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//
// TlsMultiBuffer.cs
//
// Author:
// Martin Baulig <martin.baulig@xamarin.com>
//
// Copyright (c) 2014-2016 Xamarin Inc. (http://www.xamarin.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.
using System;
namespace Mono.Security.Interface
{
public class TlsMultiBuffer
{
MemoryChunk first, last;
private class MemoryChunk : BufferOffsetSize
{
public MemoryChunk next;
public MemoryChunk (byte[] buffer, int offset, int size)
: base (buffer, offset, size)
{
}
}
public bool IsEmpty {
get { return first == null; }
}
public bool IsSingle {
get { return first != null && first.next == null; }
}
public void Add (TlsBuffer buffer)
{
Add (buffer.Buffer, buffer.Offset, buffer.Size);
}
public void Add (byte[] buffer)
{
Add (buffer, 0, buffer.Length);
}
public void Add (byte[] buffer, int offset, int size)
{
var chunk = new MemoryChunk (buffer, offset, size);
if (last == null)
first = last = chunk;
else {
last.next = chunk;
last = chunk;
}
}
public BufferOffsetSize[] GetBufferArray ()
{
int count = 0;
for (var ptr = first; ptr != null; ptr = ptr.next)
count++;
var array = new BufferOffsetSize [count];
count = 0;
for (var ptr = first; ptr != null; ptr = ptr.next)
array [count++] = ptr;
return array;
}
public void Clear ()
{
for (var ptr = first; ptr != null; ptr = ptr.next)
ptr.Dispose ();
first = last = null;
}
public BufferOffsetSize GetBuffer ()
{
int totalSize = 0;
for (var ptr = first; ptr != null; ptr = ptr.next)
totalSize += ptr.Size;
var outBuffer = new BufferOffsetSize (new byte [totalSize]);
int offset = 0;
for (var ptr = first; ptr != null; ptr = ptr.next) {
Buffer.BlockCopy (ptr.Buffer, ptr.Offset, outBuffer.Buffer, offset, ptr.Size);
offset += ptr.Size;
}
return outBuffer;
}
public BufferOffsetSize StealBuffer ()
{
if (IsSingle) {
var retval = first;
first = last = null;
return retval;
}
return GetBuffer ();
}
}
}
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