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();
}
// blockSize > 0
UInt32 CThreadInfo::EncodeBlockWithHeaders(const Byte *block, UInt32 blockSize)
{
WriteByte2(kBlockSig0);
WriteByte2(kBlockSig1);
WriteByte2(kBlockSig2);
WriteByte2(kBlockSig3);
WriteByte2(kBlockSig4);
WriteByte2(kBlockSig5);
CBZip2Crc crc;
int numReps = 0;
Byte prevByte = block[0];
UInt32 i = 0;
do
{
Byte b = block[i];
if (numReps == kRleModeRepSize)
{
for (; b > 0; b--)
crc.UpdateByte(prevByte);
numReps = 0;
continue;
}
if (prevByte == b)
numReps++;
else
{
numReps = 1;
prevByte = b;
}
crc.UpdateByte(b);
}
while (++i < blockSize);
UInt32 crcRes = crc.GetDigest();
WriteCrc2(crcRes);
EncodeBlock(block, blockSize);
return crcRes;
}
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();
}
