/src/lzma-fuzz/sdk/C/Lzma2Dec.c

Source (jump to first uncovered line)
/* Lzma2Dec.c -- LZMA2 Decoder
2019-02-02 : Igor Pavlov : Public domain */

/* #define SHOW_DEBUG_INFO */

#include "Precomp.h"

#ifdef SHOW_DEBUG_INFO
#include <stdio.h>
#endif

#include <string.h>

#include "Lzma2Dec.h"

/*
00000000  -  End of data
00000001 U U  -  Uncompressed, reset dic, need reset state and set new prop
00000010 U U  -  Uncompressed, no reset
100uuuuu U U P P  -  LZMA, no reset
101uuuuu U U P P  -  LZMA, reset state
110uuuuu U U P P S  -  LZMA, reset state + set new prop
111uuuuu U U P P S  -  LZMA, reset state + set new prop, reset dic

  u, U - Unpack Size
  P - Pack Size
  S - Props
*/

#define LZMA2_CONTROL_COPY_RESET_DIC 1

#define LZMA2_IS_UNCOMPRESSED_STATE(p) (((p)->control & (1 << 7)) == 0)

#define LZMA2_LCLP_MAX 4
#define LZMA2_DIC_SIZE_FROM_PROP(p) (((UInt32)2 | ((p) & 1)) << ((p) / 2 + 11))

#ifdef SHOW_DEBUG_INFO
#define PRF(x) x
#else
#define PRF(x)
#endif

typedef enum
{
  LZMA2_STATE_CONTROL,
  LZMA2_STATE_UNPACK0,
  LZMA2_STATE_UNPACK1,
  LZMA2_STATE_PACK0,
  LZMA2_STATE_PACK1,
  LZMA2_STATE_PROP,
  LZMA2_STATE_DATA,
  LZMA2_STATE_DATA_CONT,
  LZMA2_STATE_FINISHED,
  LZMA2_STATE_ERROR
} ELzma2State;

static SRes Lzma2Dec_GetOldProps(Byte prop, Byte *props)
{
  UInt32 dicSize;
  if (prop > 40)
    return SZ_ERROR_UNSUPPORTED;
  dicSize = (prop == 40) ? 0xFFFFFFFF : LZMA2_DIC_SIZE_FROM_PROP(prop);
  props[0] = (Byte)LZMA2_LCLP_MAX;
  props[1] = (Byte)(dicSize);
  props[2] = (Byte)(dicSize >> 8);
  props[3] = (Byte)(dicSize >> 16);
  props[4] = (Byte)(dicSize >> 24);
  return SZ_OK;
}

SRes Lzma2Dec_AllocateProbs(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc)
{
  Byte props[LZMA_PROPS_SIZE];
  RINOK(Lzma2Dec_GetOldProps(prop, props));
  return LzmaDec_AllocateProbs(&p->decoder, props, LZMA_PROPS_SIZE, alloc);
}

SRes Lzma2Dec_Allocate(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc)
{
  Byte props[LZMA_PROPS_SIZE];
  RINOK(Lzma2Dec_GetOldProps(prop, props));
  return LzmaDec_Allocate(&p->decoder, props, LZMA_PROPS_SIZE, alloc);
}

void Lzma2Dec_Init(CLzma2Dec *p)
{
  p->state = LZMA2_STATE_CONTROL;
  p->needInitLevel = 0xE0;
  p->isExtraMode = False;
  p->unpackSize = 0;
  
  // p->decoder.dicPos = 0; // we can use it instead of full init
  LzmaDec_Init(&p->decoder);
}

static ELzma2State Lzma2Dec_UpdateState(CLzma2Dec *p, Byte b)
{
  switch (p->state)
  {
    case LZMA2_STATE_CONTROL:
      p->isExtraMode = False;
      p->control = b;
      PRF(printf("\n %8X", (unsigned)p->decoder.dicPos));
      PRF(printf(" %02X", (unsigned)b));
      if (b == 0)
        return LZMA2_STATE_FINISHED;
      if (LZMA2_IS_UNCOMPRESSED_STATE(p))
      {
        if (b == LZMA2_CONTROL_COPY_RESET_DIC)
          p->needInitLevel = 0xC0;
        else if (b > 2 || p->needInitLevel == 0xE0)
          return LZMA2_STATE_ERROR;
      }
      else
      {
        if (b < p->needInitLevel)
          return LZMA2_STATE_ERROR;
        p->needInitLevel = 0;
        p->unpackSize = (UInt32)(b & 0x1F) << 16;
      }
      return LZMA2_STATE_UNPACK0;
    
    case LZMA2_STATE_UNPACK0:
      p->unpackSize |= (UInt32)b << 8;
      return LZMA2_STATE_UNPACK1;
    
