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Diffstat (limited to 'vendor/github.com/DataDog/zstd/mem.h')
| -rw-r--r-- | vendor/github.com/DataDog/zstd/mem.h | 380 |
1 files changed, 0 insertions, 380 deletions
diff --git a/vendor/github.com/DataDog/zstd/mem.h b/vendor/github.com/DataDog/zstd/mem.h deleted file mode 100644 index 5da248756..000000000 --- a/vendor/github.com/DataDog/zstd/mem.h +++ /dev/null @@ -1,380 +0,0 @@ -/* - * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. - * All rights reserved. - * - * This source code is licensed under both the BSD-style license (found in the - * LICENSE file in the root directory of this source tree) and the GPLv2 (found - * in the COPYING file in the root directory of this source tree). - * You may select, at your option, one of the above-listed licenses. - */ - -#ifndef MEM_H_MODULE -#define MEM_H_MODULE - -#if defined (__cplusplus) -extern "C" { -#endif - -/*-**************************************** -* Dependencies -******************************************/ -#include <stddef.h> /* size_t, ptrdiff_t */ -#include <string.h> /* memcpy */ - - -/*-**************************************** -* Compiler specifics -******************************************/ -#if defined(_MSC_VER) /* Visual Studio */ -# include <stdlib.h> /* _byteswap_ulong */ -# include <intrin.h> /* _byteswap_* */ -#endif -#if defined(__GNUC__) -# define MEM_STATIC static __inline __attribute__((unused)) -#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) -# define MEM_STATIC static inline -#elif defined(_MSC_VER) -# define MEM_STATIC static __inline -#else -# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ -#endif - -#ifndef __has_builtin -# define __has_builtin(x) 0 /* compat. with non-clang compilers */ -#endif - -/* code only tested on 32 and 64 bits systems */ -#define MEM_STATIC_ASSERT(c) { enum { MEM_static_assert = 1/(int)(!!(c)) }; } -MEM_STATIC void MEM_check(void) { MEM_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); } - - -/*-************************************************************** -* Basic Types -*****************************************************************/ -#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) ) -# include <stdint.h> - typedef uint8_t BYTE; - typedef uint16_t U16; - typedef int16_t S16; - typedef uint32_t U32; - typedef int32_t S32; - typedef uint64_t U64; - typedef int64_t S64; -#else -# include <limits.h> -#if CHAR_BIT != 8 -# error "this implementation requires char to be exactly 8-bit type" -#endif - typedef unsigned char BYTE; -#if USHRT_MAX != 65535 -# error "this implementation requires short to be exactly 16-bit type" -#endif - typedef unsigned short U16; - typedef signed short S16; -#if UINT_MAX != 4294967295 -# error "this implementation requires int to be exactly 32-bit type" -#endif - typedef unsigned int U32; - typedef signed int S32; -/* note : there are no limits defined for long long type in C90. - * limits exist in C99, however, in such case, <stdint.h> is preferred */ - typedef unsigned long long U64; - typedef signed long long S64; -#endif - - -/*-************************************************************** -* Memory I/O -*****************************************************************/ -/* MEM_FORCE_MEMORY_ACCESS : - * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. - * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. - * The below switch allow to select different access method for improved performance. - * Method 0 (default) : use `memcpy()`. Safe and portable. - * Method 1 : `__packed` statement. It depends on compiler extension (i.e., not portable). - * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. - * Method 2 : direct access. This method is portable but violate C standard. - * It can generate buggy code on targets depending on alignment. - * In some circumstances, it's the only known way to get the most performance (i.e. GCC + ARMv6) - * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. - * Prefer these methods in priority order (0 > 1 > 2) - */ -#ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ -# if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) ) -# define MEM_FORCE_MEMORY_ACCESS 2 -# elif defined(__INTEL_COMPILER) || defined(__GNUC__) -# define MEM_FORCE_MEMORY_ACCESS 1 -# endif -#endif - -MEM_STATIC unsigned MEM_32bits(void) { return sizeof(size_t)==4; } -MEM_STATIC unsigned MEM_64bits(void) { return sizeof(size_t)==8; } - -MEM_STATIC unsigned MEM_isLittleEndian(void) -{ - const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ - return one.c[0]; -} - -#if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2) - -/* violates C standard, by lying on structure alignment. -Only use if no other choice to achieve best performance on target platform */ -MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; } -MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; } -MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; } -MEM_STATIC size_t MEM_readST(const void* memPtr) { return *(const size_t*) memPtr; } - -MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } -MEM_STATIC void MEM_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } -MEM_STATIC void MEM_write64(void* memPtr, U64 value) { *(U64*)memPtr = value; } - -#elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1) - -/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ -/* currently only defined for gcc and icc */ -#if defined(_MSC_VER) || (defined(__INTEL_COMPILER) && defined(WIN32)) - __pragma( pack(push, 1) ) - typedef struct { U16 v; } unalign16; - typedef struct { U32 v; } unalign32; - typedef struct { U64 v; } unalign64; - typedef struct { size_t