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);
}
public unsafe override int GetByteCountImpl(char *chars, int charCount, bool refresh)
{
int end = charCount;
int start = 0;
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);
}
