external/public-domain/xz/dist/src/liblzma/api/lzma.h

   1 /**
   2  * \file        api/lzma.h
   3  * \brief       The public API of liblzma data compression library
   4  *
   5  * liblzma is a public domain general-purpose data compression library with
   6  * a zlib-like API. The native file format is .xz, but also the old .lzma
   7  * format and raw (no headers) streams are supported. Multiple compression
   8  * algorithms (filters) are supported. Currently LZMA2 is the primary filter.
   9  *
  10  * liblzma is part of XZ Utils <http://tukaani.org/xz/>. XZ Utils includes
  11  * a gzip-like command line tool named xz and some other tools. XZ Utils
  12  * is developed and maintained by Lasse Collin.
  13  *
  14  * Major parts of liblzma are based on Igor Pavlov's public domain LZMA SDK
  15  * <http://7-zip.org/sdk.html>.
  16  *
  17  * The SHA-256 implementation is based on the public domain code found from
  18  * 7-Zip <http://7-zip.org/>, which has a modified version of the public
  19  * domain SHA-256 code found from Crypto++ <http://www.cryptopp.com/>.
  20  * The SHA-256 code in Crypto++ was written by Kevin Springle and Wei Dai.
  21  */
  22
  23 /*
  24  * Author: Lasse Collin
  25  *
  26  * This file has been put into the public domain.
  27  * You can do whatever you want with this file.
  28  */
  29
  30 #ifndef LZMA_H
  31 #define LZMA_H
  32
  33 /*****************************
  34  * Required standard headers *
  35  *****************************/
  36
  37 /*
  38  * liblzma API headers need some standard types and macros. To allow
  39  * including lzma.h without requiring the application to include other
  40  * headers first, lzma.h includes the required standard headers unless
  41  * they already seem to be included already or if LZMA_MANUAL_HEADERS
  42  * has been defined.
  43  *
  44  * Here's what types and macros are needed and from which headers:
  45  *  - stddef.h: size_t, NULL
  46  *  - stdint.h: uint8_t, uint32_t, uint64_t, UINT32_C(n), uint64_C(n),
  47  *    UINT32_MAX, UINT64_MAX
  48  *
  49  * However, inttypes.h is a little more portable than stdint.h, although
  50  * inttypes.h declares some unneeded things compared to plain stdint.h.
  51  *
  52  * The hacks below aren't perfect, specifically they assume that inttypes.h
  53  * exists and that it typedefs at least uint8_t, uint32_t, and uint64_t,
  54  * and that, in case of incomplete inttypes.h, unsigned int is 32-bit.
  55  * If the application already takes care of setting up all the types and
  56  * macros properly (for example by using gnulib's stdint.h or inttypes.h),
  57  * we try to detect that the macros are already defined and don't include
  58  * inttypes.h here again. However, you may define LZMA_MANUAL_HEADERS to
  59  * force this file to never include any system headers.
  60  *
  61  * Some could argue that liblzma API should provide all the required types,
  62  * for example lzma_uint64, LZMA_UINT64_C(n), and LZMA_UINT64_MAX. This was
  63  * seen as an unnecessary mess, since most systems already provide all the
  64  * necessary types and macros in the standard headers.
  65  *
  66  * Note that liblzma API still has lzma_bool, because using stdbool.h would
  67  * break C89 and C++ programs on many systems. sizeof(bool) in C99 isn't
  68  * necessarily the same as sizeof(bool) in C++.
  69  */
  70
  71 #ifndef LZMA_MANUAL_HEADERS
  72         /*
  73          * I suppose this works portably also in C++. Note that in C++,
  74          * we need to get size_t into the global namespace.
  75          */
  76 #       include <stddef.h>
  77
  78         /*
  79          * Skip inttypes.h if we already have all the required macros. If we
  80          * have the macros, we assume that we have the matching typedefs too.
  81          */
  82 #       if !defined(UINT32_C) || !defined(UINT64_C) \
  83                         || !defined(UINT32_MAX) || !defined(UINT64_MAX)
  84                 /*
  85                  * MSVC has no C99 support, and thus it cannot be used to
  86                  * compile liblzma. The liblzma API has to still be usable
  87                  * from MSVC, so we need to define the required standard
  88                  * integer types here.
