public override int Read(byte[] buffer, int offset, int count)
{
if (count == 0)
{
return(0);
}
if (Position + count > Length) // Length will send HTTP request
{
return(0);
}
int rem;
var pagesToRead = Math.DivRem(_offset + count, PageBlobAppendStream.PageDataSize, out rem);
if (rem > 0)
{
pagesToRead++;
}
var pagesBuffer = ReadPages(pagesToRead);
using (var targetWriter = new BinaryWriter(new MemoryStream(buffer)))
using (var pageReader = new BinaryReader(new MemoryStream(pagesBuffer)))
{
targetWriter.BaseStream.Seek(offset, SeekOrigin.Begin);
var rest = count;
do
{
var pageDataSize = pageReader.ReadInt16(); // Must read PageDataLengthType type
// Move to current reading position
if (_offset != 0)
{
pageReader.ReadBytes(_offset);
}
var bytesToRead = (PageDataLengthType)(Math.Min(_offset + rest, pageDataSize) - _offset);
rest -= bytesToRead;
var bytes = pageReader.ReadBytes(bytesToRead);
targetWriter.Write(bytes);
_offset += bytesToRead;
if (_offset != PageBlobAppendStream.PageDataSize)
{
continue;
}
_offset = 0;
_pageIndex++;
} while (rest > 0);
}
return(count);
}
public void Append(byte[] buffer, int offset, PageDataLengthType count)
{
if (Length + count > PageDataSize)
{
throw new ArgumentOutOfRangeException("count");
}
using (var bw = new BinaryWriter(new MemoryStream(_data)))
{
bw.BaseStream.Seek(Length, SeekOrigin.Begin);
bw.Write(buffer, offset, count);
Length += count;
}
}
