Simone
d074cc7c07
Plugin: ns7zip v2.0.0 Architectures: x86-ansi, x86-unicode, amd64-unicode License: LGPL-2.1-or-later
473 lines
12 KiB
C++
473 lines
12 KiB
C++
// Rar2Decoder.cpp
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// According to unRAR license, this code may not be used to develop
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// a program that creates RAR archives
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#include "StdAfx.h"
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#include <stdlib.h>
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#include "Rar2Decoder.h"
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namespace NCompress {
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namespace NRar2 {
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namespace NMultimedia {
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#define my_abs(x) (unsigned)abs(x)
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Byte CFilter::Decode(int &channelDelta, Byte deltaByte)
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{
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D4 = D3;
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D3 = D2;
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D2 = LastDelta - D1;
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D1 = LastDelta;
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const int predictedValue = ((8 * LastChar + K1 * D1 + K2 * D2 + K3 * D3 + K4 * D4 + K5 * channelDelta) >> 3);
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const Byte realValue = (Byte)(predictedValue - deltaByte);
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{
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const int i = ((int)(signed char)deltaByte) << 3;
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Dif[0] += my_abs(i);
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Dif[1] += my_abs(i - D1);
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Dif[2] += my_abs(i + D1);
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Dif[3] += my_abs(i - D2);
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Dif[4] += my_abs(i + D2);
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Dif[5] += my_abs(i - D3);
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Dif[6] += my_abs(i + D3);
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Dif[7] += my_abs(i - D4);
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Dif[8] += my_abs(i + D4);
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Dif[9] += my_abs(i - channelDelta);
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Dif[10] += my_abs(i + channelDelta);
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}
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channelDelta = LastDelta = (signed char)(realValue - LastChar);
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LastChar = realValue;
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if (((++ByteCount) & 0x1F) == 0)
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{
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UInt32 minDif = Dif[0];
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UInt32 numMinDif = 0;
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Dif[0] = 0;
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for (unsigned i = 1; i < Z7_ARRAY_SIZE(Dif); i++)
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{
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if (Dif[i] < minDif)
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{
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minDif = Dif[i];
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numMinDif = i;
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}
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Dif[i] = 0;
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}
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switch (numMinDif)
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{
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case 1: if (K1 >= -16) K1--; break;
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case 2: if (K1 < 16) K1++; break;
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case 3: if (K2 >= -16) K2--; break;
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case 4: if (K2 < 16) K2++; break;
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case 5: if (K3 >= -16) K3--; break;
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case 6: if (K3 < 16) K3++; break;
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case 7: if (K4 >= -16) K4--; break;
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case 8: if (K4 < 16) K4++; break;
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case 9: if (K5 >= -16) K5--; break;
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case 10:if (K5 < 16) K5++; break;
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}
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}
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return realValue;
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}
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}
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static const UInt32 kHistorySize = 1 << 20;
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// static const UInt32 kWindowReservSize = (1 << 22) + 256;
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CDecoder::CDecoder():
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_isSolid(false),
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_solidAllowed(false),
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m_TablesOK(false)
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{
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}
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void CDecoder::InitStructures()
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{
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m_MmFilter.Init();
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for (unsigned i = 0; i < kNumReps; i++)
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m_RepDists[i] = 0;
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m_RepDistPtr = 0;
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m_LastLength = 0;
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memset(m_LastLevels, 0, kMaxTableSize);
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}
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UInt32 CDecoder::ReadBits(unsigned numBits) { return m_InBitStream.ReadBits(numBits); }
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#define RIF(x) { if (!(x)) return false; }
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static const unsigned kRepBothNumber = 256;
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static const unsigned kRepNumber = kRepBothNumber + 1;
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static const unsigned kLen2Number = kRepNumber + kNumReps;
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static const unsigned kReadTableNumber = kLen2Number + kNumLen2Symbols;
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static const unsigned kMatchNumber = kReadTableNumber + 1;
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// static const unsigned kDistTableStart = kMainTableSize;
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// static const unsigned kLenTableStart = kDistTableStart + kDistTableSize;
