1 | /* zlib.h -- interface of the 'zlib' general purpose compression library |
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2 | version 1.1.3, July 9th, 1998 |
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3 | |
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4 | Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler |
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5 | |
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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 | |
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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 | |
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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 | |
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22 | Jean-loup Gailly Mark Adler |
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23 | jloup@gzip.org madler@alumni.caltech.edu |
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24 | |
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25 | |
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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 ftp://ds.internic.net/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 | |
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31 | #ifndef _ZLIB_H |
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32 | #define _ZLIB_H |
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33 | |
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34 | #include "zconf.h" |
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35 | |
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36 | #ifdef __cplusplus |
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37 | extern "C" { |
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38 | #endif |
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39 | |
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40 | #define ZLIB_VERSION "1.1.3" |
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41 | |
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42 | /* |
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43 | The 'zlib' compression library provides in-memory compression and |
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44 | decompression functions, including integrity checks of the uncompressed |
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45 | data. This version of the library supports only one compression method |
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46 | (deflation) but other algorithms will be added later and will have the same |
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47 | stream interface. |
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48 | |
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49 | Compression can be done in a single step if the buffers are large |
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50 | enough (for example if an input file is mmap'ed), or can be done by |
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51 | repeated calls of the compression function. In the latter case, the |
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52 | application must provide more input and/or consume the output |
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53 | (providing more output space) before each call. |
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54 | |
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55 | The library also supports reading and writing files in gzip (.gz) format |
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56 | with an interface similar to that of stdio. |
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57 | |
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58 | The library does not install any signal handler. The decoder checks |
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59 | the consistency of the compressed data, so the library should never |
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60 | crash even in case of corrupted input. |
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61 | */ |
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62 | |
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63 | typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); |
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64 | typedef void (*free_func) OF((voidpf opaque, voidpf address)); |
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65 | |
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66 | struct internal_state; |
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67 | |
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68 | typedef struct z_stream_s { |
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69 | Bytef *next_in; /* next input byte */ |
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70 | uInt avail_in; /* number of bytes available at next_in */ |
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71 | uLong total_in; /* total nb of input bytes read so far */ |
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72 | |
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73 | Bytef *next_out; /* next output byte should be put there */ |
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74 | uInt avail_out; /* remaining free space at next_out */ |
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75 | uLong total_out; /* total nb of bytes output so far */ |
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76 | |
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77 | char *msg; /* last error message, NULL if no error */ |
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78 | struct internal_state FAR *state; /* not visible by applications */ |
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79 | |
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80 | alloc_func zalloc; /* used to allocate the internal state */ |
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81 | free_func zfree; /* used to free the internal state */ |
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82 | voidpf opaque; /* private data object passed to zalloc and zfree */ |
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83 | |
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84 | int data_type; /* best guess about the data type: ascii or binary */ |
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85 | uLong adler; /* adler32 value of the uncompressed data */ |
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86 | uLong reserved; /* reserved for future use */ |
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87 | } z_stream; |
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88 | |
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89 | typedef z_stream FAR *z_streamp; |
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90 | |
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91 | /* |
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92 | The application must update next_in and avail_in when avail_in has |
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93 | dropped to zero. It must update next_out and avail_out when avail_out |
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94 | has dropped to zero. The application must initialize zalloc, zfree and |
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95 | opaque before calling the init function. All other fields are set by the |
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96 | compression library and must not be updated by the application. |
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97 | |
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98 | The opaque value provided by the application will be passed as the first |
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99 | parameter for calls of zalloc and zfree. This can be useful for custom |
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100 | memory management. The compression library attaches no meaning to the |
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101 | opaque value. |
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102 | |
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103 | zalloc must return Z_NULL if there is not enough memory for the object. |
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104 | If zlib is used in a multi-threaded application, zalloc and zfree must be |
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105 | thread safe. |
