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//
// I18N.CJK.CP949
//
// Author:
// Hye-Shik Chang (perky@FreeBSD.org)
//
using System;
using System.Text;
using I18N.Common;
namespace I18N.CJK
{
[Serializable]
internal class CP949 : KoreanEncoding
{
// Magic number used by Windows for the UHC code page.
private const int UHC_CODE_PAGE = 949;
// Constructor.
public CP949 () : base (UHC_CODE_PAGE, true)
{
}
// Get the mail body name for this encoding.
public override String BodyName
{
get { return "ks_c_5601-1987"; }
}
// Get the human-readable name for this encoding.
public override String EncodingName
{
get { return "Korean (UHC)"; }
}
// Get the mail agent header name for this encoding.
public override String HeaderName
{
get { return "ks_c_5601-1987"; }
}
// Get the IANA-preferred Web name for this encoding.
public override String WebName
{
get { return "ks_c_5601-1987"; }
}
/*
// Get the Windows code page represented by this object.
public override int WindowsCodePage
{
get { return UHC_PAGE; }
}
*/
}
[Serializable]
internal class CP51949 : KoreanEncoding
{
// Magic number used by Windows for the euc-kr code page.
private const int EUCKR_CODE_PAGE = 51949;
// Constructor.
public CP51949 () : base (EUCKR_CODE_PAGE, false)
{
}
// Get the mail body name for this encoding.
public override String BodyName
{
get { return "euc-kr"; }
}
// Get the human-readable name for this encoding.
public override String EncodingName
{
get { return "Korean (EUC)"; }
}
// Get the mail agent header name for this encoding.
public override String HeaderName
{
get { return "euc-kr"; }
}
// Get the IANA-preferred Web name for this encoding.
public override String WebName
{
get { return "euc-kr"; }
}
/*
// Get the Windows code page represented by this object.
public override int WindowsCodePage
{
get { return UHC_PAGE; }
}
*/
}
[Serializable]
internal class KoreanEncoding : DbcsEncoding
{
// Constructor.
public KoreanEncoding (int codepage, bool useUHC) : base (codepage) {
this.useUHC = useUHC;
}
internal override DbcsConvert GetConvert ()
{
return KSConvert.Convert;
}
bool useUHC;
// Get the bytes that result from encoding a character buffer.
public unsafe override int GetBytesImpl (char* chars, int charCount,
byte* bytes, int byteCount)
{
int charIndex = 0;
int byteIndex = 0;
DbcsConvert convert = GetConvert ();
#if NET_2_0
EncoderFallbackBuffer buffer = null;
#endif
// 00 00 - FF FF
int origIndex = byteIndex;
while (charCount-- > 0) {
char c = chars[charIndex++];
if (c <= 0x80 || c == 0xFF) { // ASCII
bytes[byteIndex++] = (byte)c;
continue;
}
byte b1 = convert.u2n[((int)c) * 2];
byte b2 = convert.u2n[((int)c) * 2 + 1];
if (b1 == 0 && b2 == 0) {
#if NET_2_0
HandleFallback (ref buffer, chars, ref charIndex, ref charCount,
bytes, ref byteIndex, ref byteCount);
#else
bytes[byteIndex++] = (byte)'?';
#endif
} else {
bytes[byteIndex++] = b1;
bytes[byteIndex++] = b2;
}
}
return byteIndex - origIndex;
}
// Get the characters that result from decoding a byte buffer.
