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47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#pragma once
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#include "fs_files.h"
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namespace FileSys {
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class FZipExploder
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{
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unsigned int Hold, Bits;
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FileReader *In;
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unsigned int InLeft;
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/****************************************************************
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Shannon-Fano tree structures, variables and related routines
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****************************************************************/
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struct HuffNode
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{
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unsigned char Value;
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unsigned char Length;
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unsigned short ChildTable;
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};
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struct TableBuilder
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{
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unsigned char Value;
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unsigned char Length;
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unsigned short Code;
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};
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TArray<HuffNode> LiteralDecoder;
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TArray<HuffNode> DistanceDecoder;
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TArray<HuffNode> LengthDecoder;
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unsigned char ReadBuf[256];
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unsigned int bs, be;
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static int buildercmp(const void *a, const void *b);
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void InsertCode(TArray<HuffNode> &decoder, unsigned int pos, int bits, unsigned short code, int len, unsigned char value);
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unsigned int InitTable(TArray<HuffNode> &decoder, int numspots);
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int BuildDecoder(TArray<HuffNode> &decoder, TableBuilder *values, int numvals);
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int DecodeSFValue(const TArray<HuffNode> ¤tTree);
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int DecodeSF(TArray<HuffNode> &decoder, int numvals);
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public:
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int Explode(unsigned char *out, unsigned int outsize, FileReader &in, unsigned int insize, int flags);
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};
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int ShrinkLoop(unsigned char *out, unsigned int outsize, FileReader &in, unsigned int insize);
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}
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