// Decompiled with JetBrains decompiler
// Type: Rei.Fs.PartialStream
// Assembly: Rei.Fs, Version=1.13.2.8796, Culture=neutral, PublicKeyToken=null
// MVID: D8B08A8B-697C-4439-9CFF-1BE4EE46F7B0
// Assembly location: F:\Eigene Dateien\Dropbox\portable Collection\Progs\CarotDAV\Rei.Fs.dll

using Microsoft.VisualBasic.CompilerServices;
using System;
using System.IO;
using System.Runtime.CompilerServices;

namespace Rei.Fs
{
  public class PartialStream : Stream
  {
    private Stream pBaseStream;
    private long pLength;
    private long pInnerPos;
    private long pStart;
    private int pLastCount;
    public object Tag;
    private object pSyncObject;
    private bool pHasError;
    private bool pDisposed;

    public PartialStream(Stream basestream, long length)
    {
      this.pHasError = false;
      this.pDisposed = false;
      this.pBaseStream = basestream;
      this.pLength = length;
      this.pInnerPos = 0L;
      if (!this.pBaseStream.CanSeek)
        return;
      this.pStart = this.pBaseStream.Position;
    }

    public Stream BaseStream
    {
      get
      {
        return this.pBaseStream;
      }
    }

    public override bool CanRead
    {
      get
      {
        return this.pBaseStream.CanRead;
      }
    }

    public override bool CanSeek
    {
      get
      {
        return this.pBaseStream.CanSeek;
      }
    }

    public override bool CanWrite
    {
      get
      {
        return this.pBaseStream.CanWrite;
      }
    }

    public override bool CanTimeout
    {
      get
      {
        return this.pBaseStream.CanTimeout;
      }
    }

    public override long Length
    {
      get
      {
        if (this.pLength < 0L)
          throw new NotSupportedException();
        return this.pLength;
      }
    }

    public override int ReadTimeout
    {
      get
      {
        return this.pBaseStream.ReadTimeout;
      }
      set
      {
        this.pBaseStream.ReadTimeout = value;
      }
    }

    public override int WriteTimeout
    {
      get
      {
        return this.pBaseStream.WriteTimeout;
      }
      set
      {
        this.pBaseStream.WriteTimeout = value;
      }
    }

    public override long Position
    {
      get
      {
        return this.pInnerPos;
      }
      set
      {
        this.Seek(value, SeekOrigin.Begin);
      }
    }

    public override long Seek(long offset, SeekOrigin origin)
    {
      try
      {
        switch (origin)
        {
          case SeekOrigin.Current:
            checked { offset += this.Position; }
            break;
          case SeekOrigin.End:
            if (this.pLength < 0L)
              throw new NotSupportedException();
            offset = checked (this.pLength - offset);
            break;
        }
        if (offset < 0L || this.pLength >= 0L && offset > this.pLength)
          throw new ArgumentOutOfRangeException();
        this.pBaseStream.Seek(checked (this.pStart + offset), SeekOrigin.Begin);
        this.pInnerPos = offset;
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
      long num;
      return num;
    }

    public override void SetLength(long value)
    {
      throw new NotSupportedException();
    }

    public override int Read(byte[] buffer, int offset, int count)
    {
      try
      {
        if (this.pInnerPos < 0L)
          this.Position = 0L;
        if (this.pLength >= 0L && checked (this.pInnerPos + (long) count) > this.pLength)
          count = checked ((int) (this.pLength - this.pInnerPos));
        int num = this.pBaseStream.Read(buffer, offset, count);
        this.pInnerPos = checked (this.pInnerPos + (long) num);
        if (num == 0 && count > 0 && (this.pLength >= 0L && this.pInnerPos < this.pLength))
          throw new IOException("Invalid Stream Length");
        return num;
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
    {
      try
      {
        if (this.pInnerPos < 0L)
          this.Position = 0L;
        if (this.pLength >= 0L && checked (this.pInnerPos + (long) count) > this.pLength)
          count = checked ((int) (this.pLength - this.pInnerPos));
        this.pLastCount = count;
        return this.pBaseStream.BeginRead(buffer, offset, count, callback, RuntimeHelpers.GetObjectValue(state));
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    public override int EndRead(IAsyncResult asyncResult)
    {
      try
      {
        int num = this.pBaseStream.EndRead(asyncResult);
        this.pInnerPos = checked (this.pInnerPos + (long) num);
        if (num == 0 && this.pLastCount > 0 && (this.pLength >= 0L && this.pInnerPos < this.pLength))
          throw new IOException("Invalid Stream Length");
        return num;
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
      try
      {
        if (this.pInnerPos < 0L)
          this.Position = 0L;
        if (this.pLength >= 0L && checked (this.pInnerPos + (long) count) > this.pLength)
          throw new InvalidRangeException();
        this.pBaseStream.Write(buffer, offset, count);
        this.pInnerPos = checked (this.pInnerPos + (long) count);
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
    {
      try
      {
        if (this.pInnerPos < 0L)
          this.Position = 0L;
        if (this.pLength >= 0L && checked (this.pInnerPos + (long) count) > this.pLength)
          throw new ArgumentException();
        this.pLastCount = count;
        return this.pBaseStream.BeginWrite(buffer, offset, count, callback, RuntimeHelpers.GetObjectValue(state));
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    public override void EndWrite(IAsyncResult asyncResult)
    {
      try
      {
        this.pBaseStream.EndWrite(asyncResult);
        this.pInnerPos = checked (this.pInnerPos + (long) this.pLastCount);
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    public override void Flush()
    {
      try
      {
        this.pBaseStream.Flush();
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        this.pHasError = true;
        throw;
      }
    }

    protected override void Dispose(bool disposing)
    {
      try
      {
        if (!disposing || this.pDisposed)
          return;
        this.pDisposed = true;
        if (this.pHasError)
        {
          try
          {
            this.pBaseStream.Close();
          }
          catch (Exception ex)
          {
            ProjectData.SetProjectError(ex);
            ProjectData.ClearProjectError();
          }
        }
        else
        {
          if (this.pLength >= 0L && this.pInnerPos != this.pLength)
          {
            string message = "Length:" + this.pLength.ToString() + " Position:" + this.pInnerPos.ToString();
            try
            {
              this.pBaseStream.Close();
            }
            catch (Exception ex)
            {
              ProjectData.SetProjectError(ex);
              Exception innerexception = ex;
              throw new InvalidRangeException(message, innerexception);
            }
            throw new InvalidRangeException(message);
          }
          this.pBaseStream.Close();
        }
      }
      finally
      {
        base.Dispose(disposing);
      }
    }
  }
}