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490 lines
13 KiB
C
490 lines
13 KiB
C
/* Lzma2Dec.c -- LZMA2 Decoder
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2021-02-09 : Igor Pavlov : Public domain */
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/* #define SHOW_DEBUG_INFO */
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#include "Precomp.h"
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#ifdef SHOW_DEBUG_INFO
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#include <stdio.h>
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#endif
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#include <string.h>
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#include "Lzma2Dec.h"
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/*
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00000000 - End of data
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00000001 U U - Uncompressed, reset dic, need reset state and set new prop
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00000010 U U - Uncompressed, no reset
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100uuuuu U U P P - LZMA, no reset
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101uuuuu U U P P - LZMA, reset state
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110uuuuu U U P P S - LZMA, reset state + set new prop
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111uuuuu U U P P S - LZMA, reset state + set new prop, reset dic
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u, U - Unpack Size
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P - Pack Size
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S - Props
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*/
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#define LZMA2_CONTROL_COPY_RESET_DIC 1
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#define LZMA2_IS_UNCOMPRESSED_STATE(p) (((p)->control & (1 << 7)) == 0)
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#define LZMA2_LCLP_MAX 4
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#define LZMA2_DIC_SIZE_FROM_PROP(p) (((UInt32)2 | ((p) & 1)) << ((p) / 2 + 11))
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#ifdef SHOW_DEBUG_INFO
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#define PRF(x) x
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#else
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#define PRF(x)
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#endif
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typedef enum
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{
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LZMA2_STATE_CONTROL,
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LZMA2_STATE_UNPACK0,
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LZMA2_STATE_UNPACK1,
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LZMA2_STATE_PACK0,
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LZMA2_STATE_PACK1,
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LZMA2_STATE_PROP,
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LZMA2_STATE_DATA,
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LZMA2_STATE_DATA_CONT,
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LZMA2_STATE_FINISHED,
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LZMA2_STATE_ERROR
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} ELzma2State;
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static SRes Lzma2Dec_GetOldProps(Byte prop, Byte *props)
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{
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UInt32 dicSize;
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if (prop > 40)
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return SZ_ERROR_UNSUPPORTED;
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dicSize = (prop == 40) ? 0xFFFFFFFF : LZMA2_DIC_SIZE_FROM_PROP(prop);
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props[0] = (Byte)LZMA2_LCLP_MAX;
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props[1] = (Byte)(dicSize);
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props[2] = (Byte)(dicSize >> 8);
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props[3] = (Byte)(dicSize >> 16);
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props[4] = (Byte)(dicSize >> 24);
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return SZ_OK;
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}
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SRes Lzma2Dec_AllocateProbs(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc)
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{
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Byte props[LZMA_PROPS_SIZE];
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RINOK(Lzma2Dec_GetOldProps(prop, props));
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return LzmaDec_AllocateProbs(&p->decoder, props, LZMA_PROPS_SIZE, alloc);
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}
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SRes Lzma2Dec_Allocate(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc)
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{
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Byte props[LZMA_PROPS_SIZE];
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RINOK(Lzma2Dec_GetOldProps(prop, props));
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return LzmaDec_Allocate(&p->decoder, props, LZMA_PROPS_SIZE, alloc);
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}
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void Lzma2Dec_Init(CLzma2Dec *p)
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{
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p->state = LZMA2_STATE_CONTROL;
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p->needInitLevel = 0xE0;
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p->isExtraMode = False;
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p->unpackSize = 0;
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// p->decoder.dicPos = 0; // we can use it instead of full init
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LzmaDec_Init(&p->decoder);
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}
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// ELzma2State
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static unsigned Lzma2Dec_UpdateState(CLzma2Dec *p, Byte b)
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{
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switch (p->state)
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{
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case LZMA2_STATE_CONTROL:
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p->isExtraMode = False;
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p->control = b;
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PRF(printf("\n %8X", (unsigned)p->decoder.dicPos));
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PRF(printf(" %02X", (unsigned)b));
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if (b == 0)
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return LZMA2_STATE_FINISHED;
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if (LZMA2_IS_UNCOMPRESSED_STATE(p))
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{
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if (b == LZMA2_CONTROL_COPY_RESET_DIC)
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p->needInitLevel = 0xC0;
