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/* Lzma2Dec.h -- LZMA2 Decoder
2018-02-19 : Igor Pavlov : Public domain */
#ifndef __LZMA2_DEC_H
#define __LZMA2_DEC_H
#include "LzmaDec.h"
EXTERN_C_BEGIN
/* ---------- State Interface ---------- */
typedef struct
{
unsigned state;
Byte control;
Byte needInitLevel;
Byte isExtraMode;
Byte _pad_;
UInt32 packSize;
UInt32 unpackSize;
CLzmaDec decoder;
} CLzma2Dec;
#define Lzma2Dec_Construct(p) LzmaDec_Construct(&(p)->decoder)
#define Lzma2Dec_FreeProbs(p, alloc) LzmaDec_FreeProbs(&(p)->decoder, alloc)
#define Lzma2Dec_Free(p, alloc) LzmaDec_Free(&(p)->decoder, alloc)
SRes Lzma2Dec_AllocateProbs(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc);
SRes Lzma2Dec_Allocate(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc);
void Lzma2Dec_Init(CLzma2Dec *p);
/*
finishMode:
It has meaning only if the decoding reaches output limit (*destLen or dicLimit).
LZMA_FINISH_ANY - use smallest number of input bytes
LZMA_FINISH_END - read EndOfStream marker after decoding
Returns:
SZ_OK
status:
LZMA_STATUS_FINISHED_WITH_MARK
LZMA_STATUS_NOT_FINISHED
LZMA_STATUS_NEEDS_MORE_INPUT
SZ_ERROR_DATA - Data error
*/
SRes Lzma2Dec_DecodeToDic(CLzma2Dec *p, SizeT dicLimit,
const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
SRes Lzma2Dec_DecodeToBuf(CLzma2Dec *p, Byte *dest, SizeT *destLen,
const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
/* ---------- LZMA2 block and chunk parsing ---------- */
/*
Lzma2Dec_Parse() parses compressed data stream up to next independent block or next chunk data.
It can return LZMA_STATUS_* code or LZMA2_PARSE_STATUS_* code:
- LZMA2_PARSE_STATUS_NEW_BLOCK - there is new block, and 1 additional byte (control byte of next block header) was read from input.
- LZMA2_PARSE_STATUS_NEW_CHUNK - there is new chunk, and only lzma2 header of new chunk was read.
CLzma2Dec::unpackSize contains unpack size of that chunk
*/
typedef enum
{
/*
LZMA_STATUS_NOT_SPECIFIED // data error
LZMA_STATUS_FINISHED_WITH_MARK
LZMA_STATUS_NOT_FINISHED //
LZMA_STATUS_NEEDS_MORE_INPUT
LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK // unused
*/
LZMA2_PARSE_STATUS_NEW_BLOCK = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK + 1,
LZMA2_PARSE_STATUS_NEW_CHUNK
} ELzma2ParseStatus;
ELzma2ParseStatus Lzma2Dec_Parse(CLzma2Dec *p,
SizeT outSize, // output size
const Byte *src, SizeT *srcLen,
int checkFinishBlock // set (checkFinishBlock = 1), if it must read full input data, if decoder.dicPos reaches blockMax position.
);
/*
LZMA2 parser doesn't decode LZMA chunks, so we must read
full input LZMA chunk to decode some part of LZMA chunk.
Lzma2Dec_GetUnpackExtra() returns the value that shows
max possible number of output bytes that can be output by decoder
at current input positon.
*/
#define Lzma2Dec_GetUnpackExtra(p) ((p)->isExtraMode ? (p)->unpackSize : 0);
/* ---------- One Call Interface ---------- */
/*
finishMode:
It has meaning only if the decoding reaches output limit (*destLen).
LZMA_FINISH_ANY - use smallest number of input bytes
LZMA_FINISH_END - read EndOfStream marker after decoding
Returns:
SZ_OK
status:
LZMA_STATUS_FINISHED_WITH_MARK
LZMA_STATUS_NOT_FINISHED
SZ_ERROR_DATA - Data error
SZ_ERROR_MEM - Memory allocation error
SZ_ERROR_UNSUPPORTED - Unsupported properties
SZ_ERROR_INPUT_EOF - It needs more bytes in input buffer (src).
*/
SRes Lzma2Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
Byte prop, ELzmaFinishMode finishMode, ELzmaStatus *status, ISzAllocPtr alloc);
EXTERN_C_END
#endif
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