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// $Id: ucs2_utf8.cpp,v 1.5 2002/07/01 00:09:54 hio Exp $
#include "Japanese.h"
/*
* ucs2=>utf8ʸ�����Ѵ�
*/
EXTERN_C
SV*
xs_ucs2_utf8(SV* sv_str)
{
if( sv_str==&PL_sv_undef )
{
return newSVpvn("",0);
}
STRLEN PL_na;
unsigned char* src = (unsigned char*)SvPV(sv_str,PL_na);
const int len = sv_len(sv_str);
//fprintf(stderr,"Unicode::Japanese::(xs)ucs2_utf8\n",len);
//bin_dump("in ",src,len);
SV_Buf result(len*3/2+4);
if( len&1 )
{
Perl_croak(aTHX_ "Unicode::Japanese::ucs2_utf8, invalid length (not 2*n)");
}
const unsigned char* src_end = src+(len&~1);
unsigned char buf[4];
for(; src<src_end; src+=2 )
{
const unsigned short ucs2 = ntohs(*(unsigned short*)src);
if( ucs2<0x80 )
{
buf[0] = (unsigned char)ucs2;
result.append(buf,1);
}else if( ucs2<0x800 )
{
buf[0] = 0xC0 | (ucs2 >> 6);
buf[1] = 0x80 | (ucs2 & 0x3F);
result.append(buf,2);
}else
{
buf[0] = 0xE0 | (ucs2 >> 12);
buf[1] = 0x80 | ((ucs2 >> 6) & 0x3F);
buf[2] = 0x80 | (ucs2 & 0x3F);
result.append(buf,3);
}
}
//bin_dump("out",result.getBegin(),result.getLength());
result.setLength();
return result.getSv();
}
/*
* utf8=>ucs2ʸ�����Ѵ�
*/
EXTERN_C
SV*
xs_utf8_ucs2(SV* sv_str)
{
if( sv_str==&PL_sv_undef )
{
return newSVpvn("",0);
}
STRLEN PL_na;
unsigned char* src = (unsigned char*)SvPV(sv_str,PL_na);
const int len = sv_len(sv_str);
//fprintf(stderr,"Unicode::Japanese::(xs)utf8_ucs2\n",len);
//bin_dump("in ",src,len);
SV_Buf result(len);
const unsigned char* src_end = src+len;
while( src<src_end )
{
if( *src<=0x7f )
{
result.append_ch2(htons(*src++));
continue;
}
int utf8_len,ucs2;
if( 0xc0<=*src && *src<=0xdf )
{ // length [2]
utf8_len = 2;
if( src+1>=src_end ||
src[1]<0x80 || 0xbf<src[1] )
{
result.append_ch2(htons(*src++));
continue;
}
ucs2 = ((src[0] & 0x1F)<<6)|(src[1] & 0x3F);
}else if( 0xe0<=*src && *src<=0xef )
{ // length [3]
utf8_len = 3;
if( src+2>=src_end ||
src[1]<0x80 || 0xbf<src[1] ||
src[2]<0x80 || 0xbf<src[2] )
{
result.append_ch2(htons(*src++));
continue;
}
ucs2 = ((src[0] & 0x0F)<<12)|((src[1] & 0x3F)<<6)|(src[2] & 0x3F);
}else if( 0xf0<=*src && *src<=0xf7 )
{ // length [4]
utf8_len = 4;
if( src+3>=src_end ||
src[1]<0x80 || 0xbf<src[1] ||
src[2]<0x80 || 0xbf<src[2] ||
src[3]<0x80 || 0xbf<src[3] )
{
result.append_ch2(htons(*src++));
continue;
}
ucs2 = ((src[0] & 0x07)<<18)|((src[1] & 0x3F)<<12)|
((src[2] & 0x3f) << 6)|(src[3] & 0x3F);
}else if( 0xf8<=*src && *src<=0xfb )
{ // length [5]
utf8_len = 5;
if( src+4>=src_end ||
src[1]<0x80 || 0xbf<src[1] ||
src[2]<0x80 || 0xbf<src[2] ||
src[3]<0x80 || 0xbf<src[3] ||
src[4]<0x80 || 0xbf<src[4] )
{
result.append_ch2(htons(*src++));
continue;
}
}else if( 0xfc<=*src && *src<=0xfd )
{ // length [6]
utf8_len = 6;
if( src+5>=src_end ||
src[1]<0x80 || 0xbf<src[1] ||
src[2]<0x80 || 0xbf<src[2] ||
src[3]<0x80 || 0xbf<src[3] ||
src[4]<0x80 || 0xbf<src[4] ||
src[5]<0x80 || 0xbf<src[5] )
{
result.append_ch2(htons(*src++));
continue;
}
}else
{ // invalid
result.append_ch2(htons(*src++));
continue;
}
if( ucs2 & ~0xFFFF )
{ // ucs2���ϰϳ� (ucs4���ϰ�)
result.append_ch2(htons('?'));
src += utf8_len;
continue;
}
result.append_ch2(htons(ucs2));
src += utf8_len;
//bin_dump("now",dst_begin,dst-dst_begin);
}
//bin_dump("out",result.getBegin(),result.getLength());
result.setLength();
return result.getSv();
}
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