static int
text_is_extended(u_char c)
{
if (c >= 128)
return (1);
return (text_is_ascii(c));
}
static int
text_is_latin1(u_char c)
{
if (c >= 160)
return (1);
return (text_is_ascii(c));
}
int qr_code_data_list_extract_text(const qr_code_data_list *_qrlist,
zbar_image_scanner_t *iscn,
zbar_image_t *img)
{
#if HAVE_ICONV
iconv_t sjis_cd;
iconv_t utf8_cd;
iconv_t latin1_cd;
#endif
const qr_code_data *qrdata;
int nqrdata;
unsigned char *mark;
int ntext;
int i;
qrdata=_qrlist->qrdata;
nqrdata=_qrlist->nqrdata;
mark=(unsigned char *)calloc(nqrdata,sizeof(*mark));
ntext=0;
#if HAVE_ICONV
/*This is the encoding the standard says is the default.*/
latin1_cd=iconv_open("UTF-8","ISO8859-1");
/*But this one is often used, as well.*/
sjis_cd=iconv_open("UTF-8","SJIS");
/*This is a trivial conversion just to check validity without extra code.*/
utf8_cd=iconv_open("UTF-8","UTF-8");
#endif
for(i=0;i<nqrdata;i++)if(!mark[i]){
const qr_code_data *qrdataj;
const qr_code_data_entry *entry;
#if HAVE_ICONV
iconv_t enc_list[3];
iconv_t eci_cd;
#endif
int sa[16];
int sa_size;
char *sa_text;
size_t sa_ntext;
size_t sa_ctext;
int fnc1;
int eci;
int err;
int j;
int k;
/*Step 0: Collect the other QR codes belonging to this S-A group.*/
if(qrdata[i].sa_size){
unsigned sa_parity;
sa_size=qrdata[i].sa_size;
sa_parity=qrdata[i].sa_parity;
for(j=0;j<sa_size;j++)sa[j]=-1;
for(j=i;j<nqrdata;j++)if(!mark[j]){
/*TODO: We could also match version, ECC level, etc. if size and
parity alone are too ambiguous.*/
if(qrdata[j].sa_size==sa_size&&qrdata[j].sa_parity==sa_parity&&
sa[qrdata[j].sa_index]<0){
sa[qrdata[j].sa_index]=j;
mark[j]=1;
}
}
/*TODO: If the S-A group is complete, check the parity.*/
}
else{
sa[0]=i;
sa_size=1;
}
sa_ctext=0;
fnc1=0;
/*Step 1: Detect FNC1 markers and estimate the required buffer size.*/
for(j=0;j<sa_size;j++)if(sa[j]>=0){
qrdataj=qrdata+sa[j];
for(k=0;k<qrdataj->nentries;k++){
int shift;
entry=qrdataj->entries+k;
shift=0;
switch(entry->mode){
/*FNC1 applies to the entire code and ignores subsequent markers.*/
case QR_MODE_FNC1_1ST:
case QR_MODE_FNC1_2ND:fnc1=1;break;
/*2 SJIS bytes will be at most 4 UTF-8 bytes.*/
case QR_MODE_KANJI:shift++;
/*We assume at most 4 UTF-8 bytes per input byte.
I believe this is true for all the encodings we actually use.*/
case QR_MODE_BYTE:shift++;
default:{
/*The remaining two modes are already valid UTF-8.*/
if(QR_MODE_HAS_DATA(entry->mode)){
sa_ctext+=entry->payload.data.len<<shift;
}
}break;
}
}
}
/*Step 2: Convert the entries.*/
sa_text=(char *)malloc((sa_ctext+1)*sizeof(*sa_text));
sa_ntext=0;
eci=-1;
#if HAVE_ICONV
enc_list[0]=sjis_cd;
enc_list[1]=latin1_cd;
enc_list[2]=utf8_cd;
eci_cd=(iconv_t)-1;
#endif
err=0;
zbar_symbol_t *syms = NULL, **sym = &syms;
for(j = 0; j < sa_size && !err; j++, sym = &(*sym)->next) {
*sym = _zbar_image_scanner_alloc_sym(iscn, ZBAR_QRCODE, 0);
(*sym)->datalen = sa_ntext;
if(sa[j]<0){
/* generic placeholder for unfinished results */
(*sym)->type = ZBAR_PARTIAL;
/*Skip all contiguous missing segments.*/
for(j++;j<sa_size&&sa[j]<0;j++);
/*If there aren't any more, stop.*/
if(j>=sa_size)break;
/* mark break in data */
sa_text[sa_ntext++]='\0';
(*sym)->datalen = sa_ntext;
/* advance to next symbol */
