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274 lines
7.3 KiB
274 lines
7.3 KiB
// This CRC function is based on Intel Slicing-by-8 algorithm.
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//
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// Original Intel Slicing-by-8 code is available here:
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//
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// http://sourceforge.net/projects/slicing-by-8/
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//
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// Original Intel Slicing-by-8 code is licensed as:
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//
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// Copyright (c) 2004-2006 Intel Corporation - All Rights Reserved
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//
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// This software program is licensed subject to the BSD License,
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// available at http://www.opensource.org/licenses/bsd-license.html
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#include "rar.hpp"
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#ifndef SFX_MODULE
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// User suggested to avoid BSD license in SFX module, so they do not need
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// to include the license to SFX archive.
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#define USE_SLICING
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#endif
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static uint crc_tables[8][256]; // Tables for Slicing-by-8.
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// Build the classic CRC32 lookup table.
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// We also provide this function to legacy RAR and ZIP decryption code.
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void InitCRC32(uint *CRCTab)
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{
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if (CRCTab[1]!=0)
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return;
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for (uint I=0;I<256;I++)
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{
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uint C=I;
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for (uint J=0;J<8;J++)
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C=(C & 1) ? (C>>1)^0xEDB88320 : (C>>1);
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CRCTab[I]=C;
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}
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}
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static void InitTables()
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{
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InitCRC32(crc_tables[0]);
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#ifdef USE_SLICING
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for (uint I=0;I<256;I++) // Build additional lookup tables.
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{
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uint C=crc_tables[0][I];
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for (uint J=1;J<8;J++)
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{
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C=crc_tables[0][(byte)C]^(C>>8);
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crc_tables[J][I]=C;
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}
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}
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#endif
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}
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struct CallInitCRC {CallInitCRC() {InitTables();}} static CallInit32;
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uint CRC32(uint StartCRC,const void *Addr,size_t Size)
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{
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byte *Data=(byte *)Addr;
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#ifdef USE_SLICING
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// Align Data to 8 for better performance.
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for (;Size>0 && ((size_t)Data & 7);Size--,Data++)
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StartCRC=crc_tables[0][(byte)(StartCRC^Data[0])]^(StartCRC>>8);
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for (;Size>=8;Size-=8,Data+=8)
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{
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#ifdef BIG_ENDIAN
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StartCRC ^= Data[0]|(Data[1] << 8)|(Data[2] << 16)|(Data[3] << 24);
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uint NextData = Data[4]|(Data[5] << 8)|(Data[6] << 16)|(Data[7] << 24);
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#else
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StartCRC ^= *(uint32 *) Data;
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uint NextData = *(uint32 *) (Data+4);
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#endif
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StartCRC = crc_tables[7][(byte) StartCRC ] ^
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crc_tables[6][(byte)(StartCRC >> 8) ] ^
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crc_tables[5][(byte)(StartCRC >> 16)] ^
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crc_tables[4][(byte)(StartCRC >> 24)] ^
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crc_tables[3][(byte) NextData ] ^
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crc_tables[2][(byte)(NextData >> 8) ] ^
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crc_tables[1][(byte)(NextData >> 16)] ^
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crc_tables[0][(byte)(NextData >> 24)];
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}
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#endif
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for (;Size>0;Size--,Data++) // Process left data.
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StartCRC=crc_tables[0][(byte)(StartCRC^Data[0])]^(StartCRC>>8);
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return StartCRC;
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}
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#ifndef SFX_MODULE
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// For RAR 1.4 archives in case somebody still has them.
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ushort Checksum14(ushort StartCRC,const void *Addr,size_t Size)
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{
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byte *Data=(byte *)Addr;
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for (size_t I=0;I<Size;I++)
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{
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StartCRC=(StartCRC+Data[I])&0xffff;
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StartCRC=((StartCRC<<1)|(StartCRC>>15))&0xffff;
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}
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return StartCRC;
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}
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#endif
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#if 0
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static uint64 crc64_tables[8][256]; // Tables for Slicing-by-8 for CRC64.
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void InitCRC64(uint64 *CRCTab)
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{
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const uint64 poly=INT32TO64(0xC96C5795, 0xD7870F42); // 0xC96C5795D7870F42;
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for (uint I=0;I<256;I++)
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{
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uint64 C=I;
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for (uint J=0;J<8;J++)
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C=(C & 1) ? (C>>1)^poly: (C>>1);
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CRCTab[I]=C;
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}
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}
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static void InitTables64()
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{
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InitCRC64(crc64_tables[0]);
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for (uint I=0;I<256;I++) // Build additional lookup tables.
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{
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uint64 C=crc64_tables[0][I];
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for (uint J=1;J<8;J++)
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{
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C=crc64_tables[0][(byte)C]^(C>>8);
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crc64_tables[J][I]=C;
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}
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}
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}
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// We cannot place the intialization to CRC64(), because we use this function
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// in multithreaded mode and it conflicts with multithreading.
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struct CallInitCRC64 {CallInitCRC64() {InitTables64();}} static CallInit64;
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uint64 CRC64(uint64 StartCRC,const void *Addr,size_t Size)
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{
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byte *Data=(byte *)Addr;
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// Align Data to 8 for better performance.