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106 | |
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107 | On 16-bit systems, the functions zalloc and zfree must be able to allocate |
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108 | exactly 65536 bytes, but will not be required to allocate more than this |
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109 | if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, |
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110 | pointers returned by zalloc for objects of exactly 65536 bytes *must* |
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111 | have their offset normalized to zero. The default allocation function |
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112 | provided by this library ensures this (see zutil.c). To reduce memory |
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113 | requirements and avoid any allocation of 64K objects, at the expense of |
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114 | compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). |
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115 | |
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116 | The fields total_in and total_out can be used for statistics or |
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117 | progress reports. After compression, total_in holds the total size of |
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118 | the uncompressed data and may be saved for use in the decompressor |
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119 | (particularly if the decompressor wants to decompress everything in |
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120 | a single step). |
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121 | */ |
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122 | |
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123 | /* constants */ |
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124 | |
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125 | #define Z_NO_FLUSH 0 |
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126 | #define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ |
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127 | #define Z_SYNC_FLUSH 2 |
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128 | #define Z_FULL_FLUSH 3 |
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129 | #define Z_FINISH 4 |
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130 | /* Allowed flush values; see deflate() below for details */ |
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131 | |
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132 | #define Z_OK 0 |
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133 | #define Z_STREAM_END 1 |
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134 | #define Z_NEED_DICT 2 |
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135 | #define Z_ERRNO (-1) |
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136 | #define Z_STREAM_ERROR (-2) |
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137 | #define Z_DATA_ERROR (-3) |
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138 | #define Z_MEM_ERROR (-4) |
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139 | #define Z_BUF_ERROR (-5) |
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140 | #define Z_VERSION_ERROR (-6) |
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141 | /* Return codes for the compression/decompression functions. Negative |
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142 | * values are errors, positive values are used for special but normal events. |
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143 | */ |
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144 | |
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145 | #define Z_NO_COMPRESSION 0 |
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146 | #define Z_BEST_SPEED 1 |
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147 | #define Z_BEST_COMPRESSION 9 |
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148 | #define Z_DEFAULT_COMPRESSION (-1) |
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149 | /* compression levels */ |
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150 | |
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151 | #define Z_FILTERED 1 |
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152 | #define Z_HUFFMAN_ONLY 2 |
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153 | #define Z_DEFAULT_STRATEGY 0 |
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154 | /* compression strategy; see deflateInit2() below for details */ |
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155 | |
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156 | #define Z_BINARY 0 |
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157 | #define Z_ASCII 1 |
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158 | #define Z_UNKNOWN 2 |
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159 | /* Possible values of the data_type field */ |
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160 | |
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161 | #define Z_DEFLATED 8 |
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162 | /* The deflate compression method (the only one supported in this version) */ |
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163 | |
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164 | #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ |
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165 | |
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166 | #define zlib_version zlibVersion() |
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167 | /* for compatibility with versions < 1.0.2 */ |
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168 | |
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169 | /* basic functions */ |
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170 | |
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171 | ZEXTERN const char * ZEXPORT zlibVersion OF((void)); |
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172 | /* The application can compare zlibVersion and ZLIB_VERSION for consistency. |
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173 | If the first character differs, the library code actually used is |
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174 | not compatible with the zlib.h header file used by the application. |
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175 | This check is automatically made by deflateInit and inflateInit. |
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176 | */ |
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177 | |
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178 | /* |
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179 | ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); |
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180 | |
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181 | Initializes the internal stream state for compression. The fields |
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182 | zalloc, zfree and opaque must be initialized before by the caller. |
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183 | If zalloc and zfree are set to Z_NULL, deflateInit updates them to |
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184 | use default allocation functions. |
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185 | |
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186 | The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: |
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187 | 1 gives best speed, 9 gives best compression, 0 gives no compression at |
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188 | all (the input data is simply copied a block at a time). |
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189 | Z_DEFAULT_COMPRESSION requests a default compromise between speed and |
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190 | compression (currently equivalent to level 6). |
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191 | |
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192 | deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not |
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193 | enough memory, Z_STREAM_ERROR if level is not a valid compression level, |
