NS_IMETHODIMP nsGB2312ToUnicodeV2::ConvertNoBuff(const char* aSrc,
PRInt32 * aSrcLength,
PRUnichar *aDest,
PRInt32 * aDestLength)
{
PRInt32 i=0;
PRInt32 iSrcLength = (*aSrcLength);
PRInt32 iDestlen = 0;
nsresult rv = NS_OK;
for (i=0;i<iSrcLength;i++)
{
if ( iDestlen >= (*aDestLength) )
{
rv = NS_OK_UDEC_MOREOUTPUT;
break;
}
if(UINT8_IN_RANGE(0xa1, *aSrc, 0xfe))
{
if(i+1 >= iSrcLength)
{
rv = NS_OK_UDEC_MOREINPUT;
break;
}
// To make sure, the second byte has to be checked as well
// The valid 2nd byte range: [0xA1,0xFE]
if(UINT8_IN_RANGE(0xa1, aSrc[1], 0xfe))
{
// Valid GB 2312 code point
*aDest = mUtil.GBKCharToUnicode(aSrc[0], aSrc[1]);
aSrc += 2;
i++;
} else {
// Invalid GB 2312 code point
*aDest = UCS2_NO_MAPPING;
aSrc++;
}
} else {
if(IS_ASCII(*aSrc))
{
// The source is an ASCII
*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
} else {
*aDest = UCS2_NO_MAPPING;
}
aSrc++;
}
iDestlen++;
aDest++;
*aSrcLength = i+1;
}
*aDestLength = iDestlen;
return rv;
}
NS_IMETHODIMP nsGBKToUnicode::ConvertNoBuff(const char* aSrc,
int32_t * aSrcLength,
char16_t *aDest,
int32_t * aDestLength)
{
int32_t i=0;
int32_t iSrcLength = (*aSrcLength);
int32_t iDestlen = 0;
nsresult rv=NS_OK;
*aSrcLength = 0;
for (i=0;i<iSrcLength;i++)
{
if ( iDestlen >= (*aDestLength) )
{
rv = NS_OK_UDEC_MOREOUTPUT;
break;
}
// The valid range for the 1st byte is [0x81,0xFE]
if(LEGAL_GBK_MULTIBYTE_FIRST_BYTE(*aSrc))
{
if(i+1 >= iSrcLength)
{
rv = NS_OK_UDEC_MOREINPUT;
break;
}
// To make sure, the second byte has to be checked as well.
// In GBK, the second byte range is [0x40,0x7E] and [0x80,0XFE]
if(LEGAL_GBK_2BYTE_SECOND_BYTE(aSrc[1]))
{
// Valid GBK code
*aDest = mUtil.GBKCharToUnicode(aSrc[0], aSrc[1]);
if(UCS2_NO_MAPPING == *aDest)
{
// We cannot map in the common mapping, let's call the
// delegate 2 byte decoder to decode the gbk or gb18030 unique
// 2 byte mapping
if(! TryExtensionDecoder(aSrc, aDest))
{
*aDest = UCS2_NO_MAPPING;
}
}
aSrc += 2;
i++;
}
else if (LEGAL_GBK_4BYTE_SECOND_BYTE(aSrc[1]))
{
// from the first 2 bytes, it looks like a 4 byte GB18030
if(i+3 >= iSrcLength) // make sure we got 4 bytes
{
rv = NS_OK_UDEC_MOREINPUT;
break;
}
// 4 bytes patten
// [0x81-0xfe][0x30-0x39][0x81-0xfe][0x30-0x39]
// preset the
if (LEGAL_GBK_4BYTE_THIRD_BYTE(aSrc[2]) &&
LEGAL_GBK_4BYTE_FORTH_BYTE(aSrc[3]))
{
if ( ! FIRST_BYTE_IS_SURROGATE(aSrc[0]))
{
// let's call the delegated 4 byte gb18030 converter to convert it
if(! Try4BytesDecoder(aSrc, aDest))
*aDest = UCS2_NO_MAPPING;
} else {
// let's try supplement mapping
if ( (iDestlen+1) < (*aDestLength) )
{
if(DecodeToSurrogate(aSrc, aDest))
{
// surrogte two char16_t
iDestlen++;
aDest++;
} else {
*aDest = UCS2_NO_MAPPING;
}
} else {
if (*aDestLength < 2) {
NS_ERROR("insufficient space in output buffer");
*aDest = UCS2_NO_MAPPING;
} else {
rv = NS_OK_UDEC_MOREOUTPUT;
break;
}
}
}
aSrc += 4;
i += 3;
} else {
*aDest = UCS2_NO_MAPPING;
// If the third and fourth bytes are not in the legal ranges for
// a four-byte sequnce, resynchronize on the second byte
// (which we know is in the range of LEGAL_GBK_4BYTE_SECOND_BYTE,
// 0x30-0x39)
aSrc++;
}
}
else if ((uint8_t) aSrc[0] == (uint8_t)0xA0 )
{
// stand-alone (not followed by a valid second byte) 0xA0 !
// treat it as valid a la Netscape 4.x
*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
aSrc++;
} else {
// Invalid GBK code point (second byte should be 0x40 or higher)
*aDest = UCS2_NO_MAPPING;
aSrc++;
}
} else {
if(IS_ASCII(*aSrc))
{
// The source is an ASCII
*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
aSrc++;
} else {
if(IS_GBK_EURO(*aSrc)) {
*aDest = UCS2_EURO;
} else {
*aDest = UCS2_NO_MAPPING;
}
aSrc++;
}
}
iDestlen++;
aDest++;
*aSrcLength = i+1;
}
*aDestLength = iDestlen;
return rv;
}