    case LZMA2_STATE_UNPACK1:
      p->unpackSize |= (UInt32)b;
      p->unpackSize++;
      PRF(printf(" %7u", (unsigned)p->unpackSize));
      return LZMA2_IS_UNCOMPRESSED_STATE(p) ? LZMA2_STATE_DATA : LZMA2_STATE_PACK0;
    
    case LZMA2_STATE_PACK0:
      p->packSize = (UInt32)b << 8;
      return LZMA2_STATE_PACK1;

    case LZMA2_STATE_PACK1:
      p->packSize |= (UInt32)b;
      p->packSize++;
      // if (p->packSize < 5) return LZMA2_STATE_ERROR;
      PRF(printf(" %5u", (unsigned)p->packSize));
      return (p->control & 0x40) ? LZMA2_STATE_PROP : LZMA2_STATE_DATA;

    case LZMA2_STATE_PROP:
    {
      unsigned lc, lp;
      if (b >= (9 * 5 * 5))
        return LZMA2_STATE_ERROR;
      lc = b % 9;
      b /= 9;
      p->decoder.prop.pb = (Byte)(b / 5);
      lp = b % 5;
      if (lc + lp > LZMA2_LCLP_MAX)
        return LZMA2_STATE_ERROR;
      p->decoder.prop.lc = (Byte)lc;
      p->decoder.prop.lp = (Byte)lp;
      return LZMA2_STATE_DATA;
    }
  }
  return LZMA2_STATE_ERROR;
}

static void LzmaDec_UpdateWithUncompressed(CLzmaDec *p, const Byte *src, SizeT size)
{
  memcpy(p->dic + p->dicPos, src, size);
  p->dicPos += size;
  if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= size)
    p->checkDicSize = p->prop.dicSize;
  p->processedPos += (UInt32)size;
}

void LzmaDec_InitDicAndState(CLzmaDec *p, BoolInt initDic, BoolInt initState);


SRes Lzma2Dec_DecodeToDic(CLzma2Dec *p, SizeT dicLimit,
    const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)
{
  SizeT inSize = *srcLen;
  *srcLen = 0;
  *status = LZMA_STATUS_NOT_SPECIFIED;

  while (p->state != LZMA2_STATE_ERROR)
  {
    SizeT dicPos;

    if (p->state == LZMA2_STATE_FINISHED)
    {
      *status = LZMA_STATUS_FINISHED_WITH_MARK;
      return SZ_OK;
    }
    
    dicPos = p->decoder.dicPos;
    
    if (dicPos == dicLimit && finishMode == LZMA_FINISH_ANY)
    {
      *status = LZMA_STATUS_NOT_FINISHED;
      return SZ_OK;
    }

    if (p->state != LZMA2_STATE_DATA && p->state != LZMA2_STATE_DATA_CONT)
    {
      if (*srcLen == inSize)
      {
        *status = LZMA_STATUS_NEEDS_MORE_INPUT;
        return SZ_OK;
      }
      (*srcLen)++;
      p->state = Lzma2Dec_UpdateState(p, *src++);
      if (dicPos == dicLimit && p->state != LZMA2_STATE_FINISHED)
        break;
      continue;
    }
    
    {
      SizeT inCur = inSize - *srcLen;
      SizeT outCur = dicLimit - dicPos;
      ELzmaFinishMode curFinishMode = LZMA_FINISH_ANY;
      
      if (outCur >= p->unpackSize)
      {
        outCur = (SizeT)p->unpackSize;
        curFinishMode = LZMA_FINISH_END;
      }

      if (LZMA2_IS_UNCOMPRESSED_STATE(p))
      {
        if (inCur == 0)
        {
          *status = LZMA_STATUS_NEEDS_MORE_INPUT;
          return SZ_OK;
        }

        if (p->state == LZMA2_STATE_DATA)
        {
          BoolInt initDic = (p->control == LZMA2_CONTROL_COPY_RESET_DIC);
          LzmaDec_InitDicAndState(&p->decoder, initDic, False);
        }

        if (inCur > outCur)
          inCur = outCur;
        if (inCur == 0)
          break;

