extra is not Z_NULL, that extra_len bytes are |
||
680 | available there. If hcrc is true, a gzip header crc is included. Note that |
||
681 | the current versions of the command-line version of gzip (up through version |
||
682 | 1.3.x) do not support header crc's, and will report that it is a "multi-part |
||
683 | gzip file" and give up. |
||
684 | |||
685 | If deflateSetHeader is not used, the default gzip header has text false, |
||
686 | the time set to zero, and os set to 255, with no extra, name, or comment |
||
687 | fields. The gzip header is returned to the default state by deflateReset(). |
||
688 | |||
689 | deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source |
||
690 | stream state was inconsistent. |
||
691 | */ |
||
692 | |||
693 | /* |
||
694 | ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, |
||
695 | int windowBits)); |
||
696 | |||
697 | This is another version of inflateInit with an extra parameter. The |
||
698 | fields next_in, avail_in, zalloc, zfree and opaque must be initialized |
||
699 | before by the caller. |
||
700 | |||
701 | The windowBits parameter is the base two logarithm of the maximum window |
||
702 | size (the size of the history buffer). It should be in the range 8..15 for |
||
703 | this version of the library. The default value is 15 if inflateInit is used |
||
704 | instead. windowBits must be greater than or equal to the windowBits value |
||
705 | provided to deflateInit2() while compressing, or it must be equal to 15 if |
||
706 | deflateInit2() was not used. If a compressed stream with a larger window |
||
707 | size is given as input, inflate() will return with the error code |
||
708 | Z_DATA_ERROR instead of trying to allocate a larger window. |
||
709 | |||
710 | windowBits can also be -8..-15 for raw inflate. In this case, -windowBits |
||
711 | determines the window size. inflate() will then process raw deflate data, |
||
712 | not looking for a zlib or gzip header, not generating a check value, and not |
||
713 | looking for any check values for comparison at the end of the stream. This |
||
714 | is for use with other formats that use the deflate compressed data format |
||
715 | such as zip. Those formats provide their own check values. If a custom |
||
716 | format is developed using the raw deflate format for compressed data, it is |
||
717 | recommended that a check value such as an adler32 or a crc32 be applied to |
||
718 | the uncompressed data as is done in the zlib, gzip, and zip formats. For |
||
719 | most applications, the zlib format should be used as is. Note that comments |
||
720 | above on the use in deflateInit2() applies to the magnitude of windowBits. |
||
721 | |||
722 | windowBits can also be greater than 15 for optional gzip decoding. Add |
||
723 | 32 to windowBits to enable zlib and gzip decoding with automatic header |
||
724 | detection, or add 16 to decode only the gzip format (the zlib format will |
||
725 | return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is |
||
726 | a crc32 instead of an adler32. |
||
727 | |||
728 | inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
||
729 | memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg |
||
730 | is set to null if there is no error message. inflateInit2 does not perform |
||
731 | any decompression apart from reading the zlib header if present: this will |
||
732 | be done by inflate(). (So next_in and avail_in may be modified, but next_out |
||
733 | and avail_out are unchanged.) |
||
734 | */ |
||
735 | |||
736 | ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, |
||
737 | const Bytef *dictionary, |
||
738 | uInt dictLength)); |
||
739 | /* |
||
740 | Initializes the decompression dictionary from the given uncompressed byte |
||
741 | sequence. This function must be called immediately after a call of inflate, |
||
742 | if that call returned Z_NEED_DICT. The dictionary chosen by the compressor |
||
743 | can be determined from the adler32 value returned by that call of inflate. |
||
744 | The compressor and decompressor must use exactly the same dictionary (see |
||
745 | deflateSetDictionary). For raw inflate, this function can be called |
||
746 | immediately after inflateInit2() or inflateReset() and before any call of |
||
747 | inflate() to set the dictionary. The application must insure that the |
||
748 | dictionary that was used for compression is provided. |
||
749 | |||
750 | inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a |
||
751 | parameter is invalid (such as NULL dictionary) or the stream state is |
