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HttpMultipart.cs
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HttpMultipart.cs
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using System;
namespace Nancy
{
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
/// <summary>
/// Retrieves <see cref="HttpMultipartBoundary"/> instances from a request stream.
/// </summary>
public class HttpMultipart
{
private const byte LF = (byte)'\n';
private readonly byte[] boundaryAsBytes;
private readonly HttpMultipartBuffer readBuffer;
private readonly Stream requestStream;
private readonly byte[] closingBoundaryAsBytes;
/// <summary>
/// Initializes a new instance of the <see cref="HttpMultipart"/> class.
/// </summary>
/// <param name="requestStream">The request stream to parse.</param>
/// <param name="boundary">The boundary marker to look for.</param>
public HttpMultipart(Stream requestStream, string boundary)
{
this.requestStream = requestStream;
this.boundaryAsBytes = GetBoundaryAsBytes(boundary, false);
this.closingBoundaryAsBytes = GetBoundaryAsBytes(boundary, true);
this.readBuffer = new HttpMultipartBuffer(this.boundaryAsBytes, this.closingBoundaryAsBytes);
}
/// <summary>
/// Gets the <see cref="HttpMultipartBoundary"/> instances from the request stream.
/// </summary>
/// <returns>An <see cref="IEnumerable{T}"/> instance, containing the found <see cref="HttpMultipartBoundary"/> instances.</returns>
public IEnumerable<HttpMultipartBoundary> GetBoundaries()
{
return
(from boundaryStream in this.GetBoundarySubStreams()
select new HttpMultipartBoundary(boundaryStream)).ToList();
}
private IEnumerable<HttpMultipartSubStream> GetBoundarySubStreams()
{
var boundarySubStreams = new List<HttpMultipartSubStream>();
var boundaryStart = this.GetNextBoundaryPosition();
var found = 0;
while (MultipartIsNotCompleted(boundaryStart) && found < StaticConfiguration.RequestQueryFormMultipartLimit)
{
var boundaryEnd = this.GetNextBoundaryPosition();
boundarySubStreams.Add(new HttpMultipartSubStream(
this.requestStream,
boundaryStart,
this.GetActualEndOfBoundary(boundaryEnd)));
boundaryStart = boundaryEnd;
found++;
}
return boundarySubStreams;
}
private bool MultipartIsNotCompleted(long boundaryPosition)
{
return boundaryPosition > -1 && !this.readBuffer.IsClosingBoundary;
}
//we add two because or the \r\n before the boundary
private long GetActualEndOfBoundary(long boundaryEnd)
{
if (this.CheckIfFoundEndOfStream())
{
return this.requestStream.Position - (this.readBuffer.Length + 2);
}
return boundaryEnd - (this.readBuffer.Length + 2);
}
private bool CheckIfFoundEndOfStream()
{
return this.requestStream.Position.Equals(this.requestStream.Length);
}
private static byte[] GetBoundaryAsBytes(string boundary, bool closing)
{
var boundaryBuilder = new StringBuilder();
boundaryBuilder.Append("--");
boundaryBuilder.Append(boundary);
if(closing)
{
boundaryBuilder.Append("--");
}
else
{
boundaryBuilder.Append('\r');
boundaryBuilder.Append('\n');
}
var bytes =
Encoding.ASCII.GetBytes(boundaryBuilder.ToString());
return bytes;
}
private long GetNextBoundaryPosition()
{
this.readBuffer.Reset();
while(true)
{
var byteReadFromStream = this.requestStream.ReadByte();
if (byteReadFromStream == -1)
{
return -1;
}
this.readBuffer.Insert((byte)byteReadFromStream);
if (this.readBuffer.IsFull && (this.readBuffer.IsBoundary || this.readBuffer.IsClosingBoundary))
{
return this.requestStream.Position;
}
if (byteReadFromStream.Equals(LF) || this.readBuffer.IsFull)
{
this.readBuffer.Reset();
}
}
}
}
}