        LzmaDec_UpdateWithUncompressed(&p->decoder, src, inCur);

        src += inCur;
        *srcLen += inCur;
        p->unpackSize -= (UInt32)inCur;
        p->state = (p->unpackSize == 0) ? LZMA2_STATE_CONTROL : LZMA2_STATE_DATA_CONT;
      }
      else
      {
        SRes res;

        if (p->state == LZMA2_STATE_DATA)
        {
          BoolInt initDic = (p->control >= 0xE0);
          BoolInt initState = (p->control >= 0xA0);
          LzmaDec_InitDicAndState(&p->decoder, initDic, initState);
          p->state = LZMA2_STATE_DATA_CONT;
        }
  
        if (inCur > p->packSize)
          inCur = (SizeT)p->packSize;
        
        res = LzmaDec_DecodeToDic(&p->decoder, dicPos + outCur, src, &inCur, curFinishMode, status);

        src += inCur;
        *srcLen += inCur;
        p->packSize -= (UInt32)inCur;
        outCur = p->decoder.dicPos - dicPos;
        p->unpackSize -= (UInt32)outCur;

        if (res != 0)
          break;
        
        if (*status == LZMA_STATUS_NEEDS_MORE_INPUT)
        {
          if (p->packSize == 0)
            break;
          return SZ_OK;
        }

        if (inCur == 0 && outCur == 0)
        {
          if (*status != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
              || p->unpackSize != 0
              || p->packSize != 0)
            break;
          p->state = LZMA2_STATE_CONTROL;
        }
        
        *status = LZMA_STATUS_NOT_SPECIFIED;
      }
    }
  }
  
  *status = LZMA_STATUS_NOT_SPECIFIED;
  p->state = LZMA2_STATE_ERROR;
  return SZ_ERROR_DATA;
}




ELzma2ParseStatus Lzma2Dec_Parse(CLzma2Dec *p,
    SizeT outSize,
    const Byte *src, SizeT *srcLen,
    int checkFinishBlock)
{
  SizeT inSize = *srcLen;
  *srcLen = 0;

  while (p->state != LZMA2_STATE_ERROR)
  {
    if (p->state == LZMA2_STATE_FINISHED)
      return (ELzma2ParseStatus)LZMA_STATUS_FINISHED_WITH_MARK;

    if (outSize == 0 && !checkFinishBlock)
      return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
    
    if (p->state != LZMA2_STATE_DATA && p->state != LZMA2_STATE_DATA_CONT)
    {
      if (*srcLen == inSize)
        return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
      (*srcLen)++;

      p->state = Lzma2Dec_UpdateState(p, *src++);

      if (p->state == LZMA2_STATE_UNPACK0)
      {
        // if (p->decoder.dicPos != 0)
        if (p->control == LZMA2_CONTROL_COPY_RESET_DIC || p->control >= 0xE0)
          return LZMA2_PARSE_STATUS_NEW_BLOCK;
        // if (outSize == 0) return LZMA_STATUS_NOT_FINISHED;
      }

      // The following code can be commented.
      // It's not big problem, if we read additional input bytes.
      // It will be stopped later in LZMA2_STATE_DATA / LZMA2_STATE_DATA_CONT state.

      if (outSize == 0 && p->state != LZMA2_STATE_FINISHED)
      {
        // checkFinishBlock is true. So we expect that block must be finished,
        // We can return LZMA_STATUS_NOT_SPECIFIED or LZMA_STATUS_NOT_FINISHED here
        // break;
        return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
      }

      if (p->state == LZMA2_STATE_DATA)
        return LZMA2_PARSE_STATUS_NEW_CHUNK;

      continue;
    }

    if (outSize == 0)
      return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;

    {
      SizeT inCur = inSize - *srcLen;

      if (LZMA2_IS_UNCOMPRESSED_STATE(p))
      {
        if (inCur == 0)
          return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
        if (inCur > p->unpackSize)
          inCur = p->unpackSize;
        if (inCur > outSize)
          inCur = outSize;
        p->decoder.dicPos += inCur;
        src += inCur;
        *srcLen += inCur;
        outSize -= inCur;
        p->unpackSize -= (UInt32)inCur;
        p->state = (p->unpackSize == 0) ? LZMA2_STATE_CONTROL : LZMA2_STATE_DATA_CONT;
      }
      else
      {
        p->isExtraMode = True;

        if (inCur == 0)
        {
          if (p->packSize != 0)
            return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
        }
        else if (p->state == LZMA2_STATE_DATA)
        {
          p->state = LZMA2_STATE_DATA_CONT;
          if (*src != 0)
          {
            // first byte of lzma chunk must be Zero
            *srcLen += 1;
            p->packSize--;
            break;
          }
        }
  
        if (inCur > p->packSize)
          inCur = (SizeT)p->packSize;

        src += inCur;
        *srcLen += inCur;
        p->packSize -= (UInt32)inCur;

        if (p->packSize == 0)
        {
          SizeT rem = outSize;
          if (rem > p->unpackSize)
            rem = p->unpackSize;
          p->decoder.dicPos += rem;
          p->unpackSize -= (UInt32)rem;
          outSize -= rem;
          if (p->unpackSize == 0)
            p->state = LZMA2_STATE_CONTROL;
        }
      }
    }
  }
  
  p->state = LZMA2_STATE_ERROR;
  return (ELzma2ParseStatus)LZMA_STATUS_NOT_SPECIFIED;
}




