private int Read(byte[] buffer, int offset, int count)
{
var result = mInput.Read(buffer, offset, count);
mPosition += result;
return(result);
}
private void EnsureOutputData()
{
while (mDecoder.AvailableOutputLength == 0 && !mDecoder.IsOutputComplete)
{
if (mOffset == mEnding)
{
mOffset = 0;
mEnding = 0;
var fetched = mInput.Read(mBuffer, 0, mBuffer.Length);
System.Diagnostics.Debug.Assert(0 <= fetched && fetched <= mBuffer.Length);
if (fetched == 0)
{
mDecoder.Decode(null, 0, 0, null, true);
System.Diagnostics.Debug.Assert(mDecoder.AvailableOutputLength > 0 || mDecoder.IsOutputComplete);
continue;
}
mEnding = fetched;
}
var written = mDecoder.Decode(mBuffer, mOffset, mEnding - mOffset, (int)Math.Min(Int32.MaxValue, mLength - mPosition), false);
System.Diagnostics.Debug.Assert(0 <= written && written <= mEnding - mOffset);
mOffset += written;
}
}
private int DecodeInto(byte[] buffer, int offset, int count)
{
if (mOffset == mEnding)
{
mOffset = 0;
mEnding = 0;
}
while (mEnding - mOffset < 5)
{
if (mInputEnd)
{
// if less than 5 bytes are left they are copied
int n = 0;
while (mOffset < mEnding && count > 0)
{
buffer[offset++] = mBuffer[mOffset++];
count--;
n++;
}
return(n);
}
if (mBuffer.Length - mOffset < 5)
{
Buffer.BlockCopy(mBuffer, mOffset, mBuffer, 0, mEnding - mOffset);
mEnding -= mOffset;
mOffset = 0;
}
int delta = mInput.Read(mBuffer, mEnding, mBuffer.Length - mEnding);
if (delta == 0)
{
mInputEnd = true;
}
else
{
mEnding += delta;
}
}
unsafe
{
fixed(byte *pBuffer = mBuffer)
{
int delta = x86_Convert(pBuffer + mOffset, Math.Min(mEnding - mOffset, count), (uint)mBufferPos);
if (delta == 0)
{
throw new NotSupportedException();
}
Buffer.BlockCopy(mBuffer, mOffset, buffer, offset, delta);
mOffset += delta;
mBufferPos += delta;
return(delta);
}
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (mInput == null)
{
throw new InvalidOperationException();
}
return(mInput.Read(buffer, offset, count));
}
public byte ReadByte()
{
if (mStream.Read(mBuffer, 0, 1) == 0)
{
throw new EndOfStreamException();
}
return(mBuffer[0]);
}
private void Decode()
{
if (mBufferOffset == mBufferEnding)
{
#if DEBUG
// Avoid confusing people if they break into the debugger before mBufferOffset has been updated.
mBufferOffset = 0;
mBufferEnding = 0;
#endif
mBufferEnding = mInput.Read(mBuffer, 0, mBuffer.Length);
mBufferOffset = mDecoder.Decode(mBuffer, 0, mBufferEnding, null, mBufferEnding == 0);
}
else
{
mBufferOffset += mDecoder.Decode(mBuffer, mBufferOffset, mBufferEnding - mBufferOffset, null, false);
}
}
public int Read(byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0 || offset > buffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (count < 0 || count > buffer.Length - offset)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (count == 0)
{
return(0);
}
return(mOutputStream.Read(buffer, offset, count));
}
public IEnumerable <byte> Run()
{
const uint kBurstSize = (1u << 18);
var tempBuffer = new byte[1];
byte prevByte = 0;
uint processedBytes = 0;
for (;;)
{
byte b = 0;
uint i;
for (i = 0; i < kBurstSize; i++)
{
if (mMainStream.Read(tempBuffer, 0, 1) == 0)
{
yield break;
}
b = tempBuffer[0];
mWritten++; yield return(b);
if (IsJ(prevByte, b))
{
break;
}
prevByte = b;
}
processedBytes += i;
if (i == kBurstSize)
{
continue;
}
if (mStatusDecoder[GetIndex(prevByte, b)].Decode(mRangeDecoder) == 1)
{
var s = (b == 0xE8) ? mCallStream : mJumpStream;
uint src = 0;
for (i = 0; i < 4; i++)
{
if (s.Read(tempBuffer, 0, 1) == 0)
{
throw new EndOfStreamException();
}
src <<= 8;
src |= tempBuffer[0];
}
uint dest = src - (uint)(mWritten + 4);
mWritten++; yield return((byte)dest);
mWritten++; yield return((byte)(dest >> 8));
mWritten++; yield return((byte)(dest >> 16));
mWritten++; yield return((byte)(dest >> 24));
prevByte = (byte)(dest >> 24);
processedBytes += 4;
}
else
{
prevByte = b;
}
}
}