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194 | Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible |
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195 | with the version assumed by the caller (ZLIB_VERSION). |
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196 | msg is set to null if there is no error message. deflateInit does not |
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197 | perform any compression: this will be done by deflate(). |
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198 | */ |
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199 | |
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200 | |
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201 | ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); |
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202 | /* |
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203 | deflate compresses as much data as possible, and stops when the input |
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204 | buffer becomes empty or the output buffer becomes full. It may introduce some |
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205 | output latency (reading input without producing any output) except when |
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206 | forced to flush. |
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207 | |
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208 | The detailed semantics are as follows. deflate performs one or both of the |
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209 | following actions: |
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210 | |
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211 | - Compress more input starting at next_in and update next_in and avail_in |
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212 | accordingly. If not all input can be processed (because there is not |
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213 | enough room in the output buffer), next_in and avail_in are updated and |
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214 | processing will resume at this point for the next call of deflate(). |
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215 | |
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216 | - Provide more output starting at next_out and update next_out and avail_out |
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217 | accordingly. This action is forced if the parameter flush is non zero. |
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218 | Forcing flush frequently degrades the compression ratio, so this parameter |
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219 | should be set only when necessary (in interactive applications). |
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220 | Some output may be provided even if flush is not set. |
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221 | |
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222 | Before the call of deflate(), the application should ensure that at least |
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223 | one of the actions is possible, by providing more input and/or consuming |
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224 | more output, and updating avail_in or avail_out accordingly; avail_out |
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225 | should never be zero before the call. The application can consume the |
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226 | compressed output when it wants, for example when the output buffer is full |
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227 | (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK |
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228 | and with zero avail_out, it must be called again after making room in the |
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229 | output buffer because there might be more output pending. |
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230 | |
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231 | If the parameter flush is set to Z_SYNC_FLUSH, all pending output is |
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232 | flushed to the output buffer and the output is aligned on a byte boundary, so |
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233 | that the decompressor can get all input data available so far. (In particular |
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234 | avail_in is zero after the call if enough output space has been provided |
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235 | before the call.) Flushing may degrade compression for some compression |
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236 | algorithms and so it should be used only when necessary. |
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237 | |
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238 | If flush is set to Z_FULL_FLUSH, all output is flushed as with |
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239 | Z_SYNC_FLUSH, and the compression state is reset so that decompression can |
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240 | restart from this point if previous compressed data has been damaged or if |
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241 | random access is desired. Using Z_FULL_FLUSH too often can seriously degrade |
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242 | the compression. |
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243 | |
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244 | If deflate returns with avail_out == 0, this function must be called again |
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245 | with the same value of the flush parameter and more output space (updated |
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246 | avail_out), until the flush is complete (deflate returns with non-zero |
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247 | avail_out). |
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248 | |
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249 | If the parameter flush is set to Z_FINISH, pending input is processed, |
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250 | pending output is flushed and deflate returns with Z_STREAM_END if there |
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251 | was enough output space; if deflate returns with Z_OK, this function must be |
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252 | called again with Z_FINISH and more output space (updated avail_out) but no |
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253 | more input data, until it returns with Z_STREAM_END or an error. After |
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254 | deflate has returned Z_STREAM_END, the only possible operations on the |
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255 | stream are deflateReset or deflateEnd. |
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256 | |
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257 | Z_FINISH can be used immediately after deflateInit if all the compression |
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258 | is to be done in a single step. In this case, avail_out must be at least |
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259 | 0.1% larger than avail_in plus 12 bytes. If deflate does not return |
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260 | Z_STREAM_END, then it must be called again as described above. |
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261 | |
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262 | deflate() sets strm->adler to the adler32 checksum of all input read |
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263 | so far (that is, total_in bytes). |
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264 | |
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265 | deflate() may update data_type if it can make a good guess about |
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266 | the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered |
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267 | binary. This field is only for information purposes and does not affect |
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268 | the compression algorithm in any manner. |
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269 | |
