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// ZipPartStream.cs created with MonoDevelop
// User: alan at 13:13 23/10/2008
//
// To change standard headers go to Edit->Preferences->Coding->Standard Headers
//
using System;
using System.IO;
using zipsharp;
namespace System.IO.Packaging
{
internal class ZipPartStream : Stream
{
public MemoryStream BaseStream { get; private set; }
public ZipPackage Package { get; private set; }
public override bool CanRead {
get {
return BaseStream.CanRead;
}
}
public override bool CanSeek {
get {
return BaseStream.CanSeek;
}
}
public override bool CanTimeout {
get { return BaseStream.CanTimeout; }
}
public override bool CanWrite {
get { return Writeable; }
}
public override long Length {
get { return BaseStream.Length; }
}
public override long Position {
get; set;
}
public bool Writeable {
get; set;
}
public override int WriteTimeout {
get {
return BaseStream.WriteTimeout;
}
set {
BaseStream.WriteTimeout = value;
}
}
public override int ReadTimeout {
get {
return BaseStream.ReadTimeout;
}
set {
BaseStream.ReadTimeout = value;
}
}
public ZipPartStream (ZipPackage package, MemoryStream stream, FileAccess access)
{
BaseStream = stream;
Package = package;
Writeable = access != FileAccess.Read;
}
public override void Flush ()
{
// If the user flushes any of the part streams,
// we need to flush the entire package
// FIXME: Ensure that this actually happens with a testcase
// ...if possible
Package.Flush ();
}
public override int Read (byte[] buffer, int offset, int count)
{
Seek (Position, SeekOrigin.Begin);
int read = BaseStream.Read (buffer, offset, count);
Position += read;
return read;
}
public override long Seek (long offset, SeekOrigin origin)
{
Position = BaseStream.Seek (offset, origin);
return Position;
}
public override void SetLength (long value)
{
if (!CanWrite)
throw new InvalidOperationException ("Stream is not writeable");
BaseStream.SetLength (value);
}
public override void Write(byte[] buffer, int offset, int count)
{
if (!CanWrite)
throw new InvalidOperationException ("Stream is not writeable");
Seek (Position, SeekOrigin.Begin);
BaseStream.Write (buffer, offset, count);
Position += count;
}
}
}
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