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2eb60a059819da595efb8e1de49f04c241f5b981
easy7zip/CPP/7zip/Compress/BZip2Decoder.cpp
Igor Pavlov 2eb60a0598 9.17
2016-05-28 00:16:04 +01:00

944 lines
22 KiB
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// BZip2Decoder.cpp
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "BZip2Decoder.h"
#include "Mtf8.h"
namespace NCompress {
namespace NBZip2 {
#undef NO_INLINE
#define NO_INLINE
static const UInt32 kNumThreadsMax = 4;
static const UInt32 kBufferSize = (1 << 17);
static const UInt16 kRandNums[512] = {
619, 720, 127, 481, 931, 816, 813, 233, 566, 247,
985, 724, 205, 454, 863, 491, 741, 242, 949, 214,
733, 859, 335, 708, 621, 574, 73, 654, 730, 472,
419, 436, 278, 496, 867, 210, 399, 680, 480, 51,
878, 465, 811, 169, 869, 675, 611, 697, 867, 561,
862, 687, 507, 283, 482, 129, 807, 591, 733, 623,
150, 238, 59, 379, 684, 877, 625, 169, 643, 105,
170, 607, 520, 932, 727, 476, 693, 425, 174, 647,
73, 122, 335, 530, 442, 853, 695, 249, 445, 515,
909, 545, 703, 919, 874, 474, 882, 500, 594, 612,
641, 801, 220, 162, 819, 984, 589, 513, 495, 799,
161, 604, 958, 533, 221, 400, 386, 867, 600, 782,
382, 596, 414, 171, 516, 375, 682, 485, 911, 276,
98, 553, 163, 354, 666, 933, 424, 341, 533, 870,
227, 730, 475, 186, 263, 647, 537, 686, 600, 224,
469, 68, 770, 919, 190, 373, 294, 822, 808, 206,
184, 943, 795, 384, 383, 461, 404, 758, 839, 887,
715, 67, 618, 276, 204, 918, 873, 777, 604, 560,
951, 160, 578, 722, 79, 804, 96, 409, 713, 940,
652, 934, 970, 447, 318, 353, 859, 672, 112, 785,
645, 863, 803, 350, 139, 93, 354, 99, 820, 908,
609, 772, 154, 274, 580, 184, 79, 626, 630, 742,
653, 282, 762, 623, 680, 81, 927, 626, 789, 125,
411, 521, 938, 300, 821, 78, 343, 175, 128, 250,
170, 774, 972, 275, 999, 639, 495, 78, 352, 126,
857, 956, 358, 619, 580, 124, 737, 594, 701, 612,
669, 112, 134, 694, 363, 992, 809, 743, 168, 974,
944, 375, 748, 52, 600, 747, 642, 182, 862, 81,
344, 805, 988, 739, 511, 655, 814, 334, 249, 515,
897, 955, 664, 981, 649, 113, 974, 459, 893, 228,
433, 837, 553, 268, 926, 240, 102, 654, 459, 51,
686, 754, 806, 760, 493, 403, 415, 394, 687, 700,
946, 670, 656, 610, 738, 392, 760, 799, 887, 653,
978, 321, 576, 617, 626, 502, 894, 679, 243, 440,
680, 879, 194, 572, 640, 724, 926, 56, 204, 700,
707, 151, 457, 449, 797, 195, 791, 558, 945, 679,
297, 59, 87, 824, 713, 663, 412, 693, 342, 606,
134, 108, 571, 364, 631, 212, 174, 643, 304, 329,
343, 97, 430, 751, 497, 314, 983, 374, 822, 928,
140, 206, 73, 263, 980, 736, 876, 478, 430, 305,
170, 514, 364, 692, 829, 82, 855, 953, 676, 246,
369, 970, 294, 750, 807, 827, 150, 790, 288, 923,
804, 378, 215, 828, 592, 281, 565, 555, 710, 82,
896, 831, 547, 261, 524, 462, 293, 465, 502, 56,
