1 /* SPDX-License-Identifier: 0BSD */ 2 3 /** 4 * \file api/lzma.h 5 * \brief The public API of liblzma data compression library 6 * \mainpage 7 * 8 * liblzma is a general-purpose data compression library with a zlib-like API. 9 * The native file format is .xz, but also the old .lzma format and raw (no 10 * headers) streams are supported. Multiple compression algorithms (filters) 11 * are supported. Currently LZMA2 is the primary filter. 12 * 13 * liblzma is part of XZ Utils <https://xz.tukaani.org/xz-utils/>. XZ Utils 14 * includes a gzip-like command line tool named xz and some other tools. 15 * XZ Utils is developed and maintained by Lasse Collin and Jia Tan. 16 * 17 * Major parts of liblzma are based on code written by Igor Pavlov, 18 * specifically the LZMA SDK <https://7-zip.org/sdk.html>. 19 * 20 * The SHA-256 implementation in liblzma is based on code written by 21 * Wei Dai in Crypto++ Library <https://www.cryptopp.com/>. 22 * 23 * liblzma is distributed under the BSD Zero Clause License (0BSD). 24 */ 25 26 /* 27 * Author: Lasse Collin 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 versions older than 2013 have no C99 support, and 86 * thus they cannot be used to compile liblzma. Using an 87 * existing liblzma.dll with old MSVC can work though(*), 88 * but we need to define the required standard integer 89 * types here in a MSVC-specific way. 90 * 91 * (*) If you do this, the existing liblzma.dll probably uses 92 * a different runtime library than your MSVC-built 93 * application. Mixing runtimes is generally bad, but 94 * in this case it should work as long as you avoid 95 * the few rarely-needed liblzma functions that allocate 96 * memory and expect the caller to free it using free(). 97 */ 98 # if defined(_WIN32) && defined(_MSC_VER) && _MSC_VER < 1800 99 typedef unsigned __int8 uint8_t; 100 typedef unsigned __int32 uint32_t; 101 typedef unsigned __int64 uint64_t; 102 # else 103 /* Use the standard inttypes.h. */ 104 # ifdef __cplusplus 105 /* 106 * C99 sections 7.18.2 and 7.18.4 specify 107 * that C++ implementations define the limit 108 * and constant macros only if specifically 109 * requested. Note that if you want the 110 * format macros (PRIu64 etc.) too, you need 111 * to define __STDC_FORMAT_MACROS before 112 * including lzma.h, since re-including 113 * inttypes.h with __STDC_FORMAT_MACROS 114 * defined doesn't necessarily work. 115 */ 116 # ifndef __STDC_LIMIT_MACROS 117 # define __STDC_LIMIT_MACROS 1 118 # endif 119 # ifndef __STDC_CONSTANT_MACROS 120 # define __STDC_CONSTANT_MACROS 1 121 # endif 122 # endif 123 124 # include <inttypes.h> 125 # endif 126 127 /* 128 * Some old systems have only the typedefs in inttypes.h, and 129 * lack all the macros. For those systems, we need a few more 130 * hacks. We assume that unsigned int is 32-bit and unsigned 131 * long is either 32-bit or 64-bit. If these hacks aren't 132 * enough, the application has to setup the types manually 133 * before including lzma.h. 134 */ 135 # ifndef UINT32_C 136 # if defined(_WIN32) && defined(_MSC_VER) 137 # define UINT32_C(n) n ## UI32 138 # else 139 # define UINT32_C(n) n ## U 140 # endif 141 # endif 142 143 # ifndef UINT64_C 144 # if defined(_WIN32) && defined(_MSC_VER) 145 # define UINT64_C(n) n ## UI64 146 # else 147 /* Get ULONG_MAX. */ 148 # include <limits.h> 149 # if ULONG_MAX == 4294967295UL 150 # define UINT64_C(n) n ## ULL 151 # else 152 # define UINT64_C(n) n ## UL 153 # endif 154 # endif 155 # endif 156 157 # ifndef UINT32_MAX 158 # define UINT32_MAX (UINT32_C(4294967295)) 159 # endif 160 161 # ifndef UINT64_MAX 162 # define UINT64_MAX (UINT64_C(18446744073709551615)) 163 # endif 164 # endif 165 #endif /* ifdef LZMA_MANUAL_HEADERS */ 166 167 168 /****************** 169 * LZMA_API macro * 170 ******************/ 171 172 /* 173 * Some systems require that the functions and function pointers are 174 * declared specially in the headers. LZMA_API_IMPORT is for importing 175 * symbols and LZMA_API_CALL is to specify the calling convention. 