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/* iptc-utils.c
*
* Copyright 2005 David Moore <dcm@acm.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* 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.
*/
#include "config.h"
#include "iptc-utils.h"
typedef signed short IptcSShort;
static IptcSShort
iptc_get_sshort (const unsigned char *buf, IptcByteOrder order)
{
if (!buf) return 0;
switch (order) {
case IPTC_BYTE_ORDER_MOTOROLA:
return ((buf[0] << 8) | buf[1]);
case IPTC_BYTE_ORDER_INTEL:
return ((buf[1] << 8) | buf[0]);
}
/* Won't be reached */
return (0);
}
IptcShort
iptc_get_short (const unsigned char *buf, IptcByteOrder order)
{
return (iptc_get_sshort (buf, order) & 0xffff);
}
void
iptc_set_short (unsigned char *b, IptcByteOrder order, IptcShort value)
{
if (!b) return;
switch (order) {
case IPTC_BYTE_ORDER_MOTOROLA:
b[0] = (unsigned char) (value >> 8);
b[1] = (unsigned char) value;
break;
case IPTC_BYTE_ORDER_INTEL:
b[0] = (unsigned char) value;
b[1] = (unsigned char) (value >> 8);
break;
}
}
IptcSLong
iptc_get_slong (const unsigned char *b, IptcByteOrder order)
{
if (!b) return 0;
switch (order) {
case IPTC_BYTE_ORDER_MOTOROLA:
return ((b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3]);
case IPTC_BYTE_ORDER_INTEL:
return ((b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0]);
}
/* Won't be reached */
return (0);
}
void
iptc_set_slong (unsigned char *b, IptcByteOrder order, IptcSLong value)
{
if (!b) return;
switch (order) {
case IPTC_BYTE_ORDER_MOTOROLA:
b[0] = (unsigned char) (value >> 24);
b[1] = (unsigned char) (value >> 16);
b[2] = (unsigned char) (value >> 8);
b[3] = (unsigned char) value;
break;
case IPTC_BYTE_ORDER_INTEL:
b[3] = (unsigned char) (value >> 24);
b[2] = (unsigned char) (value >> 16);
b[1] = (unsigned char) (value >> 8);
b[0] = (unsigned char) value;
break;
}
}
IptcLong
iptc_get_long (const unsigned char *buf, IptcByteOrder order)
{
return (iptc_get_slong (buf, order) & 0xffffffff);
}
void
iptc_set_long (unsigned char *b, IptcByteOrder order, IptcLong value)
{
iptc_set_slong (b, order, value);
}
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