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121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/* Lzma2Dec.h -- LZMA2 Decoder
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2023-03-03 : Igor Pavlov : Public domain */
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#ifndef ZIP7_INC_LZMA2_DEC_H
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#define ZIP7_INC_LZMA2_DEC_H
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#include "LzmaDec.h"
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EXTERN_C_BEGIN
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/* ---------- State Interface ---------- */
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typedef struct
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{
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unsigned state;
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Byte control;
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Byte needInitLevel;
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Byte isExtraMode;
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Byte _pad_;
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UInt32 packSize;
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UInt32 unpackSize;
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CLzmaDec decoder;
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} CLzma2Dec;
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#define Lzma2Dec_CONSTRUCT(p) LzmaDec_CONSTRUCT(&(p)->decoder)
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#define Lzma2Dec_Construct(p) Lzma2Dec_CONSTRUCT(p)
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#define Lzma2Dec_FreeProbs(p, alloc) LzmaDec_FreeProbs(&(p)->decoder, alloc)
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#define Lzma2Dec_Free(p, alloc) LzmaDec_Free(&(p)->decoder, alloc)
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SRes Lzma2Dec_AllocateProbs(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc);
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SRes Lzma2Dec_Allocate(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc);
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void Lzma2Dec_Init(CLzma2Dec *p);
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/*
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finishMode:
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It has meaning only if the decoding reaches output limit (*destLen or dicLimit).
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LZMA_FINISH_ANY - use smallest number of input bytes
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LZMA_FINISH_END - read EndOfStream marker after decoding
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Returns:
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SZ_OK
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status:
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LZMA_STATUS_FINISHED_WITH_MARK
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LZMA_STATUS_NOT_FINISHED
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LZMA_STATUS_NEEDS_MORE_INPUT
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SZ_ERROR_DATA - Data error
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*/
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SRes Lzma2Dec_DecodeToDic(CLzma2Dec *p, SizeT dicLimit,
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const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
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SRes Lzma2Dec_DecodeToBuf(CLzma2Dec *p, Byte *dest, SizeT *destLen,
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const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
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/* ---------- LZMA2 block and chunk parsing ---------- */
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/*
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Lzma2Dec_Parse() parses compressed data stream up to next independent block or next chunk data.
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It can return LZMA_STATUS_* code or LZMA2_PARSE_STATUS_* code:
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- LZMA2_PARSE_STATUS_NEW_BLOCK - there is new block, and 1 additional byte (control byte of next block header) was read from input.
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- LZMA2_PARSE_STATUS_NEW_CHUNK - there is new chunk, and only lzma2 header of new chunk was read.
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CLzma2Dec::unpackSize contains unpack size of that chunk
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*/
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typedef enum
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{
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/*
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LZMA_STATUS_NOT_SPECIFIED // data error
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LZMA_STATUS_FINISHED_WITH_MARK
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LZMA_STATUS_NOT_FINISHED //
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LZMA_STATUS_NEEDS_MORE_INPUT
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LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK // unused
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*/
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LZMA2_PARSE_STATUS_NEW_BLOCK = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK + 1,
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LZMA2_PARSE_STATUS_NEW_CHUNK
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} ELzma2ParseStatus;
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ELzma2ParseStatus Lzma2Dec_Parse(CLzma2Dec *p,
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SizeT outSize, // output size
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const Byte *src, SizeT *srcLen,
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int checkFinishBlock // set (checkFinishBlock = 1), if it must read full input data, if decoder.dicPos reaches blockMax position.
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);
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/*
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LZMA2 parser doesn't decode LZMA chunks, so we must read
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full input LZMA chunk to decode some part of LZMA chunk.
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Lzma2Dec_GetUnpackExtra() returns the value that shows
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max possible number of output bytes that can be output by decoder
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at current input positon.
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*/
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#define Lzma2Dec_GetUnpackExtra(p) ((p)->isExtraMode ? (p)->unpackSize : 0)
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/* ---------- One Call Interface ---------- */
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/*
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finishMode:
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It has meaning only if the decoding reaches output limit (*destLen).
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LZMA_FINISH_ANY - use smallest number of input bytes
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LZMA_FINISH_END - read EndOfStream marker after decoding
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Returns:
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SZ_OK
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status:
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LZMA_STATUS_FINISHED_WITH_MARK
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LZMA_STATUS_NOT_FINISHED
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SZ_ERROR_DATA - Data error
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SZ_ERROR_MEM - Memory allocation error
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SZ_ERROR_UNSUPPORTED - Unsupported properties
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SZ_ERROR_INPUT_EOF - It needs more bytes in input buffer (src).
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*/
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SRes Lzma2Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
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Byte prop, ELzmaFinishMode finishMode, ELzmaStatus *status, ISzAllocPtr alloc);
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EXTERN_C_END
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#endif
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