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//
// GB18030Encoding.cs
//
// Author:
// Atsushi Enomoto <atsushi@ximian.com>
//
using System;
using System.Reflection;
using System.Text;
using I18N.Common;
#if DISABLE_UNSAFE
using MonoEncoder = I18N.Common.MonoSafeEncoder;
using MonoEncoding = I18N.Common.MonoSafeEncoding;
#endif
namespace I18N.CJK
{
[Serializable]
internal class ENCgb18030 : GB18030Encoding
{
public ENCgb18030 (): base () {}
}
[Serializable]
public class CP54936 : GB18030Encoding { }
[Serializable]
public class GB18030Encoding : MonoEncoding
{
// Constructor.
public GB18030Encoding ()
: base (54936, 936)
{
}
public override string EncodingName {
get { return "Chinese Simplified (GB18030)"; }
}
public override string HeaderName {
get { return "GB18030"; }
}
public override string BodyName {
get { return "GB18030"; }
}
public override string WebName {
get { return "GB18030"; }
}
public override bool IsMailNewsDisplay {
get { return true; }
}
public override bool IsMailNewsSave {
get { return true; }
}
public override bool IsBrowserDisplay {
get { return true; }
}
public override bool IsBrowserSave {
get { return true; }
}
public override int GetMaxByteCount (int len)
{
// non-GB2312 characters in \u0080 - \uFFFF
return len * 4;
}
public override int GetMaxCharCount (int len)
{
return len;
}
#if !DISABLE_UNSAFE
public unsafe override int GetByteCountImpl (char* chars, int count)
{
return new GB18030Encoder (this).GetByteCountImpl (chars, count, true);
}
public unsafe override int GetBytesImpl (char* chars, int charCount, byte* bytes, int byteCount)
{
return new GB18030Encoder (this).GetBytesImpl (chars, charCount, bytes, byteCount, true);
}
#else
public override int GetByteCount (char [] chars, int index, int length)
{
return new GB18030Encoder (this).GetByteCount (chars, index, length, true);
}
public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
{
return new GB18030Encoder (this).GetBytes (chars, charIndex, charCount, bytes, byteIndex, true);
}
#endif
public override int GetCharCount (byte [] bytes, int start, int len)
{
return new GB18030Decoder ().GetCharCount (bytes, start, len);
}
public override int GetChars (byte [] bytes, int byteIdx, int srclen, char [] chars, int charIdx)
{
return new GB18030Decoder ().GetChars (bytes, byteIdx, srclen, chars, charIdx);
}
public override Encoder GetEncoder ()
{
return new GB18030Encoder (this);
}
public override Decoder GetDecoder ()
{
return new GB18030Decoder ();
}
}
class GB18030Decoder : DbcsEncoding.DbcsDecoder
{
static DbcsConvert gb2312 = DbcsConvert.Gb2312;
// for now incomplete block is not supported - should we?
// int incomplete1 = -1, incomplete2 = -1, incomplete3 = -1;
public GB18030Decoder ()
: base (null)
{
}
public override int GetCharCount (byte [] bytes, int start, int len)
{
CheckRange (bytes, start, len);
int end = start + len;
int ret = 0;
while (start < end) {
if (bytes [start] < 0x80) {
ret++;
start++;
continue;
}
else if (bytes [start] == 0x80) {
// Euro sign - actually it is obsolete,
// now it's just reserved but not used
ret++;
start++;
continue;
}
else if (bytes [start] == 0xFF) {
// invalid data - fill '?'
ret++;
start++;
continue;
}
else if (start + 1 >= end) {
// incomplete1 = bytes [start];
// incomplete2 = -1;
// incomplete3 = -1;
ret++;
break; // incomplete tail.
}
byte second = bytes [start + 1];
if (second == 0x7F || second == 0xFF) {
// invalid data
ret++;
start += 2;
continue;
}
else if (0x30 <= second && second <= 0x39) {
// UCS mapping
if (start + 3 >= end) {
// incomplete tail.
