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//
// System.Web.HttpRequestStream
//
// Author:
// Patrik Torstensson (Patrik.Torstensson@labs2.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.IO;
namespace System.Web
{
class HttpRequestStream : Stream
{
byte [] _arrData;
int _iLength;
int _iOffset;
int _iPos;
internal HttpRequestStream ()
{
}
internal HttpRequestStream (byte [] buffer, int offset, int length)
{
Set (buffer, offset, length);
}
void Reset ()
{
Set (null, 0, 0);
}
internal void Set (byte [] buffer, int offset, int length)
{
_iPos = 0;
_iOffset = offset;
_iLength = length;
_arrData = buffer;
}
public override void Flush ()
{
}
public override void Close ()
{
Reset ();
}
public override int Read (byte [] buffer, int offset, int length)
{
int iBytes = length;
if (_iPos < _iOffset)
_iPos = _iOffset;
if (_iPos + length > _iOffset + _iLength) {
iBytes = (int) _iOffset + _iLength - _iPos;
}
if (iBytes <= 0) {
return 0;
}
Buffer.BlockCopy (_arrData, _iPos, buffer, offset, iBytes);
_iPos += iBytes;
return iBytes;
}
public override long Seek (long offset, SeekOrigin origin)
{
switch (origin) {
case SeekOrigin.Begin:
if (offset > _arrData.Length) {
throw new ArgumentException ();
}
_iPos = (int) offset;
break;
case SeekOrigin.Current:
if (((long) _iPos + offset > _arrData.Length) || (_iPos + (int) offset < 0)) {
throw new ArgumentException ();
}
_iPos += Convert.ToInt32 (offset);
break;
case SeekOrigin.End:
if (_arrData.Length - offset < 0) {
throw new ArgumentException();
}
_iPos = Convert.ToInt32 ( _arrData.Length - offset);
break;
}
return (long) _iPos;
}
public override void SetLength (long length)
{
throw new NotSupportedException ();
}
public override void Write (byte [] buffer, int offset, int length)
{
throw new NotSupportedException ();
}
public override bool CanRead {
get { return true; }
}
public override bool CanSeek {
get { return true; }
}
public override bool CanWrite {
get { return false; }
}
public byte [] Data {
get { return _arrData; }
}
public int DataLength {
get { return _iLength; }
}
public int DataOffset {
get { return _iOffset; }
}
public override long Length {
get { return (long) _arrData.Length; }
}
public override long Position {
get { return (long) _iPos; }
set { Seek (value, SeekOrigin.Begin); }
}
}
}
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