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https://github.com/ZDoom/gzdoom.git
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378 lines
10 KiB
C
378 lines
10 KiB
C
/* Lzma2Dec.c -- LZMA2 Decoder
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2015-11-09 : 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 - EOS
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00000001 U U - Uncompressed Reset Dic
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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 + new prop
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111uuuuu U U P P S - LZMA reset state + 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_LZMA (1 << 7)
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#define LZMA2_CONTROL_COPY_NO_RESET 2
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#define LZMA2_CONTROL_COPY_RESET_DIC 1
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#define LZMA2_CONTROL_EOF 0
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#define LZMA2_IS_UNCOMPRESSED_STATE(p) (((p)->control & LZMA2_CONTROL_LZMA) == 0)
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#define LZMA2_GET_LZMA_MODE(p) (((p)->control >> 5) & 3)
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#define LZMA2_IS_THERE_PROP(mode) ((mode) >= 2)
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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, ISzAlloc *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, ISzAlloc *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->needInitDic = True;
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p->needInitState = True;
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p->needInitProp = True;
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LzmaDec_Init(&p->decoder);
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}
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static ELzma2State 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->control = b;
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PRF(printf("\n %4X ", (unsigned)p->decoder.dicPos));
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PRF(printf(" %2X", (unsigned)b));
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if (p->control == 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 ((p->control & 0x7F) > 2)
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return LZMA2_STATE_ERROR;
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p->unpackSize = 0;
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}
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else
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p->unpackSize = (UInt32)(p->control & 0x1F) << 16;
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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(" %8u", (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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PRF(printf(" %8u", (unsigned)p->packSize));
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return LZMA2_IS_THERE_PROP(LZMA2_GET_LZMA_MODE(p)) ? LZMA2_STATE_PROP:
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(p->needInitProp ? LZMA2_STATE_ERROR : 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 = 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 = lc;
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p->decoder.prop.lp = lp;
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p->needInitProp = False;
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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, Bool initDic, Bool 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_FINISHED)
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{
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SizeT dicPos = p->decoder.dicPos;
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if (p->state == LZMA2_STATE_ERROR)
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return SZ_ERROR_DATA;
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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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{
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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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continue;
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}
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{
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SizeT destSizeCur = dicLimit - dicPos;
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SizeT srcSizeCur = inSize - *srcLen;
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ELzmaFinishMode curFinishMode = LZMA_FINISH_ANY;
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if (p->unpackSize <= destSizeCur)
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{
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destSizeCur = (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 (*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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if (p->state == LZMA2_STATE_DATA)
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{
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Bool initDic = (p->control == LZMA2_CONTROL_COPY_RESET_DIC);
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if (initDic)
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p->needInitProp = p->needInitState = True;
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else if (p->needInitDic)
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{
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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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p->needInitDic = False;
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LzmaDec_InitDicAndState(&p->decoder, initDic, False);
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}
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if (srcSizeCur > destSizeCur)
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srcSizeCur = destSizeCur;
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if (srcSizeCur == 0)
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{
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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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LzmaDec_UpdateWithUncompressed(&p->decoder, src, srcSizeCur);
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src += srcSizeCur;
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*srcLen += srcSizeCur;
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p->unpackSize -= (UInt32)srcSizeCur;
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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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SizeT outSizeProcessed;
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SRes res;
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if (p->state == LZMA2_STATE_DATA)
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{
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unsigned mode = LZMA2_GET_LZMA_MODE(p);
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Bool initDic = (mode == 3);
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Bool initState = (mode != 0);
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if ((!initDic && p->needInitDic) || (!initState && p->needInitState))
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{
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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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LzmaDec_InitDicAndState(&p->decoder, initDic, initState);
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p->needInitDic = False;
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p->needInitState = False;
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p->state = LZMA2_STATE_DATA_CONT;
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}
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if (srcSizeCur > p->packSize)
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srcSizeCur = (SizeT)p->packSize;
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res = LzmaDec_DecodeToDic(&p->decoder, dicPos + destSizeCur, src, &srcSizeCur, curFinishMode, status);
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src += srcSizeCur;
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*srcLen += srcSizeCur;
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p->packSize -= (UInt32)srcSizeCur;
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outSizeProcessed = p->decoder.dicPos - dicPos;
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p->unpackSize -= (UInt32)outSizeProcessed;
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RINOK(res);
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if (*status == LZMA_STATUS_NEEDS_MORE_INPUT)
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return res;
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if (srcSizeCur == 0 && outSizeProcessed == 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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{
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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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p->state = LZMA2_STATE_CONTROL;
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}
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if (*status == LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK)
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*status = LZMA_STATUS_NOT_FINISHED;
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}
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}
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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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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 srcSizeCur = inSize, outSizeCur, 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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if (outSize > p->decoder.dicBufSize - dicPos)
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{
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outSizeCur = p->decoder.dicBufSize;
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curFinishMode = LZMA_FINISH_ANY;
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}
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else
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{
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outSizeCur = dicPos + outSize;
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curFinishMode = finishMode;
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}
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res = Lzma2Dec_DecodeToDic(p, outSizeCur, src, &srcSizeCur, curFinishMode, status);
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src += srcSizeCur;
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inSize -= srcSizeCur;
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*srcLen += srcSizeCur;
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outSizeCur = p->decoder.dicPos - dicPos;
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memcpy(dest, p->decoder.dic + dicPos, outSizeCur);
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dest += outSizeCur;
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outSize -= outSizeCur;
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*destLen += outSizeCur;
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if (res != 0)
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return res;
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if (outSizeCur == 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, ISzAlloc *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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