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Diffstat (limited to 'CPP/7zip/Compress/DeflateConst.h')
-rwxr-xr-x | CPP/7zip/Compress/DeflateConst.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/CPP/7zip/Compress/DeflateConst.h b/CPP/7zip/Compress/DeflateConst.h new file mode 100755 index 00000000..00e5ab8b --- /dev/null +++ b/CPP/7zip/Compress/DeflateConst.h @@ -0,0 +1,134 @@ +// DeflateConst.h + +#ifndef __DEFLATE_CONST_H +#define __DEFLATE_CONST_H + +namespace NCompress { +namespace NDeflate { + +const int kNumHuffmanBits = 15; + +const UInt32 kHistorySize32 = (1 << 15); +const UInt32 kHistorySize64 = (1 << 16); + +const UInt32 kDistTableSize32 = 30; +const UInt32 kDistTableSize64 = 32; + +const UInt32 kNumLenSymbols32 = 256; +const UInt32 kNumLenSymbols64 = 255; // don't change it. It must be <= 255. +const UInt32 kNumLenSymbolsMax = kNumLenSymbols32; + +const UInt32 kNumLenSlots = 29; + +const UInt32 kFixedDistTableSize = 32; +const UInt32 kFixedLenTableSize = 31; + +const UInt32 kSymbolEndOfBlock = 0x100; +const UInt32 kSymbolMatch = kSymbolEndOfBlock + 1; + +const UInt32 kMainTableSize = kSymbolMatch + kNumLenSlots; +const UInt32 kFixedMainTableSize = kSymbolMatch + kFixedLenTableSize; + +const UInt32 kLevelTableSize = 19; + +const UInt32 kTableDirectLevels = 16; +const UInt32 kTableLevelRepNumber = kTableDirectLevels; +const UInt32 kTableLevel0Number = kTableLevelRepNumber + 1; +const UInt32 kTableLevel0Number2 = kTableLevel0Number + 1; + +const UInt32 kLevelMask = 0xF; + +const Byte kLenStart32[kFixedLenTableSize] = + {0,1,2,3,4,5,6,7,8,10,12,14,16,20,24,28,32,40,48,56,64,80,96,112,128,160,192,224, 255, 0, 0}; +const Byte kLenStart64[kFixedLenTableSize] = + {0,1,2,3,4,5,6,7,8,10,12,14,16,20,24,28,32,40,48,56,64,80,96,112,128,160,192,224, 0, 0, 0}; + +const Byte kLenDirectBits32[kFixedLenTableSize] = + {0,0,0,0,0,0,0,0,1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 0, 0}; +const Byte kLenDirectBits64[kFixedLenTableSize] = + {0,0,0,0,0,0,0,0,1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 16, 0, 0}; + +const UInt32 kDistStart[kDistTableSize64] = + {0,1,2,3,4,6,8,12,16,24,32,48,64,96,128,192,256,384,512,768, + 1024,1536,2048,3072,4096,6144,8192,12288,16384,24576,32768,49152}; +const Byte kDistDirectBits[kDistTableSize64] = + {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14}; + +const Byte kLevelDirectBits[3] = {2, 3, 7}; + +const Byte kCodeLengthAlphabetOrder[kLevelTableSize] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; + +const UInt32 kMatchMinLen = 3; +const UInt32 kMatchMaxLen32 = kNumLenSymbols32 + kMatchMinLen - 1; //256 + 2 +const UInt32 kMatchMaxLen64 = kNumLenSymbols64 + kMatchMinLen - 1; //255 + 2 +const UInt32 kMatchMaxLen = kMatchMaxLen32; + +const int kFinalBlockFieldSize = 1; + +namespace NFinalBlockField +{ + enum + { + kNotFinalBlock = 0, + kFinalBlock = 1 + }; +} + +const int kBlockTypeFieldSize = 2; + +namespace NBlockType +{ + enum + { + kStored = 0, + kFixedHuffman = 1, + kDynamicHuffman = 2 + }; +} + +const int kNumLenCodesFieldSize = 5; +const int kNumDistCodesFieldSize = 5; +const int kNumLevelCodesFieldSize = 4; + +const UInt32 kNumLitLenCodesMin = 257; +const UInt32 kNumDistCodesMin = 1; +const UInt32 kNumLevelCodesMin = 4; + +const int kLevelFieldSize = 3; + +const int kStoredBlockLengthFieldSize = 16; + +struct CLevels +{ + Byte litLenLevels[kFixedMainTableSize]; + Byte distLevels[kFixedDistTableSize]; + + void SubClear() + { + UInt32 i; + for(i = kNumLitLenCodesMin; i < kFixedMainTableSize; i++) + litLenLevels[i] = 0; + for(i = 0; i < kFixedDistTableSize; i++) + distLevels[i] = 0; + } + + void SetFixedLevels() + { + int i; + + for (i = 0; i < 144; i++) + litLenLevels[i] = 8; + for (; i < 256; i++) + litLenLevels[i] = 9; + for (; i < 280; i++) + litLenLevels[i] = 7; + for (; i < 288; i++) + litLenLevels[i] = 8; + for (i = 0; i < kFixedDistTableSize; i++) // test it: InfoZip only uses kDistTableSize + distLevels[i] = 5; + } +}; + +}} + +#endif |