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/*
$Id: Unicode.xs,v 1.3 2002/04/20 23:43:47 dankogai Exp $
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#define U8 U8
#include "../Encode/encode.h"
#define FBCHAR 0xFFFd
#define BOM_BE 0xFeFF
#define BOM16LE 0xFFFe
#define BOM32LE 0xFFFe0000
#define issurrogate(x) (0xD800 <= (x) && (x) <= 0xDFFF )
#define isHiSurrogate(x) (0xD800 <= (x) && (x) < 0xDC00 )
#define isLoSurrogate(x) (0xDC00 <= (x) && (x) <= 0xDFFF )
#define invalid_ucs2(x) ( issurrogate(x) || 0xFFFF < (x) )
static UV
enc_unpack(pTHX_ U8 **sp,U8 *e,STRLEN size,U8 endian)
{
U8 *s = *sp;
UV v = 0;
if (s+size > e) {
croak("Partial character %c",(char) endian);
}
switch(endian) {
case 'N':
v = *s++;
v = (v << 8) | *s++;
case 'n':
v = (v << 8) | *s++;
v = (v << 8) | *s++;
break;
case 'V':
case 'v':
v |= *s++;
v |= (*s++ << 8);
if (endian == 'v')
break;
v |= (*s++ << 16);
v |= (*s++ << 24);
break;
default:
croak("Unknown endian %c",(char) endian);
break;
}
*sp = s;
return v;
}
void
enc_pack(pTHX_ SV *result,STRLEN size,U8 endian,UV value)
{
U8 *d = (U8 *)SvGROW(result,SvCUR(result)+size);
switch(endian) {
case 'v':
case 'V':
d += SvCUR(result);
SvCUR_set(result,SvCUR(result)+size);
while (size--) {
*d++ = value & 0xFF;
value >>= 8;
}
break;
case 'n':
case 'N':
SvCUR_set(result,SvCUR(result)+size);
d += SvCUR(result);
while (size--) {
*--d = value & 0xFF;
value >>= 8;
}
break;
default:
croak("Unknown endian %c",(char) endian);
break;
}
}
MODULE = Encode::Unicode PACKAGE = Encode::Unicode
PROTOTYPES: DISABLE
void
decode_xs(obj, str, check = 0)
SV * obj
SV * str
IV check
CODE:
{
int size = SvIV(*hv_fetch((HV *)SvRV(obj),"size",4,0));
U8 endian = *((U8 *)SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"endian",6,0)));
int ucs2 = SvTRUE(*hv_fetch((HV *)SvRV(obj),"ucs2",4,0));
SV *result = newSVpvn("",0);
STRLEN ulen;
U8 *s = (U8 *)SvPVbyte(str,ulen);
U8 *e = (U8 *)SvEND(str);
ST(0) = sv_2mortal(result);
SvUTF8_on(result);
if (!endian && s+size <= e) {
UV bom;
endian = (size == 4) ? 'N' : 'n';
bom = enc_unpack(aTHX_ &s,e,size,endian);
if (bom != BOM_BE) {
if (bom == BOM16LE) {
endian = 'v';
}
else if (bom == BOM32LE) {
endian = 'V';
}
else {
croak("%s:Unregognised BOM %"UVxf,
SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)),
bom);
}
}
#if 0
/* Update endian for this sequence */
hv_store((HV *)SvRV(obj),"endian",6,newSVpv((char *)&endian,1),0);
#endif
}
while (s < e && s+size <= e) {
UV ord = enc_unpack(aTHX_ &s,e,size,endian);
U8 *d;
if (size != 4 && invalid_ucs2(ord)) {
if (ucs2) {
if (check) {
croak("%s:no surrogates allowed %"UVxf,
SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)),
ord);
}
if (s+size <= e) {
/* skip the next one as well */
enc_unpack(aTHX_ &s,e,size,endian);
}
ord = FBCHAR;
}
else {
UV lo;
if (!isHiSurrogate(ord)) {
croak("%s:Malformed HI surrogate %"UVxf,
SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)),
ord);
}
if (s+size > e) {
/* Partial character */
s -= size; /* back up to 1st half */
break; /* And exit loop */
}
lo = enc_unpack(aTHX_ &s,e,size,endian);
if (!isLoSurrogate(lo)){
croak("%s:Malformed LO surrogate %"UVxf,
SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)),
ord);
}
ord = 0x10000 + ((ord - 0xD800) << 10) + (lo - 0xDC00);
}
}
d = (U8 *) SvGROW(result,SvCUR(result)+UTF8_MAXLEN+1);
d = uvuni_to_utf8_flags(d+SvCUR(result), ord, 0);
SvCUR_set(result,d - (U8 *)SvPVX(result));
}
if (s < e) {
Perl_warner(aTHX_ packWARN(WARN_UTF8),"%s:Partial character",
SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)));
}
if (check && !(check & ENCODE_LEAVE_SRC)){
if (s < e) {
Move(s,SvPVX(str),e-s,U8);
SvCUR_set(str,(e-s));
}
else {
SvCUR_set(str,0);
}
*SvEND(str) = '\0';
}
XSRETURN(1);
}
void
encode_xs(obj, utf8, check = 0)
SV * obj
SV * utf8
IV check
CODE:
{
int size = SvIV(*hv_fetch((HV *)SvRV(obj),"size",4,0));
U8 endian = *((U8 *)SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"endian",6,0)));
int ucs2 = SvTRUE(*hv_fetch((HV *)SvRV(obj),"ucs2",4,0));
SV *result = newSVpvn("",0);
STRLEN ulen;
U8 *s = (U8 *)SvPVutf8(utf8,ulen);
U8 *e = (U8 *)SvEND(utf8);
ST(0) = sv_2mortal(result);
if (!endian) {
endian = (size == 4) ? 'N' : 'n';
enc_pack(aTHX_ result,size,endian,BOM_BE);
#if 0
/* Update endian for this sequence */
hv_store((HV *)SvRV(obj),"endian",6,newSVpv((char *)&endian,1),0);
#endif
}
while (s < e && s+UTF8SKIP(s) <= e) {
STRLEN len;
UV ord = utf8n_to_uvuni(s, e-s, &len, 0);
s += len;
if (size != 4 && invalid_ucs2(ord)) {
if (!issurrogate(ord)){
if (ucs2) {
if (check) {
croak("%s:code point \"\\x{"UVxf"}\" too high",
SvPV_nolen(
*hv_fetch((HV *)SvRV(obj),"Name",4,0))
,ord);
}
enc_pack(aTHX_ result,size,endian,FBCHAR);
}else{
UV hi = ((ord - 0x10000) >> 10) + 0xD800;
UV lo = ((ord - 0x10000) & 0x3FF) + 0xDC00;
enc_pack(aTHX_ result,size,endian,hi);
enc_pack(aTHX_ result,size,endian,lo);
}
}
else {
/* not supposed to happen */
enc_pack(aTHX_ result,size,endian,FBCHAR);
}
}
else {
enc_pack(aTHX_ result,size,endian,ord);
}
}
if (s < e) {
Perl_warner(aTHX_ packWARN(WARN_UTF8),"%s:Partial character",
SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)));
}
if (check && !(check & ENCODE_LEAVE_SRC)){
if (s < e) {
Move(s,SvPVX(utf8),e-s,U8);
SvCUR_set(utf8,(e-s));
}
else {
SvCUR_set(utf8,0);
}
*SvEND(utf8) = '\0';
}
XSRETURN(1);
}
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