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270 | deflate() returns Z_OK if some progress has been made (more input |
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271 | processed or more output produced), Z_STREAM_END if all input has been |
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272 | consumed and all output has been produced (only when flush is set to |
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273 | Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example |
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274 | if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible |
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275 | (for example avail_in or avail_out was zero). |
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276 | */ |
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277 | |
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278 | |
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279 | ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); |
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280 | /* |
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281 | All dynamically allocated data structures for this stream are freed. |
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282 | This function discards any unprocessed input and does not flush any |
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283 | pending output. |
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284 | |
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285 | deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the |
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286 | stream state was inconsistent, Z_DATA_ERROR if the stream was freed |
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287 | prematurely (some input or output was discarded). In the error case, |
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288 | msg may be set but then points to a static string (which must not be |
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289 | deallocated). |
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290 | */ |
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291 | |
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292 | |
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293 | /* |
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294 | ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); |
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295 | |
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296 | Initializes the internal stream state for decompression. The fields |
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297 | next_in, avail_in, zalloc, zfree and opaque must be initialized before by |
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298 | the caller. If next_in is not Z_NULL and avail_in is large enough (the exact |
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299 | value depends on the compression method), inflateInit determines the |
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300 | compression method from the zlib header and allocates all data structures |
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301 | accordingly; otherwise the allocation will be deferred to the first call of |
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302 | inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to |
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303 | use default allocation functions. |
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304 | |
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305 | inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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306 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
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307 | version assumed by the caller. msg is set to null if there is no error |
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308 | message. inflateInit does not perform any decompression apart from reading |
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309 | the zlib header if present: this will be done by inflate(). (So next_in and |
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310 | avail_in may be modified, but next_out and avail_out are unchanged.) |
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311 | */ |
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312 | |
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313 | |
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314 | ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); |
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315 | /* |
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316 | inflate decompresses as much data as possible, and stops when the input |
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317 | buffer becomes empty or the output buffer becomes full. It may some |
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318 | introduce some output latency (reading input without producing any output) |
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319 | except when forced to flush. |
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320 | |
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321 | The detailed semantics are as follows. inflate performs one or both of the |
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322 | following actions: |
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323 | |
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324 | - Decompress more input starting at next_in and update next_in and avail_in |
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325 | accordingly. If not all input can be processed (because there is not |
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326 | enough room in the output buffer), next_in is updated and processing |
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327 | will resume at this point for the next call of inflate(). |
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328 | |
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329 | - Provide more output starting at next_out and update next_out and avail_out |
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330 | accordingly. inflate() provides as much output as possible, until there |
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331 | is no more input data or no more space in the output buffer (see below |
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332 | about the flush parameter). |
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333 | |
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334 | Before the call of inflate(), the application should ensure that at least |
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335 | one of the actions is possible, by providing more input and/or consuming |
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336 | more output, and updating the next_* and avail_* values accordingly. |
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337 | The application can consume the uncompressed output when it wants, for |
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338 | example when the output buffer is full (avail_out == 0), or after each |
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339 | call of inflate(). If inflate returns Z_OK and with zero avail_out, it |
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340 | must be called again after making room in the output buffer because there |
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341 | might be more output pending. |
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342 | |
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343 | If the parameter flush is set to Z_SYNC_FLUSH, inflate flushes as much |
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344 | output as possible to the output buffer. The flushing behavior of inflate is |
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345 | not specified for values of the flush parameter other than Z_SYNC_FLUSH |
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346 | and Z_FINISH, but the current implementation actually flushes as much output |
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347 | as possible anyway. |
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348 | |
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349 | inflate() should normally be called until it returns Z_STREAM_END or an |