||
752 | inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the |
||
753 | expected one (incorrect adler32 value). inflateSetDictionary does not |
||
754 | perform any decompression: this will be done by subsequent calls of |
||
755 | inflate(). |
||
756 | */ |
||
757 | |||
758 | ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); |
||
759 | /* |
||
760 | Skips invalid compressed data until a full flush point (see above the |
||
761 | description of deflate with Z_FULL_FLUSH) can be found, or until all |
||
762 | available input is skipped. No output is provided. |
||
763 | |||
764 | inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR |
||
765 | if no more input was provided, Z_DATA_ERROR if no flush point has been found, |
||
766 | or Z_STREAM_ERROR if the stream structure was inconsistent. In the success |
||
767 | case, the application may save the current current value of total_in which |
||
768 | indicates where valid compressed data was found. In the error case, the |
||
769 | application may repeatedly call inflateSync, providing more input each time, |
||
770 | until success or end of the input data. |
||
771 | */ |
||
772 | |||
773 | ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, |
||
774 | z_streamp source)); |
||
775 | /* |
||
776 | Sets the destination stream as a complete copy of the source stream. |
||
777 | |||
778 | This function can be useful when randomly accessing a large stream. The |
||
779 | first pass through the stream can periodically record the inflate state, |
||
780 | allowing restarting inflate at those points when randomly accessing the |
||
781 | stream. |
||
782 | |||
783 | inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not |
||
784 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent |
||
785 | (such as zalloc being NULL). msg is left unchanged in both source and |
||
786 | destination. |
||
787 | */ |
||
788 | |||
789 | ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); |
||
790 | /* |
||
791 | This function is equivalent to inflateEnd followed by inflateInit, |
||
792 | but does not free and reallocate all the internal decompression state. |
||
793 | The stream will keep attributes that may have been set by inflateInit2. |
||
794 | |||
795 | inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
||
796 | stream state was inconsistent (such as zalloc or state being NULL). |
||
797 | */ |
||
798 | |||
799 | ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm, |
||
800 | int bits, |
||
801 | int value)); |
||
802 | /* |
||
803 | This function inserts bits in the inflate input stream. The intent is |
||
804 | that this function is used to start inflating at a bit position in the |
||
805 | middle of a byte. The provided bits will be used before any bytes are used |
||
806 | from next_in. This function should only be used with raw inflate, and |
||
807 | should be used before the first inflate() call after inflateInit2() or |
||
808 | inflateReset(). bits must be less than or equal to 16, and that many of the |
||
809 | least significant bits of value will be inserted in the input. |
||
810 | |||
811 | inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source |
||
812 | stream state was inconsistent. |
||
813 | */ |
||
814 | |||
815 | ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm, |
||
816 | gz_headerp head)); |
||
817 | /* |
||
818 | inflateGetHeader() requests that gzip header information be stored in the |
||
819 | provided gz_header structure. inflateGetHeader() may be called after |
||
820 | inflateInit2() or inflateReset(), and before the first call of inflate(). |
||
821 | As inflate() processes the gzip stream, head->done is zero until the header |
||
822 | is completed, at which time head->done is set to one. If a zlib stream is |
||
823 | being decoded, then head->done is set to -1 to indicate that there will be |
||
824 | no gzip header information forthcoming. Note that Z_BLOCK can be used to |
||
825 | force inflate() to return immediately after header processing is complete |
||
826 | and before any actual data is decompressed. |
||
827 | |||
828 | The text, time, xflags, and os fields are filled in with the gzip header |
||
829 | contents. hcrc is set to true if there is a header CRC. (The header CRC |
||
830 | was valid if done is set to one.) If extra is not Z_NULL, then extra_max |
||
831 | contains the maximum number of bytes to write to extra. Once done is true, |
||
832 | extra_len contains the actual extra field length, and extra contains the |