v; } unalignArch; - __pragma( pack(pop) ) -#else - typedef struct { U16 v; } __attribute__((packed)) unalign16; - typedef struct { U32 v; } __attribute__((packed)) unalign32; - typedef struct { U64 v; } __attribute__((packed)) unalign64; - typedef struct { size_t v; } __attribute__((packed)) unalignArch; -#endif - -MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign16*)ptr)->v; } -MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign32*)ptr)->v; } -MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign64*)ptr)->v; } -MEM_STATIC size_t MEM_readST(const void* ptr) { return ((const unalignArch*)ptr)->v; } - -MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign16*)memPtr)->v = value; } -MEM_STATIC void MEM_write32(void* memPtr, U32 value) { ((unalign32*)memPtr)->v = value; } -MEM_STATIC void MEM_write64(void* memPtr, U64 value) { ((unalign64*)memPtr)->v = value; } - -#else - -/* default method, safe and standard. - can sometimes prove slower */ - -MEM_STATIC U16 MEM_read16(const void* memPtr) -{ - U16 val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC U32 MEM_read32(const void* memPtr) -{ - U32 val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC U64 MEM_read64(const void* memPtr) -{ - U64 val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC size_t MEM_readST(const void* memPtr) -{ - size_t val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC void MEM_write16(void* memPtr, U16 value) -{ - memcpy(memPtr, &value, sizeof(value)); -} - -MEM_STATIC void MEM_write32(void* memPtr, U32 value) -{ - memcpy(memPtr, &value, sizeof(value)); -} - -MEM_STATIC void MEM_write64(void* memPtr, U64 value) -{ - memcpy(memPtr, &value, sizeof(value)); -} - -#endif /* MEM_FORCE_MEMORY_ACCESS */ - -MEM_STATIC U32 MEM_swap32(U32 in) -{ -#if defined(_MSC_VER) /* Visual Studio */ - return _byteswap_ulong(in); -#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \ - || (defined(__clang__) && __has_builtin(__builtin_bswap32)) - return __builtin_bswap32(in); -#else - return ((in << 24) & 0xff000000 ) | - ((in << 8) & 0x00ff0000 ) | - ((in >> 8) & 0x0000ff00 ) | - ((in >> 24) & 0x000000ff ); -#endif -} - -MEM_STATIC U64 MEM_swap64(U64 in) -{ -#if defined(_MSC_VER) /* Visual Studio */ - return _byteswap_uint64(in); -#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \ - || (defined(__clang__) && __has_builtin(__builtin_bswap64)) - return __builtin_bswap64(in); -#else - return ((in << 56) & 0xff00000000000000ULL) | - ((in << 40) & 0x00ff000000000000ULL) | - ((in << 24) & 0x0000ff0000000000ULL) | - ((in << 8) & 0x000000ff00000000ULL) | - ((in >> 8) & 0x00000000ff000000ULL) | - ((in >> 24) & 0x0000000000ff0000ULL) | - ((in >> 40) & 0x000000000000ff00ULL) | - ((in >> 56) & 0x00000000000000ffULL); -#endif -} - -MEM_STATIC size_t MEM_swapST(size_t in) -{ - if (MEM_32bits()) - return (size_t)MEM_swap32((U32)in); - else - return (size_t)MEM_swap64((U64)in); -} - -/*=== Little endian r/w ===*/ - -MEM_STATIC U16 MEM_readLE16(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_read16(memPtr); - else { - const BYTE* p = (const BYTE*)memPtr; - return (U16)(p[0] + (p[1]<<8)); - } -} - -MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) -{ - if (MEM_isLittleEndian()) { - MEM_write16(memPtr, val); - } else { - BYTE* p = (BYTE*)memPtr; - p[0] = (BYTE)val; - p[1] = (BYTE)(val>>8); - } -} - -MEM_STATIC U32 MEM_readLE24(const void* memPtr) -{ - return MEM_readLE16(memPtr) + (((const BYTE*)memPtr)[2] << 16); -} - -MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val) -{ - MEM_writeLE16(memPtr, (U16)val); - ((BYTE*)memPtr)[2] = (BYTE)(val>>16); -} - -MEM_STATIC U32 MEM_readLE32(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_read32(memPtr); - else - return MEM_swap32(MEM_read32(memPtr)); -} - -MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32) -{ - if (MEM_isLittleEndian()) - MEM_write32(memPtr, val32); - else - MEM_write32(memPtr, MEM_swap32(val32)); -} - -MEM_STATIC U64 MEM_readLE64(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_read64(memPtr); - else - return MEM_swap64(MEM_read64(memPtr)); -} - -MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64) -{ - if (MEM_isLittleEndian()) - MEM_write64(memPtr, val64); - else - MEM_write64(memPtr, MEM_swap64(val64)); -} - -MEM_STATIC size_t MEM_readLEST(const void* memPtr) -{ - if (MEM_32bits()) - return (size_t)MEM_readLE32(memPtr); - else - return (size_t)MEM_readLE64(memPtr); -} - -MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val) -{ - if (MEM_32bits()) - MEM_writeLE32(memPtr, (U32)val); - else - MEM_writeLE64(memPtr, (U64)val); -} - -/*=== Big endian r/w ===*/ - -MEM_STATIC U32 MEM_readBE32(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_swap32(MEM_read32(memPtr)); - else - return MEM_read32(memPtr); -} - -MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32) -{ - if (MEM_isLittleEndian()) - MEM_write32(memPtr, MEM_swap32(val32)); - else - MEM_write32(memPtr, val32); -} - -MEM_STATIC U64 MEM_readBE64(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_swap64(MEM_read64(memPtr)); - else - return MEM_read64(memPtr); -} - -MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64) -{ - if (MEM_isLittleEndian()) - MEM_write64(memPtr, MEM_swap64(val64)); - else - MEM_write64(memPtr, val64); -} - -MEM_STATIC size_t MEM_readBEST(const void* memPtr) -{ - if (MEM_32bits()) - return (size_t)MEM_readBE32(memPtr); - else - return (size_t)MEM_readBE64(memPtr); -} - -MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val) -{ - if (MEM_32bits()) - MEM_writeBE32(memPtr, (U32)val); - else - MEM_writeBE64(memPtr, (U64)val); -} - - -#if defined (__cplusplus) -} -#endif - -#endif /* MEM_H_MODULE */ |