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else if (b > 2 || p->needInitLevel == 0xE0)
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return LZMA2_STATE_ERROR;
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}
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else
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{
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if (b < p->needInitLevel)
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return LZMA2_STATE_ERROR;
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p->needInitLevel = 0;
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p->unpackSize = (UInt32)(b & 0x1F) << 16;
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}
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return LZMA2_STATE_UNPACK0;
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case LZMA2_STATE_UNPACK0:
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p->unpackSize |= (UInt32)b << 8;
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return LZMA2_STATE_UNPACK1;
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case LZMA2_STATE_UNPACK1:
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p->unpackSize |= (UInt32)b;
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p->unpackSize++;
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PRF(printf(" %7u", (unsigned)p->unpackSize));
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return LZMA2_IS_UNCOMPRESSED_STATE(p) ? LZMA2_STATE_DATA : LZMA2_STATE_PACK0;
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case LZMA2_STATE_PACK0:
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p->packSize = (UInt32)b << 8;
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return LZMA2_STATE_PACK1;
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case LZMA2_STATE_PACK1:
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p->packSize |= (UInt32)b;
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p->packSize++;
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// if (p->packSize < 5) return LZMA2_STATE_ERROR;
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PRF(printf(" %5u", (unsigned)p->packSize));
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return (p->control & 0x40) ? LZMA2_STATE_PROP : LZMA2_STATE_DATA;
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case LZMA2_STATE_PROP:
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{
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unsigned lc, lp;
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if (b >= (9 * 5 * 5))
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return LZMA2_STATE_ERROR;
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lc = b % 9;
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b /= 9;
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p->decoder.prop.pb = (Byte)(b / 5);
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lp = b % 5;
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if (lc + lp > LZMA2_LCLP_MAX)
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return LZMA2_STATE_ERROR;
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p->decoder.prop.lc = (Byte)lc;
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p->decoder.prop.lp = (Byte)lp;
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return LZMA2_STATE_DATA;
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}
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}
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return LZMA2_STATE_ERROR;
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}
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static void LzmaDec_UpdateWithUncompressed(CLzmaDec *p, const Byte *src, SizeT size)
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{
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memcpy(p->dic + p->dicPos, src, size);
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p->dicPos += size;
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if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= size)
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p->checkDicSize = p->prop.dicSize;
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p->processedPos += (UInt32)size;
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}
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void LzmaDec_InitDicAndState(CLzmaDec *p, BoolInt initDic, BoolInt initState);
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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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{
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SizeT inSize = *srcLen;
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*srcLen = 0;
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*status = LZMA_STATUS_NOT_SPECIFIED;
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while (p->state != LZMA2_STATE_ERROR)
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{
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SizeT dicPos;
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if (p->state == LZMA2_STATE_FINISHED)
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{
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*status = LZMA_STATUS_FINISHED_WITH_MARK;
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return SZ_OK;
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}
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dicPos = p->decoder.dicPos;
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if (dicPos == dicLimit && finishMode == LZMA_FINISH_ANY)
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{
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*status = LZMA_STATUS_NOT_FINISHED;
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return SZ_OK;
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}
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if (p->state != LZMA2_STATE_DATA && p->state != LZMA2_STATE_DATA_CONT)
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{
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if (*srcLen == inSize)
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{
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*status = LZMA_STATUS_NEEDS_MORE_INPUT;
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return SZ_OK;
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}
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(*srcLen)++;
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p->state = Lzma2Dec_UpdateState(p, *src++);
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if (dicPos == dicLimit && p->state != LZMA2_STATE_FINISHED)
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break;
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continue;
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}
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{
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SizeT inCur = inSize - *srcLen;
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SizeT outCur = dicLimit - dicPos;
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ELzmaFinishMode curFinishMode = LZMA_FINISH_ANY;
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if (outCur >= p->unpackSize)
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{
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outCur = (SizeT)p->unpackSize;
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curFinishMode = LZMA_FINISH_END;