||
833 | extra field, or that field truncated if extra_max is less than extra_len. |
||
834 | If name is not Z_NULL, then up to name_max characters are written there, |
||
835 | terminated with a zero unless the length is greater than name_max. If |
||
836 | comment is not Z_NULL, then up to comm_max characters are written there, |
||
837 | terminated with a zero unless the length is greater than comm_max. When |
||
838 | any of extra, name, or comment are not Z_NULL and the respective field is |
||
839 | not present in the header, then that field is set to Z_NULL to signal its |
||
840 | absence. This allows the use of deflateSetHeader() with the returned |
||
841 | structure to duplicate the header. However if those fields are set to |
||
842 | allocated memory, then the application will need to save those pointers |
||
843 | elsewhere so that they can be eventually freed. |
||
844 | |||
845 | If inflateGetHeader is not used, then the header information is simply |
||
846 | discarded. The header is always checked for validity, including the header |
||
847 | CRC if present. inflateReset() will reset the process to discard the header |
||
848 | information. The application would need to call inflateGetHeader() again to |
||
849 | retrieve the header from the next gzip stream. |
||
850 | |||
851 | inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source |
||
852 | stream state was inconsistent. |
||
853 | */ |
||
854 | |||
855 | /* |
||
856 | ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, |
||
857 | unsigned char FAR *window)); |
||
858 | |||
859 | Initialize the internal stream state for decompression using inflateBack() |
||
860 | calls. The fields zalloc, zfree and opaque in strm must be initialized |
||
861 | before the call. If zalloc and zfree are Z_NULL, then the default library- |
||
862 | derived memory allocation routines are used. windowBits is the base two |
||
863 | logarithm of the window size, in the range 8..15. window is a caller |
||
864 | supplied buffer of that size. Except for special applications where it is |
||
865 | assured that deflate was used with small window sizes, windowBits must be 15 |
||
866 | and a 32K byte window must be supplied to be able to decompress general |
||
867 | deflate streams. |
||
868 | |||
869 | See inflateBack() for the usage of these routines. |
||
870 | |||
871 | inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of |
||
872 | the paramaters are invalid, Z_MEM_ERROR if the internal state could not |
||
873 | be allocated, or Z_VERSION_ERROR if the version of the library does not |
||
874 | match the version of the header file. |
||
875 | */ |
||
876 | |||
877 | typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *)); |
||
878 | typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); |
||
879 | |||
880 | ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, |
||
881 | in_func in, void FAR *in_desc, |
||
882 | out_func out, void FAR *out_desc)); |
||
883 | /* |
||
884 | inflateBack() does a raw inflate with a single call using a call-back |
||
885 | interface for input and output. This is more efficient than inflate() for |
||
886 | file i/o applications in that it avoids copying between the output and the |
||
887 | sliding window by simply making the window itself the output buffer. This |
||
888 | function trusts the application to not change the output buffer passed by |
||
889 | the output function, at least until inflateBack() returns. |
||
890 | |||
891 | inflateBackInit() must be called first to allocate the internal state |
||
892 | and to initialize the state with the user-provided window buffer. |
||
893 | inflateBack() may then be used multiple times to inflate a complete, raw |
||
894 | deflate stream with each call. inflateBackEnd() is then called to free |
||
895 | the allocated state. |
||
896 | |||
897 | A raw deflate stream is one with no zlib or gzip header or trailer. |
||
898 | This routine would normally be used in a utility that reads zip or gzip |
||
899 | files and writes out uncompressed files. The utility would decode the |
||
900 | header and process the trailer on its own, hence this routine expects |
||
901 | only the raw deflate stream to decompress. This is different from the |
||
902 | normal behavior of inflate(), which expects either a zlib or gzip header and |
||
903 | trailer around the deflate stream. |
||
904 | |||
905 | inflateBack() uses two subroutines supplied by the caller that are then |
||