sym = &(*sym)->next;
*sym = _zbar_image_scanner_alloc_sym(iscn, ZBAR_QRCODE, 0);
}
qrdataj=qrdata+sa[j];
/* expose bounding box */
sym_add_point(*sym, qrdataj->bbox[0][0], qrdataj->bbox[0][1]);
sym_add_point(*sym, qrdataj->bbox[2][0], qrdataj->bbox[2][1]);
sym_add_point(*sym, qrdataj->bbox[3][0], qrdataj->bbox[3][1]);
sym_add_point(*sym, qrdataj->bbox[1][0], qrdataj->bbox[1][1]);
printf("Decoding %i symbols.\n", qrdataj->nentries);
for(k=0;k<qrdataj->nentries&&!err;k++){
size_t inleft;
char *in;
size_t outleft;
char *out;
entry=qrdataj->entries+k;
printf("Symbol %i mode: %i\n", k, entry->mode);
switch(entry->mode){
case QR_MODE_NUM:{
if(sa_ctext-sa_ntext>=(size_t)entry->payload.data.len){
memcpy(sa_text+sa_ntext,entry->payload.data.buf,
entry->payload.data.len*sizeof(*sa_text));
sa_ntext+=entry->payload.data.len;
}
else err=1;
}break;
case QR_MODE_ALNUM:{
char *p;
in=(char *)entry->payload.data.buf;
inleft=entry->payload.data.len;
/*FNC1 uses '%' as an escape character.*/
if(fnc1)for(;;){
size_t plen;
char c;
p=memchr(in,'%',inleft*sizeof(*in));
if(p==NULL)break;
plen=p-in;
if(sa_ctext-sa_ntext<plen+1)break;
memcpy(sa_text+sa_ntext,in,plen*sizeof(*in));
sa_ntext+=plen;
/*Two '%'s is a literal '%'*/
if(plen+1<inleft&&p[1]=='%'){
c='%';
plen++;
p++;
}
/*One '%' is the ASCII group separator.*/
else c=0x1D;
sa_text[sa_ntext++]=c;
inleft-=plen+1;
in=p+1;
}
else p=NULL;
if(p!=NULL||sa_ctext-sa_ntext<inleft)err=1;
else{
memcpy(sa_text+sa_ntext,in,inleft*sizeof(*sa_text));
sa_ntext+=inleft;
}
}break;
/*TODO: This will not handle a multi-byte sequence split between
multiple data blocks.
Does such a thing occur?
Is it allowed?
It requires copying buffers around to handle correctly.*/
case QR_MODE_BYTE:{
in=(char *)entry->payload.data.buf;
inleft=entry->payload.data.len;
#if !HAVE_ICONV
out=sa_text+sa_ntext;
outleft=sa_ctext-sa_ntext;
strncpy(out, in, inleft);
sa_ntext+=inleft;
printf("Copied %u bytes.\n", (unsigned)inleft);
#else
out=sa_text+sa_ntext;
outleft=sa_ctext-sa_ntext;
/*If we have no specified encoding, attempt to auto-detect it.*/
if(eci<0){
int ei;
/*First check for the UTF-8 BOM.*/
if(inleft>=3&&
in[0]==(char)0xEF&&in[1]==(char)0xBB&&in[2]==(char)0xBF){
in+=3;
inleft-=3;
/*Actually try converting (to check validity).*/
err=utf8_cd==(iconv_t)-1||
iconv(utf8_cd,&in,&inleft,&out,&outleft)==(size_t)-1;
if(!err){
sa_ntext=out-sa_text;
enc_list_mtf(enc_list,utf8_cd);
continue;
}
in=(char *)entry->payload.data.buf;
inleft=entry->payload.data.len;
out=sa_text+sa_ntext;
outleft=sa_ctext-sa_ntext;
}
/*If the text is 8-bit clean, prefer UTF-8 over SJIS, since SJIS
will corrupt the backslashes used for DoCoMo formats.*/
else if(text_is_ascii((unsigned char *)in,inleft)){
enc_list_mtf(enc_list,utf8_cd);
}
/*Try our list of encodings.*/
for(ei=0;ei<3;ei++)if(enc_list[ei]!=(iconv_t)-1){
/*According to the standard, ISO/IEC 8859-1 (one hyphen) is
supposed to be used, but reality is not always so.
It's got an invalid range that is used often with SJIS
and UTF-8, though, which makes detection easier.
However, iconv() does not properly reject characters in
those ranges, since ISO-8859-1 (two hyphens) defines a
number of seldom-used control code characters there.
