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lzma.h
/** * \file api/lzma.h * \brief The public API of liblzma data compression library * * liblzma is a public domain general-purpose data compression library with * a zlib-like API. The native file format is .xz, but also the old .lzma * format and raw (no headers) streams are supported. Multiple compression * algorithms (filters) are supported. Currently LZMA2 is the primary filter. * * liblzma is part of XZ Utils <http://tukaani.org/xz/>. XZ Utils includes * a gzip-like command line tool named xz and some other tools. XZ Utils * is developed and maintained by Lasse Collin. * * Major parts of liblzma are based on Igor Pavlov's public domain LZMA SDK * <http://7-zip.org/sdk.html>. * * The SHA-256 implementation is based on the public domain code found from * 7-Zip <http://7-zip.org/>, which has a modified version of the public * domain SHA-256 code found from Crypto++ <http://www.cryptopp.com/>. * The SHA-256 code in Crypto++ was written by Kevin Springle and Wei Dai. */ /* * Author: Lasse Collin * * This file has been put into the public domain. * You can do whatever you want with this file. */ #ifndef LZMA_H #define LZMA_H /***************************** * Required standard headers * *****************************/ /* * liblzma API headers need some standard types and macros. To allow * including lzma.h without requiring the application to include other * headers first, lzma.h includes the required standard headers unless * they already seem to be included already or if LZMA_MANUAL_HEADERS * has been defined. * * Here's what types and macros are needed and from which headers: * - stddef.h: size_t, NULL * - stdint.h: uint8_t, uint32_t, uint64_t, UINT32_C(n), uint64_C(n), * UINT32_MAX, UINT64_MAX * * However, inttypes.h is a little more portable than stdint.h, although * inttypes.h declares some unneeded things compared to plain stdint.h. * * The hacks below aren't perfect, specifically they assume that inttypes.h * exists and that it typedefs at least uint8_t, uint32_t, and uint64_t, * and that, in case of incomplete inttypes.h, unsigned int is 32-bit. * If the application already takes care of setting up all the types and * macros properly (for example by using gnulib's stdint.h or inttypes.h), * we try to detect that the macros are already defined and don't include * inttypes.h here again. However, you may define LZMA_MANUAL_HEADERS to * force this file to never include any system headers. * * Some could argue that liblzma API should provide all the required types, * for example lzma_uint64, LZMA_UINT64_C(n), and LZMA_UINT64_MAX. This was * seen as an unnecessary mess, since most systems already provide all the * necessary types and macros in the standard headers. * * Note that liblzma API still has lzma_bool, because using stdbool.h would * break C89 and C++ programs on many systems. sizeof(bool) in C99 isn't * necessarily the same as sizeof(bool) in C++. */ #ifndef LZMA_MANUAL_HEADERS /* * I suppose this works portably also in C++. Note that in C++, * we need to get size_t into the global namespace. */ # include <stddef.h> /* * Skip inttypes.h if we already have all the required macros. If we * have the macros, we assume that we have the matching typedefs too. */ # if !defined(UINT32_C) || !defined(UINT64_C) \ || !defined(UINT32_MAX) || !defined(UINT64_MAX) /* * MSVC versions older than 2013 have no C99 support, and * thus they cannot be used to compile liblzma. Using an * existing liblzma.dll with old MSVC can work though(*), * but we need to define the required standard integer * types here in a MSVC-specific way. * * (*) If you do this, the existing liblzma.dll probably uses * a different runtime library than your MSVC-built * application. Mixing runtimes is generally bad, but * in this case it should work as long as you avoid * the few rarely-needed liblzma functions that allocate * memory and expect the caller to free it using free(). */ # if defined(_WIN32) && defined(_MSC_VER) && _MSC_VER < 1800 typedef unsigned __int8 uint8_t; typedef unsigned __int32 uint32_t; typedef unsigned __int64 uint64_t; # else /* Use the standard inttypes.h. */ # ifdef __cplusplus /* * C99 sections 7.18.2 and 7.18.4 specify * that C++ implementations define the limit * and constant macros only if specifically * requested. Note that if you want the * format macros (PRIu64 etc.) too, you need * to define __STDC_FORMAT_MACROS before * including lzma.h, since re-including * inttypes.h with __STDC_FORMAT_MACROS * defined doesn't necessarily work. */ # ifndef __STDC_LIMIT_MACROS # define __STDC_LIMIT_MACROS 1 # endif # ifndef __STDC_CONSTANT_MACROS # define __STDC_CONSTANT_MACROS 1 # endif # endif # include <inttypes.h> # endif /* * Some old systems have only the typedefs in