private int ReadDelimiter(byte[] buffer, int offset, int count)
{
Debug.Assert(null != buffer, "null != buffer");
Debug.Assert(0 <= offset, "0 <= offset");
Debug.Assert(0 <= count, "0 <= count");
Debug.Assert(offset + count <= buffer.Length, "offset + count <= buffer.Length");
int copied = 0;
string boundary = null;
string boundary1 = this.batchBoundary;
string boundary2 = this.changesetBoundary;
while ((0 < count) && (0 < this.batchLength) && this.ReadBuffer())
{
int boundaryIndex = 0;
int boundary1Index = 0;
int boundary2Index = 0;
int size = Math.Min(Math.Min(count, this.byteLength), this.batchLength) + this.bytePosition;
byte[] data = this.byteBuffer;
for (int i = this.bytePosition; i < size; ++i)
{
byte value = data[i];
buffer[offset++] = value;
if ((char)value == boundary1[boundary1Index])
{
if (boundary1.Length == ++boundary1Index)
{
size = (1 + i) - boundary1Index;
offset -= boundary1Index;
Debug.Assert(this.bytePosition <= size, "negative size");
break;
}
}
else
{
boundary1Index = 0;
}
if ((null != boundary2) && ((char)value == boundary2[boundary2Index]))
{
if (boundary2.Length == ++boundary2Index)
{
size = (1 + i) - boundary2Index;
offset -= boundary2Index;
Debug.Assert(this.bytePosition <= size, "negative size");
break;
}
}
else
{
boundary2Index = 0;
}
}
size -= this.bytePosition;
Debug.Assert(0 <= size, "negative size");
if (boundary1Index < boundary2Index)
{
boundaryIndex = boundary2Index;
boundary = boundary2;
}
else
{
Debug.Assert(null != boundary1, "batch boundary shouldn't be null");
boundaryIndex = boundary1Index;
boundary = boundary1;
}
if (size == this.batchLength)
{
boundaryIndex = 0;
}
if ((0 < boundaryIndex) && (boundary.Length != boundaryIndex))
{
if ((size + copied == boundaryIndex) && (boundaryIndex < this.byteLength))
{
throw Error.BatchStreamInternalBufferRequestTooSmall();
}
else
{
size -= boundaryIndex;
offset -= boundaryIndex;
}
}
this.totalCount += size;
this.bytePosition += size;
this.byteLength -= size;
this.batchLength -= size;
count -= size;
copied += size;
if (boundaryIndex > 0 && copied >= 2 && buffer[copied - 2] == '\r' && buffer[copied - 1] == '\n')
{
copied -= 2;
}
if (boundary.Length == boundaryIndex)
{
break;
}
else if (0 < boundaryIndex)
{
if (boundaryIndex == this.byteLength)
{
if (0 < this.bytePosition)
{
Buffer.BlockCopy(data, this.bytePosition, data, 0, this.byteLength);
this.bytePosition = 0;
}
int tmp = this.reader.Read(this.byteBuffer, this.byteLength, this.byteBuffer.Length - this.byteLength);
if (null != this.writer)
{
this.writer.Write(this.byteBuffer, this.byteLength, tmp);
}
if (0 == tmp)
{
this.totalCount += boundaryIndex;
this.bytePosition += boundaryIndex;
this.byteLength -= boundaryIndex;
this.batchLength -= boundaryIndex;
offset += boundaryIndex;
count -= boundaryIndex;
copied += boundaryIndex;
break;
}
this.byteLength += tmp;
}
else
{
break;
}
}
}
return(copied);
}