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//
// System.Text.EncodingDecoder.cs
//
// Authors:
// Marcos Henrich (marcos.henrich@xamarin.com)
//
// Copyright (C) 2014 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;
using System.Runtime.InteropServices;
namespace System.Text {
abstract class EncodingDecoder : Decoder {
protected readonly Encoding encoding;
// Constructor.
protected EncodingDecoder (Encoding encoding)
{
this.encoding = encoding;
var fallback = encoding.DecoderFallback;
if (fallback != null)
Fallback = fallback;
}
public unsafe override void Convert (
byte* bytes, int byteCount,
char* chars, int charCount, bool flush,
out int bytesUsed, out int charsUsed, out bool completed)
{
if (chars == null)
throw new ArgumentNullException ("chars");
if (bytes == null)
throw new ArgumentNullException ("bytes");
if (charCount < 0)
throw new ArgumentOutOfRangeException ("charCount");
if (byteCount < 0)
throw new ArgumentOutOfRangeException ("byteCount");
bytesUsed = encoding.GetByteCount(chars, charCount);
if (bytesUsed > byteCount) {
charsUsed = encoding.GetChars (bytes, byteCount, chars, charCount);
bytesUsed = encoding.GetByteCount (chars, charsUsed);
} else
charsUsed = encoding.GetChars (bytes, bytesUsed, chars, charCount);
completed = bytesUsed == byteCount;
}
public override void Convert (
byte [] bytes, int byteIndex, int byteCount,
char [] chars, int charIndex, int charCount, bool flush,
out int bytesUsed, out int charsUsed, out bool completed)
{
if (chars == null)
throw new ArgumentNullException ("chars");
if (bytes == null)
throw new ArgumentNullException ("bytes");
if (charIndex < 0)
throw new ArgumentOutOfRangeException ("charIndex");
if (charCount < 0 || chars.Length < charIndex + charCount)
throw new ArgumentOutOfRangeException ("charCount");
if (byteIndex < 0)
throw new ArgumentOutOfRangeException ("byteIndex");
if (byteCount < 0 || bytes.Length < byteIndex + byteCount)
throw new ArgumentOutOfRangeException ("byteCount");
bytesUsed = encoding.GetByteCount(chars, charIndex, charCount);
if (bytesUsed > byteCount) {
charsUsed = encoding.GetChars (bytes, byteIndex, byteCount, chars, charIndex);
bytesUsed = encoding.GetByteCount (chars, charIndex, charsUsed);
} else
charsUsed = encoding.GetChars (bytes, byteIndex, bytesUsed, chars, charIndex);
completed = bytesUsed == byteCount;
}
}; // class EncodingDecoder
}; // namespace System.Text
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