+/*
+ * Copyright (C) 2021 The Geeqie Team
+ *
+ * Authors: Colin Clark
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * @file
+ * This uses libraw to extract a thumbnail from a raw image. The exiv2 library
+ * does not (yet) extract thumbnails from .cr3 images.
+ * LibRaw seems to be slower than exiv2, so let exiv2 have priority.
+ */
+
+#include "main.h"
+
+#include "filefilter.h"
+#include "image-load.h"
+#include "image_load_libraw.h"
+
+#ifdef HAVE_RAW
+
+#include <libraw/libraw.h>
+#include <sys/mman.h>
+
+typedef struct _UnmapData UnmapData;
+struct _UnmapData
+{
+ guchar *ptr;
+ guchar *map_data;
+ size_t map_len;
+ libraw_data_t *lrdt;
+};
+
+static GList *libraw_unmap_list = 0;
+
+void libraw_free_preview(guchar *buf)
+{
+ GList *work = libraw_unmap_list;
+
+ while (work)
+ {
+ UnmapData *ud = (UnmapData *)work->data;
+ if (ud->ptr == buf)
+ {
+ munmap(ud->map_data, ud->map_len);
+ libraw_close(ud->lrdt);
+ libraw_unmap_list = g_list_remove_link(libraw_unmap_list, work);
+ g_free(ud);
+ return;
+ }
+ work = work->next;
+ }
+ g_assert_not_reached();
+}
+
+guchar *libraw_get_preview(ImageLoader *il, guint *data_len)
+{
+ libraw_data_t *lrdt;
+ int ret;
+ UnmapData *ud;
+ struct stat st;
+ guchar *map_data;
+ size_t map_len;
+ int fd;
+
+ if (!filter_file_class(il->fd->path, FORMAT_CLASS_RAWIMAGE)) return NULL;
+
+ fd = open(il->fd->path, O_RDONLY);
+ if (fd == -1)
+ {
+ return NULL;
+ }
+
+ if (fstat(fd, &st) == -1)
+ {
+ close(fd);
+ return NULL;
+ }
+
+ map_len = st.st_size;
+ map_data = (guchar *) mmap(0, map_len, PROT_READ, MAP_PRIVATE, fd, 0);
+ close(fd);
+
+ if (map_data == MAP_FAILED)
+ {
+ return NULL;
+ }
+
+ lrdt = libraw_init(0);
+ if (!lrdt)
+ {
+ log_printf("Warning: Cannot create libraw handle\n");
+ return NULL;
+ }
+
+ ret = libraw_open_buffer(lrdt, (void *)map_data, map_len);
+ if (ret == LIBRAW_SUCCESS)
+ {
+ ret = libraw_unpack_thumb(lrdt);
+ if (ret == LIBRAW_SUCCESS)
+ {
+ il->mapped_file = (guchar *)lrdt->thumbnail.thumb;
+ *data_len = lrdt->thumbnail.tlength;
+
+ ud = g_new(UnmapData, 1);
+ ud->ptr =(guchar *)lrdt->thumbnail.thumb;
+ ud->map_data = map_data;
+ ud->map_len = lrdt->thumbnail.tlength;
+ ud->lrdt = lrdt;
+
+ libraw_unmap_list = g_list_prepend(libraw_unmap_list, ud);
+
+ return (guchar *)lrdt->thumbnail.thumb;
+ }
+ }
+
+ libraw_close(lrdt);
+
+ return NULL;
+}
+
+#else /* !define HAVE_RAW */
+
+void libraw_free_preview(guchar *buf)
+{
+}
+
+guchar *libraw_get_preview(ImageLoader *il, guint *data_len)
+{
+ return NULL;
+}
+
+#endif
+
+/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */