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#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "exif.h"
#include "jpeg.h"
struct impl {
SV *file_name;
struct exiftags *et;
};
typedef struct impl *Image__EXIF;
#ifndef Newxz
#define Newxz(ptr, n, type) Newz(705, ptr, n, type)
#endif
static void
load(pTHX_ struct impl *impl, const char *name)
{
int mark, first = 0;
unsigned int len, rlen;
unsigned char *exifbuf = NULL;
FILE *fp = fopen(name, "rb");
if (!fp)
croak("Can't open file %s: %s", name, strerror(errno));
while (jpegscan(fp, &mark, &len, !(first++))) {
if (mark != JPEG_M_APP1) {
if (fseek(fp, len, SEEK_CUR)) {
free(exifbuf);
fclose(fp);
croak("Can't seek in file %s: %s", name, strerror(errno));
}
continue;
}
exifbuf = (unsigned char *) malloc(len);
if (!exifbuf) {
fclose(fp);
croak("malloc failed");
}
rlen = fread(exifbuf, 1, len, fp);
if (rlen != len) {
free(exifbuf);
fclose(fp);
croak("error reading JPEG %s: length mismatch", name);
}
impl->et = exifparse(exifbuf, len);
break;
}
if (impl->et && !impl->et->props) {
exiffree(impl->et);
impl->et = 0;
}
free(exifbuf);
fclose(fp);
}
static STRLEN
trimmed_len(const char *p)
{
const char *endp = p + strlen(p);
while (endp > p) {
endp--;
if (!isspace(*endp))
return endp - p + 1;
}
return 0;
}
static SV *
get_props(pTHX_ struct impl *impl, unsigned short lvl)
{
struct exifprop *ep;
HV *hv = 0;
if (!impl->file_name)
croak("no Image::EXIF data loaded");
if (!impl->et)
return &PL_sv_undef;
for (ep = impl->et->props; ep; ep = ep->next) {
const char *name;
if (ep->lvl == ED_PAS)
/* Take care of point-and-shoot values. */
ep->lvl = ED_CAM;
else if (ep->lvl == ED_OVR || ep->lvl == ED_BAD)
/* For now, just treat overridden & bad values as verbose. */
ep->lvl = ED_VRB;
if (ep->lvl != lvl)
continue;
name = ep->descr ? ep->descr : ep->name;
if (!name || !*name)
continue;
if (!hv)
hv = newHV();
hv_store(hv, name, strlen(name),
ep->str ? newSVpvn(ep->str, trimmed_len(ep->str))
: newSViv(ep->value), 0);
}
return hv ? newRV_noinc((SV *) hv) : &PL_sv_undef;
}
MODULE = Image::EXIF PACKAGE = Image::EXIF
PROTOTYPES: DISABLE
Image::EXIF
_new_instance(package)
char *package
CODE:
struct impl *impl;
Newxz(impl, 1, struct impl);
RETVAL = impl;
OUTPUT:
RETVAL
void
_destroy_instance(impl)
Image::EXIF impl
CODE:
if (impl->file_name)
SvREFCNT_dec(impl->file_name);
if (impl->et)
exiffree(impl->et);
Safefree(impl);
void
_load_file(impl, file_name)
Image::EXIF impl
SV *file_name;
CODE:
load(aTHX_ impl, SvPV_nolen(file_name));
impl->file_name = SvREFCNT_inc(file_name);
SV *
_file_name(impl)
Image::EXIF impl
CODE:
RETVAL = newSVsv(impl->file_name);
OUTPUT:
RETVAL
SV *
get_camera_info(impl)
Image::EXIF impl
CODE:
RETVAL = get_props(aTHX_ impl, ED_CAM);
OUTPUT:
RETVAL
SV *
get_image_info(impl)
Image::EXIF impl
CODE:
RETVAL = get_props(aTHX_ impl, ED_IMG);
OUTPUT:
RETVAL
SV *
get_other_info(impl)
Image::EXIF impl
CODE:
RETVAL = get_props(aTHX_ impl, ED_VRB);
OUTPUT:
RETVAL
SV *
get_unknown_info(impl)
Image::EXIF impl
CODE:
RETVAL = get_props(aTHX_ impl, ED_UNK);
OUTPUT:
RETVAL
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