// incomplete1 = bytes [start];
// incomplete2 = bytes [start + 1];
// if (start + 3 == end)
// incomplete3 = bytes [start + 2];
ret += start + 3 == end ? 3 : 2;
break;
}
long value = GB18030Source.FromGBX (bytes, start);
if (value < 0) {
// invalid data.
ret++;
start -= (int) value;
} else if (value >= 0x10000) {
// UTF16 surrogate
ret += 2;
start += 4;
} else {
// UTF16 BMP
ret++;
start+= 4;
}
} else {
// GB2312 mapping
start += 2;
ret++;
}
}
return ret;
}
public override int GetChars (byte [] bytes, int byteIndex, int byteCount, char [] chars, int charIndex)
{
CheckRange (bytes, byteIndex, byteCount, chars, charIndex);
int byteEnd = byteIndex + byteCount;
int charStart = charIndex;
while (byteIndex < byteEnd) {
if (bytes [byteIndex] < 0x80) {
chars [charIndex++] = (char) bytes [byteIndex++];
continue;
}
else if (bytes [byteIndex] == 0x80) {
// Euro sign - actually it is obsolete,
// now it's just reserved but not used
chars [charIndex++] = '\u20AC';
byteIndex++;
continue;
}
else if (bytes [byteIndex] == 0xFF) {
// invalid data - fill '?'
chars [charIndex++] = '?';
byteIndex++;
continue;
}
else if (byteIndex + 1 >= byteEnd) {
//incomplete1 = bytes [byteIndex++];
//incomplete2 = -1;
//incomplete3 = -1;
break; // incomplete tail.
}
byte second = bytes [byteIndex + 1];
if (second == 0x7F || second == 0xFF) {
// invalid data
chars [charIndex++] = '?';
byteIndex += 2;
}
else if (0x30 <= second && second <= 0x39) {
// UCS mapping
if (byteIndex + 3 >= byteEnd) {
// incomplete tail.
//incomplete1 = bytes [byteIndex];
//incomplete2 = bytes [byteIndex + 1];
//if (byteIndex + 3 == byteEnd)
// incomplete3 = bytes [byteIndex + 2];
break;
}
long value = GB18030Source.FromGBX (bytes, byteIndex);
if (value < 0) {
// invalid data.
chars [charIndex++] = '?';
byteIndex -= (int) value;
} else if (value >= 0x10000) {
// UTF16 surrogate
value -= 0x10000;
chars [charIndex++] = (char) (value / 0x400 + 0xD800);
chars [charIndex++] = (char) (value % 0x400 + 0xDC00);
byteIndex += 4;
} else {
// UTF16 BMP
chars [charIndex++] = (char) value;
byteIndex += 4;
}
} else {
byte first = bytes [byteIndex];
int ord = ((first - 0x81) * 191 + second - 0x40) * 2;
char c1 = ord < 0 || ord >= gb2312.n2u.Length ?
'\0' : (char) (gb2312.n2u [ord] + gb2312.n2u [ord + 1] * 256);
if (c1 == 0)
chars [charIndex++] = '?';
else
chars [charIndex++] = c1;
byteIndex += 2;
}
}
return charIndex - charStart;
}
}
class GB18030Encoder : MonoEncoder
{
static DbcsConvert gb2312 = DbcsConvert.Gb2312;
public GB18030Encoder (MonoEncoding owner)
: base (owner)
{
}
char incomplete_byte_count;
char incomplete_bytes;
#if !DISABLE_UNSAFE
public unsafe override int GetByteCountImpl (char* chars, int count, bool refresh)
{
int start = 0;
int end = count;
int ret = 0;
while (start < end) {
char ch = chars [start];
if (ch < 0x80) {
// ASCII
ret++;
start++;
continue;
} else if (Char.IsSurrogate (ch)) {
// Surrogate
if (start + 1 == end) {
incomplete_byte_count = ch;
start++;
} else {
ret += 4;
start += 2;
}
continue;
}
if (ch < 0x80 || ch == 0xFF) {
// ASCII
ret++;
start++;
continue;
}
byte b1 = gb2312.u2n [((int) ch) * 2 + 1];
byte b2 = gb2312.u2n [((int) ch) * 2];
if (b1 != 0 && b2 != 0) {
// GB2312
ret += 2;
start++;
continue;
}
// non-GB2312
long value = GB18030Source.FromUCS (ch);
if (value < 0)
ret++; // invalid(?)
