Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / HttpBufferlessInputStream.cs / 1305376 / HttpBufferlessInputStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * Bufferless Input stream used in response and uploaded file objects * * Copyright (c) 2009 Microsoft Corporation */ namespace System.Web { using System.IO; using System.Security; using System.Security.Permissions; using System.Web.Hosting; using System.Web.Configuration; using System.Web.Management; internal class HttpBufferlessInputStream : Stream { private long _CurrentPosition = 0; private long _Length = -1; private long _MaxRequestLength; private bool _PreloadedConsumed = false; private bool _MaxLengthRead = false; private HttpContext _Context; // private Stream _PreviousReadSteam; internal HttpBufferlessInputStream(HttpContext context /*, Stream previousReadSteam*/ ) { _Context = context; //_PreviousReadSteam = previousReadSteam; } ///////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////// public override bool CanRead { get { return true; } } public override bool CanSeek { get { return false; } } public override bool CanWrite { get { return false; } } public override long Length { get { //if (_PreviousReadSteam != null) // return _PreviousReadSteam.Length; if (_Length < 0) _Length = _Context.Request.ContentLength; return _Length; } } public override long Position { get { //if (_PreviousReadSteam != null) // return _PreviousReadSteam.Position; return _CurrentPosition; } set { throw new NotSupportedException(); } } public override void Flush() { } public override void SetLength(long length) { throw new NotSupportedException(); } public override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); } public override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); } ///////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////// public override int Read(byte[] buffer, int offset, int count) { //if (_PreviousReadSteam != null) // return _PreviousReadSteam.Read(buffer, offset, count); if (_Context.WorkerRequest == null || count == 0) return 0; if (buffer == null) throw new ArgumentNullException("buffer"); if (offset < 0 || offset + count > buffer.Length) throw new ArgumentException(null, "offset"); if (count < 0) throw new ArgumentException(null, "count"); int numBytesRead = 0; ////////////////////////////////////////////////////////////////// // Step 1: Check max-request-length for preloaded content if (!_MaxLengthRead) { _MaxRequestLength = RuntimeConfig.GetConfig(_Context).HttpRuntime.MaxRequestLengthBytes; if (Length > _MaxRequestLength) { if ( !(_Context.WorkerRequest is IIS7WorkerRequest) ) { _Context.Response.CloseConnectionAfterError(); } throw new HttpException(SR.GetString(SR.Max_request_length_exceeded), null, WebEventCodes.RuntimeErrorPostTooLarge); } _MaxLengthRead = true; } ////////////////////////////////////////////////////////////////// // Step 2: Consume preloaded content if (!_PreloadedConsumed) { // Get the preloaded content byte [] preloadedContent = _Context.WorkerRequest.GetPreloadedEntityBody(); if (preloadedContent != null) { // Figure out how much of the preloaded content we can use int preloadedRemaining = preloadedContent.Length - (int) _CurrentPosition; int bytesRead = Math.Min(count, preloadedRemaining); // Copy the preloaded content Buffer.BlockCopy(preloadedContent, (int) _CurrentPosition, buffer, offset, bytesRead); UpdateCounters(bytesRead, ref offset, ref count, ref numBytesRead); _PreloadedConsumed = (numBytesRead == preloadedRemaining); // did we use up all the preloaded content } else { _PreloadedConsumed = true; } } // We are done if the count == 0 or there is no more content if (count == 0 || _Context.WorkerRequest.IsEntireEntityBodyIsPreloaded()) return numBytesRead; ////////////////////////////////////////////////////////////////// // Step 4: Read entity body in a loop while (count > 0) { // Figure out how much to read long currentLimit = _MaxRequestLength - _CurrentPosition; // Number of bytes we can read before crossing the limit int bytesToRead = (int) Math.Min((long) Int32.MaxValue, Math.Min(count, currentLimit + 1)); // Read at-most 1 byte over the limit // Do the actual read int bytesRead = _Context.WorkerRequest.ReadEntityBody(buffer, offset, bytesToRead); if (bytesRead <= 0) { // nothing left to read if (!_Context.WorkerRequest.IsClientConnected()) throw new HttpException(SR.GetString(SR.ViewState_ClientDisconnected)); break; } UpdateCounters(bytesRead, ref offset, ref count, ref numBytesRead); } return numBytesRead; } ///////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////// // Helper function to increment variables in Read API private void UpdateCounters(int bytesRead, ref int offset, ref int count, ref int numBytesRead) { _Context.WorkerRequest.UpdateRequestCounters(bytesRead); count -= bytesRead; offset += bytesRead; _CurrentPosition += bytesRead; numBytesRead += bytesRead; if (_Length < _CurrentPosition) _Length = _CurrentPosition; if (Length > _MaxRequestLength) { if ( !(_Context.WorkerRequest is IIS7WorkerRequest) ) { _Context.Response.CloseConnectionAfterError(); } throw new HttpException(SR.GetString(SR.Max_request_length_exceeded), null, WebEventCodes.RuntimeErrorPostTooLarge); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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