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350 | error. However if all decompression is to be performed in a single step |
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351 | (a single call of inflate), the parameter flush should be set to |
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352 | Z_FINISH. In this case all pending input is processed and all pending |
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353 | output is flushed; avail_out must be large enough to hold all the |
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354 | uncompressed data. (The size of the uncompressed data may have been saved |
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355 | by the compressor for this purpose.) The next operation on this stream must |
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356 | be inflateEnd to deallocate the decompression state. The use of Z_FINISH |
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357 | is never required, but can be used to inform inflate that a faster routine |
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358 | may be used for the single inflate() call. |
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359 | |
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360 | If a preset dictionary is needed at this point (see inflateSetDictionary |
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361 | below), inflate sets strm-adler to the adler32 checksum of the |
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362 | dictionary chosen by the compressor and returns Z_NEED_DICT; otherwise |
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363 | it sets strm->adler to the adler32 checksum of all output produced |
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364 | so far (that is, total_out bytes) and returns Z_OK, Z_STREAM_END or |
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365 | an error code as described below. At the end of the stream, inflate() |
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366 | checks that its computed adler32 checksum is equal to that saved by the |
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367 | compressor and returns Z_STREAM_END only if the checksum is correct. |
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368 | |
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369 | inflate() returns Z_OK if some progress has been made (more input processed |
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370 | or more output produced), Z_STREAM_END if the end of the compressed data has |
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371 | been reached and all uncompressed output has been produced, Z_NEED_DICT if a |
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372 | preset dictionary is needed at this point, Z_DATA_ERROR if the input data was |
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373 | corrupted (input stream not conforming to the zlib format or incorrect |
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374 | adler32 checksum), Z_STREAM_ERROR if the stream structure was inconsistent |
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375 | (for example if next_in or next_out was NULL), Z_MEM_ERROR if there was not |
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376 | enough memory, Z_BUF_ERROR if no progress is possible or if there was not |
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377 | enough room in the output buffer when Z_FINISH is used. In the Z_DATA_ERROR |
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378 | case, the application may then call inflateSync to look for a good |
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379 | compression block. |
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380 | */ |
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381 | |
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382 | |
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383 | ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); |
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384 | /* |
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385 | All dynamically allocated data structures for this stream are freed. |
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386 | This function discards any unprocessed input and does not flush any |
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387 | pending output. |
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388 | |
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389 | inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state |
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390 | was inconsistent. In the error case, msg may be set but then points to a |
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391 | static string (which must not be deallocated). |
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392 | */ |
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393 | |
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394 | /* Advanced functions */ |
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395 | |
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396 | /* |
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397 | The following functions are needed only in some special applications. |
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398 | */ |
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399 | |
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400 | /* |
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401 | ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, |
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402 | int level, |
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403 | int method, |
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404 | int windowBits, |
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405 | int memLevel, |
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406 | int strategy)); |
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407 | |
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408 | This is another version of deflateInit with more compression options. The |
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409 | fields next_in, zalloc, zfree and opaque must be initialized before by |
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410 | the caller. |
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411 | |
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412 | The method parameter is the compression method. It must be Z_DEFLATED in |
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413 | this version of the library. |
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414 | |
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415 | The windowBits parameter is the base two logarithm of the window size |
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416 | (the size of the history buffer). It should be in the range 8..15 for this |
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417 | version of the library. Larger values of this parameter result in better |
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418 | compression at the expense of memory usage. The default value is 15 if |
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419 | deflateInit is used instead. |
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420 | |
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421 | The memLevel parameter specifies how much memory should be allocated |
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422 | for the internal compression state. memLevel=1 uses minimum memory but |
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423 | is slow and reduces compression ratio; memLevel=9 uses maximum memory |
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424 | for optimal speed. The default value is 8. See zconf.h for total memory |
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425 | usage as a function of windowBits and memLevel. |
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426 | |
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427 | The strategy parameter is used to tune the compression algorithm. Use the |
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428 | value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a |