661, 821, 976, 991, 658, 869, 905, 758, 745, 193,
768, 550, 608, 933, 378, 286, 215, 979, 792, 961,
61, 688, 793, 644, 986, 403, 106, 366, 905, 644,
372, 567, 466, 434, 645, 210, 389, 550, 919, 135,
780, 773, 635, 389, 707, 100, 626, 958, 165, 504,
920, 176, 193, 713, 857, 265, 203, 50, 668, 108,
645, 990, 626, 197, 510, 357, 358, 850, 858, 364,
936, 638
};
bool CState::Alloc()
{
if (!Counters)
Counters = (UInt32 *)::BigAlloc((256 + kBlockSizeMax) * sizeof(UInt32));
return (Counters != 0);
}
void CState::Free()
{
::BigFree(Counters);
Counters = 0;
}
UInt32 CDecoder::ReadBits(unsigned numBits) { return m_InStream.ReadBits(numBits); }
Byte CDecoder::ReadByte() {return (Byte)ReadBits(8); }
bool CDecoder::ReadBit() { return ReadBits(1) != 0; }
UInt32 CDecoder::ReadCrc()
{
UInt32 crc = 0;
for (int i = 0; i < 4; i++)
{
crc <<= 8;
crc |= ReadByte();
}
return crc;
}
static UInt32 NO_INLINE ReadBits(NBitm::CDecoder<CInBuffer> *m_InStream, unsigned num)
{
return m_InStream->ReadBits(num);
}
static UInt32 NO_INLINE ReadBit(NBitm::CDecoder<CInBuffer> *m_InStream)
{
return m_InStream->ReadBits(1);
}
static HRESULT NO_INLINE ReadBlock(NBitm::CDecoder<CInBuffer> *m_InStream,
UInt32 *CharCounters, UInt32 blockSizeMax, Byte *m_Selectors, CHuffmanDecoder *m_HuffmanDecoders,
UInt32 *blockSizeRes, UInt32 *origPtrRes, bool *randRes)
{
if (randRes)
*randRes = ReadBit(m_InStream) ? true : false;
*origPtrRes = ReadBits(m_InStream, kNumOrigBits);
// in original code it compares OrigPtr to (UInt32)(10 + blockSizeMax)) : why ?
if (*origPtrRes >= blockSizeMax)
return S_FALSE;
CMtf8Decoder mtf;
mtf.StartInit();
int numInUse = 0;
{
Byte inUse16[16];
int i;
for (i = 0; i < 16; i++)
inUse16[i] = (Byte)ReadBit(m_InStream);
for (i = 0; i < 256; i++)
if (inUse16[i >> 4])
{
if (ReadBit(m_InStream))
mtf.Add(numInUse++, (Byte)i);
}
if (numInUse == 0)
return S_FALSE;
// mtf.Init(numInUse);
}
int alphaSize = numInUse + 2;
int numTables = ReadBits(m_InStream, kNumTablesBits);
if (numTables < kNumTablesMin || numTables > kNumTablesMax)
return S_FALSE;
UInt32 numSelectors = ReadBits(m_InStream, kNumSelectorsBits);
if (numSelectors < 1 || numSelectors > kNumSelectorsMax)
return S_FALSE;
{
Byte mtfPos[kNumTablesMax];
int t = 0;
do
mtfPos[t] = (Byte)t;
while(++t < numTables);
UInt32 i = 0;
do
{
int j = 0;
while (ReadBit(m_InStream))
if (++j >= numTables)
return S_FALSE;
Byte tmp = mtfPos[j];
for (;j > 0; j--)
mtfPos[j] = mtfPos[j - 1];
m_Selectors[i] = mtfPos[0] = tmp;
}
while(++i < numSelectors);
}
int t = 0;
do
{
Byte lens[kMaxAlphaSize];
int len = (int)ReadBits(m_InStream, kNumLevelsBits);
int i;
for (i = 0; i < alphaSize; i++)
{
for (;;)
{
if (len < 1 || len > kMaxHuffmanLen)
return S_FALSE;
if (!ReadBit(m_InStream))
