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deps/libgit2/src/util/hash/sha1dc/sha1.c  view on Meta::CPAN

/***
* Copyright 2017 Marc Stevens <marc@marc-stevens.nl>, Dan Shumow (danshu@microsoft.com)
* Distributed under the MIT Software License.
* See accompanying file LICENSE.txt or copy at
* https://opensource.org/licenses/MIT
***/

#ifndef SHA1DC_NO_STANDARD_INCLUDES
#include <string.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h> /* make sure macros like _BIG_ENDIAN visible */
#endif

#ifdef SHA1DC_CUSTOM_INCLUDE_SHA1_C
#include SHA1DC_CUSTOM_INCLUDE_SHA1_C
#endif

#ifndef SHA1DC_INIT_SAFE_HASH_DEFAULT
#define SHA1DC_INIT_SAFE_HASH_DEFAULT 1
#endif

#include "sha1.h"
#include "ubc_check.h"

#if (defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || \
     defined(i386) || defined(__i386) || defined(__i386__) || defined(__i486__)  || \
     defined(__i586__) || defined(__i686__) || defined(_M_IX86) || defined(__X86__) || \
     defined(_X86_) || defined(__THW_INTEL__) || defined(__I86__) || defined(__INTEL__) || \
     defined(__386) || defined(_M_X64) || defined(_M_AMD64))
#define SHA1DC_ON_INTEL_LIKE_PROCESSOR
#endif

/*
   Because Little-Endian architectures are most common,
   we only set SHA1DC_BIGENDIAN if one of these conditions is met.
   Note that all MSFT platforms are little endian,
   so none of these will be defined under the MSC compiler.
   If you are compiling on a big endian platform and your compiler does not define one of these,
   you will have to add whatever macros your tool chain defines to indicate Big-Endianness.
 */

#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__)
/*
 * Should detect Big Endian under GCC since at least 4.6.0 (gcc svn
 * rev #165881). See
 * https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
 *
 * This also works under clang since 3.2, it copied the GCC-ism. See
 * clang.git's 3b198a97d2 ("Preprocessor: add __BYTE_ORDER__
 * predefined macro", 2012-07-27)
 */
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define SHA1DC_BIGENDIAN
#endif

/* Not under GCC-alike */
#elif defined(__BYTE_ORDER) && defined(__BIG_ENDIAN)
/*
 * Should detect Big Endian under glibc.git since 14245eb70e ("entered
 * into RCS", 1992-11-25). Defined in <endian.h> which will have been
 * brought in by standard headers. See glibc.git and
 * https://sourceforge.net/p/predef/wiki/Endianness/
 */
#if __BYTE_ORDER == __BIG_ENDIAN
#define SHA1DC_BIGENDIAN
#endif

/* Not under GCC-alike or glibc */
#elif defined(_BYTE_ORDER) && defined(_BIG_ENDIAN) && defined(_LITTLE_ENDIAN)
/*
 * *BSD and newlib (embedded linux, cygwin, etc).
 * the defined(_BIG_ENDIAN) && defined(_LITTLE_ENDIAN) part prevents
 * this condition from matching with Solaris/sparc.
 * (Solaris defines only one endian macro)
 */
#if _BYTE_ORDER == _BIG_ENDIAN
#define SHA1DC_BIGENDIAN
#endif

/* Not under GCC-alike or glibc or *BSD or newlib */
#elif (defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \
       defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || \
       defined(__sparc))
/*
 * Should define Big Endian for a whitelist of known processors. See
 * https://sourceforge.net/p/predef/wiki/Endianness/ and
 * http://www.oracle.com/technetwork/server-storage/solaris/portingtosolaris-138514.html
 */
#define SHA1DC_BIGENDIAN

/* Not under GCC-alike or glibc or *BSD or newlib or <processor whitelist> */
#elif (defined(_AIX) || defined(__hpux))

/*
 * Defines Big Endian on a whitelist of OSs that are known to be Big
 * Endian-only. See
 * https://public-inbox.org/git/93056823-2740-d072-1ebd-46b440b33d7e@felt.demon.nl/
 */
#define SHA1DC_BIGENDIAN

/* Not under GCC-alike or glibc or *BSD or newlib or <processor whitelist> or <os whitelist> */
#elif defined(SHA1DC_ON_INTEL_LIKE_PROCESSOR)
/*
 * As a last resort before we do anything else we're not 100% sure
 * about below, we blacklist specific processors here. We could add
 * more, see e.g. https://wiki.debian.org/ArchitectureSpecificsMemo