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429 | filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman encoding only (no |
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430 | string match). Filtered data consists mostly of small values with a |
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431 | somewhat random distribution. In this case, the compression algorithm is |
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432 | tuned to compress them better. The effect of Z_FILTERED is to force more |
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433 | Huffman coding and less string matching; it is somewhat intermediate |
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434 | between Z_DEFAULT and Z_HUFFMAN_ONLY. The strategy parameter only affects |
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435 | the compression ratio but not the correctness of the compressed output even |
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436 | if it is not set appropriately. |
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437 | |
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438 | deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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439 | memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid |
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440 | method). msg is set to null if there is no error message. deflateInit2 does |
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441 | not perform any compression: this will be done by deflate(). |
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442 | */ |
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443 | |
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444 | ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, |
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445 | const Bytef *dictionary, |
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446 | uInt dictLength)); |
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447 | /* |
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448 | Initializes the compression dictionary from the given byte sequence |
---|
449 | without producing any compressed output. This function must be called |
---|
450 | immediately after deflateInit, deflateInit2 or deflateReset, before any |
---|
451 | call of deflate. The compressor and decompressor must use exactly the same |
---|
452 | dictionary (see inflateSetDictionary). |
---|
453 | |
---|
454 | The dictionary should consist of strings (byte sequences) that are likely |
---|
455 | to be encountered later in the data to be compressed, with the most commonly |
---|
456 | used strings preferably put towards the end of the dictionary. Using a |
---|
457 | dictionary is most useful when the data to be compressed is short and can be |
---|
458 | predicted with good accuracy; the data can then be compressed better than |
---|
459 | with the default empty dictionary. |
---|
460 | |
---|
461 | Depending on the size of the compression data structures selected by |
---|
462 | deflateInit or deflateInit2, a part of the dictionary may in effect be |
---|
463 | discarded, for example if the dictionary is larger than the window size in |
---|
464 | deflate or deflate2. Thus the strings most likely to be useful should be |
---|
465 | put at the end of the dictionary, not at the front. |
---|
466 | |
---|
467 | Upon return of this function, strm->adler is set to the Adler32 value |
---|
468 | of the dictionary; the decompressor may later use this value to determine |
---|
469 | which dictionary has been used by the compressor. (The Adler32 value |
---|
470 | applies to the whole dictionary even if only a subset of the dictionary is |
---|
471 | actually used by the compressor.) |
---|
472 | |
---|
473 | deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a |
---|
474 | parameter is invalid (such as NULL dictionary) or the stream state is |
---|
475 | inconsistent (for example if deflate has already been called for this stream |
---|
476 | or if the compression method is bsort). deflateSetDictionary does not |
---|
477 | perform any compression: this will be done by deflate(). |
---|
478 | */ |
---|
479 | |
---|
480 | ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, |
---|
481 | z_streamp source)); |
---|
482 | /* |
---|
483 | Sets the destination stream as a complete copy of the source stream. |
---|
484 | |
---|
485 | This function can be useful when several compression strategies will be |
---|
486 | tried, for example when there are several ways of pre-processing the input |
---|
487 | data with a filter. The streams that will be discarded should then be freed |
---|
488 | by calling deflateEnd. Note that deflateCopy duplicates the internal |
---|
489 | compression state which can be quite large, so this strategy is slow and |
---|
490 | can consume lots of memory. |
---|
491 | |
---|
492 | deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not |
---|
493 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent |
---|
494 | (such as zalloc being NULL). msg is left unchanged in both source and |
---|
495 | destination. |
---|
496 | */ |
---|
497 | |
---|
498 | ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); |
---|
499 | /* |
---|
500 | This function is equivalent to deflateEnd followed by deflateInit, |
---|
501 | but does not free and reallocate all the internal compression state. |
---|
502 | The stream will keep the same compression level and any other attributes |
---|
503 | that may have been set by deflateInit2. |
---|
504 | |
---|
505 | deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
---|
506 | stream state was inconsistent (such as zalloc or state being NULL). |
---|
507 | */ |
---|
508 | |
---|
509 | ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, |
---|
510 | int level, |
---|
511 | int strategy)); |
---|
512 | /* |
---|
513 | Dynamically update the compression level and compression strategy. The |
---|
514 | interpretation of level and strategy is as in deflateInit2. This can be |
---|
515 | used to switch between compression and straight copy of the input data, or |
---|
516 | to switch to a different kind of input data requiring a different |
---|
517 | strategy. If the compression level is changed, the input available so far |
---|
518 | is compressed with the old level (and may be flushed); the new level will |
---|
519 | take effect only at the next call of deflate(). |
---|
520 | |
---|
521 | Before the call of deflateParams, the stream state must be set as for |
---|
522 | a call of deflate(), since the currently available input may have to |
---|
523 | be compressed and flushed. In particular, strm->avail_out must be non-zero. |
---|
524 | |
---|
525 | deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source |
---|
526 | stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR |
---|
527 | if strm->avail_out was zero. |
---|
528 | */ |
---|
529 | |
---|
530 | /* |
---|
531 | ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, |
---|
532 | int windowBits)); |
---|
533 | |
---|
534 | This is another version of inflateInit with an extra parameter. The |
---|
535 | fields next_in, avail_in, zalloc, zfree and opaque must be initialized |
---|
536 | before by the caller. |
---|
537 | |
---|
538 | The windowBits parameter is the base two logarithm of the maximum window |
---|
539 | size (the size of the history buffer). It should be in the range 8..15 for |
---|
540 | this version of the library. The default value is 15 if inflateInit is used |
---|
541 | instead. If a compressed stream with a larger window size is given as |
---|
542 | input, inflate() will return with the error code Z_DATA_ERROR instead of |
---|
543 | trying to allocate a larger window. |
---|
544 | |
---|
545 | inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
---|
546 | memory, Z_STREAM_ERROR if a parameter is invalid (such as a negative |
---|
547 | memLevel). msg is set to null if there is no error message. inflateInit2 |
---|
548 | does not perform any decompression apart from reading the zlib header if |
---|
549 | present: this will be done by inflate(). (So next_in and avail_in may be |
---|
550 | modified, but next_out and avail_out are unchanged.) |
---|
551 | */ |
---|
552 | |
---|
553 | ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, |
---|
554 | const Bytef *dictionary, |
---|
555 | uInt dictLength)); |
---|
556 | /* |
---|