  89                  */
  90 #               if defined(_WIN32) && defined(_MSC_VER)
  91                         typedef unsigned __int8 uint8_t;
  92                         typedef unsigned __int32 uint32_t;
  93                         typedef unsigned __int64 uint64_t;
  94 #               else
  95                         /* Use the standard inttypes.h. */
  96 #                       ifdef __cplusplus
  97                                 /*
  98                                  * C99 sections 7.18.2 and 7.18.4 specify
  99                                  * that C++ implementations define the limit
 100                                  * and constant macros only if specifically
 101                                  * requested. Note that if you want the
 102                                  * format macros (PRIu64 etc.) too, you need
 103                                  * to define __STDC_FORMAT_MACROS before
 104                                  * including lzma.h, since re-including
 105                                  * inttypes.h with __STDC_FORMAT_MACROS
 106                                  * defined doesn't necessarily work.
 107                                  */
 108 #                               ifndef __STDC_LIMIT_MACROS
 109 #                                       define __STDC_LIMIT_MACROS 1
 110 #                               endif
 111 #                               ifndef __STDC_CONSTANT_MACROS
 112 #                                       define __STDC_CONSTANT_MACROS 1
 113 #                               endif
 114 #                       endif
 115
 116 #                       include <inttypes.h>
 117 #               endif
 118
 119                 /*
 120                  * Some old systems have only the typedefs in inttypes.h, and
 121                  * lack all the macros. For those systems, we need a few more
 122                  * hacks. We assume that unsigned int is 32-bit and unsigned
 123                  * long is either 32-bit or 64-bit. If these hacks aren't
 124                  * enough, the application has to setup the types manually
 125                  * before including lzma.h.
 126                  */
 127 #               ifndef UINT32_C
 128 #                       if defined(_WIN32) && defined(_MSC_VER)
 129 #                               define UINT32_C(n) n ## UI32
 130 #                       else
 131 #                               define UINT32_C(n) n ## U
 132 #                       endif
 133 #               endif
 134
 135 #               ifndef UINT64_C
 136 #                       if defined(_WIN32) && defined(_MSC_VER)
 137 #                               define UINT64_C(n) n ## UI64
 138 #                       else
 139                                 /* Get ULONG_MAX. */
 140 #                               include <limits.h>
 141 #                               if ULONG_MAX == 4294967295UL
 142 #                                       define UINT64_C(n) n ## ULL
 143 #                               else
 144 #                                       define UINT64_C(n) n ## UL
 145 #                               endif
 146 #                       endif
 147 #               endif
 148
 149 #               ifndef UINT32_MAX
 150 #                       define UINT32_MAX (UINT32_C(4294967295))
 151 #               endif
 152
 153 #               ifndef UINT64_MAX
 154 #                       define UINT64_MAX (UINT64_C(18446744073709551615))
 155 #               endif
 156 #       endif
 157 #endif /* ifdef LZMA_MANUAL_HEADERS */
 158
 159
 160 /******************
 161  * LZMA_API macro *
 162  ******************/
 163
 164 /*
 165  * Some systems require that the functions and function pointers are
 166  * declared specially in the headers. LZMA_API_IMPORT is for importing
 167  * symbols and LZMA_API_CALL is to specify the calling convention.
 168  *
 169  * By default it is assumed that the application will link dynamically
 170  * against liblzma. #define LZMA_API_STATIC in your application if you
 171  * want to link against static liblzma. If you don't care about portability
 172  * to operating systems like Windows, or at least don't care about linking
 173  * against static liblzma on them, don't worry about LZMA_API_STATIC. That
 174  * is, most developers will never need to use LZMA_API_STATIC.
 175  *
 176  * The GCC variants are a special case on Windows (Cygwin and MinGW).
 177  * We rely on GCC doing the right thing with its auto-import feature,
 178  * and thus don't use __declspec(dllimport). This way developers don't
 179  * need to worry about LZMA_API_STATIC. Also the calling convention is
 180  * omitted on Cygwin but not on MinGW.