SRes Lzma2Dec_DecodeToBuf(CLzma2Dec *p, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)
{
  SizeT outSize = *destLen, inSize = *srcLen;
  *srcLen = *destLen = 0;
  
  for (;;)
  {
    SizeT inCur = inSize, outCur, dicPos;
    ELzmaFinishMode curFinishMode;
    SRes res;
    
    if (p->decoder.dicPos == p->decoder.dicBufSize)
      p->decoder.dicPos = 0;
    dicPos = p->decoder.dicPos;
    curFinishMode = LZMA_FINISH_ANY;
    outCur = p->decoder.dicBufSize - dicPos;
    
    if (outCur >= outSize)
    {
      outCur = outSize;
      curFinishMode = finishMode;
    }

    res = Lzma2Dec_DecodeToDic(p, dicPos + outCur, src, &inCur, curFinishMode, status);
    
    src += inCur;
    inSize -= inCur;
    *srcLen += inCur;
    outCur = p->decoder.dicPos - dicPos;
    memcpy(dest, p->decoder.dic + dicPos, outCur);
    dest += outCur;
    outSize -= outCur;
    *destLen += outCur;
    if (res != 0)
      return res;
    if (outCur == 0 || outSize == 0)
      return SZ_OK;
  }
}


SRes Lzma2Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
    Byte prop, ELzmaFinishMode finishMode, ELzmaStatus *status, ISzAllocPtr alloc)
{
  CLzma2Dec p;
  SRes res;
  SizeT outSize = *destLen, inSize = *srcLen;
  *destLen = *srcLen = 0;
  *status = LZMA_STATUS_NOT_SPECIFIED;
  Lzma2Dec_Construct(&p);
  RINOK(Lzma2Dec_AllocateProbs(&p, prop, alloc));
  p.decoder.dic = dest;
  p.decoder.dicBufSize = outSize;
  Lzma2Dec_Init(&p);
  *srcLen = inSize;
  res = Lzma2Dec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);
  *destLen = p.decoder.dicPos;
  if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)
    res = SZ_ERROR_INPUT_EOF;
  Lzma2Dec_FreeProbs(&p, alloc);
  return res;
}