906 | called by inflateBack() for input and output. inflateBack() calls those |
||
907 | routines until it reads a complete deflate stream and writes out all of the |
||
908 | uncompressed data, or until it encounters an error. The function's |
||
909 | parameters and return types are defined above in the in_func and out_func |
||
910 | typedefs. inflateBack() will call in(in_desc, &buf) which should return the |
||
911 | number of bytes of provided input, and a pointer to that input in buf. If |
||
912 | there is no input available, in() must return zero--buf is ignored in that |
||
913 | case--and inflateBack() will return a buffer error. inflateBack() will call |
||
914 | out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() |
||
915 | should return zero on success, or non-zero on failure. If out() returns |
||
916 | non-zero, inflateBack() will return with an error. Neither in() nor out() |
||
917 | are permitted to change the contents of the window provided to |
||
918 | inflateBackInit(), which is also the buffer that out() uses to write from. |
||
919 | The length written by out() will be at most the window size. Any non-zero |
||
920 | amount of input may be provided by in(). |
||
921 | |||
922 | For convenience, inflateBack() can be provided input on the first call by |
||
923 | setting strm->next_in and strm->avail_in. If that input is exhausted, then |
||
924 | in() will be called. Therefore strm->next_in must be initialized before |
||
925 | calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called |
||
926 | immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in |
||
927 | must also be initialized, and then if strm->avail_in is not zero, input will |
||
928 | initially be taken from strm->next_in[0 .. strm->avail_in - 1]. |
||
929 | |||
930 | The in_desc and out_desc parameters of inflateBack() is passed as the |
||
931 | first parameter of in() and out() respectively when they are called. These |
||
932 | descriptors can be optionally used to pass any information that the caller- |
||
933 | supplied in() and out() functions need to do their job. |
||
934 | |||
935 | On return, inflateBack() will set strm->next_in and strm->avail_in to |
||
936 | pass back any unused input that was provided by the last in() call. The |
||
937 | return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR |
||
938 | if in() or out() returned an error, Z_DATA_ERROR if there was a format |
||
939 | error in the deflate stream (in which case strm->msg is set to indicate the |
||
940 | nature of the error), or Z_STREAM_ERROR if the stream was not properly |
||
941 | initialized. In the case of Z_BUF_ERROR, an input or output error can be |
||
942 | distinguished using strm->next_in which will be Z_NULL only if in() returned |
||
943 | an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to |
||
944 | out() returning non-zero. (in() will always be called before out(), so |
||
945 | strm->next_in is assured to be defined if out() returns non-zero.) Note |
||
946 | that inflateBack() cannot return Z_OK. |
||
947 | */ |
||
948 | |||
949 | ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); |
||
950 | /* |
||
951 | All memory allocated by inflateBackInit() is freed. |
||
952 | |||
953 | inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream |
||
954 | state was inconsistent. |
||
955 | */ |
||
956 | |||
957 | ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); |
||
958 | /* Return flags indicating compile-time options. |
||
959 | |||
960 | Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: |
||
961 | 1.0: size of uInt |
||
962 | 3.2: size of uLong |
||
963 | 5.4: size of voidpf (pointer) |
||
964 | 7.6: size of z_off_t |
||
965 | |||
966 | Compiler, assembler, and debug options: |
||
967 | 8: DEBUG |
||
968 | 9: ASMV or ASMINF -- use ASM code |
||
969 | 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention |
||
970 | 11: 0 (reserved) |
||
971 | |||
972 | One-time table building (smaller code, but not thread-safe if true): |
||
973 | 12: BUILDFIXED -- build static block decoding tables when needed |
||
974 | 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed |
||
975 | 14,15: 0 (reserved) |
||
976 | |||
977 | Library content (indicates missing functionality): |
||
978 | 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking |
||
979 | deflate code when not needed) |
||
980 | 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect |
||
981 | and decode gzip streams (to avoid linking crc code) |
||
982 | 18-19: 0 (reserved) |
||
983 | |||
