jellyfin/SocketHttpListener/Net/ChunkStream.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
namespace SocketHttpListener.Net
{
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// Licensed to the .NET Foundation under one or more agreements.
// See the LICENSE file in the project root for more information.
//
// System.Net.ResponseStream
//
// Author:
// Gonzalo Paniagua Javier (gonzalo@novell.com)
//
// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
internal sealed class ChunkStream
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{
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private enum State
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{
None,
PartialSize,
Body,
BodyFinished,
Trailer
}
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private class Chunk
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{
public byte[] Bytes;
public int Offset;
public Chunk(byte[] chunk)
{
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Bytes = chunk;
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}
public int Read(byte[] buffer, int offset, int size)
{
int nread = (size > Bytes.Length - Offset) ? Bytes.Length - Offset : size;
Buffer.BlockCopy(Bytes, Offset, buffer, offset, nread);
Offset += nread;
return nread;
}
}
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internal WebHeaderCollection _headers;
private int _chunkSize;
private int _chunkRead;
private int _totalWritten;
private State _state;
private StringBuilder _saved;
private bool _sawCR;
private bool _gotit;
private int _trailerState;
private List<Chunk> _chunks;
public ChunkStream(byte[] buffer, int offset, int size, WebHeaderCollection headers)
: this(headers)
{
Write(buffer, offset, size);
}
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public ChunkStream(WebHeaderCollection headers)
{
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_headers = headers;
_saved = new StringBuilder();
_chunks = new List<Chunk>();
_chunkSize = -1;
_totalWritten = 0;
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}
public void ResetBuffer()
{
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_chunkSize = -1;
_chunkRead = 0;
_totalWritten = 0;
_chunks.Clear();
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}
public void WriteAndReadBack(byte[] buffer, int offset, int size, ref int read)
{
if (offset + read > 0)
Write(buffer, offset, offset + read);
read = Read(buffer, offset, size);
}
public int Read(byte[] buffer, int offset, int size)
{
return ReadFromChunks(buffer, offset, size);
}
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private int ReadFromChunks(byte[] buffer, int offset, int size)
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{
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int count = _chunks.Count;
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int nread = 0;
var chunksForRemoving = new List<Chunk>(count);
for (int i = 0; i < count; i++)
{
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Chunk chunk = _chunks[i];
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if (chunk.Offset == chunk.Bytes.Length)
{
chunksForRemoving.Add(chunk);
continue;
}
nread += chunk.Read(buffer, offset + nread, size - nread);
if (nread == size)
break;
}
foreach (var chunk in chunksForRemoving)
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_chunks.Remove(chunk);
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return nread;
}
public void Write(byte[] buffer, int offset, int size)
{
if (offset < size)
InternalWrite(buffer, ref offset, size);
}
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private void InternalWrite(byte[] buffer, ref int offset, int size)
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{
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if (_state == State.None || _state == State.PartialSize)
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{
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_state = GetChunkSize(buffer, ref offset, size);
if (_state == State.PartialSize)
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return;
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_saved.Length = 0;
_sawCR = false;
_gotit = false;
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}
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if (_state == State.Body && offset < size)
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{
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_state = ReadBody(buffer, ref offset, size);
if (_state == State.Body)
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return;
}
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if (_state == State.BodyFinished && offset < size)
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{
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_state = ReadCRLF(buffer, ref offset, size);
if (_state == State.BodyFinished)
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return;
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_sawCR = false;
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}
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if (_state == State.Trailer && offset < size)
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{
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_state = ReadTrailer(buffer, ref offset, size);
if (_state == State.Trailer)
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return;
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_saved.Length = 0;
_sawCR = false;
_gotit = false;
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}
if (offset < size)
InternalWrite(buffer, ref offset, size);
}
public bool WantMore
{
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get { return (_chunkRead != _chunkSize || _chunkSize != 0 || _state != State.None); }
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}
public bool DataAvailable
{
get
{
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int count = _chunks.Count;
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for (int i = 0; i < count; i++)
{
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Chunk ch = _chunks[i];
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if (ch == null || ch.Bytes == null)
continue;
if (ch.Bytes.Length > 0 && ch.Offset < ch.Bytes.Length)
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return (_state != State.Body);
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}
return false;
}
}
public int TotalDataSize
{
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get { return _totalWritten; }
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}
public int ChunkLeft
{
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get { return _chunkSize - _chunkRead; }
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}