557 | Initializes the decompression dictionary from the given uncompressed byte |
---|
558 | sequence. This function must be called immediately after a call of inflate |
---|
559 | if this call returned Z_NEED_DICT. The dictionary chosen by the compressor |
---|
560 | can be determined from the Adler32 value returned by this call of |
---|
561 | inflate. The compressor and decompressor must use exactly the same |
---|
562 | dictionary (see deflateSetDictionary). |
---|
563 | |
---|
564 | inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a |
---|
565 | parameter is invalid (such as NULL dictionary) or the stream state is |
---|
566 | inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the |
---|
567 | expected one (incorrect Adler32 value). inflateSetDictionary does not |
---|
568 | perform any decompression: this will be done by subsequent calls of |
---|
569 | inflate(). |
---|
570 | */ |
---|
571 | |
---|
572 | ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); |
---|
573 | /* |
---|
574 | Skips invalid compressed data until a full flush point (see above the |
---|
575 | description of deflate with Z_FULL_FLUSH) can be found, or until all |
---|
576 | available input is skipped. No output is provided. |
---|
577 | |
---|
578 | inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR |
---|
579 | if no more input was provided, Z_DATA_ERROR if no flush point has been found, |
---|
580 | or Z_STREAM_ERROR if the stream structure was inconsistent. In the success |
---|
581 | case, the application may save the current current value of total_in which |
---|
582 | indicates where valid compressed data was found. In the error case, the |
---|
583 | application may repeatedly call inflateSync, providing more input each time, |
---|
584 | until success or end of the input data. |
---|
585 | */ |
---|
586 | |
---|
587 | ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); |
---|
588 | /* |
---|
589 | This function is equivalent to inflateEnd followed by inflateInit, |
---|
590 | but does not free and reallocate all the internal decompression state. |
---|
591 | The stream will keep attributes that may have been set by inflateInit2. |
---|
592 | |
---|
593 | inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
---|
594 | stream state was inconsistent (such as zalloc or state being NULL). |
---|
595 | */ |
---|
596 | |
---|
597 | |
---|
598 | /* utility functions */ |
---|
599 | |
---|
600 | /* |
---|
601 | The following utility functions are implemented on top of the |
---|
602 | basic stream-oriented functions. To simplify the interface, some |
---|
603 | default options are assumed (compression level and memory usage, |
---|
604 | standard memory allocation functions). The source code of these |
---|
605 | utility functions can easily be modified if you need special options. |
---|
606 | */ |
---|
607 | |
---|
608 | ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, |
---|
609 | const Bytef *source, uLong sourceLen)); |
---|
610 | /* |
---|
611 | Compresses the source buffer into the destination buffer. sourceLen is |
---|
612 | the byte length of the source buffer. Upon entry, destLen is the total |
---|
613 | size of the destination buffer, which must be at least 0.1% larger than |
---|
614 | sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the |
---|
615 | compressed buffer. |
---|
616 | This function can be used to compress a whole file at once if the |
---|
617 | input file is mmap'ed. |
---|
618 | compress returns Z_OK if success, Z_MEM_ERROR if there was not |
---|
619 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
---|
620 | buffer. |
---|
621 | */ |
---|
622 | |
---|
623 | ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, |
---|
624 | const Bytef *source, uLong sourceLen, |
---|
625 | int level)); |
---|
626 | /* |
---|
627 | Compresses the source buffer into the destination buffer. The level |
---|
628 | parameter has the same meaning as in deflateInit. sourceLen is the byte |
---|
629 | length of the source buffer. Upon entry, destLen is the total size of the |
---|
630 | destination buffer, which must be at least 0.1% larger than sourceLen plus |
---|
631 | 12 bytes. Upon exit, destLen is the actual size of the compressed buffer. |
---|
632 | |
---|
633 | compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
---|
634 | memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
---|
635 | Z_STREAM_ERROR if the level parameter is invalid. |
---|
636 | */ |
---|
637 | |
---|
638 | ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, |
---|
639 | const Bytef *source, uLong sourceLen)); |
---|
640 | /* |
---|
641 | Decompresses the source buffer into the destination buffer. sourceLen is |
---|
642 | the byte length of the source buffer. Upon entry, destLen is the total |
---|
643 | size of the destination buffer, which must be large enough to hold the |
---|
644 | entire uncompressed data. (The size of the uncompressed data must have |
---|
645 | been saved previously by the compressor and transmitted to the decompressor |
---|
646 | by some mechanism outside the scope of this compression library.) |
---|
647 | Upon exit, destLen is the actual size of the compressed buffer. |
---|
648 | This function can be used to decompress a whole file at once if the |
---|
649 | input file is mmap'ed. |
---|
650 | |
---|
651 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
---|
652 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
---|
653 | buffer, or Z_DATA_ERROR if the input data was corrupted. |
---|
654 | */ |
---|
655 | |
---|
656 | |
---|
657 | typedef voidp gzFile; |
---|
658 | |
---|
659 | ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); |
---|
660 | /* |
---|
661 | Opens a gzip (.gz) file for reading or writing. The mode parameter |
---|
662 | is as in fopen ("rb" or "wb") but can also include a compression level |
---|
663 | ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for |
---|
664 | Huffman only compression as in "wb1h". (See the description |
---|
665 | of deflateInit2 for more information about the strategy parameter.) |
---|
666 | |
---|
667 | gzopen can be used to read a file which is not in gzip format; in this |
---|
668 | case gzread will directly read from the file without decompression. |
---|
669 | |
---|
670 | gzopen returns NULL if the file could not be opened or if there was |
---|
671 | insufficient memory to allocate the (de)compression state; errno |
---|
672 | can be checked to distinguish the two cases (if errno is zero, the |
---|
673 | zlib error is Z_MEM_ERROR). */ |
---|
674 | |
---|
675 | ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); |
---|
676 | /* |
---|
677 | gzdopen() associates a gzFile with the file descriptor fd. File |
---|
678 | descriptors are obtained from calls like open, dup, creat, pipe or |
---|
679 | fileno (in the file has been previously opened with fopen). |
---|
680 | The mode parameter is as in gzopen. |
---|
681 | The next call of gzclose on the returned gzFile will also close the |
---|
682 | file descriptor fd, just like fclose(fdopen(fd), mode) closes the file |
---|
683 | descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). |
---|
684 | gzdopen returns NULL if there was insufficient memory to allocate |
---|
685 | the (de)compression state. |
---|
686 | */ |
---|
687 | |
---|
688 | ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); |
---|
689 | /* |
---|
690 | Dynamically update the compression level or strategy. See the description |
---|
691 | of deflateInit2 for the meaning of these parameters. |
---|
692 | gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not |
---|
693 | opened for writing. |
---|
694 | */ |
---|
695 | |
---|
696 | ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); |
---|
697 | /* |
---|
698 | Reads the given number of uncompressed bytes from the compressed file. |
---|
699 | If the input file was not in gzip format, gzread copies the given number |
---|
700 | of bytes into the buffer. |
---|
701 | gzread returns the number of uncompressed bytes actually read (0 for |
---|
702 | end of file, -1 for error). */ |
---|
703 | |
---|
704 | ZEXTERN int ZEXPORT gzwrite OF((gzFile file, |
---|
705 | const voidp buf, unsigned len)); |
---|
706 | /* |
---|
707 | Writes the given number of uncompressed bytes into the compressed file. |
---|
708 | gzwrite returns the number of uncompressed bytes actually written |
---|
709 | (0 in case of error). |
---|
710 | */ |
---|
711 | |
---|
712 | ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); |