984 | Operation variations (changes in library functionality): |
||
985 | 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate |
||
986 | 21: FASTEST -- deflate algorithm with only one, lowest compression level |
||
987 | 22,23: 0 (reserved) |
||
988 | |||
989 | The sprintf variant used by gzprintf (zero is best): |
||
990 | 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format |
||
991 | 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! |
||
992 | 26: 0 = returns value, 1 = void -- 1 means inferred string length returned |
||
993 | |||
994 | Remainder: |
||
995 | 27-31: 0 (reserved) |
||
996 | */ |
||
997 | |||
998 | |||
999 | /* utility functions */ |
||
1000 | |||
1001 | /* |
||
1002 | The following utility functions are implemented on top of the |
||
1003 | basic stream-oriented functions. To simplify the interface, some |
||
1004 | default options are assumed (compression level and memory usage, |
||
1005 | standard memory allocation functions). The source code of these |
||
1006 | utility functions can easily be modified if you need special options. |
||
1007 | */ |
||
1008 | |||
1009 | ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, |
||
1010 | const Bytef *source, uLong sourceLen)); |
||
1011 | /* |
||
1012 | Compresses the source buffer into the destination buffer. sourceLen is |
||
1013 | the byte length of the source buffer. Upon entry, destLen is the total |
||
1014 | size of the destination buffer, which must be at least the value returned |
||
1015 | by compressBound(sourceLen). Upon exit, destLen is the actual size of the |
||
1016 | compressed buffer. |
||
1017 | This function can be used to compress a whole file at once if the |
||
1018 | input file is mmap'ed. |
||
1019 | compress returns Z_OK if success, Z_MEM_ERROR if there was not |
||
1020 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
||
1021 | buffer. |
||
1022 | */ |
||
1023 | |||
1024 | ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, |
||
1025 | const Bytef *source, uLong sourceLen, |
||
1026 | int level)); |
||
1027 | /* |
||
1028 | Compresses the source buffer into the destination buffer. The level |
||
1029 | parameter has the same meaning as in deflateInit. sourceLen is the byte |
||
1030 | length of the source buffer. Upon entry, destLen is the total size of the |
||
1031 | destination buffer, which must be at least the value returned by |
||
1032 | compressBound(sourceLen). Upon exit, destLen is the actual size of the |
||
1033 | compressed buffer. |
||
1034 | |||
1035 | compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
||
1036 | memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
||
1037 | Z_STREAM_ERROR if the level parameter is invalid. |
||
1038 | */ |
||
1039 | |||
1040 | ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); |
||
1041 | /* |
||
1042 | compressBound() returns an upper bound on the compressed size after |
||
1043 | compress() or compress2() on sourceLen bytes. It would be used before |
||
1044 | a compress() or compress2() call to allocate the destination buffer. |
||
1045 | */ |
||
1046 | |||
1047 | ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, |
||
1048 | const Bytef *source, uLong sourceLen)); |
||
1049 | /* |
||
1050 | Decompresses the source buffer into the destination buffer. sourceLen is |
||
1051 | the byte length of the source buffer. Upon entry, destLen is the total |
||
1052 | size of the destination buffer, which must be large enough to hold the |
||
1053 | entire uncompressed data. (The size of the uncompressed data must have |
||
1054 | been saved previously by the compressor and transmitted to the decompressor |
||
1055 | by some mechanism outside the scope of this compression library.) |
||
1056 | Upon exit, destLen is the actual size of the compressed buffer. |
||
1057 | This function can be used to decompress a whole file at once if the |
||
1058 | input file is mmap'ed. |
||
1059 | |||
1060 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
||
1061 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
||
1062 | buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. |
||
1063 | */ |
||
1064 | |||
1065 | |||
1066 | typedef voidp gzFile; |
||
1067 | |||
1068 | ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); |
||
1069 | /* |
||
1070 | Opens a gzip (.gz) file for reading or writing. The mode parameter |
||
1071 | is as in fopen ("rb" or "wb") but can also include a compression level |
||
1072 | ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for |
||
1073 | Huffman only compression as in "wb1h", or 'R' for run-length encoding |
