--- /dev/null
+/**
+ * Copyright (C) 2007 by INdT
+ *
+ * This program 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 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 Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * @author Gustavo Sverzut Barbieri <gustavo.barbieri@openbossa.org>
+ */
+
+/**
+ * @brief
+ *
+ * Reads PNG images.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define _XOPEN_SOURCE 600
+#include <lightmediascanner_plugin.h>
+#include <lightmediascanner_utils.h>
+#include <lightmediascanner_db.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+
+static inline unsigned int
+_chunk_to_uint(unsigned char *buf)
+{
+ return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
+}
+
+static int
+_png_data_get(int fd, struct lms_image_info *info)
+{
+ unsigned char buf[16], *p;
+ const unsigned char sig[8] = {0x89, 0x50, 0x4e, 0x47, 0xd, 0xa, 0x1a, 0xa};
+ const unsigned char ihdr[4] = {'I', 'H', 'D', 'R'};
+ unsigned int length;
+
+ if (read(fd, buf, sizeof(buf)) != sizeof(buf)) {
+ perror("read");
+ return -1;
+ }
+
+ if (memcmp(buf, sig, sizeof(sig)) != 0) {
+ fprintf(stderr, "ERROR: invalid PNG signature.\n");
+ return -2;
+ }
+
+ p = buf + sizeof(sig) + 4;
+ if (memcmp(p, ihdr, sizeof(ihdr)) != 0) {
+ fprintf(stderr, "ERROR: invalid first chunk: %4.4s.\n", p);
+ return -3;
+ }
+
+ p = buf + sizeof(sig);
+ length = _chunk_to_uint(p);
+ if (length < 13) {
+ fprintf(stderr, "ERROR: IHDR chunk size is too small: %d.\n", length);
+ return -4;
+ }
+
+ if (read(fd, buf, 8) != 8) {
+ perror("read");
+ return -5;
+ }
+ info->width = _chunk_to_uint(buf);
+ info->height = _chunk_to_uint(buf + 4);
+
+ return 0;
+}
+
+static const char _name[] = "png";
+static const struct lms_string_size _exts[] = {
+ LMS_STATIC_STRING_SIZE(".png")
+};
+
+struct plugin {
+ struct lms_plugin plugin;
+ lms_db_image_t *img_db;
+};
+
+static void *
+_match(struct plugin *p, const char *path, int len, int base)
+{
+ int i;
+
+ i = lms_which_extension(path, len, _exts, LMS_ARRAY_SIZE(_exts));
+ if (i < 0)
+ return NULL;
+ else
+ return (void*)(i + 1);
+}
+
+static int
+_parse(struct plugin *plugin, struct lms_context *ctxt, const struct lms_file_info *finfo, void *match)
+{
+ struct lms_image_info info = {0};
+ int fd, r;
+
+ fd = open(finfo->path, O_RDONLY);
+ if (fd < 0) {
+ perror("open");
+ return -1;
+ }
+
+ if (_png_data_get(fd, &info) != 0) {
+ r = -2;
+ goto done;
+ }
+
+ if (info.date == 0)
+ info.date = finfo->mtime;
+
+ if (!info.title.str) {
+ int ext_idx;
+
+ ext_idx = ((int)match) - 1;
+ info.title.len = finfo->path_len - finfo->base - _exts[ext_idx].len;
+ info.title.str = malloc((info.title.len + 1) * sizeof(char));
+ memcpy(info.title.str, finfo->path + finfo->base, info.title.len);
+ info.title.str[info.title.len] = '\0';
+ }
+
+ if (info.title.str)
+ lms_charset_conv(ctxt->cs_conv, &info.title.str, &info.title.len);
+ if (info.artist.str)
+ lms_charset_conv(ctxt->cs_conv, &info.artist.str, &info.artist.len);
+
+ info.id = finfo->id;
+ r = lms_db_image_add(plugin->img_db, &info);
+
+ done:
+ if (info.title.str)
+ free(info.title.str);
+ if (info.artist.str)
+ free(info.artist.str);
+
+ posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
+ close(fd);
+
+ return r;
+}
+
+static int
+_setup(struct plugin *plugin, struct lms_context *ctxt)
+{
+ plugin->img_db = lms_db_image_new(ctxt->db);
+ if (!plugin->img_db)
+ return -1;
+
+ return 0;
+}
+
+static int
+_start(struct plugin *plugin, struct lms_context *ctxt)
+{
+ return lms_db_image_start(plugin->img_db);
+}
+
+static int
+_finish(struct plugin *plugin, struct lms_context *ctxt)
+{
+ if (plugin->img_db)
+ return lms_db_image_free(plugin->img_db);
+
+ return 0;
+}
+
+
+static int
+_close(struct plugin *plugin)
+{
+ free(plugin);
+ return 0;
+}
+
+API struct lms_plugin *
+lms_plugin_open(void)
+{
+ struct plugin *plugin;
+
+ plugin = malloc(sizeof(*plugin));
+ plugin->plugin.name = _name;
+ plugin->plugin.match = (lms_plugin_match_fn_t)_match;
+ plugin->plugin.parse = (lms_plugin_parse_fn_t)_parse;
+ plugin->plugin.close = (lms_plugin_close_fn_t)_close;
+ plugin->plugin.setup = (lms_plugin_setup_fn_t)_setup;
+ plugin->plugin.start = (lms_plugin_start_fn_t)_start;
+ plugin->plugin.finish = (lms_plugin_finish_fn_t)_finish;
+
+ return (struct lms_plugin *)plugin;
+}
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