 181  */
 182 #ifndef LZMA_API_IMPORT
 183 #       if !defined(LZMA_API_STATIC) && defined(_WIN32) && !defined(__GNUC__)
 184 #               define LZMA_API_IMPORT __declspec(dllimport)
 185 #       else
 186 #               define LZMA_API_IMPORT
 187 #       endif
 188 #endif
 189
 190 #ifndef LZMA_API_CALL
 191 #       if defined(_WIN32) && !defined(__CYGWIN__)
 192 #               define LZMA_API_CALL __cdecl
 193 #       else
 194 #               define LZMA_API_CALL
 195 #       endif
 196 #endif
 197
 198 #ifndef LZMA_API
 199 #       define LZMA_API(type) LZMA_API_IMPORT type LZMA_API_CALL
 200 #endif
 201
 202
 203 /***********
 204  * nothrow *
 205  ***********/
 206
 207 /*
 208  * None of the functions in liblzma may throw an exception. Even
 209  * the functions that use callback functions won't throw exceptions,
 210  * because liblzma would break if a callback function threw an exception.
 211  */
 212 #ifndef lzma_nothrow
 213 #       if defined(__cplusplus)
 214 #               define lzma_nothrow throw()
 215 #       elif __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
 216 #               define lzma_nothrow __attribute__((__nothrow__))
 217 #       else
 218 #               define lzma_nothrow
 219 #       endif
 220 #endif
 221
 222
 223 /********************
 224  * GNU C extensions *
 225  ********************/
 226
 227 /*
 228  * GNU C extensions are used conditionally in the public API. It doesn't
 229  * break anything if these are sometimes enabled and sometimes not, only
 230  * affects warnings and optimizations.
 231  */
 232 #if __GNUC__ >= 3
 233 #       ifndef lzma_attribute
 234 #               define lzma_attribute(attr) __attribute__(attr)
 235 #       endif
 236
 237         /* warn_unused_result was added in GCC 3.4. */
 238 #       ifndef lzma_attr_warn_unused_result
 239 #               if __GNUC__ == 3 && __GNUC_MINOR__ < 4
 240 #                       define lzma_attr_warn_unused_result
 241 #               endif
 242 #       endif
 243
 244 #else
 245 #       ifndef lzma_attribute
 246 #               define lzma_attribute(attr)
 247 #       endif
 248 #endif
 249
 250
 251 #ifndef lzma_attr_pure
 252 #       define lzma_attr_pure lzma_attribute((__pure__))
 253 #endif
 254
 255 #ifndef lzma_attr_const
 256 #       define lzma_attr_const lzma_attribute((__const__))
 257 #endif
 258
 259 #ifndef lzma_attr_warn_unused_result
 260 #       define lzma_attr_warn_unused_result \
 261                 lzma_attribute((__warn_unused_result__))
 262 #endif
 263
 264
 265 /**************
 266  * Subheaders *
 267  **************/
 268
 269 #ifdef __cplusplus
 270 extern "C" {
 271 #endif
 272
 273 /*
 274  * Subheaders check that this is defined. It is to prevent including
 275  * them directly from applications.
 276  */
 277 #define LZMA_H_INTERNAL 1
 278
 279 /* Basic features */
 280 #include "lzma/version.h"
 281 #include "lzma/base.h"
 282 #include "lzma/vli.h"
 283 #include "lzma/check.h"
 284
 285 /* Filters */
 286 #include "lzma/filter.h"
 287 #include "lzma/bcj.h"
 288 #include "lzma/delta.h"
 289 #include "lzma/lzma12.h"
 290
 291 /* Container formats */
 292 #include "lzma/container.h"
 293
 294 /* Advanced features */
 295 #include "lzma/stream_flags.h"
 296 #include "lzma/block.h"
 297 #include "lzma/index.h"
 298 #include "lzma/index_hash.h"
 299
 300 /* Hardware information */
 301 #include "lzma/hardware.h"
 302
 303 /*
 304  * All subheaders included. Undefine LZMA_H_INTERNAL to prevent applications
 305  * re-including the subheaders.
 306  */
 307 #undef LZMA_H_INTERNAL
 308
 309 #ifdef __cplusplus
 310 }
 311 #endif
 312
 313 #endif /* ifndef LZMA_H */