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/*****************************************************************************/
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/* huffman.h Copyright (c) Ladislav Zezula 2003 */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Date Ver Who Comment */
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/* -------- ---- --- ------- */
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/* xx.xx.xx 1.00 Lad The first version of huffman.h */
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/* 03.05.03 2.00 Lad Added compression */
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/*****************************************************************************/
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//-----------------------------------------------------------------------------
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#define SWITCH_ITEMS 2 // Switch the item1 and item2
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#define PTR_NOT(ptr) (THTreeItem *)(~(uint32_t)(ptr))
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#define PTR_PTR(ptr) ((THTreeItem *)(ptr))
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#define PTR_INT(ptr) (long)(ptr)
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//-----------------------------------------------------------------------------
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// Structures and classes
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// Input stream for Huffmann decompression
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TInputStream(uint8_t *data, uint32_t data_size) {
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this->buffer_bit_size = ((int64_t)data_size) << 3;
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void ConsumeBits(uint32_t count);
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int64_t buffer_bit_size;
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// Output stream for Huffmann compression
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void PutBits(unsigned long dwBuff, unsigned int nPutBits);
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unsigned char * pbOutBuffer; // 00 : Output buffer
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unsigned long dwOutSize; // 04 : Size of output buffer
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unsigned char * pbOutPos; // 08 : Current output position
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unsigned long dwBitBuff; // 0C : Bit buffer
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unsigned long nBits; // 10 : Number of bits in the bit buffer
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// Huffmann tree item (?)
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THTreeItem * Call1501DB70(THTreeItem * pLast);
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THTreeItem * GetPrevItem(long value);
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void ClearItemLinks();
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THTreeItem * next; // 00 - Pointer to next THTreeItem
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THTreeItem * prev; // 04 - Pointer to prev THTreeItem (< 0 if none)
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unsigned long dcmpByte; // 08 - Index of this item in item pointer array, decompressed byte value
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unsigned long byteValue; // 0C - Some byte value
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THTreeItem * parent; // 10 - Pointer to parent THTreeItem (NULL if none)
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THTreeItem * child; // 14 - Pointer to child THTreeItem
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// Structure used for quick decompress. The 'bitCount' contains number of bits
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// and byte value contains result decompressed byte value.
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// After each walk through Huffman tree are filled all entries which are
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// multiplies of number of bits loaded from input stream. These entries
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// contain number of bits and result value. At the next 7 bits is tested this
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// structure first. If corresponding entry found, decompression routine will
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// not walk through Huffman tree and directly stores output byte to output stream.
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unsigned long offs00; // 00 - 1 if resolved
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unsigned long nBits; // 04 - Bit count
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unsigned long dcmpByte; // 08 - Byte value for decompress (if bitCount <= 7)
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THTreeItem * pItem; // 08 - THTreeItem (if number of bits is greater than 7
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// Structure for Huffman tree (Size 0x3674 bytes). Because I'm not expert
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// for the decompression, I do not know actually if the class is really a Hufmann
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// tree. If someone knows the decompression details, please let me know
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void InitTree(bool bCompression);
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void BuildTree(unsigned int nCmpType);
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// void ModifyTree(unsigned long dwIndex);
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// void UninitTree();
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// void Call15007010(Bit32 dwInLength, THTreeItem * item);
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THTreeItem * Call1500E740(unsigned int nValue);
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void Call1500E820(THTreeItem * pItem);
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unsigned int DoCompression(TOutputStream * os, unsigned char * pbInBuffer, int nInLength, int nCmpType);
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unsigned int DoDecompression(unsigned char * pbOutBuffer, unsigned int dwOutLength, TInputStream * is);
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unsigned long bIsCmp0; // 0000 - 1 if compression type 0
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unsigned long offs0004; // 0004 - Some flag
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THTreeItem items0008[0x203]; // 0008 - HTree items
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//- Sometimes used as HTree item -----------
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THTreeItem * pItem3050; // 3050 - Always NULL (?)
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THTreeItem * pItem3054; // 3054 - Pointer to Huffman tree item
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THTreeItem * pItem3058; // 3058 - Pointer to Huffman tree item (< 0 if invalid)
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//- Sometimes used as HTree item -----------
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THTreeItem * pItem305C; // 305C - Usually NULL
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THTreeItem * pFirst; // 3060 - Pointer to top (first) Huffman tree item
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THTreeItem * pLast; // 3064 - Pointer to bottom (last) Huffman tree item (< 0 if invalid)
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unsigned long nItems; // 3068 - Number of used HTree items
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//-------------------------------------------
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THTreeItem * items306C[0x102]; // 306C - THTreeItem pointer array
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TQDecompress qd3474[0x80]; // 3474 - Array for quick decompression
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static unsigned char Table1502A630[];// Some table
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#endif // __HUFFMAN_H__
added
removed
stormlib2/huffman/huffman.h