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private State ReadBody(byte[] buffer, ref int offset, int size)
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{
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if (_chunkSize == 0)
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return State.BodyFinished;
int diff = size - offset;
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if (diff + _chunkRead > _chunkSize)
diff = _chunkSize - _chunkRead;
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byte[] chunk = new byte[diff];
Buffer.BlockCopy(buffer, offset, chunk, 0, diff);
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_chunks.Add(new Chunk(chunk));
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offset += diff;
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_chunkRead += diff;
_totalWritten += diff;
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return (_chunkRead == _chunkSize) ? State.BodyFinished : State.Body;
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}
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private State GetChunkSize(byte[] buffer, ref int offset, int size)
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{
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_chunkRead = 0;
_chunkSize = 0;
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char c = '\0';
while (offset < size)
{
c = (char)buffer[offset++];
if (c == '\r')
{
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if (_sawCR)
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ThrowProtocolViolation("2 CR found");
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_sawCR = true;
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continue;
}
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if (_sawCR && c == '\n')
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break;
if (c == ' ')
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_gotit = true;
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if (!_gotit)
_saved.Append(c);
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if (_saved.Length > 20)
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ThrowProtocolViolation("chunk size too long.");
}
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if (!_sawCR || c != '\n')
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{
if (offset < size)
ThrowProtocolViolation("Missing \\n");
try
{
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if (_saved.Length > 0)
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{
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_chunkSize = Int32.Parse(RemoveChunkExtension(_saved.ToString()), NumberStyles.HexNumber);
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}
}
catch (Exception)
{
ThrowProtocolViolation("Cannot parse chunk size.");
}
return State.PartialSize;
}
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_chunkRead = 0;
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try
{
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_chunkSize = Int32.Parse(RemoveChunkExtension(_saved.ToString()), NumberStyles.HexNumber);
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}
catch (Exception)
{
ThrowProtocolViolation("Cannot parse chunk size.");
}
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if (_chunkSize == 0)
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{
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_trailerState = 2;
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return State.Trailer;
}
return State.Body;
}
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private static string RemoveChunkExtension(string input)
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{
int idx = input.IndexOf(';');
if (idx == -1)
return input;
return input.Substring(0, idx);
}
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private State ReadCRLF(byte[] buffer, ref int offset, int size)
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{
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if (!_sawCR)
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{
if ((char)buffer[offset++] != '\r')
ThrowProtocolViolation("Expecting \\r");
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_sawCR = true;
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if (offset == size)
return State.BodyFinished;
}
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if (_sawCR && (char)buffer[offset++] != '\n')
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ThrowProtocolViolation("Expecting \\n");
return State.None;
}
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private State ReadTrailer(byte[] buffer, ref int offset, int size)
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{
char c = '\0';
// short path
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if (_trailerState == 2 && (char)buffer[offset] == '\r' && _saved.Length == 0)
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{
offset++;
if (offset < size && (char)buffer[offset] == '\n')
{
offset++;
return State.None;
}
offset--;
}
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int st = _trailerState;
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string stString = "\r\n\r";
while (offset < size && st < 4)
{
c = (char)buffer[offset++];
if ((st == 0 || st == 2) && c == '\r')
{
st++;
continue;
}
if ((st == 1 || st == 3) && c == '\n')
{
st++;
continue;
}
if (st > 0)
{
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_saved.Append(stString.Substring(0, _saved.Length == 0 ? st - 2 : st));
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st = 0;
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if (_saved.Length > 4196)
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ThrowProtocolViolation("Error reading trailer (too long).");
}
}
if (st < 4)
{
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_trailerState = st;
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if (offset < size)
ThrowProtocolViolation("Error reading trailer.");
return State.Trailer;
}
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StringReader reader = new StringReader(_saved.ToString());
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string line;
while ((line = reader.ReadLine()) != null && line != "")
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_headers.Add(line);
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return State.None;
}
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private static void ThrowProtocolViolation(string message)
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{
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WebException we = new WebException(message, null, WebExceptionStatus.ServerProtocolViolation, null);
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throw we;
}
}
}