public override int GetChars(byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
DbcsConvert convert = GetConvert ();
base.GetChars(bytes, byteIndex, byteCount, chars, charIndex);
int origIndex = charIndex;
int lastByte = 0;
while (byteCount-- > 0) {
int b = bytes[byteIndex++];
if (lastByte == 0) {
if (b <= 0x80 || b == 0xFF) { // ASCII
chars[charIndex++] = (char)b;
continue;
} else {
lastByte = b;
continue;
}
}
char c1;
if (useUHC && lastByte < 0xa1) { // UHC Level 1
int ord = 8836 + (lastByte - 0x81) * 178;
if (b >= 0x41 && b <= 0x5A)
ord += b - 0x41;
else if (b >= 0x61 && b <= 0x7A)
ord += b - 0x61 + 26;
else if (b >= 0x81 && b <= 0xFE)
ord += b - 0x81 + 52;
else
ord = -1;
if (ord >= 0 && ord * 2 <= convert.n2u.Length)
c1 = (char)(convert.n2u[ord*2] +
convert.n2u[ord*2 + 1] * 256);
else
c1 = (char)0;
} else if (useUHC && lastByte <= 0xC6 && b < 0xa1) { // UHC Level 2
int ord = 14532 + (lastByte - 0xA1) * 84;
if (b >= 0x41 && b <= 0x5A)
ord += b - 0x41;
else if (b >= 0x61 && b <= 0x7A)
ord += b - 0x61 + 26;
else if (b >= 0x81 && b <= 0xA0)
ord += b - 0x81 + 52;
else
ord = -1;
if (ord >= 0 && ord * 2 < convert.n2u.Length)
c1 = (char)(convert.n2u[ord*2] +
convert.n2u[ord*2 + 1] * 256);
else
c1 = (char)0;
} else if (b >= 0xA1 && b <= 0xFE) { // KS X 1001
int ord = ((lastByte - 0xA1) * 94 + b - 0xA1) * 2;
c1 = ord < 0 || ord >= convert.n2u.Length ?
'\0' : (char)(convert.n2u[ord] +
convert.n2u[ord + 1] * 256);
} else
c1 = (char)0;
if (c1 == 0)
chars[charIndex++] = '?';
else
chars[charIndex++] = c1;
lastByte = 0;
}
return charIndex - origIndex;
}
// Get a decoder that handles a rolling UHC state.
public override Decoder GetDecoder()
{
return new KoreanDecoder (GetConvert (), useUHC);
}
// Decoder that handles a rolling UHC state.
private sealed class KoreanDecoder : DbcsDecoder
{
// Constructor.
public KoreanDecoder (DbcsConvert convert, bool useUHC)
: base(convert)
{
this.useUHC = useUHC;
}
bool useUHC;
public override int GetChars(byte[] bytes, int byteIndex,
int byteCount, char[] chars, int charIndex)
{
base.GetChars(bytes, byteIndex, byteCount, chars, charIndex);
int origIndex = charIndex;
while (byteCount-- > 0) {
int b = bytes[byteIndex++];
if (lastByte == 0) {
if (b <= 0x80 || b == 0xFF) { // ASCII
chars[charIndex++] = (char)b;
continue;
} else {
lastByte = b;
continue;
}
}
char c1;
if (useUHC && lastByte < 0xa1) { // UHC Level 1
int ord = 8836 + (lastByte - 0x81) * 178;
if (b >= 0x41 && b <= 0x5A)
ord += b - 0x41;
else if (b >= 0x61 && b <= 0x7A)
ord += b - 0x61 + 26;
else if (b >= 0x81 && b <= 0xFE)
ord += b - 0x81 + 52;
else
ord = -1;
if (ord >= 0 && ord * 2 <= convert.n2u.Length)
c1 = (char)(convert.n2u[ord*2] +
convert.n2u[ord*2 + 1] * 256);
else
c1 = (char)0;
} else if (useUHC && lastByte <= 0xC6 && b < 0xA1) { // UHC Level 2
int ord = 14532 + (lastByte - 0xA1) * 84;
if (b >= 0x41 && b <= 0x5A)
ord += b - 0x41;
else if (b >= 0x61 && b <= 0x7A)
ord += b - 0x61 + 26;
else if (b >= 0x81 && b <= 0xA0)
ord += b - 0x81 + 52;
else
ord = -1;
if (ord >= 0 && ord * 2 <= convert.n2u.Length)
c1 = (char)(convert.n2u[ord*2] +
convert.n2u[ord*2 + 1] * 256);
else
c1 = (char)0;
} else if (b >= 0xA1 && b <= 0xFE) { // KS X 1001
int ord = ((lastByte - 0xA1) * 94 + b - 0xA1) * 2;
c1 = ord < 0 || ord >= convert.n2u.Length ?
'\0' : (char)(convert.n2u[ord] +
convert.n2u[ord + 1] * 256);
} else
c1 = (char)0;
if (c1 == 0)
chars[charIndex++] = '?';
else
chars[charIndex++] = c1;
lastByte = 0;
}
return charIndex - origIndex;
}
}
}
[Serializable]
internal class ENCuhc : CP949
{
public ENCuhc() {}
}
[Serializable]
internal class ENCeuc_kr: CP51949
{
public ENCeuc_kr() {}
}
}
// ex: ts=8 sts=4 et
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