break;
len += 1 - (int)(ReadBit(m_InStream) << 1);
}
lens[i] = (Byte)len;
}
for (; i < kMaxAlphaSize; i++)
lens[i] = 0;
if(!m_HuffmanDecoders[t].SetCodeLengths(lens))
return S_FALSE;
}
while(++t < numTables);
{
for (int i = 0; i < 256; i++)
CharCounters[i] = 0;
}
UInt32 blockSize = 0;
{
UInt32 groupIndex = 0;
UInt32 groupSize = 0;
CHuffmanDecoder *huffmanDecoder = 0;
int runPower = 0;
UInt32 runCounter = 0;
for (;;)
{
if (groupSize == 0)
{
if (groupIndex >= numSelectors)
return S_FALSE;
groupSize = kGroupSize;
huffmanDecoder = &m_HuffmanDecoders[m_Selectors[groupIndex++]];
}
groupSize--;
UInt32 nextSym = huffmanDecoder->DecodeSymbol(m_InStream);
if (nextSym < 2)
{
runCounter += ((UInt32)(nextSym + 1) << runPower++);
if (blockSizeMax - blockSize < runCounter)
return S_FALSE;
continue;
}
if (runCounter != 0)
{
UInt32 b = (UInt32)mtf.GetHead();
CharCounters[b] += runCounter;
do
CharCounters[256 + blockSize++] = b;
while(--runCounter != 0);
runPower = 0;
}
if (nextSym <= (UInt32)numInUse)
{
UInt32 b = (UInt32)mtf.GetAndMove((int)nextSym - 1);
if (blockSize >= blockSizeMax)
return S_FALSE;
CharCounters[b]++;
CharCounters[256 + blockSize++] = b;
}
else if (nextSym == (UInt32)numInUse + 1)
break;
else
return S_FALSE;
}
}
*blockSizeRes = blockSize;
return (*origPtrRes < blockSize) ? S_OK : S_FALSE;
}
static void NO_INLINE DecodeBlock1(UInt32 *charCounters, UInt32 blockSize)
{
{
UInt32 sum = 0;
for (UInt32 i = 0; i < 256; i++)
{
sum += charCounters[i];
charCounters[i] = sum - charCounters[i];
}
}
UInt32 *tt = charCounters + 256;
// Compute the T^(-1) vector
UInt32 i = 0;
do
tt[charCounters[tt[i] & 0xFF]++] |= (i << 8);
while(++i < blockSize);
}
static UInt32 NO_INLINE DecodeBlock2(const UInt32 *tt, UInt32 blockSize, UInt32 OrigPtr, COutBuffer &m_OutStream)
{
CBZip2Crc crc;
// it's for speed optimization: prefetch & prevByte_init;
UInt32 tPos = tt[tt[OrigPtr] >> 8];
unsigned prevByte = (unsigned)(tPos & 0xFF);
unsigned numReps = 0;
do
{
unsigned b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
if (numReps == kRleModeRepSize)
{
for (; b > 0; b--)
{
crc.UpdateByte(prevByte);
m_OutStream.WriteByte((Byte)prevByte);
}
numReps = 0;
continue;
}
if (b != prevByte)
numReps = 0;
numReps++;
prevByte = b;
crc.UpdateByte(b);
m_OutStream.WriteByte((Byte)b);
/*
prevByte = b;
crc.UpdateByte(b);
m_OutStream.WriteByte((Byte)b);
for (; --blockSize != 0;)
{
b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
crc.UpdateByte(b);
m_OutStream.WriteByte((Byte)b);
if (b != prevByte)
{
prevByte = b;
continue;
}
if (--blockSize == 0)
break;
b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
crc.UpdateByte(b);
m_OutStream.WriteByte((Byte)b);
if (b != prevByte)
{
prevByte = b;
continue;
}
if (--blockSize == 0)
