/* exif-content.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 <libexif/exif-content.h>
+#include <libexif/exif-system.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
-static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
+/* unused constant
+ * static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
+ */
struct _ExifContentPrivate
{
unsigned int ref_count;
ExifMem *mem;
+ ExifLog *log;
};
ExifContent *
void
exif_content_ref (ExifContent *content)
{
+ if (!content)
+ return;
+
content->priv->ref_count++;
}
void
exif_content_unref (ExifContent *content)
{
+ if (!content)
+ return;
+
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) {
- ExifMem *mem = content->priv->mem;
- exif_mem_free (mem, content->entries);
- exif_mem_free (mem, content->priv);
- exif_mem_free (mem, content);
- exif_mem_unref (mem);
+ 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';
+ unsigned int i, l;
if (!content)
return;
- printf ("%sDumping exif content (%i entries)...\n", buf,
+ l = MIN(sizeof(buf)-1, 2*indent);
+ memset(buf, ' ', l);
+ buf[l] = '\0';
+
+ printf ("%sDumping exif content (%u 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 *content, ExifEntry *entry)
+exif_content_add_entry (ExifContent *c, ExifEntry *entry)
{
- if (!content || !content->priv || !entry || entry->parent) return;
+ ExifEntry **entries;
+ 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 = content;
- content->entries = exif_mem_realloc (content->priv->mem,
- content->entries, sizeof (ExifEntry) * (content->count + 1));
- if (!content->entries) return;
- content->entries[content->count] = entry;
+ entries = exif_mem_realloc (c->priv->mem,
+ c->entries, sizeof (ExifEntry*) * (c->count + 1));
+ if (!entries) return;
+ entry->parent = c;
+ entries[c->count++] = entry;
+ c->entries = entries;
exif_entry_ref (entry);
- content->count++;
}
void
exif_content_remove_entry (ExifContent *c, ExifEntry *e)
{
unsigned int i;
+ ExifEntry **t, *temp;
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;
+ 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--;
+ temp = c->entries[c->count-1];
+ if (c->count > 1) {
+ t = exif_mem_realloc (c->priv->mem, c->entries,
+ sizeof(ExifEntry*) * (c->count - 1));
+ if (!t) {
+ return;
+ }
+ c->entries = t;
+ c->count--;
+ if (i != c->count) { /* we deallocated the last slot already */
+ memmove (&t[i], &t[i + 1], sizeof (ExifEntry*) * (c->count - i - 1));
+ t[c->count-1] = temp;
+ }
+ } else {
+ exif_mem_free (c->priv->mem, c->entries);
+ c->entries = NULL;
+ c->count = 0;
+ }
e->parent = NULL;
exif_entry_unref (e);
- c->entries = exif_mem_realloc (c->priv->mem, c->entries,
- sizeof(ExifEntry) * c->count);
}
ExifEntry *
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);
+}
+
+ExifIfd
+exif_content_get_ifd (ExifContent *c)
+{
+ if (!c || !c->parent) return EXIF_IFD_COUNT;
+
+ return
+ ((c)->parent->ifd[EXIF_IFD_EXIF] == (c)) ? EXIF_IFD_EXIF :
+ ((c)->parent->ifd[EXIF_IFD_0] == (c)) ? EXIF_IFD_0 :
+ ((c)->parent->ifd[EXIF_IFD_1] == (c)) ? EXIF_IFD_1 :
+ ((c)->parent->ifd[EXIF_IFD_GPS] == (c)) ? EXIF_IFD_GPS :
+ ((c)->parent->ifd[EXIF_IFD_INTEROPERABILITY] == (c)) ? EXIF_IFD_INTEROPERABILITY :
+ EXIF_IFD_COUNT;
+}
+
+static void
+fix_func (ExifEntry *e, void *UNUSED(data))
+{
+ exif_entry_fix (e);
+}
+
+/*!
+ * Check if this entry is unknown and if so, delete it.
+ * \note Be careful calling this function in a loop. Deleting an entry from
+ * an ExifContent changes the index of subsequent entries, as well as the
+ * total size of the entries array.
+ */
+static void
+remove_not_recorded (ExifEntry *e, void *UNUSED(data))
+{
+ ExifIfd ifd = exif_entry_get_ifd(e) ;
+ ExifContent *c = e->parent;
+ ExifDataType dt = exif_data_get_data_type (c->parent);
+ ExifTag t = e->tag;
+
+ if (exif_tag_get_support_level_in_ifd (t, ifd, dt) ==
+ EXIF_SUPPORT_LEVEL_NOT_RECORDED) {
+ exif_log (c->priv->log, EXIF_LOG_CODE_DEBUG, "exif-content",
+ "Tag 0x%04x is not recorded in IFD '%s' and has therefore been "
+ "removed.", t, exif_ifd_get_name (ifd));
+ exif_content_remove_entry (c, e);
+ }
+
+}
+
+void
+exif_content_fix (ExifContent *c)
+{
+ ExifIfd ifd = exif_content_get_ifd (c);
+ ExifDataType dt;
+ ExifEntry *e;
+ unsigned int i, num;
+
+ if (!c)
+ return;
+
+ dt = exif_data_get_data_type (c->parent);
+
+ /*
+ * First of all, fix all existing entries.
+ */
+ exif_content_foreach_entry (c, fix_func, NULL);
+
+ /*
+ * Go through each tag and if it's not recorded, remove it. If one
+ * is removed, exif_content_foreach_entry() will skip the next entry,
+ * so if this happens do the loop again from the beginning to ensure
+ * they're all checked. This could be avoided if we stop relying on
+ * exif_content_foreach_entry but loop intelligently here.
+ */
+ do {
+ num = c->count;
+ exif_content_foreach_entry (c, remove_not_recorded, NULL);
+ } while (num != c->count);
+
+ /*
+ * Then check for non-existing mandatory tags and create them if needed
+ */
+ num = exif_tag_table_count();
+ for (i = 0; i < num; ++i) {
+ const ExifTag t = exif_tag_table_get_tag (i);
+ if (exif_tag_get_support_level_in_ifd (t, ifd, dt) ==
+ EXIF_SUPPORT_LEVEL_MANDATORY) {
+ if (exif_content_get_entry (c, t))
+ /* This tag already exists */
+ continue;
+ exif_log (c->priv->log, EXIF_LOG_CODE_DEBUG, "exif-content",
+ "Tag '%s' is mandatory in IFD '%s' and has therefore been added.",
+ exif_tag_get_name_in_ifd (t, ifd), exif_ifd_get_name (ifd));
+ e = exif_entry_new ();
+ exif_content_add_entry (c, e);
+ exif_entry_initialize (e, t);
+ exif_entry_unref (e);
+ }
+ }
+}
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