Coverage Report

Created: 2025-08-11 06:34

Line	Count	Source (jump to first uncovered line)
1		/* Lzma2Dec.c -- LZMA2 Decoder
2		2019-02-02 : Igor Pavlov : Public domain */
3
4		/* #define SHOW_DEBUG_INFO */
5
6		#include "Precomp.h"
7
8		#ifdef SHOW_DEBUG_INFO
9		#include <stdio.h>
10		#endif
11
12		#include <string.h>
13
14		#include "Lzma2Dec.h"
15
16		/*
17		00000000 - End of data
18		00000001 U U - Uncompressed, reset dic, need reset state and set new prop
19		00000010 U U - Uncompressed, no reset
20		100uuuuu U U P P - LZMA, no reset
21		101uuuuu U U P P - LZMA, reset state
22		110uuuuu U U P P S - LZMA, reset state + set new prop
23		111uuuuu U U P P S - LZMA, reset state + set new prop, reset dic
24
25		u, U - Unpack Size
26		P - Pack Size
27		S - Props
28		*/
29
30	178k	#define LZMA2_CONTROL_COPY_RESET_DIC 1
31
32	1.07M	#define LZMA2_IS_UNCOMPRESSED_STATE(p) (((p)->control & (1 << 7)) == 0)
33
34	247k	#define LZMA2_LCLP_MAX 4
35	144k	#define LZMA2_DIC_SIZE_FROM_PROP(p) (((UInt32)2 \| ((p) & 1)) << ((p) / 2 + 11))
36
37		#ifdef SHOW_DEBUG_INFO
38		#define PRF(x) x
39		#else
40		#define PRF(x)
41		#endif
42
43		typedef enum
44		{
45		LZMA2_STATE_CONTROL,
46		LZMA2_STATE_UNPACK0,
47		LZMA2_STATE_UNPACK1,
48		LZMA2_STATE_PACK0,
49		LZMA2_STATE_PACK1,
50		LZMA2_STATE_PROP,
51		LZMA2_STATE_DATA,
52		LZMA2_STATE_DATA_CONT,
53		LZMA2_STATE_FINISHED,
54		LZMA2_STATE_ERROR
55		} ELzma2State;
56
57		static SRes Lzma2Dec_GetOldProps(Byte prop, Byte *props)
58	72.3k	{
59	72.3k	UInt32 dicSize;
60	72.3k	if (prop > 40)
61	0	return SZ_ERROR_UNSUPPORTED;
62	72.3k	dicSize = (prop == 40) ? 0xFFFFFFFF : LZMA2_DIC_SIZE_FROM_PROP(prop);
63	72.3k	props[0] = (Byte)LZMA2_LCLP_MAX;
64	72.3k	props[1] = (Byte)(dicSize);
65	72.3k	props[2] = (Byte)(dicSize >> 8);
66	72.3k	props[3] = (Byte)(dicSize >> 16);
67	72.3k	props[4] = (Byte)(dicSize >> 24);
68	72.3k	return SZ_OK;
69	72.3k	}
70
71		SRes Lzma2Dec_AllocateProbs(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc)
72	8.22k	{
73	8.22k	Byte props[LZMA_PROPS_SIZE];
74	8.22k	RINOK(Lzma2Dec_GetOldProps(prop, props));
75	8.22k	return LzmaDec_AllocateProbs(&p->decoder, props, LZMA_PROPS_SIZE, alloc);
76	8.22k	}
77
78		SRes Lzma2Dec_Allocate(CLzma2Dec *p, Byte prop, ISzAllocPtr alloc)
79	64.0k	{
80	64.0k	Byte props[LZMA_PROPS_SIZE];
81	64.0k	RINOK(Lzma2Dec_GetOldProps(prop, props));
82	64.0k	return LzmaDec_Allocate(&p->decoder, props, LZMA_PROPS_SIZE, alloc);
83	64.0k	}
84
85		void Lzma2Dec_Init(CLzma2Dec *p)
86	72.3k	{
87	72.3k	p->state = LZMA2_STATE_CONTROL;
88	72.3k	p->needInitLevel = 0xE0;
89	72.3k	p->isExtraMode = False;
90	72.3k	p->unpackSize = 0;
91
92		// p->decoder.dicPos = 0; // we can use it instead of full init
93	72.3k	LzmaDec_Init(&p->decoder);
94	72.3k	}
95
96		static ELzma2State Lzma2Dec_UpdateState(CLzma2Dec *p, Byte b)
97	1.42M	{
98	1.42M	switch (p->state)
99	1.42M	{
100	334k	case LZMA2_STATE_CONTROL:
101	334k	p->isExtraMode = False;
102	334k	p->control = b;
103	334k	PRF(printf("\n %8X", (unsigned)p->decoder.dicPos));
104	334k	PRF(printf(" %02X", (unsigned)b));
105	334k	if (b == 0)
106	61.1k	return LZMA2_STATE_FINISHED;
107	272k	if (LZMA2_IS_UNCOMPRESSED_STATE(p))
108	89.4k	{
109	89.4k	if (b == LZMA2_CONTROL_COPY_RESET_DIC)
110	9.74k	p->needInitLevel = 0xC0;
111	79.7k	else if (b > 2 \|\| p->needInitLevel == 0xE0)
112	70	return LZMA2_STATE_ERROR;
113	89.4k	}
114	183k	else
115	183k	{
116	183k	if (b < p->needInitLevel)
117	31	return LZMA2_STATE_ERROR;
118	183k	p->needInitLevel = 0;
119	183k	p->unpackSize = (UInt32)(b & 0x1F) << 16;
120	183k	}
