Initialer Commit

CPP/7zip/Compress/DeflateConst.h

@@ -0,0 +1,131 @@
+// DeflateConst.h
+
+#ifndef __DEFLATE_CONST_H
+#define __DEFLATE_CONST_H
+
+namespace NCompress {
+namespace NDeflate {
+
+const unsigned kNumHuffmanBits = 15;
+
+const UInt32 kHistorySize32 = (1 << 15);
+const UInt32 kHistorySize64 = (1 << 16);
+
+const unsigned kDistTableSize32 = 30;
+const unsigned kDistTableSize64 = 32;
+  
+const unsigned kNumLenSymbols32 = 256;
+const unsigned kNumLenSymbols64 = 255; // don't change it. It must be <= 255.
+const unsigned kNumLenSymbolsMax = kNumLenSymbols32;
+  
+const unsigned kNumLenSlots = 29;
+
+const unsigned kFixedDistTableSize = 32;
+const unsigned kFixedLenTableSize = 31;
+
+const unsigned kSymbolEndOfBlock = 0x100;
+const unsigned kSymbolMatch = kSymbolEndOfBlock + 1;
+
+const unsigned kMainTableSize = kSymbolMatch + kNumLenSlots;
+const unsigned kFixedMainTableSize = kSymbolMatch + kFixedLenTableSize;
+
+const unsigned kLevelTableSize = 19;
+
+const unsigned kTableDirectLevels = 16;
+const unsigned kTableLevelRepNumber = kTableDirectLevels;
+const unsigned kTableLevel0Number = kTableLevelRepNumber + 1;
+const unsigned kTableLevel0Number2 = kTableLevel0Number + 1;
+
+const unsigned 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 unsigned kMatchMinLen = 3;
+const unsigned kMatchMaxLen32 = kNumLenSymbols32 + kMatchMinLen - 1; // 256 + 2
+const unsigned kMatchMaxLen64 = kNumLenSymbols64 + kMatchMinLen - 1; // 255 + 2
+const unsigned kMatchMaxLen = kMatchMaxLen32;
+
+const unsigned kFinalBlockFieldSize = 1;
+
+namespace NFinalBlockField
+{
+  enum
+  {
+    kNotFinalBlock = 0,
+    kFinalBlock = 1
+  };
+}
+
+const unsigned kBlockTypeFieldSize = 2;
+
+namespace NBlockType
+{
+  enum
+  {
+    kStored = 0,
+    kFixedHuffman = 1,
+    kDynamicHuffman = 2
+  };
+}
+
+const unsigned kNumLenCodesFieldSize = 5;
+const unsigned kNumDistCodesFieldSize = 5;
+const unsigned kNumLevelCodesFieldSize = 4;
+
+const unsigned kNumLitLenCodesMin = 257;
+const unsigned kNumDistCodesMin = 1;
+const unsigned kNumLevelCodesMin = 4;
+
+const unsigned kLevelFieldSize = 3;
+
+const unsigned kStoredBlockLengthFieldSize = 16;
+
+struct CLevels
+{
+  Byte litLenLevels[kFixedMainTableSize];
+  Byte distLevels[kFixedDistTableSize];
+
+  void SubClear()
+  {
+    unsigned i;
+    for (i = kNumLitLenCodesMin; i < kFixedMainTableSize; i++)
+      litLenLevels[i] = 0;
+    for (i = 0; i < kFixedDistTableSize; i++)
+      distLevels[i] = 0;
+  }
+
+  void SetFixedLevels()
+  {
+    unsigned i = 0;
+    
+    for (; 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