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PooledStringContent.cs
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PooledStringContent.cs
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using System;
using System.Buffers;
using System.Diagnostics;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
namespace Pooling.Net.Http
{
// This is essentially a copy of the StringContent
// sources in CoreFX, except modified to use ArrayPool
// instead of Encoding.GetBytes to avoid allocations
public class PooledStringContent : ByteArrayContent
{
private const string DefaultMediaType = "text/plain";
private byte[] _rented;
public PooledStringContent(string content)
: this(content, null, null)
{
}
public PooledStringContent(string content, Encoding encoding)
: this(content, encoding, null)
{
}
public PooledStringContent(string content, Encoding encoding, string mediaType)
: this(RentContentBuffer(content, encoding), encoding, mediaType)
{
}
private PooledStringContent(ArraySegment<byte> buffer, Encoding encoding, string mediaType)
: base(buffer.Array, buffer.Offset, buffer.Count)
{
Debug.Assert(buffer.Array != null);
_rented = buffer.Array;
// Initialize the 'Content-Type' header with information provided by parameters.
var headerValue = new MediaTypeHeaderValue(mediaType ?? DefaultMediaType);
headerValue.CharSet = (encoding ?? Encoding.UTF8).WebName;
Headers.ContentType = headerValue;
}
protected override void Dispose(bool disposing)
{
try
{
if (disposing)
{
if (_rented != null)
{
ArrayPool<byte>.Shared.Return(_rented);
_rented = null;
}
}
}
finally
{
base.Dispose(disposing);
}
}
private static ArraySegment<byte> RentContentBuffer(string content, Encoding encoding)
{
if (content == null)
{
throw new ArgumentNullException(nameof(content));
}
encoding = encoding ?? Encoding.UTF8;
int byteCount = encoding.GetByteCount(content);
var rented = ArrayPool<byte>.Shared.Rent(byteCount);
try
{
int written = encoding.GetBytes(content, 0, content.Length, rented, 0);
Debug.Assert(byteCount == written);
return new ArraySegment<byte>(rented, 0, written);
}
catch
{
// If something goes wrong return the array and rethrow
ArrayPool<byte>.Shared.Return(rented);
throw;
}
}
}
}