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//
// I18N.CJK.DbcsEncoding
//
// Author:
// Alan Tam Siu Lung (Tam@SiuLung.com)
//
using System;
using System.Text;
using I18N.Common;
namespace I18N.CJK
{
[Serializable]
internal abstract class DbcsEncoding : MonoEncoding
{
public DbcsEncoding(int codePage) : base(codePage) {}
internal abstract DbcsConvert GetConvert ();
// Get the number of bytes needed to encode a character buffer.
public override int GetByteCount(char[] chars, int index, int count)
{
if (chars == null)
throw new ArgumentNullException("chars");
if (index < 0 || index > chars.Length)
throw new ArgumentOutOfRangeException("index", Strings.GetString("ArgRange_Array"));
if (count < 0 || index + count > chars.Length)
throw new ArgumentOutOfRangeException("count", Strings.GetString("ArgRange_Array"));
byte[] buffer = new byte[count * 2];
return GetBytes(chars, index, count, buffer, 0);
}
/*
// Get the bytes that result from encoding a character buffer.
public override int GetBytes(char[] chars, int charIndex, int charCount,
byte[] bytes, int byteIndex)
{
if (chars == null)
throw new ArgumentNullException("chars");
if (bytes == null)
throw new ArgumentNullException("bytes");
if (charIndex < 0 || charIndex > chars.Length)
throw new ArgumentOutOfRangeException("charIndex", Strings.GetString("ArgRange_Array"));
if (charCount < 0 || charIndex + charCount > chars.Length)
throw new ArgumentOutOfRangeException("charCount", Strings.GetString("ArgRange_Array"));
if (byteIndex < 0 || byteIndex > bytes.Length)
throw new ArgumentOutOfRangeException("byteIndex", Strings.GetString("ArgRange_Array"));
return 0; // For subclasses to implement
}
*/
// Get the number of characters needed to decode a byte buffer.
public override int GetCharCount(byte[] bytes, int index, int count)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (index < 0 || index > bytes.Length)
throw new ArgumentOutOfRangeException("index", Strings.GetString("ArgRange_Array"));
if (count < 0 || index + count > bytes.Length)
throw new ArgumentOutOfRangeException("count", Strings.GetString("ArgRange_Array"));
char[] buffer = new char[count];
return GetChars(bytes, index, count, buffer, 0);
}
// Get the characters that result from decoding a byte buffer.
public override int GetChars(byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (chars == null)
throw new ArgumentNullException("chars");
if (byteIndex < 0 || byteIndex > bytes.Length)
throw new ArgumentOutOfRangeException("byteIndex", Strings.GetString("ArgRange_Array"));
if (byteCount < 0 || byteIndex + byteCount > bytes.Length)
throw new ArgumentOutOfRangeException("byteCount", Strings.GetString("ArgRange_Array"));
if (charIndex < 0 || charIndex > chars.Length)
throw new ArgumentOutOfRangeException("charIndex", Strings.GetString("ArgRange_Array"));
return 0; // For subclasses to implement
}
// Get the maximum number of bytes needed to encode a
// specified number of characters.
public override int GetMaxByteCount(int charCount)
{
if (charCount < 0)
throw new ArgumentOutOfRangeException("charCount", Strings.GetString("ArgRange_NonNegative"));
return charCount * 2;
}
// Get the maximum number of characters needed to decode a
// specified number of bytes.
public override int GetMaxCharCount(int byteCount)
{
if (byteCount < 0) {
throw new ArgumentOutOfRangeException("byteCount", Strings.GetString("ArgRange_NonNegative"));
}
return byteCount;
}
// Get a decoder that handles a rolling state.
public override Decoder GetDecoder()
{
return new DbcsDecoder(GetConvert ());
}
// Determine if this encoding can be displayed in a Web browser.
public override bool IsBrowserDisplay
{
get { return true; }
}
// Determine if this encoding can be saved from a Web browser.
public override bool IsBrowserSave
{
get { return true; }
}
// Determine if this encoding can be displayed in a mail/news agent.
public override bool IsMailNewsDisplay
{
get { return true; }
}
// Determine if this encoding can be saved from a mail/news agent.
public override bool IsMailNewsSave
{
get { return true; }
}
// Decoder that handles a rolling state.
internal class DbcsDecoder : Decoder
{
protected DbcsConvert convert;
protected int lastByte;
// Constructor.
public DbcsDecoder(DbcsConvert convert)
{
this.convert = convert;
this.lastByte = 0;
}
// Override inherited methods.
public override int GetCharCount(byte[] bytes, int index, int count)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (index < 0 || index > bytes.Length)
throw new ArgumentOutOfRangeException("index", Strings.GetString("ArgRange_Array"));
if (count < 0 || count > (bytes.Length - index))
throw new ArgumentOutOfRangeException("count", Strings.GetString("ArgRange_Array"));
char[] buffer = new char[count * 2];
return GetChars(bytes, index, count, buffer, 0);
}
public override int GetChars(byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (chars == null)
throw new ArgumentNullException("chars");
if (byteIndex < 0 || byteIndex > bytes.Length)
throw new ArgumentOutOfRangeException("byteIndex", Strings.GetString("ArgRange_Array"));
if (byteCount < 0 || byteIndex + byteCount > bytes.Length)
throw new ArgumentOutOfRangeException("byteCount", Strings.GetString("ArgRange_Array"));
if (charIndex < 0 || charIndex > chars.Length)
throw new ArgumentOutOfRangeException("charIndex", Strings.GetString("ArgRange_Array"));
return 0; // For subclasses to implement
}
}
}
}
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