using System;
using System.IO;
using System.Runtime.InteropServices;

namespace System.Net
{
	// Token: 0x02000250 RID: 592
	internal class RequestStream : Stream
	{
		// Token: 0x060014F2 RID: 5362 RVA: 0x00042FF8 File Offset: 0x000411F8
		internal RequestStream(Stream stream, byte[] buffer, int offset, int length)
			: this(stream, buffer, offset, length, -1L)
		{
		}

		// Token: 0x060014F3 RID: 5363 RVA: 0x00043008 File Offset: 0x00041208
		internal RequestStream(Stream stream, byte[] buffer, int offset, int length, long contentlength)
		{
			this.stream = stream;
			this.buffer = buffer;
			this.offset = offset;
			this.length = length;
			this.remaining_body = contentlength;
		}

		// Token: 0x170006D7 RID: 1751
		// (get) Token: 0x060014F4 RID: 5364 RVA: 0x00043038 File Offset: 0x00041238
		public override bool CanRead
		{
			get
			{
				return true;
			}
		}

		// Token: 0x170006D8 RID: 1752
		// (get) Token: 0x060014F5 RID: 5365 RVA: 0x0004303C File Offset: 0x0004123C
		public override bool CanSeek
		{
			get
			{
				return false;
			}
		}

		// Token: 0x170006D9 RID: 1753
		// (get) Token: 0x060014F6 RID: 5366 RVA: 0x00043040 File Offset: 0x00041240
		public override bool CanWrite
		{
			get
			{
				return false;
			}
		}

		// Token: 0x170006DA RID: 1754
		// (get) Token: 0x060014F7 RID: 5367 RVA: 0x00043044 File Offset: 0x00041244
		public override long Length
		{
			get
			{
				throw new NotSupportedException();
			}
		}

		// Token: 0x170006DB RID: 1755
		// (get) Token: 0x060014F8 RID: 5368 RVA: 0x0004304C File Offset: 0x0004124C
		// (set) Token: 0x060014F9 RID: 5369 RVA: 0x00043054 File Offset: 0x00041254
		public override long Position
		{
			get
			{
				throw new NotSupportedException();
			}
			set
			{
				throw new NotSupportedException();
			}
		}

		// Token: 0x060014FA RID: 5370 RVA: 0x0004305C File Offset: 0x0004125C
		public override void Close()
		{
			this.disposed = true;
		}

		// Token: 0x060014FB RID: 5371 RVA: 0x00043068 File Offset: 0x00041268
		public override void Flush()
		{
		}

		// Token: 0x060014FC RID: 5372 RVA: 0x0004306C File Offset: 0x0004126C
		private int FillFromBuffer(byte[] buffer, int off, int count)
		{
			if (buffer == null)
			{
				throw new ArgumentNullException("buffer");
			}
			if (off < 0)
			{
				throw new ArgumentOutOfRangeException("offset", "< 0");
			}
			if (count < 0)
			{
				throw new ArgumentOutOfRangeException("count", "< 0");
			}
			int num = buffer.Length;
			if (off > num)
			{
				throw new ArgumentException("destination offset is beyond array size");
			}
			if (off > num - count)
			{
				throw new ArgumentException("Reading would overrun buffer");
			}
			if (this.remaining_body == 0L)
			{
				return -1;
			}
			if (this.length == 0)
			{
				return 0;
			}
			int num2 = Math.Min(this.length, count);
			if (this.remaining_body > 0L)
			{
				num2 = (int)Math.Min((long)num2, this.remaining_body);
			}
			if (this.offset > this.buffer.Length - num2)
			{
				num2 = Math.Min(num2, this.buffer.Length - this.offset);
			}
			if (num2 == 0)
			{
				return 0;
			}
			Buffer.BlockCopy(this.buffer, this.offset, buffer, off, num2);
			this.offset += num2;
			this.length -= num2;
			if (this.remaining_body > 0L)
			{
				this.remaining_body -= (long)num2;
			}
			return num2;
		}

