Add libexif to deps/third_party.

libexif/sources/libexif/exif-log.c

+/* exif-log.c
+ *
+ * Copyright (c) 2004 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
+ * 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., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA.
+ */
+
+#include <config.h>
+
+#include <libexif/exif-log.h>
+#include <libexif/i18n.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+struct _ExifLog {
+        unsigned int ref_count;
+
+        ExifLogFunc func;
+        void *data;
+
+        ExifMem *mem;
+};
+
+static const struct {
+        ExifLogCode code;
+        const char *title;
+        const char *message;
+} codes[] = {
+        { EXIF_LOG_CODE_DEBUG, N_("Debugging information"),
+          N_("Debugging information is available.") },
+        { EXIF_LOG_CODE_NO_MEMORY, N_("Not enough memory"),
+          N_("The system cannot provide enough memory.") },
+        { EXIF_LOG_CODE_CORRUPT_DATA, N_("Corrupt data"),
+          N_("The data provided does not follow the specification.") },
+        { 0, NULL, NULL }
+};
+
+const char *
+exif_log_code_get_title (ExifLogCode code)
+{
+        unsigned int i;
+
+        for (i = 0; codes[i].title; i++) if (codes[i].code == code) break;
+        return _(codes[i].title);
+}
+
+const char *
+exif_log_code_get_message (ExifLogCode code)
+{
+        unsigned int i;
+
+        for (i = 0; codes[i].message; i++) if (codes[i].code == code) break;
+        return _(codes[i].message);
+}
+
+ExifLog *
+exif_log_new_mem (ExifMem *mem)
+{
+        ExifLog *log;
+
+        log = exif_mem_alloc (mem, sizeof (ExifLog));
+        if (!log) return NULL;
+        log->ref_count = 1;
+
+        log->mem = mem;
+        exif_mem_ref (mem);
+
+        return log;
+}
+
+ExifLog *
+exif_log_new (void)
+{
+        ExifMem *mem = exif_mem_new_default ();
+        ExifLog *log = exif_log_new_mem (mem);
+
+        exif_mem_unref (mem);
+
+        return log;
+}
+
+void
+exif_log_ref (ExifLog *log)
+{
+        if (!log) return;
+        log->ref_count++;
+}
+
+void
+exif_log_unref (ExifLog *log)
+{
+        if (!log) return;
+        if (log->ref_count > 0) log->ref_count--;
+        if (!log->ref_count) exif_log_free (log);
+}
+
+void
+exif_log_free (ExifLog *log)
+{
+        ExifMem *mem = log ? log->mem : NULL;
+
+        if (!log) return;
+
+        exif_mem_free (mem, log);
+        exif_mem_unref (mem);
+}
+
+void
+exif_log_set_func (ExifLog *log, ExifLogFunc func, void *data)
+{
+        if (!log) return;
+        log->func = func;
+        log->data = data;
+}
+
+#ifdef NO_VERBOSE_TAG_STRINGS
+/* exif_log forms part of the API and can't be commented away */
+#undef exif_log
+#endif
+void
+exif_log (ExifLog *log, ExifLogCode code, const char *domain,
+          const char *format, ...)
+{
+        va_list args;
+
+        va_start (args, format);
+        exif_logv (log, code, domain, format, args);
+        va_end (args);
+}
+
+void
+exif_logv (ExifLog *log, ExifLogCode code, const char *domain,
+           const char *format, va_list args)
+{
+        if (!log) return;
+        if (!log->func) return;
+        log->func (log, code, domain, format, args, log->data);
+}