121	272k	return LZMA2_STATE_UNPACK0;
122
123	272k	case LZMA2_STATE_UNPACK0:
124	272k	p->unpackSize \|= (UInt32)b << 8;
125	272k	return LZMA2_STATE_UNPACK1;
126
127	272k	case LZMA2_STATE_UNPACK1:
128	272k	p->unpackSize \|= (UInt32)b;
129	272k	p->unpackSize++;
130	272k	PRF(printf(" %7u", (unsigned)p->unpackSize));
131	272k	return LZMA2_IS_UNCOMPRESSED_STATE(p) ? LZMA2_STATE_DATA : LZMA2_STATE_PACK0;
132
133	183k	case LZMA2_STATE_PACK0:
134	183k	p->packSize = (UInt32)b << 8;
135	183k	return LZMA2_STATE_PACK1;
136
137	183k	case LZMA2_STATE_PACK1:
138	183k	p->packSize \|= (UInt32)b;
139	183k	p->packSize++;
140		// if (p->packSize < 5) return LZMA2_STATE_ERROR;
141	183k	PRF(printf(" %5u", (unsigned)p->packSize));
142	183k	return (p->control & 0x40) ? LZMA2_STATE_PROP : LZMA2_STATE_DATA;
143
144	174k	case LZMA2_STATE_PROP:
145	174k	{
146	174k	unsigned lc, lp;
147	174k	if (b >= (9 * 5 * 5))
148	8	return LZMA2_STATE_ERROR;
149	174k	lc = b % 9;
150	174k	b /= 9;
151	174k	p->decoder.prop.pb = (Byte)(b / 5);
152	174k	lp = b % 5;
153	174k	if (lc + lp > LZMA2_LCLP_MAX)
154	17	return LZMA2_STATE_ERROR;
155	174k	p->decoder.prop.lc = (Byte)lc;
156	174k	p->decoder.prop.lp = (Byte)lp;
157	174k	return LZMA2_STATE_DATA;
158	174k	}
159	1.42M	}
160	0	return LZMA2_STATE_ERROR;
161	1.42M	}
162
163		static void LzmaDec_UpdateWithUncompressed(CLzmaDec p, const Byte src, SizeT size)
164	91.3k	{
165	91.3k	memcpy(p->dic + p->dicPos, src, size);
166	91.3k	p->dicPos += size;
167	91.3k	if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= size)
168	503	p->checkDicSize = p->prop.dicSize;
169	91.3k	p->processedPos += (UInt32)size;
170	91.3k	}
171
172		void LzmaDec_InitDicAndState(CLzmaDec *p, BoolInt initDic, BoolInt initState);
173
174
175		SRes Lzma2Dec_DecodeToDic(CLzma2Dec *p, SizeT dicLimit,
176		const Byte src, SizeT srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)
177	250k	{
178	250k	SizeT inSize = *srcLen;
179	250k	*srcLen = 0;
180	250k	*status = LZMA_STATUS_NOT_SPECIFIED;
181
182	2.17M	while (p->state != LZMA2_STATE_ERROR)
183	2.17M	{
184	2.17M	SizeT dicPos;
185
186	2.17M	if (p->state == LZMA2_STATE_FINISHED)
187	157k	{
188	157k	*status = LZMA_STATUS_FINISHED_WITH_MARK;
189	157k	return SZ_OK;
190	157k	}
191
192	2.01M	dicPos = p->decoder.dicPos;
193
194	2.01M	if (dicPos == dicLimit && finishMode == LZMA_FINISH_ANY)
195	64.4k	{
196	64.4k	*status = LZMA_STATUS_NOT_FINISHED;
197	64.4k	return SZ_OK;
198	64.4k	}
199
200	1.94M	if (p->state != LZMA2_STATE_DATA && p->state != LZMA2_STATE_DATA_CONT)
201	1.42M	{
202	1.42M	if (*srcLen == inSize)
203	1.02k	{
204	1.02k	*status = LZMA_STATUS_NEEDS_MORE_INPUT;
205	1.02k	return SZ_OK;
206	1.02k	}
207	1.42M	(*srcLen)++;
208	1.42M	p->state = Lzma2Dec_UpdateState(p, *src++);
209	1.42M	if (dicPos == dicLimit && p->state != LZMA2_STATE_FINISHED)
210	6	break;
211	1.42M	continue;
212	1.42M	}
213
214	527k	{
215	527k	SizeT inCur = inSize - *srcLen;
216	527k	SizeT outCur = dicLimit - dicPos;
217	527k	ELzmaFinishMode curFinishMode = LZMA_FINISH_ANY;
218
219	527k	if (outCur >= p->unpackSize)
220	442k	{
221	442k	outCur = (SizeT)p->unpackSize;
222	442k	curFinishMode = LZMA_FINISH_END;
223	442k	}
224
225	527k	if (LZMA2_IS_UNCOMPRESSED_STATE(p))
226	94.1k	{
227	94.1k	if (inCur == 0)
228	2.74k	{
229	2.74k	*status = LZMA_STATUS_NEEDS_MORE_INPUT;
230	2.74k	return SZ_OK;
231	2.74k	}
232
233	91.3k	if (p->state == LZMA2_STATE_DATA)
234	89.2k	{
235	89.2k	BoolInt initDic = (p->control == LZMA2_CONTROL_COPY_RESET_DIC);
236	89.2k	LzmaDec_InitDicAndState(&p->decoder, initDic, False);
237	89.2k	}
238