break;
b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
crc.UpdateByte(b);
m_OutStream.WriteByte((Byte)b);
if (b != prevByte)
{
prevByte = b;
continue;
}
--blockSize;
break;
}
if (blockSize == 0)
break;
b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
for (; b > 0; b--)
{
crc.UpdateByte(prevByte);
m_OutStream.WriteByte((Byte)prevByte);
}
*/
}
while(--blockSize != 0);
return crc.GetDigest();
}
static UInt32 NO_INLINE DecodeBlock2Rand(const UInt32 *tt, UInt32 blockSize, UInt32 OrigPtr, COutBuffer &m_OutStream)
{
CBZip2Crc crc;
UInt32 randIndex = 1;
UInt32 randToGo = kRandNums[0] - 2;
unsigned numReps = 0;
// it's for speed optimization: prefetch & prevByte_init;
UInt32 tPos = tt[tt[OrigPtr] >> 8];
unsigned prevByte = (unsigned)(tPos & 0xFF);
do
{
unsigned b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
{
if (randToGo == 0)
{
b ^= 1;
randToGo = kRandNums[randIndex++];
randIndex &= 0x1FF;
}
randToGo--;
}
if (numReps == kRleModeRepSize)
{
for (; b > 0; b--)
{
crc.UpdateByte(prevByte);
m_OutStream.WriteByte((Byte)prevByte);
}
numReps = 0;
continue;
}
if (b != prevByte)
numReps = 0;
numReps++;
prevByte = b;
crc.UpdateByte(b);
m_OutStream.WriteByte((Byte)b);
}
while(--blockSize != 0);
return crc.GetDigest();
}
CDecoder::CDecoder()
{
#ifndef _7ZIP_ST
m_States = 0;
m_NumThreadsPrev = 0;
NumThreads = 1;
#endif
_needInStreamInit = true;
}
#ifndef _7ZIP_ST
CDecoder::~CDecoder()
{
Free();
}
#define RINOK_THREAD(x) { WRes __result_ = (x); if(__result_ != 0) return __result_; }
HRESULT CDecoder::Create()
{
RINOK_THREAD(CanProcessEvent.CreateIfNotCreated());
RINOK_THREAD(CanStartWaitingEvent.CreateIfNotCreated());
if (m_States != 0 && m_NumThreadsPrev == NumThreads)
return S_OK;
Free();
MtMode = (NumThreads > 1);
m_NumThreadsPrev = NumThreads;
try
{
m_States = new CState[NumThreads];
if (!m_States)
return E_OUTOFMEMORY;
}
catch(...) { return E_OUTOFMEMORY; }
for (UInt32 t = 0; t < NumThreads; t++)
{
CState &ti = m_States[t];
ti.Decoder = this;
if (MtMode)
{
HRESULT res = ti.Create();
if (res != S_OK)
{
NumThreads = t;
Free();
return res;
}
}
}
return S_OK;
}
void CDecoder::Free()
{
if (!m_States)
return;
CloseThreads = true;
CanProcessEvent.Set();
for (UInt32 t = 0; t < NumThreads; t++)
{
CState &s = m_States[t];
if (MtMode)
s.Thread.Wait();
s.Free();
}
delete []m_States;
m_States = 0;
}
#endif
HRESULT CDecoder::ReadSignatures(bool &wasFinished, UInt32 &crc)
{
wasFinished = false;
Byte s[6];
for (int i = 0; i < 6; i++)
s[i] = ReadByte();
crc = ReadCrc();
if (s[0] == kFinSig0)
{
if (s[1] != kFinSig1 ||
s[2] != kFinSig2 ||
s[3] != kFinSig3 ||
s[4] != kFinSig4 ||
s[5] != kFinSig5)
return S_FALSE;
wasFinished = true;
return (crc == CombinedCrc.GetDigest()) ? S_OK : S_FALSE;
}