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for (;Size>0 && ((size_t)Data & 7)!=0;Size--,Data++)
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StartCRC=crc64_tables[0][(byte)(StartCRC^Data[0])]^(StartCRC>>8);
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for (byte *DataEnd=Data+Size/8*8; Data<DataEnd; Data+=8 )
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{
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uint64 Index=StartCRC;
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#ifdef BIG_ENDIAN
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Index ^= (uint64(Data[0])|(uint64(Data[1])<<8)|(uint64(Data[2])<<16)|(uint64(Data[3])<<24))|
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(uint64(Data[4])<<32)|(uint64(Data[5])<<40)|(uint64(Data[6])<<48)|(uint64(Data[7])<<56);
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#else
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Index ^= *(uint64 *)Data;
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#endif
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StartCRC = crc64_tables[ 7 ] [ ( byte ) (Index ) ] ^
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crc64_tables[ 6 ] [ ( byte ) (Index >> 8 ) ] ^
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crc64_tables[ 5 ] [ ( byte ) (Index >> 16 ) ] ^
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crc64_tables[ 4 ] [ ( byte ) (Index >> 24 ) ] ^
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crc64_tables[ 3 ] [ ( byte ) (Index >> 32 ) ] ^
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crc64_tables[ 2 ] [ ( byte ) (Index >> 40 ) ] ^
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crc64_tables[ 1 ] [ ( byte ) (Index >> 48 ) ] ^
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crc64_tables[ 0 ] [ ( byte ) (Index >> 56 ) ] ;
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}
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for (Size%=8;Size>0;Size--,Data++) // Process left data.
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StartCRC=crc64_tables[0][(byte)(StartCRC^Data[0])]^(StartCRC>>8);
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return StartCRC;
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}
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#if 0
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static void TestCRC();
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struct TestCRCStruct {TestCRCStruct() {TestCRC();exit(0);}} GlobalTesCRC;
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void TestCRC()
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{
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const uint FirstSize=300;
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byte b[FirstSize];
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if ((CRC32(0xffffffff,(byte*)"testtesttest",12)^0xffffffff)==0x44608e84)
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mprintf(L"\nCRC32 test1 OK");
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else
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mprintf(L"\nCRC32 test1 FAILED");
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if (CRC32(0,(byte*)"te\x80st",5)==0xB2E5C5AE)
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mprintf(L"\nCRC32 test2 OK");
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else
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mprintf(L"\nCRC32 test2 FAILED");
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for (uint I=0;I<14;I++) // Check for possible int sign extension.
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b[I]=(byte)0x7f+I;
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if ((CRC32(0xffffffff,b,14)^0xffffffff)==0x1DFA75DA)
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mprintf(L"\nCRC32 test3 OK");
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else
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mprintf(L"\nCRC32 test3 FAILED");
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for (uint I=0;I<FirstSize;I++)
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b[I]=(byte)I;
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uint r32=CRC32(0xffffffff,b,FirstSize);
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for (uint I=FirstSize;I<1024;I++)
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{
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b[0]=(byte)I;
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r32=CRC32(r32,b,1);
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}
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if ((r32^0xffffffff)==0xB70B4C26)
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mprintf(L"\nCRC32 test4 OK");
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else
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mprintf(L"\nCRC32 test4 FAILED");
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if ((CRC64(0xffffffffffffffff,(byte*)"testtesttest",12)^0xffffffffffffffff)==0x7B1C2D230EDEB436)
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mprintf(L"\nCRC64 test1 OK");
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else
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mprintf(L"\nCRC64 test1 FAILED");
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if (CRC64(0,(byte*)"te\x80st",5)==0xB5DBF9583A6EED4A)
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mprintf(L"\nCRC64 test2 OK");
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else
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mprintf(L"\nCRC64 test2 FAILED");
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for (uint I=0;I<14;I++) // Check for possible int sign extension.
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b[I]=(byte)0x7f+I;
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if ((CRC64(0xffffffffffffffff,b,14)^0xffffffffffffffff)==0xE019941C05B2820C)
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mprintf(L"\nCRC64 test3 OK");
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else
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mprintf(L"\nCRC64 test3 FAILED");
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for (uint I=0;I<FirstSize;I++)
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b[I]=(byte)I;
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uint64 r64=CRC64(0xffffffffffffffff,b,FirstSize);
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for (uint I=FirstSize;I<1024;I++)
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{
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b[0]=(byte)I;
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r64=CRC64(r64,b,1);
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}
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if ((r64^0xffffffffffffffff)==0xD51FB58DC789C400)
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mprintf(L"\nCRC64 test4 OK");
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else
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mprintf(L"\nCRC64 test4 FAILED");
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const size_t BufSize=0x100000;
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byte *Buf=new byte[BufSize];
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memset(Buf,0,BufSize);
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clock_t StartTime=clock();
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r32=0xffffffff;
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const uint BufCount=5000;
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for (uint I=0;I<BufCount;I++)
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r32=CRC32(r32,Buf,BufSize);
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if (r32!=0) // Otherwise compiler optimizer removes CRC calculation.
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mprintf(L"\nCRC32 speed: %d MB/s",BufCount*1000/(clock()-StartTime));
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StartTime=clock();
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r64=0xffffffffffffffff;
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for (uint I=0;I<BufCount;I++)
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r64=CRC64(r64,Buf,BufSize);
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if (r64!=0) // Otherwise compiler optimizer removes CRC calculation.
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mprintf(L"\nCRC64 speed: %d MB/s",BufCount*1000/(clock()-StartTime));
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}
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#endif
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#endif
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