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}
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if (LZMA2_IS_UNCOMPRESSED_STATE(p))
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{
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if (inCur == 0)
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{
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*status = LZMA_STATUS_NEEDS_MORE_INPUT;
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return SZ_OK;
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}
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if (p->state == LZMA2_STATE_DATA)
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{
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BoolInt initDic = (p->control == LZMA2_CONTROL_COPY_RESET_DIC);
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LzmaDec_InitDicAndState(&p->decoder, initDic, False);
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}
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if (inCur > outCur)
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inCur = outCur;
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if (inCur == 0)
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break;
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LzmaDec_UpdateWithUncompressed(&p->decoder, src, inCur);
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src += inCur;
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*srcLen += inCur;
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p->unpackSize -= (UInt32)inCur;
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p->state = (p->unpackSize == 0) ? LZMA2_STATE_CONTROL : LZMA2_STATE_DATA_CONT;
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}
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else
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{
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SRes res;
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if (p->state == LZMA2_STATE_DATA)
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{
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BoolInt initDic = (p->control >= 0xE0);
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BoolInt initState = (p->control >= 0xA0);
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LzmaDec_InitDicAndState(&p->decoder, initDic, initState);
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p->state = LZMA2_STATE_DATA_CONT;
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}
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if (inCur > p->packSize)
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inCur = (SizeT)p->packSize;
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res = LzmaDec_DecodeToDic(&p->decoder, dicPos + outCur, src, &inCur, curFinishMode, status);
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src += inCur;
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*srcLen += inCur;
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p->packSize -= (UInt32)inCur;
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outCur = p->decoder.dicPos - dicPos;
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p->unpackSize -= (UInt32)outCur;
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if (res != 0)
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break;
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if (*status == LZMA_STATUS_NEEDS_MORE_INPUT)
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{
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if (p->packSize == 0)
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break;
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return SZ_OK;
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}
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if (inCur == 0 && outCur == 0)
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{
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if (*status != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
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|| p->unpackSize != 0
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|| p->packSize != 0)
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break;
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p->state = LZMA2_STATE_CONTROL;
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}
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*status = LZMA_STATUS_NOT_SPECIFIED;
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}
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}
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}
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*status = LZMA_STATUS_NOT_SPECIFIED;
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p->state = LZMA2_STATE_ERROR;
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return SZ_ERROR_DATA;
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}
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ELzma2ParseStatus Lzma2Dec_Parse(CLzma2Dec *p,
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SizeT outSize,
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const Byte *src, SizeT *srcLen,
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int checkFinishBlock)
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{
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SizeT inSize = *srcLen;
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*srcLen = 0;
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while (p->state != LZMA2_STATE_ERROR)
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{
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if (p->state == LZMA2_STATE_FINISHED)
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return (ELzma2ParseStatus)LZMA_STATUS_FINISHED_WITH_MARK;
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if (outSize == 0 && !checkFinishBlock)
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return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
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if (p->state != LZMA2_STATE_DATA && p->state != LZMA2_STATE_DATA_CONT)
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{
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if (*srcLen == inSize)
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return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
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(*srcLen)++;
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p->state = Lzma2Dec_UpdateState(p, *src++);
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if (p->state == LZMA2_STATE_UNPACK0)
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{
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// if (p->decoder.dicPos != 0)
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if (p->control == LZMA2_CONTROL_COPY_RESET_DIC || p->control >= 0xE0)
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return LZMA2_PARSE_STATUS_NEW_BLOCK;
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// if (outSize == 0) return LZMA_STATUS_NOT_FINISHED;
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}
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// The following code can be commented.
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// It's not big problem, if we read additional input bytes.
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// It will be stopped later in LZMA2_STATE_DATA / LZMA2_STATE_DATA_CONT state.
