misc/libphysfs/lzma/C/7zCrcT8.c
author Wuzzy <almikes@aol.com>
Thu, 21 Sep 2017 22:51:36 +0200
changeset 12484 943f74b7a4b9
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permissions -rw-r--r--
Tweak the network and lag icons to be closer to Hedgewars style
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/* 7zCrcT8.c */
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#include "7zCrc.h"
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#define kCrcPoly 0xEDB88320
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#define CRC_NUM_TABLES 8
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UInt32 g_CrcTable[256 * CRC_NUM_TABLES];
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void MY_FAST_CALL CrcGenerateTable()
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{
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  UInt32 i;
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  for (i = 0; i < 256; i++)
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  {
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    UInt32 r = i;
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    int j;
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    for (j = 0; j < 8; j++)
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      r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
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    g_CrcTable[i] = r;
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  }
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  #if CRC_NUM_TABLES > 1
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  for (; i < 256 * CRC_NUM_TABLES; i++)
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  {
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    UInt32 r = g_CrcTable[i - 256];
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    g_CrcTable[i] = g_CrcTable[r & 0xFF] ^ (r >> 8);
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  }
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  #endif
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}
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UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table);
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UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
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{
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  return CrcUpdateT8(v, data, size, g_CrcTable);
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}
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UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size)
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{
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  return CrcUpdateT8(CRC_INIT_VAL, data, size, g_CrcTable) ^ 0xFFFFFFFF;
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}