176 * 177 * By default it is assumed that the application will link dynamically 178 * against liblzma. #define LZMA_API_STATIC in your application if you 179 * want to link against static liblzma. If you don't care about portability 180 * to operating systems like Windows, or at least don't care about linking 181 * against static liblzma on them, don't worry about LZMA_API_STATIC. That 182 * is, most developers will never need to use LZMA_API_STATIC. 183 * 184 * The GCC variants are a special case on Windows (Cygwin and MinGW-w64). 185 * We rely on GCC doing the right thing with its auto-import feature, 186 * and thus don't use __declspec(dllimport). This way developers don't 187 * need to worry about LZMA_API_STATIC. Also the calling convention is 188 * omitted on Cygwin but not on MinGW-w64. 189 */ 190 #ifndef LZMA_API_IMPORT 191 # if !defined(LZMA_API_STATIC) && defined(_WIN32) && !defined(__GNUC__) 192 # define LZMA_API_IMPORT __declspec(dllimport) 193 # else 194 # define LZMA_API_IMPORT 195 # endif 196 #endif 197 198 #ifndef LZMA_API_CALL 199 # if defined(_WIN32) && !defined(__CYGWIN__) 200 # define LZMA_API_CALL __cdecl 201 # else 202 # define LZMA_API_CALL 203 # endif 204 #endif 205 206 #ifndef LZMA_API 207 # define LZMA_API(type) LZMA_API_IMPORT type LZMA_API_CALL 208 #endif 209 210 211 /*********** 212 * nothrow * 213 ***********/ 214 215 /* 216 * None of the functions in liblzma may throw an exception. Even 217 * the functions that use callback functions won't throw exceptions, 218 * because liblzma would break if a callback function threw an exception. 219 */ 220 #ifndef lzma_nothrow 221 # if defined(__cplusplus) 222 # if __cplusplus >= 201103L || (defined(_MSVC_LANG) \ 223 && _MSVC_LANG >= 201103L) 224 # define lzma_nothrow noexcept 225 # else 226 # define lzma_nothrow throw() 227 # endif 228 # elif defined(__GNUC__) && (__GNUC__ > 3 \ 229 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) 230 # define lzma_nothrow __attribute__((__nothrow__)) 231 # else 232 # define lzma_nothrow 233 # endif 234 #endif 235 236 237 /******************** 238 * GNU C extensions * 239 ********************/ 240 241 /* 242 * GNU C extensions are used conditionally in the public API. It doesn't 243 * break anything if these are sometimes enabled and sometimes not, only 244 * affects warnings and optimizations. 245 */ 246 #if defined(__GNUC__) && __GNUC__ >= 3 247 # ifndef lzma_attribute 248 # define lzma_attribute(attr) __attribute__(attr) 249 # endif 250 251 /* warn_unused_result was added in GCC 3.4. */ 252 # ifndef lzma_attr_warn_unused_result 253 # if __GNUC__ == 3 && __GNUC_MINOR__ < 4 254 # define lzma_attr_warn_unused_result 255 # endif 256 # endif 257 258 #else 259 # ifndef lzma_attribute 260 # define lzma_attribute(attr) 261 # endif 262 #endif 263 264 265 #ifndef lzma_attr_pure 266 # define lzma_attr_pure lzma_attribute((__pure__)) 267 #endif 268 269 #ifndef lzma_attr_const 270 # define lzma_attr_const lzma_attribute((__const__)) 271 #endif 272 273 #ifndef lzma_attr_warn_unused_result 274 # define lzma_attr_warn_unused_result \ 275 lzma_attribute((__warn_unused_result__)) 276 #endif 277 278 279 /************** 280 * Subheaders * 281 **************/ 282 283 #ifdef __cplusplus 284 extern "C" { 285 #endif 286 287 /* 288 * Subheaders check that this is defined. It is to prevent including 289 * them directly from applications. 290 */ 291 #define LZMA_H_INTERNAL 1 292 293 /* Basic features */ 294 #include "lzma/version.h" 295 #include "lzma/base.h" 296 #include "lzma/vli.h" 297 #include "lzma/check.h" 298 299 /* Filters */ 300 #include "lzma/filter.h" 301 #include "lzma/bcj.h" 302 #include "lzma/delta.h" 303 #include "lzma/lzma12.h" 304 305 /* Container formats */ 306 #include "lzma/container.h" 307 308 /* Advanced features */ 309 #include "lzma/stream_flags.h" 310 #include "lzma/block.h" 311 #include "lzma/index.h" 312 #include "lzma/index_hash.h" 313 314 /* Hardware information */ 315 #include "lzma/hardware.h" 316 317 /* 318 * All subheaders included. Undefine LZMA_H_INTERNAL to prevent applications 319 * re-including the subheaders. 320 */ 321 #undef LZMA_H_INTERNAL 322 323 #ifdef __cplusplus 324 } 325 #endif 326 327 #endif /* ifndef LZMA_H */ 328