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static const UInt32 kDistStart [kDistTableSize] = {0,1,2,3,4,6,8,12,16,24,32,48,64,96,128,192,256,384,512,768,1024,1536,2048,3072,4096,6144,8192,12288,16384,24576,32768U,49152U,65536,98304,131072,196608,262144,327680,393216,458752,524288,589824,655360,720896,786432,851968,917504,983040};
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static const Byte kDistDirectBits[kDistTableSize] = {0,0,0,0,1,1,2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16};
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static const Byte kLen2DistStarts [kNumLen2Symbols]={0,4,8,16,32,64,128,192};
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static const Byte kLen2DistDirectBits[kNumLen2Symbols]={2,2,3, 4, 5, 6, 6, 6};
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static const UInt32 kDistLimit2 = 0x101 - 1;
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static const UInt32 kDistLimit3 = 0x2000 - 1;
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static const UInt32 kDistLimit4 = 0x40000 - 1;
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// static const UInt32 kMatchMaxLen = 255 + 2;
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// static const UInt32 kMatchMaxLenMax = 255 + 5;
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bool CDecoder::ReadTables(void)
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{
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m_TablesOK = false;
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const unsigned kLevelTableSize = 19;
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Byte levelLevels[kLevelTableSize];
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Byte lens[kMaxTableSize];
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m_AudioMode = (ReadBits(1) == 1);
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if (ReadBits(1) == 0)
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memset(m_LastLevels, 0, kMaxTableSize);
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unsigned numLevels;
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if (m_AudioMode)
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{
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m_NumChannels = ReadBits(2) + 1;
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if (m_MmFilter.CurrentChannel >= m_NumChannels)
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m_MmFilter.CurrentChannel = 0;
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numLevels = m_NumChannels * k_MM_TableSize;
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}
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else
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numLevels = kHeapTablesSizesSum;
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unsigned i;
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for (i = 0; i < kLevelTableSize; i++)
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levelLevels[i] = (Byte)ReadBits(4);
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NHuffman::CDecoder256<kNumHufBits, kLevelTableSize, 6> m_LevelDecoder;
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RIF(m_LevelDecoder.Build(levelLevels, NHuffman::k_BuildMode_Full))
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i = 0;
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do
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{
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const unsigned sym = m_LevelDecoder.DecodeFull(&m_InBitStream);
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if (sym < 16)
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{
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lens[i] = (Byte)((sym + m_LastLevels[i]) & 15);
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i++;
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}
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#if 0
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else if (sym >= kLevelTableSize)
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return false;
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#endif
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else
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{
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unsigned num;
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Byte v;
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if (sym == 16)
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{
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if (i == 0)
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return false;
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num = ReadBits(2) + 3;
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v = lens[(size_t)i - 1];
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}
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else
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{
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num = (sym - 17) * 4;
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num += num + 3 + ReadBits(3 + num);
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v = 0;
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}
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num += i;
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if (num > numLevels)
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{
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// return false;
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num = numLevels; // original unRAR
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}
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do
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lens[i++] = v;
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while (i < num);
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}
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}
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while (i < numLevels);
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if (m_InBitStream.ExtraBitsWereRead())
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return false;
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if (m_AudioMode)
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for (i = 0; i < m_NumChannels; i++)
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{
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RIF(m_MMDecoders[i].Build(&lens[(size_t)i * k_MM_TableSize]))
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}
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else
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{
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RIF(m_MainDecoder.Build(&lens[0]))
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RIF(m_DistDecoder.Build(&lens[kMainTableSize]))
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RIF(m_LenDecoder.Build(&lens[kMainTableSize + kDistTableSize]))
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}
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memcpy(m_LastLevels, lens, kMaxTableSize);
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m_TablesOK = true;
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return true;
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}
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bool CDecoder::ReadLastTables()
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{
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// it differs a little from pure RAR sources;
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// UInt64 ttt = m_InBitStream.GetProcessedSize() + 2;
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// + 2 works for: return 0xFF; in CInBuffer::ReadByte.