inttypes.h, and * lack all the macros. For those systems, we need a few more * hacks. We assume that unsigned int is 32-bit and unsigned * long is either 32-bit or 64-bit. If these hacks aren't * enough, the application has to setup the types manually * before including lzma.h. */ # ifndef UINT32_C # if defined(_WIN32) && defined(_MSC_VER) # define UINT32_C(n) n ## UI32 # else # define UINT32_C(n) n ## U # endif # endif # ifndef UINT64_C # if defined(_WIN32) && defined(_MSC_VER) # define UINT64_C(n) n ## UI64 # else /* Get ULONG_MAX. */ # include <limits.h> # if ULONG_MAX == 4294967295UL # define UINT64_C(n) n ## ULL # else # define UINT64_C(n) n ## UL # endif # endif # endif # ifndef UINT32_MAX # define UINT32_MAX (UINT32_C(4294967295)) # endif # ifndef UINT64_MAX # define UINT64_MAX (UINT64_C(18446744073709551615)) # endif # endif #endif /* ifdef LZMA_MANUAL_HEADERS */ /****************** * LZMA_API macro * ******************/ /* * Some systems require that the functions and function pointers are * declared specially in the headers. LZMA_API_IMPORT is for importing * symbols and LZMA_API_CALL is to specify the calling convention. * * By default it is assumed that the application will link dynamically * against liblzma. #define LZMA_API_STATIC in your application if you * want to link against static liblzma. If you don't care about portability * to operating systems like Windows, or at least don't care about linking * against static liblzma on them, don't worry about LZMA_API_STATIC. That * is, most developers will never need to use LZMA_API_STATIC. * * The GCC variants are a special case on Windows (Cygwin and MinGW). * We rely on GCC doing the right thing with its auto-import feature, * and thus don't use __declspec(dllimport). This way developers don't * need to worry about LZMA_API_STATIC. Also the calling convention is * omitted on Cygwin but not on MinGW. */ #ifndef LZMA_API_IMPORT # if !defined(LZMA_API_STATIC) && defined(_WIN32) && !defined(__GNUC__) # define LZMA_API_IMPORT __declspec(dllimport) # else # define LZMA_API_IMPORT # endif #endif #ifndef LZMA_API_CALL # if defined(_WIN32) && !defined(__CYGWIN__) # define LZMA_API_CALL __cdecl # else # define LZMA_API_CALL # endif #endif #ifndef LZMA_API # define LZMA_API(type) LZMA_API_IMPORT type LZMA_API_CALL #endif /*********** * nothrow * ***********/ /* * None of the functions in liblzma may throw an exception. Even * the functions that use callback functions won't throw exceptions, * because liblzma would break if a callback function threw an exception. */ #ifndef lzma_nothrow # if defined(__cplusplus) # if __cplusplus >= 201103L || (defined(_MSVC_LANG) \ && _MSVC_LANG >= 201103L) # define lzma_nothrow noexcept # else # define lzma_nothrow throw() # endif # elif defined(__GNUC__) && (__GNUC__ > 3 \ || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) # define lzma_nothrow __attribute__((__nothrow__)) # else # define lzma_nothrow # endif #endif /******************** * GNU C extensions * ********************/ /* * GNU C extensions are used conditionally in the public API. It doesn't * break anything if these are sometimes enabled and sometimes not, only * affects warnings and optimizations. */ #if defined(__GNUC__) && __GNUC__ >= 3 # ifndef lzma_attribute # define lzma_attribute(attr) __attribute__(attr) # endif /* warn_unused_result was added in GCC 3.4. */ # ifndef lzma_attr_warn_unused_result # if __GNUC__ == 3 && __GNUC_MINOR__ < 4 # define lzma_attr_warn_unused_result # endif # endif #else # ifndef lzma_attribute # define lzma_attribute(attr) # endif #endif #ifndef lzma_attr_pure # define lzma_attr_pure lzma_attribute((__pure__)) #endif #ifndef lzma_attr_const # define lzma_attr_const lzma_attribute((__const__)) #endif #ifndef lzma_attr_warn_unused_result # define lzma_attr_warn_unused_result \ lzma_attribute((__warn_unused_result__)) #endif /************** * Subheaders * **************/ #ifdef __cplusplus extern "C" { #endif /* * Subheaders check that this is defined. It is to prevent including * them directly from applications. */ #define LZMA_H_INTERNAL 1 /* Basic features */ #include "lzma/version.h" #include "lzma/base.h" #include "lzma/vli.h" #include "lzma/check.h" /* Filters */ #include "lzma/filter.h" #include "lzma/bcj.h" #include "lzma/delta.h" #include "lzma/lzma12.h" /* Container formats */ #include "lzma/container.h" /* Advanced features */ #include "lzma/stream_flags.h" #include "lzma/block.h" #include "lzma/index.h" #include "lzma/index_hash.h" /* Hardware information */ #include "lzma/hardware.h" /* * All subheaders included. Undefine LZMA_H_INTERNAL to prevent applications * re-including the subheaders. */ #undef LZMA_H_INTERNAL #ifdef __cplusplus } #endif #endif /* ifndef LZMA_H */
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