||
1074 | as in "wb1R". (See the description of deflateInit2 for more information |
||
1075 | about the strategy parameter.) |
||
1076 | |||
1077 | gzopen can be used to read a file which is not in gzip format; in this |
||
1078 | case gzread will directly read from the file without decompression. |
||
1079 | |||
1080 | gzopen returns NULL if the file could not be opened or if there was |
||
1081 | insufficient memory to allocate the (de)compression state; errno |
||
1082 | can be checked to distinguish the two cases (if errno is zero, the |
||
1083 | zlib error is Z_MEM_ERROR). */ |
||
1084 | |||
1085 | ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); |
||
1086 | /* |
||
1087 | gzdopen() associates a gzFile with the file descriptor fd. File |
||
1088 | descriptors are obtained from calls like open, dup, creat, pipe or |
||
1089 | fileno (in the file has been previously opened with fopen). |
||
1090 | The mode parameter is as in gzopen. |
||
1091 | The next call of gzclose on the returned gzFile will also close the |
||
1092 | file descriptor fd, just like fclose(fdopen(fd), mode) closes the file |
||
1093 | descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). |
||
1094 | gzdopen returns NULL if there was insufficient memory to allocate |
||
1095 | the (de)compression state. |
||
1096 | */ |
||
1097 | |||
1098 | ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); |
||
1099 | /* |
||
1100 | Dynamically update the compression level or strategy. See the description |
||
1101 | of deflateInit2 for the meaning of these parameters. |
||
1102 | gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not |
||
1103 | opened for writing. |
||
1104 | */ |
||
1105 | |||
1106 | ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); |
||
1107 | /* |
||
1108 | Reads the given number of uncompressed bytes from the compressed file. |
||
1109 | If the input file was not in gzip format, gzread copies the given number |
||
1110 | of bytes into the buffer. |
||
1111 | gzread returns the number of uncompressed bytes actually read (0 for |
||
1112 | end of file, -1 for error). */ |
||
1113 | |||
1114 | ZEXTERN int ZEXPORT gzwrite OF((gzFile file, |
||
1115 | voidpc buf, unsigned len)); |
||
1116 | /* |
||
1117 | Writes the given number of uncompressed bytes into the compressed file. |
||
1118 | gzwrite returns the number of uncompressed bytes actually written |
||
1119 | (0 in case of error). |
||
1120 | */ |
||
1121 | |||
1122 | ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); |
||
1123 | /* |
||
1124 | Converts, formats, and writes the args to the compressed file under |
||
1125 | control of the format string, as in fprintf. gzprintf returns the number of |
||
1126 | uncompressed bytes actually written (0 in case of error). The number of |
||
1127 | uncompressed bytes written is limited to 4095. The caller should assure that |
||
1128 | this limit is not exceeded. If it is exceeded, then gzprintf() will return |
||
1129 | return an error (0) with nothing written. In this case, there may also be a |
||
1130 | buffer overflow with unpredictable consequences, which is possible only if |
||
1131 | zlib was compiled with the insecure functions sprintf() or vsprintf() |
||
1132 | because the secure snprintf() or vsnprintf() functions were not available. |
||
1133 | */ |
||
1134 | |||
1135 | ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); |
||
1136 | /* |
||
1137 | Writes the given null-terminated string to the compressed file, excluding |
||
1138 | the terminating null character. |
||
1139 | gzputs returns the number of characters written, or -1 in case of error. |
||
1140 | */ |
||
1141 | |||
1142 | ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); |
||
1143 | /* |
||
1144 | Reads bytes from the compressed file until len-1 characters are read, or |
||
1145 | a newline character is read and transferred to buf, or an end-of-file |
||
1146 | condition is encountered. The string is then terminated with a null |
||
1147 | character. |
||
1148 | gzgets returns buf, or Z_NULL in case of error. |
||
1149 | */ |
||
1150 | |||
1151 | ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); |
||
1152 | /* |
||
1153 | Writes c, converted to an unsigned char, into the compressed file. |
||
1154 | gzputc returns the value that was written, or -1 in case of error. |
||
1155 | */ |
||
1156 | |||
1157 | ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); |
||
1158 | /* |
||
1159 | Reads one byte from the compressed file. gzgetc returns this byte |
