private unsafe int GetBit()
{
uint hold = (uint)_hold;
int bits = _bits;
if (bits != 0)
{
bits--;
}
else if (_srcIndex < _break32Offset)
{
_srcIndex += 4;
hold = *((uint *)_pSrcBytes);
_pSrcBytes += 4;
bits = 31;
}
else if (_srcIndex < _breakOffset)
{
_srcIndex++;
hold = (uint)(*_pSrcBytes);
_pSrcBytes++;
bits = 7;
}
else
{
AcedMCException.ThrowReadBeyondTheEndException();
}
_hold = (int)(hold >> 1);
_bits = bits;
return((int)(hold & 1));
}
private unsafe int GetNBits(int n)
{
int hold = _hold;
int bits = _bits;
while (bits < n)
{
if (bits < 8 && _srcIndex < _break32Offset)
{
_srcIndex += 3;
hold |= (_pSrcBytes[0] | (_pSrcBytes[1] << 8) | (_pSrcBytes[2] << 16)) << bits;
_pSrcBytes += 3;
bits += 24;
}
else if (_srcIndex < _breakOffset)
{
_srcIndex++;
hold |= (*_pSrcBytes) << bits;
_pSrcBytes++;
bits += 8;
}
else
{
AcedMCException.ThrowReadBeyondTheEndException();
}
}
_hold = hold >> n;
_bits = bits - n;
return(hold & ((1 << n) - 1));
}
private unsafe int GetCode(int *tree)
{
int code = 1;
int hold = _hold;
do
{
while (_bits != 0)
{
code = tree[code + (hold & 1)];
hold >>= 1;
_bits--;
if (code <= 0)
{
goto CodeFound;
}
}
if (_srcIndex < _break32Offset)
{
_srcIndex += 4;
hold = *((int *)_pSrcBytes);
_pSrcBytes += 4;
code = tree[code + (hold & 1)];
hold = (int)((uint)hold >> 1);
_bits = 31;
}
else if (_srcIndex < _breakOffset)
{
_srcIndex++;
hold = (int)(*_pSrcBytes);
_pSrcBytes++;
code = tree[code + (hold & 1)];
hold >>= 1;
_bits = 7;
}
else
{
AcedMCException.ThrowReadBeyondTheEndException();
}
} while (code > 0);
CodeFound:
_hold = hold;
return(-code);
}
private unsafe void ReadNonCompressedBlock()
{
_inCounter += GetNBits(8);
int bits = _bits;
while (_inCounter > 0 && _outCounter > 0)
{
int hold = _hold;
if (bits < 8)
{
if (_srcIndex < _break32Offset)
{
_srcIndex += 3;
hold |= (_pSrcBytes[0] | (_pSrcBytes[1] << 8) | (_pSrcBytes[2] << 16)) << bits;
_pSrcBytes += 3;
bits += 24;
}
else if (_srcIndex < _breakOffset)
{
_srcIndex++;
hold |= (*_pSrcBytes) << bits;
_pSrcBytes++;
bits += 8;
}
else
{
AcedMCException.ThrowReadBeyondTheEndException();
}
}
_hold = hold >> 8;
bits -= 8;
*_pDstBytes = (byte)hold;
_inCounter--;
_outCounter--;
_pDstBytes++;
}
_bits = bits;
}