/* exif-utils.c
*
- * Copyright © 2001 Lutz Müller <lutz@users.sourceforge.net>
+ * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
*/
-#include "config.h"
-#include "exif-utils.h"
+#include <config.h>
-typedef signed short ExifSShort;
+#include <libexif/exif-utils.h>
-static ExifSShort
+void
+exif_array_set_byte_order (ExifFormat f, unsigned char *b, unsigned int n,
+ ExifByteOrder o_orig, ExifByteOrder o_new)
+{
+ unsigned int j;
+ unsigned int fs = exif_format_get_size (f);
+ ExifShort s;
+ ExifSShort ss;
+ ExifLong l;
+ ExifSLong sl;
+ ExifRational r;
+ ExifSRational sr;
+
+ if (!b || !n || !fs) return;
+
+ switch (f) {
+ case EXIF_FORMAT_SHORT:
+ for (j = 0; j < n; j++) {
+ s = exif_get_short (b + j * fs, o_orig);
+ exif_set_short (b + j * fs, o_new, s);
+ }
+ break;
+ case EXIF_FORMAT_SSHORT:
+ for (j = 0; j < n; j++) {
+ ss = exif_get_sshort (b + j * fs, o_orig);
+ exif_set_sshort (b + j * fs, o_new, ss);
+ }
+ break;
+ case EXIF_FORMAT_LONG:
+ for (j = 0; j < n; j++) {
+ l = exif_get_long (b + j * fs, o_orig);
+ exif_set_long (b + j * fs, o_new, l);
+ }
+ break;
+ case EXIF_FORMAT_RATIONAL:
+ for (j = 0; j < n; j++) {
+ r = exif_get_rational (b + j * fs, o_orig);
+ exif_set_rational (b + j * fs, o_new, r);
+ }
+ break;
+ case EXIF_FORMAT_SLONG:
+ for (j = 0; j < n; j++) {
+ sl = exif_get_slong (b + j * fs, o_orig);
+ exif_set_slong (b + j * fs, o_new, sl);
+ }
+ break;
+ case EXIF_FORMAT_SRATIONAL:
+ for (j = 0; j < n; j++) {
+ sr = exif_get_srational (b + j * fs, o_orig);
+ exif_set_srational (b + j * fs, o_new, sr);
+ }
+ break;
+ case EXIF_FORMAT_UNDEFINED:
+ case EXIF_FORMAT_BYTE:
+ case EXIF_FORMAT_ASCII:
+ default:
+ /* Nothing here. */
+ break;
+ }
+}
+
+ExifSShort
exif_get_sshort (const unsigned char *buf, ExifByteOrder order)
{
+ if (!buf) return 0;
switch (order) {
case EXIF_BYTE_ORDER_MOTOROLA:
return ((buf[0] << 8) | buf[1]);
}
void
-exif_set_short (unsigned char *b, ExifByteOrder order, ExifShort value)
+exif_set_sshort (unsigned char *b, ExifByteOrder order, ExifSShort value)
{
+ if (!b) return;
switch (order) {
case EXIF_BYTE_ORDER_MOTOROLA:
b[0] = (unsigned char) (value >> 8);
}
}
+void
+exif_set_short (unsigned char *b, ExifByteOrder order, ExifShort value)
+{
+ exif_set_sshort (b, order, value);
+}
+
ExifSLong
exif_get_slong (const unsigned char *b, ExifByteOrder order)
{
+ if (!b) return 0;
switch (order) {
case EXIF_BYTE_ORDER_MOTOROLA:
- return ((b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3]);
+ return (((uint32_t)b[0] << 24) | ((uint32_t)b[1] << 16) | ((uint32_t)b[2] << 8) | (uint32_t)b[3]);
case EXIF_BYTE_ORDER_INTEL:
- return ((b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0]);
+ return (((uint32_t)b[3] << 24) | ((uint32_t)b[2] << 16) | ((uint32_t)b[1] << 8) | (uint32_t)b[0]);
}
/* Won't be reached */
void
exif_set_slong (unsigned char *b, ExifByteOrder order, ExifSLong value)
{
+ if (!b) return;
switch (order) {
case EXIF_BYTE_ORDER_MOTOROLA:
b[0] = (unsigned char) (value >> 24);
{
ExifSRational r;
- r.numerator = exif_get_slong (buf, order);
- r.denominator = exif_get_slong (buf + 4, order);
+ r.numerator = buf ? exif_get_slong (buf, order) : 0;
+ r.denominator = buf ? exif_get_slong (buf + 4, order) : 0;
return (r);
}
{
ExifRational r;
- r.numerator = exif_get_long (buf, order);
- r.denominator = exif_get_long (buf + 4, order);
+ r.numerator = buf ? exif_get_long (buf, order) : 0;
+ r.denominator = buf ? exif_get_long (buf + 4, order) : 0;
return (r);
}
exif_set_rational (unsigned char *buf, ExifByteOrder order,
ExifRational value)
{
+ if (!buf) return;
exif_set_long (buf, order, value.numerator);
exif_set_long (buf + 4, order, value.denominator);
}
exif_set_srational (unsigned char *buf, ExifByteOrder order,
ExifSRational value)
{
+ if (!buf) return;
exif_set_slong (buf, order, value.numerator);
exif_set_slong (buf + 4, order, value.denominator);
}
+
+/*! This function converts rather UCS-2LE than UTF-16 to UTF-8.
+ * It should really be replaced by iconv().
+ */
+void
+exif_convert_utf16_to_utf8 (char *out, const unsigned char *in, int maxlen)
+{
+ if (maxlen <= 0) {
+ return;
+ }
+ for (;;) {
+ ExifShort v = exif_get_short(in, EXIF_BYTE_ORDER_INTEL);
+ if (!v)
+ break;
+ if (v < 0x80) {
+ if (maxlen > 1) {
+ *out++ = (char)v;
+ maxlen--;
+ } else {
+ break;
+ }
+ } else if (v < 0x800) {
+ if (maxlen > 2) {
+ *out++ = ((v >> 6) & 0x1F) | 0xC0;
+ *out++ = (v & 0x3F) | 0x80;
+ maxlen -= 2;
+ } else {
+ break;
+ }
+ } else {
+ if (maxlen > 3) {
+ *out++ = ((v >> 12) & 0x0F) | 0xE0;
+ *out++ = ((v >> 6) & 0x3F) | 0x80;
+ *out++ = (v & 0x3F) | 0x80;
+ maxlen -= 3;
+ } else {
+ break;
+ }
+ }
+ in += 2;
+ }
+ *out = 0;
+}