private uint Flush(Stream oldStream, Stream patchFileStream, Stream bufferStream, Stream newStream, bool withCrc, uint crc)
{
Stream srcStream = null;
if (this.bufferStartIndex > -1) //使用缓冲流
{
srcStream = bufferStream;
srcStream.Seek(this.bufferStartIndex, SeekOrigin.Begin);
}
else //使用原始流
{
switch (this.OperType)
{
case 0:
srcStream = patchFileStream;
break;
case 2:
srcStream = oldStream;
srcStream.Seek(this.StartPosition, SeekOrigin.Begin);
break;
}
}
//执行更新
switch (this.OperType)
{
case 0:
case 2:
if (withCrc)
{
crc = StreamUtils.MoveStreamWithCrc32(srcStream, newStream, this.Length, crc);
}
else
{
StreamUtils.CopyStream(srcStream, newStream, this.Length);
}
break;
case 1:
if (withCrc)
{
crc = StreamUtils.FillStreamWithCrc32(newStream, this.Length, this.FillByte, crc);
}
else
{
StreamUtils.FillStream(newStream, this.Length, this.FillByte);
}
break;
}
return(crc);
}