		// Token: 0x060014FD RID: 5373 RVA: 0x000431A8 File Offset: 0x000413A8
		public override int Read([In] [Out] byte[] buffer, int offset, int count)
		{
			if (this.disposed)
			{
				throw new ObjectDisposedException(typeof(RequestStream).ToString());
			}
			int num = this.FillFromBuffer(buffer, offset, count);
			if (num == -1)
			{
				return 0;
			}
			if (num > 0)
			{
				return num;
			}
			num = this.stream.Read(buffer, offset, count);
			if (num > 0 && this.remaining_body > 0L)
			{
				this.remaining_body -= (long)num;
			}
			return num;
		}

		// Token: 0x060014FE RID: 5374 RVA: 0x00043224 File Offset: 0x00041424
		public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback cback, object state)
		{
			if (this.disposed)
			{
				throw new ObjectDisposedException(typeof(RequestStream).ToString());
			}
			int num = this.FillFromBuffer(buffer, offset, count);
			if (num > 0 || num == -1)
			{
				HttpStreamAsyncResult httpStreamAsyncResult = new HttpStreamAsyncResult();
				httpStreamAsyncResult.Buffer = buffer;
				httpStreamAsyncResult.Offset = offset;
				httpStreamAsyncResult.Count = count;
				httpStreamAsyncResult.Callback = cback;
				httpStreamAsyncResult.State = state;
				httpStreamAsyncResult.SynchRead = num;
				httpStreamAsyncResult.Complete();
				return httpStreamAsyncResult;
			}
			if (this.remaining_body >= 0L && (long)count > this.remaining_body)
			{
				count = (int)Math.Min(2147483647L, this.remaining_body);
			}
			return this.stream.BeginRead(buffer, offset, count, cback, state);
		}

		// Token: 0x060014FF RID: 5375 RVA: 0x000432E4 File Offset: 0x000414E4
		public override int EndRead(IAsyncResult ares)
		{
			if (this.disposed)
			{
				throw new ObjectDisposedException(typeof(RequestStream).ToString());
			}
			if (ares == null)
			{
				throw new ArgumentNullException("async_result");
			}
			if (ares is HttpStreamAsyncResult)
			{
				HttpStreamAsyncResult httpStreamAsyncResult = (HttpStreamAsyncResult)ares;
				if (!ares.IsCompleted)
				{
					ares.AsyncWaitHandle.WaitOne();
				}
				return httpStreamAsyncResult.SynchRead;
			}
			int num = this.stream.EndRead(ares);
			if (this.remaining_body > 0L && num > 0)
			{
				this.remaining_body -= (long)num;
			}
			return num;
		}

		// Token: 0x06001500 RID: 5376 RVA: 0x00043384 File Offset: 0x00041584
		public override long Seek(long offset, SeekOrigin origin)
		{
			throw new NotSupportedException();
		}

		// Token: 0x06001501 RID: 5377 RVA: 0x0004338C File Offset: 0x0004158C
		public override void SetLength(long value)
		{
			throw new NotSupportedException();
		}

		// Token: 0x06001502 RID: 5378 RVA: 0x00043394 File Offset: 0x00041594
		public override void Write(byte[] buffer, int offset, int count)
		{
			throw new NotSupportedException();
		}

		// Token: 0x06001503 RID: 5379 RVA: 0x0004339C File Offset: 0x0004159C
		public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback cback, object state)
		{
			throw new NotSupportedException();
		}

		// Token: 0x06001504 RID: 5380 RVA: 0x000433A4 File Offset: 0x000415A4
		public override void EndWrite(IAsyncResult async_result)
		{
			throw new NotSupportedException();
		}

		// Token: 0x0400119F RID: 4511
		private byte[] buffer;

		// Token: 0x040011A0 RID: 4512
		private int offset;

		// Token: 0x040011A1 RID: 4513
		private int length;

		// Token: 0x040011A2 RID: 4514
		private long remaining_body;

		// Token: 0x040011A3 RID: 4515
		private bool disposed;

		// Token: 0x040011A4 RID: 4516
		private Stream stream;
	}
}