239	91.3k	if (inCur > outCur)
240	90.5k	inCur = outCur;
241	91.3k	if (inCur == 0)
242	4	break;
243
244	91.3k	LzmaDec_UpdateWithUncompressed(&p->decoder, src, inCur);
245
246	91.3k	src += inCur;
247	91.3k	*srcLen += inCur;
248	91.3k	p->unpackSize -= (UInt32)inCur;
249	91.3k	p->state = (p->unpackSize == 0) ? LZMA2_STATE_CONTROL : LZMA2_STATE_DATA_CONT;
250	91.3k	}
251	433k	else
252	433k	{
253	433k	SRes res;
254
255	433k	if (p->state == LZMA2_STATE_DATA)
256	183k	{
257	183k	BoolInt initDic = (p->control >= 0xE0);
258	183k	BoolInt initState = (p->control >= 0xA0);
259	183k	LzmaDec_InitDicAndState(&p->decoder, initDic, initState);
260	183k	p->state = LZMA2_STATE_DATA_CONT;
261	183k	}
262
263	433k	if (inCur > p->packSize)
264	383k	inCur = (SizeT)p->packSize;
265
266	433k	res = LzmaDec_DecodeToDic(&p->decoder, dicPos + outCur, src, &inCur, curFinishMode, status);
267
268	433k	src += inCur;
269	433k	*srcLen += inCur;
270	433k	p->packSize -= (UInt32)inCur;
271	433k	outCur = p->decoder.dicPos - dicPos;
272	433k	p->unpackSize -= (UInt32)outCur;
273
274	433k	if (res != 0)
275	2.09k	break;
276
277	431k	if (*status == LZMA_STATUS_NEEDS_MORE_INPUT)
278	22.9k	{
279	22.9k	if (p->packSize == 0)
280	212	break;
281	22.7k	return SZ_OK;
282	22.9k	}
283
284	408k	if (inCur == 0 && outCur == 0)
285	173k	{
286	173k	if (*status != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
287	173k	\|\| p->unpackSize != 0
288	173k	\|\| p->packSize != 0)
289	185	break;
290	173k	p->state = LZMA2_STATE_CONTROL;
291	173k	}
292
293	408k	*status = LZMA_STATUS_NOT_SPECIFIED;
294	408k	}
295	527k	}
296	527k	}
297
298	2.62k	*status = LZMA_STATUS_NOT_SPECIFIED;
299	2.62k	p->state = LZMA2_STATE_ERROR;
300	2.62k	return SZ_ERROR_DATA;
301	250k	}
302
303
304
305
306		ELzma2ParseStatus Lzma2Dec_Parse(CLzma2Dec *p,
307		SizeT outSize,
308		const Byte src, SizeT srcLen,
309		int checkFinishBlock)
310	0	{
311	0	SizeT inSize = *srcLen;
312	0	*srcLen = 0;
313
314	0	while (p->state != LZMA2_STATE_ERROR)
315	0	{
316	0	if (p->state == LZMA2_STATE_FINISHED)
317	0	return (ELzma2ParseStatus)LZMA_STATUS_FINISHED_WITH_MARK;
318
319	0	if (outSize == 0 && !checkFinishBlock)
320	0	return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
321
322	0	if (p->state != LZMA2_STATE_DATA && p->state != LZMA2_STATE_DATA_CONT)
323	0	{
324	0	if (*srcLen == inSize)
325	0	return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
326	0	(*srcLen)++;
327
328	0	p->state = Lzma2Dec_UpdateState(p, *src++);
329
330	0	if (p->state == LZMA2_STATE_UNPACK0)
331	0	{
332		// if (p->decoder.dicPos != 0)
333	0	if (p->control == LZMA2_CONTROL_COPY_RESET_DIC \|\| p->control >= 0xE0)
334	0	return LZMA2_PARSE_STATUS_NEW_BLOCK;
335		// if (outSize == 0) return LZMA_STATUS_NOT_FINISHED;
336	0	}
337
338		// The following code can be commented.
339		// It's not big problem, if we read additional input bytes.
340		// It will be stopped later in LZMA2_STATE_DATA / LZMA2_STATE_DATA_CONT state.
341
342	0	if (outSize == 0 && p->state != LZMA2_STATE_FINISHED)
343	0	{
344		// checkFinishBlock is true. So we expect that block must be finished,
345		// We can return LZMA_STATUS_NOT_SPECIFIED or LZMA_STATUS_NOT_FINISHED here
346		// break;
347	0	return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
348	0	}
349
350	0	if (p->state == LZMA2_STATE_DATA)
351	0	return LZMA2_PARSE_STATUS_NEW_CHUNK;
352
353	0	continue;
354	0	}
355
356	0	if (outSize == 0)
357	0	return (ELzma2ParseStatus)LZMA_STATUS_NOT_FINISHED;
358
359	0	{
360	0	SizeT inCur = inSize - *srcLen;
361
362	0	if (LZMA2_IS_UNCOMPRESSED_STATE(p))