||
1160 | or -1 in case of end of file or error. |
||
1161 | */ |
||
1162 | |||
1163 | ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); |
||
1164 | /* |
||
1165 | Push one character back onto the stream to be read again later. |
||
1166 | Only one character of push-back is allowed. gzungetc() returns the |
||
1167 | character pushed, or -1 on failure. gzungetc() will fail if a |
||
1168 | character has been pushed but not read yet, or if c is -1. The pushed |
||
1169 | character will be discarded if the stream is repositioned with gzseek() |
||
1170 | or gzrewind(). |
||
1171 | */ |
||
1172 | |||
1173 | ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); |
||
1174 | /* |
||
1175 | Flushes all pending output into the compressed file. The parameter |
||
1176 | flush is as in the deflate() function. The return value is the zlib |
||
1177 | error number (see function gzerror below). gzflush returns Z_OK if |
||
1178 | the flush parameter is Z_FINISH and all output could be flushed. |
||
1179 | gzflush should be called only when strictly necessary because it can |
||
1180 | degrade compression. |
||
1181 | */ |
||
1182 | |||
1183 | ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, |
||
1184 | z_off_t offset, int whence)); |
||
1185 | /* |
||
1186 | Sets the starting position for the next gzread or gzwrite on the |
||
1187 | given compressed file. The offset represents a number of bytes in the |
||
1188 | uncompressed data stream. The whence parameter is defined as in lseek(2); |
||
1189 | the value SEEK_END is not supported. |
||
1190 | If the file is opened for reading, this function is emulated but can be |
||
1191 | extremely slow. If the file is opened for writing, only forward seeks are |
||
1192 | supported; gzseek then compresses a sequence of zeroes up to the new |
||
1193 | starting position. |
||
1194 | |||
1195 | gzseek returns the resulting offset location as measured in bytes from |
||
1196 | the beginning of the uncompressed stream, or -1 in case of error, in |
||
1197 | particular if the file is opened for writing and the new starting position |
||
1198 | would be before the current position. |
||
1199 | */ |
||
1200 | |||
1201 | ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); |
||
1202 | /* |
||
1203 | Rewinds the given file. This function is supported only for reading. |
||
1204 | |||
1205 | gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) |
||
1206 | */ |
||
1207 | |||
1208 | ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); |
||
1209 | /* |
||
1210 | Returns the starting position for the next gzread or gzwrite on the |
||
1211 | given compressed file. This position represents a number of bytes in the |
||
1212 | uncompressed data stream. |
||
1213 | |||
1214 | gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) |
||
1215 | */ |
||
1216 | |||
1217 | ZEXTERN int ZEXPORT gzeof OF((gzFile file)); |
||
1218 | /* |
||
1219 | Returns 1 when EOF has previously been detected reading the given |
||
1220 | input stream, otherwise zero. |
||
1221 | */ |
||
1222 | |||
1223 | ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); |
||
1224 | /* |
||
1225 | Returns 1 if file is being read directly without decompression, otherwise |
||
1226 | zero. |
||
1227 | */ |
||
1228 | |||
1229 | ZEXTERN int ZEXPORT gzclose OF((gzFile file)); |
||
1230 | /* |
||
1231 | Flushes all pending output if necessary, closes the compressed file |
||
1232 | and deallocates all the (de)compression state. The return value is the zlib |
||
1233 | error number (see function gzerror below). |
||
1234 | */ |
||
1235 | |||
1236 | ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); |
||
1237 | /* |
||
1238 | Returns the error message for the last error which occurred on the |
||
1239 | given compressed file. errnum is set to zlib error number. If an |
||
1240 | error occurred in the file system and not in the compression library, |
||
1241 | errnum is set to Z_ERRNO and the application may consult errno |
||
1242 | to get the exact error code. |
||
1243 | */ |
||
1244 | |||
1245 | ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); |
||
1246 | /* |
||
1247 | Clears the error and end-of-file flags for file. This is analogous to the |
||
1248 | clearerr() function in stdio. This is useful for continuing to read a gzip |
||
1249 | file that is being written concurrently. |
||
1250 | */ |
||
1251 | |||
1252 | /* checksum functions */ |
||
1253 | |||
1254 | /* |
||
1255 | These functions are not related to compression but are exported |
||