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if (outSize == 0 && p->state != LZMA2_STATE_FINISHED)
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{
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// checkFinishBlock is true. So we expect that block must be finished,
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// We can return LZMA_STATUS_NOT_SPECIFIED or LZMA_STATUS_NOT_FINISHED here
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// break;
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return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
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}
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if (p->state == LZMA2_STATE_DATA)
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return LZMA2_PARSE_STATUS_NEW_CHUNK;
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continue;
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}
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if (outSize == 0)
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return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
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{
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SizeT inCur = inSize - *srcLen;
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if (LZMA2_IS_UNCOMPRESSED_STATE(p))
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{
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if (inCur == 0)
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return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
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if (inCur > p->unpackSize)
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inCur = p->unpackSize;
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if (inCur > outSize)
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inCur = outSize;
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p->decoder.dicPos += inCur;
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src += inCur;
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*srcLen += inCur;
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outSize -= inCur;
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p->unpackSize -= (UInt32)inCur;
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p->state = (p->unpackSize == 0) ? LZMA2_STATE_CONTROL : LZMA2_STATE_DATA_CONT;
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}
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else
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{
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p->isExtraMode = True;
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if (inCur == 0)
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{
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if (p->packSize != 0)
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return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
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}
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else if (p->state == LZMA2_STATE_DATA)
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{
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p->state = LZMA2_STATE_DATA_CONT;
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if (*src != 0)
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{
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// first byte of lzma chunk must be Zero
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*srcLen += 1;
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p->packSize--;
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break;
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}
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}
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if (inCur > p->packSize)
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inCur = (SizeT)p->packSize;
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src += inCur;
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*srcLen += inCur;
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p->packSize -= (UInt32)inCur;
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if (p->packSize == 0)
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{
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SizeT rem = outSize;
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if (rem > p->unpackSize)
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rem = p->unpackSize;
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p->decoder.dicPos += rem;
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p->unpackSize -= (UInt32)rem;
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outSize -= rem;
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if (p->unpackSize == 0)
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p->state = LZMA2_STATE_CONTROL;
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}
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}
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}
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}
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p->state = LZMA2_STATE_ERROR;
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return (ELzma2ParseStatus)LZMA_STATUS_NOT_SPECIFIED;
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}
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SRes Lzma2Dec_DecodeToBuf(CLzma2Dec *p, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)
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{
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SizeT outSize = *destLen, inSize = *srcLen;
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*srcLen = *destLen = 0;
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for (;;)
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{
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SizeT inCur = inSize, outCur, dicPos;
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ELzmaFinishMode curFinishMode;
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SRes res;
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if (p->decoder.dicPos == p->decoder.dicBufSize)
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p->decoder.dicPos = 0;
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dicPos = p->decoder.dicPos;
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curFinishMode = LZMA_FINISH_ANY;
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outCur = p->decoder.dicBufSize - dicPos;
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if (outCur >= outSize)
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{
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outCur = outSize;
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curFinishMode = finishMode;
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}
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res = Lzma2Dec_DecodeToDic(p, dicPos + outCur, src, &inCur, curFinishMode, status);
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src += inCur;
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inSize -= inCur;
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*srcLen += inCur;
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outCur = p->decoder.dicPos - dicPos;
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memcpy(dest, p->decoder.dic + dicPos, outCur);
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dest += outCur;
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outSize -= outCur;
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*destLen += outCur;
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if (res != 0)
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return res;
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if (outCur == 0 || outSize == 0)
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return SZ_OK;
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}
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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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{
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CLzma2Dec p;
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SRes res;
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SizeT outSize = *destLen, inSize = *srcLen;
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*destLen = *srcLen = 0;
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*status = LZMA_STATUS_NOT_SPECIFIED;
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Lzma2Dec_Construct(&p);
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RINOK(Lzma2Dec_AllocateProbs(&p, prop, alloc));
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p.decoder.dic = dest;
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p.decoder.dicBufSize = outSize;
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Lzma2Dec_Init(&p);
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*srcLen = inSize;
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res = Lzma2Dec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);
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*destLen = p.decoder.dicPos;
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if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)
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res = SZ_ERROR_INPUT_EOF;
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Lzma2Dec_FreeProbs(&p, alloc);
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return res;
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}
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