363	0	{
364	0	if (inCur == 0)
365	0	return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
366	0	if (inCur > p->unpackSize)
367	0	inCur = p->unpackSize;
368	0	if (inCur > outSize)
369	0	inCur = outSize;
370	0	p->decoder.dicPos += inCur;
371	0	src += inCur;
372	0	*srcLen += inCur;
373	0	outSize -= inCur;
374	0	p->unpackSize -= (UInt32)inCur;
375	0	p->state = (p->unpackSize == 0) ? LZMA2_STATE_CONTROL : LZMA2_STATE_DATA_CONT;
376	0	}
377	0	else
378	0	{
379	0	p->isExtraMode = True;
380
381	0	if (inCur == 0)
382	0	{
383	0	if (p->packSize != 0)
384	0	return (ELzma2ParseStatus)LZMA_STATUS_NEEDS_MORE_INPUT;
385	0	}
386	0	else if (p->state == LZMA2_STATE_DATA)
387	0	{
388	0	p->state = LZMA2_STATE_DATA_CONT;
389	0	if (*src != 0)
390	0	{
391		// first byte of lzma chunk must be Zero
392	0	*srcLen += 1;
393	0	p->packSize--;
394	0	break;
395	0	}
396	0	}
397
398	0	if (inCur > p->packSize)
399	0	inCur = (SizeT)p->packSize;
400
401	0	src += inCur;
402	0	*srcLen += inCur;
403	0	p->packSize -= (UInt32)inCur;
404
405	0	if (p->packSize == 0)
406	0	{
407	0	SizeT rem = outSize;
408	0	if (rem > p->unpackSize)
409	0	rem = p->unpackSize;
410	0	p->decoder.dicPos += rem;
411	0	p->unpackSize -= (UInt32)rem;
412	0	outSize -= rem;
413	0	if (p->unpackSize == 0)
414	0	p->state = LZMA2_STATE_CONTROL;
415	0	}
416	0	}
417	0	}
418	0	}
419
420	0	p->state = LZMA2_STATE_ERROR;
421	0	return (ELzma2ParseStatus)LZMA_STATUS_NOT_SPECIFIED;
422	0	}
423
424
425
426
427		SRes Lzma2Dec_DecodeToBuf(CLzma2Dec p, Byte dest, SizeT destLen, const Byte src, SizeT srcLen, ELzmaFinishMode finishMode, ELzmaStatus status)
428	144k	{
429	144k	SizeT outSize = destLen, inSize = srcLen;
430	144k	srcLen = destLen = 0;
431
432	144k	for (;;)
433	242k	{
434	242k	SizeT inCur = inSize, outCur, dicPos;
435	242k	ELzmaFinishMode curFinishMode;
436	242k	SRes res;
437
438	242k	if (p->decoder.dicPos == p->decoder.dicBufSize)
439	50.5k	p->decoder.dicPos = 0;
440	242k	dicPos = p->decoder.dicPos;
441	242k	curFinishMode = LZMA_FINISH_ANY;
442	242k	outCur = p->decoder.dicBufSize - dicPos;
443
444	242k	if (outCur >= outSize)
445	65.1k	{
446	65.1k	outCur = outSize;
447	65.1k	curFinishMode = finishMode;
448	65.1k	}
449
450	242k	res = Lzma2Dec_DecodeToDic(p, dicPos + outCur, src, &inCur, curFinishMode, status);
451
452	242k	src += inCur;
453	242k	inSize -= inCur;
454	242k	*srcLen += inCur;
455	242k	outCur = p->decoder.dicPos - dicPos;
456	242k	memcpy(dest, p->decoder.dic + dicPos, outCur);
457	242k	dest += outCur;
458	242k	outSize -= outCur;
459	242k	*destLen += outCur;
460	242k	if (res != 0)
461	2.44k	return res;
462	239k	if (outCur == 0 \|\| outSize == 0)
463	142k	return SZ_OK;
464	239k	}
465	144k	}
466
467
468		SRes Lzma2Decode(Byte dest, SizeT destLen, const Byte src, SizeT srcLen,
469		Byte prop, ELzmaFinishMode finishMode, ELzmaStatus *status, ISzAllocPtr alloc)
470	7.77k	{
471	7.77k	CLzma2Dec p;
472	7.77k	SRes res;
473	7.77k	SizeT outSize = destLen, inSize = srcLen;
474	7.77k	destLen = srcLen = 0;
475	7.77k	*status = LZMA_STATUS_NOT_SPECIFIED;
476	7.77k	Lzma2Dec_Construct(&p);
477	7.77k	RINOK(Lzma2Dec_AllocateProbs(&p, prop, alloc));
478	7.77k	p.decoder.dic = dest;
479	7.77k	p.decoder.dicBufSize = outSize;
480	7.77k	Lzma2Dec_Init(&p);
481	7.77k	*srcLen = inSize;
482	7.77k	res = Lzma2Dec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);
483	7.77k	*destLen = p.decoder.dicPos;
484	7.77k	if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)
485	0	res = SZ_ERROR_INPUT_EOF;
486	7.77k	Lzma2Dec_FreeProbs(&p, alloc);
487	7.77k	return res;
488	7.77k	}