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if (m_InBitStream.GetProcessedSize() + 7 <= m_PackSize) // test it: probably incorrect;
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// if (m_InBitStream.GetProcessedSize() + 2 <= m_PackSize) // test it: probably incorrect;
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{
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if (m_AudioMode)
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{
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const unsigned symbol = m_MMDecoders[m_MmFilter.CurrentChannel].Decode(&m_InBitStream);
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if (symbol == 256)
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return ReadTables();
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if (symbol >= k_MM_TableSize)
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return false;
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}
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else
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{
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const unsigned sym = m_MainDecoder.Decode(&m_InBitStream);
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if (sym == kReadTableNumber)
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return ReadTables();
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if (sym >= kMainTableSize)
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return false;
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}
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}
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return true;
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}
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bool CDecoder::DecodeMm(UInt32 pos)
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{
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while (pos-- != 0)
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{
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const unsigned symbol = m_MMDecoders[m_MmFilter.CurrentChannel].Decode(&m_InBitStream);
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if (m_InBitStream.ExtraBitsWereRead())
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return false;
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if (symbol >= 256)
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return symbol == 256;
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/*
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Byte byPredict = m_Predictor.Predict();
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Byte byReal = (Byte)(byPredict - (Byte)symbol);
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m_Predictor.Update(byReal, byPredict);
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*/
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const Byte byReal = m_MmFilter.Decode((Byte)symbol);
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m_OutWindowStream.PutByte(byReal);
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if (++m_MmFilter.CurrentChannel == m_NumChannels)
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m_MmFilter.CurrentChannel = 0;
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}
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return true;
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}
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typedef unsigned CLenType;
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static inline CLenType SlotToLen(CBitDecoder &_bitStream, CLenType slot)
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{
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const unsigned numBits = ((unsigned)slot >> 2) - 1;
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return ((4 | (slot & 3)) << numBits) + (CLenType)_bitStream.ReadBits(numBits);
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}
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bool CDecoder::DecodeLz(Int32 pos)
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{
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while (pos > 0)
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{
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unsigned sym = m_MainDecoder.Decode(&m_InBitStream);
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if (m_InBitStream.ExtraBitsWereRead())
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return false;
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UInt32 len, distance;
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if (sym < 256)
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{
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m_OutWindowStream.PutByte(Byte(sym));
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pos--;
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continue;
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}
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else if (sym >= kMatchNumber)
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{
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if (sym >= kMainTableSize)
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return false;
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len = sym - kMatchNumber;
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if (len >= 8)
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len = SlotToLen(m_InBitStream, len);
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len += 3;
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sym = m_DistDecoder.Decode(&m_InBitStream);
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if (sym >= kDistTableSize)
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return false;
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distance = kDistStart[sym] + m_InBitStream.ReadBits(kDistDirectBits[sym]);
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if (distance >= kDistLimit3)
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{
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len += 2 - ((distance - kDistLimit4) >> 31);
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// len++;
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// if (distance >= kDistLimit4)
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// len++;
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}
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}
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else if (sym == kRepBothNumber)
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{
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len = m_LastLength;
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if (len == 0)
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return false;
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distance = m_RepDists[(m_RepDistPtr + 4 - 1) & 3];
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}
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else if (sym < kLen2Number)
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{
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distance = m_RepDists[(m_RepDistPtr - (sym - kRepNumber + 1)) & 3];
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len = m_LenDecoder.Decode(&m_InBitStream);
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if (len >= kLenTableSize)
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return false;
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if (len >= 8)
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len = SlotToLen(m_InBitStream, len);
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len += 2;
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if (distance >= kDistLimit2)
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{
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len++;
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if (distance >= kDistLimit3)
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{
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len += 2 - ((distance - kDistLimit4) >> 31);
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// len++;
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// if (distance >= kDistLimit4)
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// len++;
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}
