database: move code to db_save.c

1 files changed, 176 insertions, 0 deletions

diff --git a/src/db_save.c b/src/db_save.c
new file mode 100644
index 000000000..00967f4f2
--- /dev/null
+++ b/src/db_save.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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.
+ */
+
+#include "config.h"
+#include "db_save.h"
+#include "directory.h"
+#include "directory_save.h"
+#include "song.h"
+#include "path.h"
+#include "text_file.h"
+#include "tag.h"
+#include "tag_internal.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "database"
+
+#define DIRECTORY_INFO_BEGIN "info_begin"
+#define DIRECTORY_INFO_END "info_end"
+#define DB_FORMAT_PREFIX "format: "
+#define DIRECTORY_MPD_VERSION "mpd_version: "
+#define DIRECTORY_FS_CHARSET "fs_charset: "
+#define DB_TAG_PREFIX "tag: "
+
+enum {
+	DB_FORMAT = 1,
+};
+
+G_GNUC_CONST
+static GQuark
+db_quark(void)
+{
+	return g_quark_from_static_string("database");
+}
+
+void
+db_save_internal(FILE *fp, const struct directory *music_root)
+{
+	assert(music_root != NULL);
+
+	fprintf(fp, "%s\n", DIRECTORY_INFO_BEGIN);
+	fprintf(fp, DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
+	fprintf(fp, "%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
+	fprintf(fp, "%s%s\n", DIRECTORY_FS_CHARSET, path_get_fs_charset());
+
+	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
+		if (!ignore_tag_items[i])
+			fprintf(fp, DB_TAG_PREFIX "%s\n", tag_item_names[i]);
+
+	fprintf(fp, "%s\n", DIRECTORY_INFO_END);
+
+	directory_save(fp, music_root);
+}
+
+bool
+db_load_internal(FILE *fp, struct directory *music_root, GError **error)
+{
+	GString *buffer = g_string_sized_new(1024);
+	char *line;
+	int format = 0;
+	bool found_charset = false, found_version = false;
+	bool success;
+	bool tags[TAG_NUM_OF_ITEM_TYPES];
+
+	assert(music_root != NULL);
+
+	/* get initial info */
+	line = read_text_line(fp, buffer);
+	if (line == NULL || strcmp(DIRECTORY_INFO_BEGIN, line) != 0) {
+		g_set_error(error, db_quark(), 0, "Database corrupted");
+		g_string_free(buffer, true);
+		return false;
+	}
+
+	memset(tags, false, sizeof(tags));
+
+	while ((line = read_text_line(fp, buffer)) != NULL &&
+	       strcmp(line, DIRECTORY_INFO_END) != 0) {
+		if (g_str_has_prefix(line, DB_FORMAT_PREFIX)) {
+			format = atoi(line + sizeof(DB_FORMAT_PREFIX) - 1);
+		} else if (g_str_has_prefix(line, DIRECTORY_MPD_VERSION)) {
+			if (found_version) {
+				g_set_error(error, db_quark(), 0,
+					    "Duplicate version line");
+				g_string_free(buffer, true);
+				return false;
+			}
+
+			found_version = true;
+		} else if (g_str_has_prefix(line, DIRECTORY_FS_CHARSET)) {
+			const char *new_charset, *old_charset;
+
+			if (found_charset) {
+				g_set_error(error, db_quark(), 0,
+					    "Duplicate charset line");
+				g_string_free(buffer, true);
+				return false;
+			}
+
+			found_charset = true;
+
+			new_charset = line + sizeof(DIRECTORY_FS_CHARSET) - 1;
+			old_charset = path_get_fs_charset();
+			if (old_charset != NULL
+			    && strcmp(new_charset, old_charset)) {
+				g_set_error(error, db_quark(), 0,
+					    "Existing database has charset "
+					    "\"%s\" instead of \"%s\"; "
+					    "discarding database file",
+					    new_charset, old_charset);
+				g_string_free(buffer, true);
+				return false;
+			}
+		} else if (g_str_has_prefix(line, DB_TAG_PREFIX)) {
+			const char *name = line + sizeof(DB_TAG_PREFIX) - 1;
+			enum tag_type tag = tag_name_parse(name);
+			if (tag == TAG_NUM_OF_ITEM_TYPES) {
+				g_set_error(error, db_quark(), 0,
+					    "Unrecognized tag '%s', "
+					    "discarding database file",
+					    name);
+				return false;
+			}
+
+			tags[tag] = true;
+		} else {
+			g_set_error(error, db_quark(), 0,
+				    "Malformed line: %s", line);
+			g_string_free(buffer, true);
+			return false;
+		}
+	}
+
+	if (format != DB_FORMAT) {
+		g_set_error(error, db_quark(), 0,
+			    "Database format mismatch, "
+			    "discarding database file");
+		return false;
+	}
+
+	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
+		if (!ignore_tag_items[i] && !tags[i]) {
+			g_set_error(error, db_quark(), 0,
+				    "Tag list mismatch, "
+				    "discarding database file");
+			return false;
+		}
+	}
+
+	g_debug("reading DB");
+
+	success = directory_load(fp, music_root, buffer, error);
+	g_string_free(buffer, true);
+
+	return success;
+}