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/* exif-content.c
*
* Copyright © 2001 Lutz Müller <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
* 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 <libexif/exif-content.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
struct _ExifContentPrivate
{
unsigned int ref_count;
ExifMem *mem;
ExifLog *log;
};
ExifContent *
exif_content_new (void)
{
ExifMem *mem = exif_mem_new_default ();
ExifContent *content = exif_content_new_mem (mem);
exif_mem_unref (mem);
return content;
}
ExifContent *
exif_content_new_mem (ExifMem *mem)
{
ExifContent *content;
if (!mem) return NULL;
content = exif_mem_alloc (mem, (ExifLong) sizeof (ExifContent));
if (!content)
return NULL;
content->priv = exif_mem_alloc (mem,
(ExifLong) sizeof (ExifContentPrivate));
if (!content->priv) {
exif_mem_free (mem, content);
return NULL;
}
content->priv->ref_count = 1;
content->priv->mem = mem;
exif_mem_ref (mem);
return content;
}
void
exif_content_ref (ExifContent *content)
{
content->priv->ref_count++;
}
void
exif_content_unref (ExifContent *content)
{
content->priv->ref_count--;
if (!content->priv->ref_count)
exif_content_free (content);
}
void
exif_content_free (ExifContent *content)
{
ExifMem *mem = (content && content->priv) ? content->priv->mem : NULL;
unsigned int i;
if (!content) return;
for (i = 0; i < content->count; i++)
exif_entry_unref (content->entries[i]);
exif_mem_free (mem, content->entries);
if (content->priv) {
exif_log_unref (content->priv->log);
}
exif_mem_free (mem, content->priv);
exif_mem_free (mem, content);
exif_mem_unref (mem);
}
void
exif_content_dump (ExifContent *content, unsigned int indent)
{
char buf[1024];
unsigned int i;
for (i = 0; i < 2 * indent; i++)
buf[i] = ' ';
buf[i] = '\0';
if (!content)
return;
printf ("%sDumping exif content (%i entries)...\n", buf,
content->count);
for (i = 0; i < content->count; i++)
exif_entry_dump (content->entries[i], indent + 1);
}
void
exif_content_add_entry (ExifContent *c, ExifEntry *entry)
{
if (!c || !c->priv || !entry || entry->parent) return;
/* One tag can only be added once to an IFD. */
if (exif_content_get_entry (c, entry->tag)) {
exif_log (c->priv->log, EXIF_LOG_CODE_DEBUG, "ExifContent",
"An attempt has been made to add "
"the tag '%s' twice to an IFD. This is against "
"specification.", exif_tag_get_name (entry->tag));
return;
}
entry->parent = c;
c->entries = exif_mem_realloc (c->priv->mem,
c->entries, sizeof (ExifEntry) * (c->count + 1));
if (!c->entries) return;
c->entries[c->count] = entry;
exif_entry_ref (entry);
c->count++;
}
void
exif_content_remove_entry (ExifContent *c, ExifEntry *e)
{
unsigned int i;
if (!c || !c->priv || !e || (e->parent != c)) return;
/* Search the entry */
for (i = 0; i < c->count; i++) if (c->entries[i] == e) break;
if (i == c->count) return;
/* Remove the entry */
memmove (&c->entries[i], &c->entries[i + 1],
sizeof (ExifEntry) * (c->count - i - 1));
c->count--;
e->parent = NULL;
exif_entry_unref (e);
c->entries = exif_mem_realloc (c->priv->mem, c->entries,
sizeof(ExifEntry) * c->count);
}
ExifEntry *
exif_content_get_entry (ExifContent *content, ExifTag tag)
{
unsigned int i;
if (!content)
return (NULL);
for (i = 0; i < content->count; i++)
if (content->entries[i]->tag == tag)
return (content->entries[i]);
return (NULL);
}
void
exif_content_foreach_entry (ExifContent *content,
ExifContentForeachEntryFunc func, void *data)
{
unsigned int i;
if (!content || !func)
return;
for (i = 0; i < content->count; i++)
func (content->entries[i], data);
}
void
exif_content_log (ExifContent *content, ExifLog *log)
{
if (!content || !content->priv || !log || content->priv->log == log)
return;
if (content->priv->log) exif_log_unref (content->priv->log);
content->priv->log = log;
exif_log_ref (log);
}
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