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}
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}
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else if (sym < kReadTableNumber)
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{
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sym -= kLen2Number;
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distance = kLen2DistStarts[sym] +
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m_InBitStream.ReadBits(kLen2DistDirectBits[sym]);
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len = 2;
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}
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else // (sym == kReadTableNumber)
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return true;
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m_RepDists[m_RepDistPtr++ & 3] = distance;
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m_LastLength = len;
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if (!m_OutWindowStream.CopyBlock(distance, len))
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return false;
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pos -= len;
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}
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return true;
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}
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HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream,
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const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress)
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{
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if (!inSize || !outSize)
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return E_INVALIDARG;
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if (_isSolid && !_solidAllowed)
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return S_FALSE;
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_solidAllowed = false;
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if (!m_OutWindowStream.Create(kHistorySize))
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return E_OUTOFMEMORY;
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if (!m_InBitStream.Create(1 << 20))
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return E_OUTOFMEMORY;
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m_PackSize = *inSize;
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UInt64 pos = 0, unPackSize = *outSize;
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m_OutWindowStream.SetStream(outStream);
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m_OutWindowStream.Init(_isSolid);
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m_InBitStream.SetStream(inStream);
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m_InBitStream.Init();
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// CCoderReleaser coderReleaser(this);
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if (!_isSolid)
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{
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InitStructures();
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if (unPackSize == 0)
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{
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if (m_InBitStream.GetProcessedSize() + 2 <= m_PackSize) // test it: probably incorrect;
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if (!ReadTables())
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return S_FALSE;
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_solidAllowed = true;
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return S_OK;
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}
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ReadTables();
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}
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if (!m_TablesOK)
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return S_FALSE;
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const UInt64 startPos = m_OutWindowStream.GetProcessedSize();
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while (pos < unPackSize)
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{
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UInt32 blockSize = 1 << 20;
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if (blockSize > unPackSize - pos)
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blockSize = (UInt32)(unPackSize - pos);
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UInt64 blockStartPos = m_OutWindowStream.GetProcessedSize();
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if (m_AudioMode)
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{
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if (!DecodeMm(blockSize))
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return S_FALSE;
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}
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else
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{
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if (!DecodeLz((Int32)blockSize))
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return S_FALSE;
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}
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if (m_InBitStream.ExtraBitsWereRead())
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return S_FALSE;
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const UInt64 globalPos = m_OutWindowStream.GetProcessedSize();
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pos = globalPos - blockStartPos;
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if (pos < blockSize)
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if (!ReadTables())
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return S_FALSE;
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pos = globalPos - startPos;
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if (progress)
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{
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const UInt64 packSize = m_InBitStream.GetProcessedSize();
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RINOK(progress->SetRatioInfo(&packSize, &pos))
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}
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}
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if (pos > unPackSize)
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return S_FALSE;
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if (!ReadLastTables())
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return S_FALSE;
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_solidAllowed = true;
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return m_OutWindowStream.Flush();
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}
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Z7_COM7F_IMF(CDecoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
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const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress))
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{
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try { return CodeReal(inStream, outStream, inSize, outSize, progress); }
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catch(const CInBufferException &e) { return e.ErrorCode; }
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catch(const CLzOutWindowException &e) { return e.ErrorCode; }
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catch(...) { return S_FALSE; }
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}
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Z7_COM7F_IMF(CDecoder::SetDecoderProperties2(const Byte *data, UInt32 size))
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{
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if (size < 1)
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return E_INVALIDARG;
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_isSolid = ((data[0] & 1) != 0);
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return S_OK;
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}
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}}
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