if (s[0] != kBlockSig0 ||
s[1] != kBlockSig1 ||
s[2] != kBlockSig2 ||
s[3] != kBlockSig3 ||
s[4] != kBlockSig4 ||
s[5] != kBlockSig5)
return S_FALSE;
CombinedCrc.Update(crc);
return S_OK;
}
HRESULT CDecoder::DecodeFile(bool &isBZ, ICompressProgressInfo *progress)
{
Progress = progress;
#ifndef _7ZIP_ST
RINOK(Create());
for (UInt32 t = 0; t < NumThreads; t++)
{
CState &s = m_States[t];
if (!s.Alloc())
return E_OUTOFMEMORY;
if (MtMode)
{
RINOK(s.StreamWasFinishedEvent.Reset());
RINOK(s.WaitingWasStartedEvent.Reset());
RINOK(s.CanWriteEvent.Reset());
}
}
#else
if (!m_States[0].Alloc())
return E_OUTOFMEMORY;
#endif
isBZ = false;
Byte s[6];
int i;
for (i = 0; i < 4; i++)
s[i] = ReadByte();
if (s[0] != kArSig0 ||
s[1] != kArSig1 ||
s[2] != kArSig2 ||
s[3] <= kArSig3 ||
s[3] > kArSig3 + kBlockSizeMultMax)
return S_OK;
isBZ = true;
UInt32 dicSize = (UInt32)(s[3] - kArSig3) * kBlockSizeStep;
CombinedCrc.Init();
#ifndef _7ZIP_ST
if (MtMode)
{
NextBlockIndex = 0;
StreamWasFinished1 = StreamWasFinished2 = false;
CloseThreads = false;
CanStartWaitingEvent.Reset();
m_States[0].CanWriteEvent.Set();
BlockSizeMax = dicSize;
Result1 = Result2 = S_OK;
CanProcessEvent.Set();
UInt32 t;
for (t = 0; t < NumThreads; t++)
m_States[t].StreamWasFinishedEvent.Lock();
CanProcessEvent.Reset();
CanStartWaitingEvent.Set();
for (t = 0; t < NumThreads; t++)
m_States[t].WaitingWasStartedEvent.Lock();
CanStartWaitingEvent.Reset();
RINOK(Result2);
RINOK(Result1);
}
else
#endif
{
CState &state = m_States[0];
for (;;)
{
RINOK(SetRatioProgress(m_InStream.GetProcessedSize()));
bool wasFinished;
UInt32 crc;
RINOK(ReadSignatures(wasFinished, crc));
if (wasFinished)
return S_OK;
UInt32 blockSize, origPtr;
bool randMode;
RINOK(ReadBlock(&m_InStream, state.Counters, dicSize,
m_Selectors, m_HuffmanDecoders,
&blockSize, &origPtr, &randMode));
DecodeBlock1(state.Counters, blockSize);
if ((randMode ?
DecodeBlock2Rand(state.Counters + 256, blockSize, origPtr, m_OutStream) :
DecodeBlock2(state.Counters + 256, blockSize, origPtr, m_OutStream)) != crc)
return S_FALSE;
}
}
return SetRatioProgress(m_InStream.GetProcessedSize());
}
HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream,
bool &isBZ, ICompressProgressInfo *progress)
{
isBZ = false;
try
{
if (!m_InStream.Create(kBufferSize))
return E_OUTOFMEMORY;
if (!m_OutStream.Create(kBufferSize))
return E_OUTOFMEMORY;
if (inStream)
m_InStream.SetStream(inStream);
CDecoderFlusher flusher(this, inStream != NULL);
if (_needInStreamInit)
{
m_InStream.Init();
_needInStreamInit = false;
}
_inStart = m_InStream.GetProcessedSize();
m_InStream.AlignToByte();
m_OutStream.SetStream(outStream);
m_OutStream.Init();
RINOK(DecodeFile(isBZ, progress));
flusher.NeedFlush = false;
return Flush();
}