---|
713 | /* |
---|
714 | Converts, formats, and writes the args to the compressed file under |
---|
715 | control of the format string, as in fprintf. gzprintf returns the number of |
---|
716 | uncompressed bytes actually written (0 in case of error). |
---|
717 | */ |
---|
718 | |
---|
719 | ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); |
---|
720 | /* |
---|
721 | Writes the given null-terminated string to the compressed file, excluding |
---|
722 | the terminating null character. |
---|
723 | gzputs returns the number of characters written, or -1 in case of error. |
---|
724 | */ |
---|
725 | |
---|
726 | ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); |
---|
727 | /* |
---|
728 | Reads bytes from the compressed file until len-1 characters are read, or |
---|
729 | a newline character is read and transferred to buf, or an end-of-file |
---|
730 | condition is encountered. The string is then terminated with a null |
---|
731 | character. |
---|
732 | gzgets returns buf, or Z_NULL in case of error. |
---|
733 | */ |
---|
734 | |
---|
735 | ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); |
---|
736 | /* |
---|
737 | Writes c, converted to an unsigned char, into the compressed file. |
---|
738 | gzputc returns the value that was written, or -1 in case of error. |
---|
739 | */ |
---|
740 | |
---|
741 | ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); |
---|
742 | /* |
---|
743 | Reads one byte from the compressed file. gzgetc returns this byte |
---|
744 | or -1 in case of end of file or error. |
---|
745 | */ |
---|
746 | |
---|
747 | ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); |
---|
748 | /* |
---|
749 | Flushes all pending output into the compressed file. The parameter |
---|
750 | flush is as in the deflate() function. The return value is the zlib |
---|
751 | error number (see function gzerror below). gzflush returns Z_OK if |
---|
752 | the flush parameter is Z_FINISH and all output could be flushed. |
---|
753 | gzflush should be called only when strictly necessary because it can |
---|
754 | degrade compression. |
---|
755 | */ |
---|
756 | |
---|
757 | ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, |
---|
758 | z_off_t offset, int whence)); |
---|
759 | /* |
---|
760 | Sets the starting position for the next gzread or gzwrite on the |
---|
761 | given compressed file. The offset represents a number of bytes in the |
---|
762 | uncompressed data stream. The whence parameter is defined as in lseek(2); |
---|
763 | the value SEEK_END is not supported. |
---|
764 | If the file is opened for reading, this function is emulated but can be |
---|
765 | extremely slow. If the file is opened for writing, only forward seeks are |
---|
766 | supported; gzseek then compresses a sequence of zeroes up to the new |
---|
767 | starting position. |
---|
768 | |
---|
769 | gzseek returns the resulting offset location as measured in bytes from |
---|
770 | the beginning of the uncompressed stream, or -1 in case of error, in |
---|
771 | particular if the file is opened for writing and the new starting position |
---|
772 | would be before the current position. |
---|
773 | */ |
---|
774 | |
---|
775 | ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); |
---|
776 | /* |
---|
777 | Rewinds the given file. This function is supported only for reading. |
---|
778 | |
---|
779 | gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) |
---|
780 | */ |
---|
781 | |
---|
782 | ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); |
---|
783 | /* |
---|
784 | Returns the starting position for the next gzread or gzwrite on the |
---|
785 | given compressed file. This position represents a number of bytes in the |
---|
786 | uncompressed data stream. |
---|
787 | |
---|
788 | gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) |
---|
789 | */ |
---|
790 | |
---|
791 | ZEXTERN int ZEXPORT gzeof OF((gzFile file)); |
---|
792 | /* |
---|
793 | Returns 1 when EOF has previously been detected reading the given |
---|
794 | input stream, otherwise zero. |
---|
795 | */ |
---|
796 | |
---|
797 | ZEXTERN int ZEXPORT gzclose OF((gzFile file)); |
---|
798 | /* |
---|
799 | Flushes all pending output if necessary, closes the compressed file |
---|
800 | and deallocates all the (de)compression state. The return value is the zlib |
---|
801 | error number (see function gzerror below). |
---|
802 | */ |
---|
803 | |
---|
804 | ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); |
---|
805 | /* |
---|
806 | Returns the error message for the last error which occurred on the |
---|
807 | given compressed file. errnum is set to zlib error number. If an |
---|
808 | error occurred in the file system and not in the compression library, |
---|
809 | errnum is set to Z_ERRNO and the application may consult errno |
---|
810 | to get the exact error code. |
---|
811 | */ |
---|
812 | |
---|
813 | /* checksum functions */ |
---|
814 | |
---|
815 | /* |
---|
816 | These functions are not related to compression but are exported |
---|
817 | anyway because they might be useful in applications using the |
---|
818 | compression library. |
---|
819 | */ |
---|
820 | |
---|
821 | ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); |
---|
822 | |
---|
823 | /* |
---|
824 | Update a running Adler-32 checksum with the bytes buf[0..len-1] and |
---|
825 | return the updated checksum. If buf is NULL, this function returns |
---|
826 | the required initial value for the checksum. |
---|
827 | An Adler-32 checksum is almost as reliable as a CRC32 but can be computed |
---|
828 | much faster. Usage example: |
---|
829 | |
---|
830 | uLong adler = adler32(0L, Z_NULL, 0); |
---|
831 | |
---|
832 | while (read_buffer(buffer, length) != EOF) { |
---|
833 | adler = adler32(adler, buffer, length); |
---|
834 | } |
---|
835 | if (adler != original_adler) error(); |
---|
836 | */ |
---|
837 | |
---|
838 | ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); |
---|
839 | /* |
---|
840 | Update a running crc with the bytes buf[0..len-1] and return the updated |
---|
841 | crc. If buf is NULL, this function returns the required initial value |
---|
842 | for the crc. Pre- and post-conditioning (one's complement) is performed |
---|
843 | within this function so it shouldn't be done by the application. |
---|
844 | Usage example: |
---|
845 | |
---|
846 | uLong crc = crc32(0L, Z_NULL, 0); |
---|
847 | |
---|
848 | while (read_buffer(buffer, length) != EOF) { |
---|
849 | crc = crc32(crc, buffer, length); |
---|
850 | } |
---|
851 | if (crc != original_crc) error(); |
---|
852 | */ |
---|
853 | |
---|
854 | |
---|
855 | /* various hacks, don't look :) */ |
---|
856 | |
---|
857 | /* deflateInit and inflateInit are macros to allow checking the zlib version |
---|
858 | * and the compiler's view of z_stream: |
---|
859 | */ |
---|
860 | ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, |
---|
861 | const char *version, int stream_size)); |
---|
862 | ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, |
---|
863 | const char *version, int stream_size)); |
---|
864 | ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, |
---|
865 | int windowBits, int memLevel, |
---|
866 | int strategy, const char *version, |
---|
867 | int stream_size)); |
---|
868 | ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, |
---|
869 | const char *version, int stream_size)); |
---|
870 | #define deflateInit(strm, level) \ |
---|
871 | deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) |
---|
872 | #define inflateInit(strm) \ |
---|
873 | inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) |
---|
874 | #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ |
---|
875 | deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ |
---|
876 | (strategy), ZLIB_VERSION, sizeof(z_stream)) |
---|
877 | #define inflateInit2(strm, windowBits) \ |
---|
878 | inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) |
---|
879 | |
---|
880 | |
---|
881 | #if !defined(_Z_UTIL_H) && !defined(NO_DUMMY_DECL) |
---|
882 | struct internal_state {int dummy;}; /* hack for buggy compilers */ |
---|
883 | #endif |
---|
884 | |
---|
885 | ZEXTERN const char * ZEXPORT zError OF((int err)); |
---|
886 | ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); |
---|
887 | ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); |
---|
888 | |
---|
889 | #ifdef __cplusplus |
---|
890 | } |
---|
891 | #endif |
---|
892 | |
---|
893 | #endif /* _ZLIB_H */ |
---|