So if we see any of those characters, move this
conversion to the end of the list.*/
if(ei<2&&enc_list[ei]==latin1_cd&&
!text_is_latin1((unsigned char *)in,inleft)){
int ej;
for(ej=ei+1;ej<3;ej++)enc_list[ej-1]=enc_list[ej];
enc_list[2]=latin1_cd;
}
err=iconv(enc_list[ei],&in,&inleft,&out,&outleft)==(size_t)-1;
if(!err){
sa_ntext=out-sa_text;
enc_list_mtf(enc_list,enc_list[ei]);
break;
}
in=(char *)entry->payload.data.buf;
inleft=entry->payload.data.len;
out=sa_text+sa_ntext;
outleft=sa_ctext-sa_ntext;
}
}
/*We were actually given a character set; use it.*/
else{
err=eci_cd==(iconv_t)-1||
iconv(eci_cd,&in,&inleft,&out,&outleft)==(size_t)-1;
if(!err)sa_ntext=out-sa_text;
}
#endif
}break;
/*Kanji mode always uses SJIS.*/
case QR_MODE_KANJI:{
in=(char *)entry->payload.data.buf;
inleft=entry->payload.data.len;
#if HAVE_ICONV
out=sa_text+sa_ntext;
outleft=sa_ctext-sa_ntext;
err=sjis_cd==(iconv_t)-1||
iconv(sjis_cd,&in,&inleft,&out,&outleft)==(size_t)-1;
if(!err)sa_ntext=out-sa_text;
#endif
}break;
#if HAVE_ICONV
/*Check to see if a character set was specified.*/
case QR_MODE_ECI:{
const char *enc;
char buf[16];
unsigned cur_eci;
cur_eci=entry->payload.eci;
if(cur_eci<=QR_ECI_ISO8859_16&&cur_eci!=14){
if(cur_eci!=QR_ECI_GLI0&&cur_eci!=QR_ECI_CP437){
sprintf(buf,"ISO8859-%i",QR_MAXI(cur_eci,3)-2);
enc=buf;
}
/*Note that CP437 requires an iconv compiled with
--enable-extra-encodings, and thus may not be available.*/
else enc="CP437";
}
else if(cur_eci==QR_ECI_SJIS)enc="SJIS";
/*Don't know what this ECI code specifies, but not an encoding that
we recognize.*/
else continue;
eci=cur_eci;
eci_cd=iconv_open("UTF-8",enc);
}break;
#endif
/*Silence stupid compiler warnings.*/
default:break;
}
}
/*If eci should be reset between codes, do so.*/
if(eci<=QR_ECI_GLI1){
eci=-1;
#if HAVE_ICONV
if(eci_cd!=(iconv_t)-1)iconv_close(eci_cd);
#endif
}
}
#if HAVE_ICONV
if(eci_cd!=(iconv_t)-1)iconv_close(eci_cd);
#endif
if(!err){
sa_text[sa_ntext++]='\0';
if(sa_ctext+1>sa_ntext){
sa_text=(char *)realloc(sa_text,sa_ntext*sizeof(*sa_text));
}
zbar_symbol_t *sa_sym;
if(sa_size == 1)
sa_sym = syms;
else {
/* create "virtual" container symbol for composite result */
sa_sym = _zbar_image_scanner_alloc_sym(iscn, ZBAR_QRCODE, 0);
sa_sym->syms = _zbar_symbol_set_create();
sa_sym->syms->head = syms;
/* cheap out w/axis aligned bbox for now */
int xmin = img->width, xmax = -2;
int ymin = img->height, ymax = -2;
/* fixup data references */
for(; syms; syms = syms->next) {
_zbar_symbol_refcnt(syms, 1);
if(syms->type == ZBAR_PARTIAL)
sa_sym->type = ZBAR_PARTIAL;
else
for(j = 0; j < (int)syms->npts; j++) {
int u = syms->pts[j].x;
if(xmin >= u) xmin = u - 1;
if(xmax <= u) xmax = u + 1;
u = syms->pts[j].y;
if(ymin >= u) ymin = u - 1;
if(ymax <= u) ymax = u + 1;
}
syms->data = sa_text + syms->datalen;
int next = (syms->next) ? syms->next->datalen : sa_ntext;
assert(next > (int)syms->datalen);
syms->datalen = next - syms->datalen - 1;
}
if(xmax >= -1) {
sym_add_point(sa_sym, xmin, ymin);
sym_add_point(sa_sym, xmin, ymax);
sym_add_point(sa_sym, xmax, ymax);
sym_add_point(sa_sym, xmax, ymin);
}
}
sa_sym->data = sa_text;
sa_sym->data_alloc = sa_ntext;
sa_sym->datalen = sa_ntext - 1;
_zbar_image_scanner_add_sym(iscn, sa_sym);
}
else {
_zbar_image_scanner_recycle_syms(iscn, syms);
free(sa_text);
}
}
#if HAVE_ICONV
if(utf8_cd!=(iconv_t)-1)iconv_close(utf8_cd);
if(sjis_cd!=(iconv_t)-1)iconv_close(sjis_cd);
if(latin1_cd!=(iconv_t)-1)iconv_close(latin1_cd);
#endif
free(mark);
return ntext;
}