else
ret += 4;
start++;
}
if (refresh) {
if (incomplete_byte_count != char.MinValue)
ret++;
incomplete_byte_count = char.MinValue;
}
return ret;
}
public unsafe override int GetBytesImpl (char* chars, int charCount, byte* bytes, int byteCount, bool refresh)
{
int charIndex = 0;
int byteIndex = 0;
int charEnd = charIndex + charCount;
int byteStart = byteIndex;
char ch = incomplete_bytes;
while (charIndex < charEnd) {
if (incomplete_bytes == char.MinValue)
ch = chars [charIndex++];
else
incomplete_bytes = char.MinValue;
if (ch < 0x80) {
// ASCII
bytes [byteIndex++] = (byte) ch;
continue;
} else if (Char.IsSurrogate (ch)) {
// Surrogate
if (charIndex == charEnd) {
incomplete_bytes = ch;
break; // incomplete
}
char ch2 = chars [charIndex++];
if (!Char.IsSurrogate (ch2)) {
// invalid surrogate
HandleFallback (
chars, ref charIndex, ref charCount,
bytes, ref byteIndex, ref byteCount, null);
continue;
}
int cp = (ch - 0xD800) * 0x400 + ch2 - 0xDC00;
GB18030Source.Unlinear (bytes + byteIndex, GB18030Source.FromUCSSurrogate (cp));
byteIndex += 4;
continue;
}
if (ch <= 0x80 || ch == 0xFF) {
// Character maps to itself
bytes [byteIndex++] = (byte) ch;
continue;
}
byte b1 = gb2312.u2n [((int) ch) * 2 + 1];
byte b2 = gb2312.u2n [((int) ch) * 2];
if (b1 != 0 && b2 != 0) {
bytes [byteIndex++] = b1;
bytes [byteIndex++] = b2;
continue;
}
long value = GB18030Source.FromUCS (ch);
if (value < 0)
bytes [byteIndex++] = 0x3F; // invalid(?)
else {
// non-GB2312
GB18030Source.Unlinear (bytes + byteIndex, value);
byteIndex += 4;
}
}
if (refresh) {
if (incomplete_bytes != char.MinValue)
bytes [byteIndex++] = 0x3F; // incomplete
incomplete_bytes = char.MinValue;
}
return byteIndex - byteStart;
}
#else
public override int GetByteCount(char[] chars, int start, int count, bool refresh)
{
int end = start + count;
int ret = 0;
while (start < end)
{
char ch = chars[start];
if (ch < 0x80)
{
// ASCII
ret++;
start++;
continue;
}
else if (Char.IsSurrogate(ch))
{
// Surrogate
if (start + 1 == end)
{
incomplete_byte_count = ch;
start++;
}
else
{
ret += 4;
start += 2;
}
continue;
}
if (ch < 0x80 || ch == 0xFF)
{
// ASCII
ret++;
start++;
continue;
}
byte b1 = gb2312.u2n[((int)ch) * 2 + 1];
byte b2 = gb2312.u2n[((int)ch) * 2];
if (b1 != 0 && b2 != 0)
{
// GB2312
ret += 2;
start++;
continue;
}
// non-GB2312
long value = GB18030Source.FromUCS(ch);
if (value < 0)
ret++; // invalid(?)
else
ret += 4;
start++;
}
if (refresh)
{
if (incomplete_byte_count != char.MinValue)
ret++;
incomplete_byte_count = char.MinValue;
}
return ret;
}
public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex, bool refresh)
{
int byteCount = bytes.Length;
int charEnd = charIndex + charCount;
int byteStart = byteIndex;
char ch = incomplete_bytes;
while (charIndex < charEnd)
{
if (incomplete_bytes == char.MinValue)
ch = chars[charIndex++];
else
incomplete_bytes = char.MinValue;
if (ch < 0x80)
{
// ASCII
bytes[byteIndex++] = (byte)ch;
continue;
}
else if (Char.IsSurrogate(ch))
{
// Surrogate
if (charIndex == charEnd)
{
incomplete_bytes = ch;
break; // incomplete
}
char ch2 = chars[charIndex++];
if (!Char.IsSurrogate(ch2))
{
// invalid surrogate
HandleFallback (chars, ref charIndex, ref charCount,
bytes, ref byteIndex, ref byteCount, null);
continue;
}
int cp = (ch - 0xD800) * 0x400 + ch2 - 0xDC00;
GB18030Source.Unlinear(bytes, byteIndex, GB18030Source.FromUCSSurrogate(cp));
byteIndex += 4;
continue;
}
if (ch <= 0x80 || ch == 0xFF)
{
// Character maps to itself
bytes[byteIndex++] = (byte)ch;
continue;
}
byte b1 = gb2312.u2n[((int)ch) * 2 + 1];
byte b2 = gb2312.u2n[((int)ch) * 2];
if (b1 != 0 && b2 != 0)
{
bytes[byteIndex++] = b1;
bytes[byteIndex++] = b2;
continue;
}
long value = GB18030Source.FromUCS(ch);
if (value < 0)
bytes[byteIndex++] = 0x3F; // invalid(?)
else
{
// non-GB2312
GB18030Source.Unlinear(bytes, byteIndex, value);
byteIndex += 4;
}
}
if (refresh)
{
if (incomplete_bytes != char.MinValue)
bytes[byteIndex++] = 0x3F; // incomplete
incomplete_bytes = char.MinValue;
}
return byteIndex - byteStart;
}
#endif
}
}
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