catch(const CInBufferException &e) { return e.ErrorCode; }
catch(const COutBufferException &e) { return e.ErrorCode; }
catch(...) { return E_FAIL; }
}
STDMETHODIMP CDecoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 * /* inSize */, const UInt64 * /* outSize */, ICompressProgressInfo *progress)
{
_needInStreamInit = true;
bool isBZ;
RINOK(CodeReal(inStream, outStream, isBZ, progress));
return isBZ ? S_OK : S_FALSE;
}
HRESULT CDecoder::CodeResume(ISequentialOutStream *outStream, bool &isBZ, ICompressProgressInfo *progress)
{
return CodeReal(NULL, outStream, isBZ, progress);
}
STDMETHODIMP CDecoder::SetInStream(ISequentialInStream *inStream) { m_InStream.SetStream(inStream); return S_OK; }
STDMETHODIMP CDecoder::ReleaseInStream() { m_InStream.ReleaseStream(); return S_OK; }
#ifndef _7ZIP_ST
static THREAD_FUNC_DECL MFThread(void *p) { ((CState *)p)->ThreadFunc(); return 0; }
HRESULT CState::Create()
{
RINOK_THREAD(StreamWasFinishedEvent.CreateIfNotCreated());
RINOK_THREAD(WaitingWasStartedEvent.CreateIfNotCreated());
RINOK_THREAD(CanWriteEvent.CreateIfNotCreated());
RINOK_THREAD(Thread.Create(MFThread, this));
return S_OK;
}
void CState::FinishStream()
{
Decoder->StreamWasFinished1 = true;
StreamWasFinishedEvent.Set();
Decoder->CS.Leave();
Decoder->CanStartWaitingEvent.Lock();
WaitingWasStartedEvent.Set();
}
void CState::ThreadFunc()
{
for (;;)
{
Decoder->CanProcessEvent.Lock();
Decoder->CS.Enter();
if (Decoder->CloseThreads)
{
Decoder->CS.Leave();
return;
}
if (Decoder->StreamWasFinished1)
{
FinishStream();
continue;
}
HRESULT res = S_OK;
UInt32 blockIndex = Decoder->NextBlockIndex;
UInt32 nextBlockIndex = blockIndex + 1;
if (nextBlockIndex == Decoder->NumThreads)
nextBlockIndex = 0;
Decoder->NextBlockIndex = nextBlockIndex;
UInt32 crc;
UInt64 packSize = 0;
UInt32 blockSize = 0, origPtr = 0;
bool randMode = false;
try
{
bool wasFinished;
res = Decoder->ReadSignatures(wasFinished, crc);
if (res != S_OK)
{
Decoder->Result1 = res;
FinishStream();
continue;
}
if (wasFinished)
{
Decoder->Result1 = res;
FinishStream();
continue;
}
res = ReadBlock(&Decoder->m_InStream, Counters, Decoder->BlockSizeMax,
Decoder->m_Selectors, Decoder->m_HuffmanDecoders,
&blockSize, &origPtr, &randMode);
if (res != S_OK)
{
Decoder->Result1 = res;
FinishStream();
continue;
}
packSize = Decoder->m_InStream.GetProcessedSize();
}
catch(const CInBufferException &e) { res = e.ErrorCode; if (res != S_OK) res = E_FAIL; }
catch(...) { res = E_FAIL; }
if (res != S_OK)
{
Decoder->Result1 = res;
FinishStream();
continue;
}
Decoder->CS.Leave();
DecodeBlock1(Counters, blockSize);
bool needFinish = true;
try
{
Decoder->m_States[blockIndex].CanWriteEvent.Lock();
needFinish = Decoder->StreamWasFinished2;
if (!needFinish)
{
if ((randMode ?
