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//
// System.Text.Decoder.cs
//
// Authors:
// Dietmar Maurer (dietmar@ximian.com)
//
// (C) 2001 Ximian, Inc. http://www.ximian.com
//
namespace System.Text
{
[Serializable]
public abstract class Decoder
{
protected Decoder ()
{
// fixme: dont know what do do here
}
public abstract int GetCharCount (byte[] bytes, int index, int count);
public abstract int GetChars (byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex);
}
internal class DefaultDecoder : Decoder {
public Encoding encoding;
public DefaultDecoder (Encoding enc)
{
encoding = enc;
}
public override int GetCharCount (byte[] bytes, int index, int count)
{
return encoding.GetCharCount (bytes, index, count);
}
public override int GetChars (byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
return encoding.GetChars (bytes, byteIndex, byteCount, chars, charIndex);
}
}
internal class IConvDecoder : Decoder {
private IntPtr converter;
public IConvDecoder (string name, bool big_endian)
{
converter = Encoding.IConvNewDecoder (name, big_endian);
}
public override int GetCharCount (byte[] bytes, int index, int count)
{
if (bytes == null)
throw new ArgumentNullException ();
if (index + count > bytes.Length)
throw new ArgumentOutOfRangeException ();
return Encoding.IConvGetCharCount (converter, bytes, index, count);
}
public override int GetChars (byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
if ((bytes == null) || (chars == null))
throw new ArgumentNullException ();
if ((byteIndex < 0) || (byteCount < 0) || (charIndex < 0))
throw new ArgumentOutOfRangeException ();
if (byteIndex + byteCount > bytes.Length)
throw new ArgumentOutOfRangeException ();
if (charIndex > chars.Length)
throw new ArgumentOutOfRangeException ();
return Encoding.IConvGetChars (converter, bytes, byteIndex, byteCount,
chars, charIndex);
}
}
}
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