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This commit is contained in:
Igor Pavlov
2011-04-11 00:00:00 +00:00
committed by Kornel Lesiński
parent de4f8c22fe
commit 35596517f2
322 changed files with 9989 additions and 7759 deletions
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65
C/7zCrc.c
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@@ -1,15 +1,24 @@
/* 7zCrc.c -- CRC32 calculation
2009-11-23 : Igor Pavlov : Public domain */
/* 7zCrc.c -- CRC32 init
2010-12-01 : Igor Pavlov : Public domain */
#include "7zCrc.h"
#include "CpuArch.h"
#define kCrcPoly 0xEDB88320
#ifdef MY_CPU_LE
#define CRC_NUM_TABLES 8
#ifdef MY_CPU_X86_OR_AMD64
#define CRC_NUM_TABLES 8
UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table);
#elif defined(MY_CPU_LE)
#define CRC_NUM_TABLES 4
#else
#define CRC_NUM_TABLES 1
#define CRC_NUM_TABLES 5
#define CRC_UINT32_SWAP(v) ((v >> 24) | ((v >> 8) & 0xFF00) | ((v << 8) & 0xFF0000) | (v << 24))
UInt32 MY_FAST_CALL CrcUpdateT1_BeT4(UInt32 v, const void *data, size_t size, const UInt32 *table);
#endif
#ifndef MY_CPU_BE
UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table);
#endif
typedef UInt32 (MY_FAST_CALL *CRC_FUNC)(UInt32 v, const void *data, size_t size, const UInt32 *table);
@@ -17,25 +26,6 @@ typedef UInt32 (MY_FAST_CALL *CRC_FUNC)(UInt32 v, const void *data, size_t size,
static CRC_FUNC g_CrcUpdate;
UInt32 g_CrcTable[256 * CRC_NUM_TABLES];
#if CRC_NUM_TABLES == 1
#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
static UInt32 MY_FAST_CALL CrcUpdateT1(UInt32 v, const void *data, size_t size, const UInt32 *table)
{
const Byte *p = (const Byte *)data;
for (; size > 0; size--, p++)
v = CRC_UPDATE_BYTE_2(v, *p);
return v;
}
#else
UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table);
UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table);
#endif
UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
{
return g_CrcUpdate(v, data, size, g_CrcTable);
@@ -57,18 +47,37 @@ void MY_FAST_CALL CrcGenerateTable()
r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
g_CrcTable[i] = r;
}
#if CRC_NUM_TABLES == 1
g_CrcUpdate = CrcUpdateT1;
#else
for (; i < 256 * CRC_NUM_TABLES; i++)
{
UInt32 r = g_CrcTable[i - 256];
g_CrcTable[i] = g_CrcTable[r & 0xFF] ^ (r >> 8);
}
#ifdef MY_CPU_LE
g_CrcUpdate = CrcUpdateT4;
#ifdef MY_CPU_X86_OR_AMD64
#if CRC_NUM_TABLES == 8
if (!CPU_Is_InOrder())
g_CrcUpdate = CrcUpdateT8;
#endif
#else
{
#ifndef MY_CPU_BE
UInt32 k = 1;
if (*(const Byte *)&k == 1)
g_CrcUpdate = CrcUpdateT4;
else
#endif
{
for (i = 256 * CRC_NUM_TABLES - 1; i >= 256; i--)
{
UInt32 x = g_CrcTable[i - 256];
g_CrcTable[i] = CRC_UINT32_SWAP(x);
}
g_CrcUpdate = CrcUpdateT1_BeT4;
}
}
#endif
}