DecodeBlock2Rand(Counters + 256, blockSize, origPtr, Decoder->m_OutStream) :
DecodeBlock2(Counters + 256, blockSize, origPtr, Decoder->m_OutStream)) == crc)
res = Decoder->SetRatioProgress(packSize);
else
res = S_FALSE;
}
}
catch(const COutBufferException &e) { res = e.ErrorCode; if (res != S_OK) res = E_FAIL; }
catch(...) { res = E_FAIL; }
if (res != S_OK)
{
Decoder->Result2 = res;
Decoder->StreamWasFinished2 = true;
}
Decoder->m_States[nextBlockIndex].CanWriteEvent.Set();
if (res != S_OK || needFinish)
{
StreamWasFinishedEvent.Set();
Decoder->CanStartWaitingEvent.Lock();
WaitingWasStartedEvent.Set();
}
}
}
STDMETHODIMP CDecoder::SetNumberOfThreads(UInt32 numThreads)
{
NumThreads = numThreads;
if (NumThreads < 1)
NumThreads = 1;
if (NumThreads > kNumThreadsMax)
NumThreads = kNumThreadsMax;
return S_OK;
}
#endif
HRESULT CDecoder::SetRatioProgress(UInt64 packSize)
{
if (!Progress)
return S_OK;
packSize -= _inStart;
UInt64 unpackSize = m_OutStream.GetProcessedSize();
return Progress->SetRatioInfo(&packSize, &unpackSize);
}
// ---------- NSIS ----------
enum
{
NSIS_STATE_INIT,
NSIS_STATE_NEW_BLOCK,
NSIS_STATE_DATA,
NSIS_STATE_FINISHED,
NSIS_STATE_ERROR
};
STDMETHODIMP CNsisDecoder::SetInStream(ISequentialInStream *inStream) { m_InStream.SetStream(inStream); return S_OK; }
STDMETHODIMP CNsisDecoder::ReleaseInStream() { m_InStream.ReleaseStream(); return S_OK; }
STDMETHODIMP CNsisDecoder::SetOutStreamSize(const UInt64 * /* outSize */)
{
_nsisState = NSIS_STATE_INIT;
return S_OK;
}
STDMETHODIMP CNsisDecoder::Read(void *data, UInt32 size, UInt32 *processedSize)
{
try {
*processedSize = 0;
if (_nsisState == NSIS_STATE_FINISHED)
return S_OK;
if (_nsisState == NSIS_STATE_ERROR)
return S_FALSE;
if (size == 0)
return S_OK;
CState &state = m_State;
if (_nsisState == NSIS_STATE_INIT)
{
if (!m_InStream.Create(kBufferSize))
return E_OUTOFMEMORY;
if (!state.Alloc())
return E_OUTOFMEMORY;
m_InStream.Init();
_nsisState = NSIS_STATE_NEW_BLOCK;
}
if (_nsisState == NSIS_STATE_NEW_BLOCK)
{
Byte b = (Byte)m_InStream.ReadBits(8);
if (b == kFinSig0)
{
_nsisState = NSIS_STATE_FINISHED;
return S_OK;
}
if (b != kBlockSig0)
{
_nsisState = NSIS_STATE_ERROR;
return S_FALSE;
}
UInt32 origPtr;
RINOK(ReadBlock(&m_InStream, state.Counters, 9 * kBlockSizeStep,
m_Selectors, m_HuffmanDecoders, &_blockSize, &origPtr, NULL));
DecodeBlock1(state.Counters, _blockSize);
const UInt32 *tt = state.Counters + 256;
_tPos = tt[tt[origPtr] >> 8];
_prevByte = (unsigned)(_tPos & 0xFF);
_numReps = 0;
_repRem = 0;
_nsisState = NSIS_STATE_DATA;
}
UInt32 tPos = _tPos;
unsigned prevByte = _prevByte;
unsigned numReps = _numReps;
UInt32 blockSize = _blockSize;
const UInt32 *tt = state.Counters + 256;
while (_repRem)
{
_repRem--;
*(Byte *)data = (Byte)prevByte;
data = (Byte *)data + 1;
(*processedSize)++;
if (--size == 0)
return S_OK;
}
if (blockSize == 0)
{
_nsisState = NSIS_STATE_NEW_BLOCK;
return S_OK;
}
do
{
unsigned b = (unsigned)(tPos & 0xFF);
tPos = tt[tPos >> 8];
blockSize--;
if (numReps == kRleModeRepSize)
{
numReps = 0;
while (b)
{
b--;
*(Byte *)data = (Byte)prevByte;
data = (Byte *)data + 1;
(*processedSize)++;
if (--size == 0)
break;
}
_repRem = b;
continue;
}
if (b != prevByte)
numReps = 0;
numReps++;
prevByte = b;
*(Byte *)data = (Byte)b;
data = (Byte *)data + 1;
(*processedSize)++;
size--;
}
while (size && blockSize);
_tPos = tPos;
_prevByte = prevByte;
_numReps = numReps;
_blockSize = blockSize;
return S_OK;
}
catch(const CInBufferException &e) { return e.ErrorCode; }
catch(...) { return S_FALSE; }
}
}}
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