1256 | anyway because they might be useful in applications using the |
||
1257 | compression library. |
||
1258 | */ |
||
1259 | |||
1260 | ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); |
||
1261 | /* |
||
1262 | Update a running Adler-32 checksum with the bytes buf[0..len-1] and |
||
1263 | return the updated checksum. If buf is NULL, this function returns |
||
1264 | the required initial value for the checksum. |
||
1265 | An Adler-32 checksum is almost as reliable as a CRC32 but can be computed |
||
1266 | much faster. Usage example: |
||
1267 | |||
1268 | uLong adler = adler32(0L, Z_NULL, 0); |
||
1269 | |||
1270 | while (read_buffer(buffer, length) != EOF) { |
||
1271 | adler = adler32(adler, buffer, length); |
||
1272 | } |
||
1273 | if (adler != original_adler) error(); |
||
1274 | */ |
||
1275 | |||
1276 | ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, |
||
1277 | z_off_t len2)); |
||
1278 | /* |
||
1279 | Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 |
||
1280 | and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for |
||
1281 | each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of |
||
1282 | seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. |
||
1283 | */ |
||
1284 | |||
1285 | ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); |
||
1286 | /* |
||
1287 | Update a running CRC-32 with the bytes buf[0..len-1] and return the |
||
1288 | updated CRC-32. If buf is NULL, this function returns the required initial |
||
1289 | value for the for the crc. Pre- and post-conditioning (one's complement) is |
||
1290 | performed within this function so it shouldn't be done by the application. |
||
1291 | Usage example: |
||
1292 | |||
1293 | uLong crc = crc32(0L, Z_NULL, 0); |
||
1294 | |||
1295 | while (read_buffer(buffer, length) != EOF) { |
||
1296 | crc = crc32(crc, buffer, length); |
||
1297 | } |
||
1298 | if (crc != original_crc) error(); |
||
1299 | */ |
||
1300 | |||
1301 | ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); |
||
1302 | |||
1303 | /* |
||
1304 | Combine two CRC-32 check values into one. For two sequences of bytes, |
||
1305 | seq1 and seq2 with lengths len1 and len2, CRC-32 check values were |
||
1306 | calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 |
||
1307 | check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and |
||
1308 | len2. |
||
1309 | */ |
||
1310 | |||
1311 | |||
1312 | /* various hacks, don't look :) */ |
||
1313 | |||
1314 | /* deflateInit and inflateInit are macros to allow checking the zlib version |
||
1315 | * and the compiler's view of z_stream: |
||
1316 | */ |
||
1317 | ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, |
||
1318 | const char *version, int stream_size)); |
||
1319 | ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, |
||
1320 | const char *version, int stream_size)); |
||
1321 | ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, |
||
1322 | int windowBits, int memLevel, |
||
1323 | int strategy, const char *version, |
||
1324 | int stream_size)); |
||
1325 | ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, |
||
1326 | const char *version, int stream_size)); |
||
1327 | ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, |
||
1328 | unsigned char FAR *window, |
||
1329 | const char *version, |
||
1330 | int stream_size)); |
||
1331 | #define deflateInit(strm, level) \ |
||
1332 | deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) |
||
1333 | #define inflateInit(strm) \ |
||
1334 | inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) |
||
1335 | #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ |
||
1336 | deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ |
||
1337 | (strategy), ZLIB_VERSION, sizeof(z_stream)) |
||
1338 | #define inflateInit2(strm, windowBits) \ |
||
1339 | inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) |
||
1340 | #define inflateBackInit(strm, windowBits, window) \ |
||
1341 | inflateBackInit_((strm), (windowBits), (window), \ |
||
1342 | ZLIB_VERSION, sizeof(z_stream)) |
||
1343 | |||
1344 | |||
1345 | #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) |
||
1346 | struct internal_state {int dummy;}; /* hack for buggy compilers */ |
||
1347 | #endif |
||
1348 | |||
1349 | ZEXTERN const char * ZEXPORT zError OF((int)); |
||
1350 | ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); |
||
1351 | ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); |
||
1352 | |||
1353 | #ifdef __cplusplus |
||
1354 | } |
||
1355 | #endif |
||
1356 | |||
1357 | #endif /* ZLIB_H */ |