db_save, state_file: convert to C++

1 files changed, 252 insertions, 0 deletions

diff --git a/src/PlaylistState.cxx b/src/PlaylistState.cxx
new file mode 100644
index 000000000..0cfd32723
--- /dev/null
+++ b/src/PlaylistState.cxx
@@ -0,0 +1,252 @@
+/*
+ * 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.
+ */
+
+/*
+ * Saving and loading the playlist to/from the state file.
+ *
+ */
+
+#include "config.h"
+#include "PlaylistState.hxx"
+#include "QueueSave.hxx"
+
+extern "C" {
+#include "playlist.h"
+#include "player_control.h"
+#include "text_file.h"
+#include "conf.h"
+}
+
+#include <string.h>
+#include <stdlib.h>
+
+#define PLAYLIST_STATE_FILE_STATE		"state: "
+#define PLAYLIST_STATE_FILE_RANDOM		"random: "
+#define PLAYLIST_STATE_FILE_REPEAT		"repeat: "
+#define PLAYLIST_STATE_FILE_SINGLE		"single: "
+#define PLAYLIST_STATE_FILE_CONSUME		"consume: "
+#define PLAYLIST_STATE_FILE_CURRENT		"current: "
+#define PLAYLIST_STATE_FILE_TIME		"time: "
+#define PLAYLIST_STATE_FILE_CROSSFADE		"crossfade: "
+#define PLAYLIST_STATE_FILE_MIXRAMPDB		"mixrampdb: "
+#define PLAYLIST_STATE_FILE_MIXRAMPDELAY	"mixrampdelay: "
+#define PLAYLIST_STATE_FILE_PLAYLIST_BEGIN	"playlist_begin"
+#define PLAYLIST_STATE_FILE_PLAYLIST_END	"playlist_end"
+
+#define PLAYLIST_STATE_FILE_STATE_PLAY		"play"
+#define PLAYLIST_STATE_FILE_STATE_PAUSE		"pause"
+#define PLAYLIST_STATE_FILE_STATE_STOP		"stop"
+
+#define PLAYLIST_BUFFER_SIZE	2*MPD_PATH_MAX
+
+void
+playlist_state_save(FILE *fp, const struct playlist *playlist,
+		    struct player_control *pc)
+{
+	struct player_status player_status;
+
+	pc_get_status(pc, &player_status);
+
+	fputs(PLAYLIST_STATE_FILE_STATE, fp);
+
+	if (playlist->playing) {
+		switch (player_status.state) {
+		case PLAYER_STATE_PAUSE:
+			fputs(PLAYLIST_STATE_FILE_STATE_PAUSE "\n", fp);
+			break;
+		default:
+			fputs(PLAYLIST_STATE_FILE_STATE_PLAY "\n", fp);
+		}
+		fprintf(fp, PLAYLIST_STATE_FILE_CURRENT "%i\n",
+			queue_order_to_position(&playlist->queue,
+						playlist->current));
+		fprintf(fp, PLAYLIST_STATE_FILE_TIME "%i\n",
+			(int)player_status.elapsed_time);
+	} else {
+		fputs(PLAYLIST_STATE_FILE_STATE_STOP "\n", fp);
+
+		if (playlist->current >= 0)
+			fprintf(fp, PLAYLIST_STATE_FILE_CURRENT "%i\n",
+				queue_order_to_position(&playlist->queue,
+							playlist->current));
+	}
+
+	fprintf(fp, PLAYLIST_STATE_FILE_RANDOM "%i\n", playlist->queue.random);
+	fprintf(fp, PLAYLIST_STATE_FILE_REPEAT "%i\n", playlist->queue.repeat);
+	fprintf(fp, PLAYLIST_STATE_FILE_SINGLE "%i\n", playlist->queue.single);
+	fprintf(fp, PLAYLIST_STATE_FILE_CONSUME "%i\n",
+		playlist->queue.consume);
+	fprintf(fp, PLAYLIST_STATE_FILE_CROSSFADE "%i\n",
+		(int)(pc_get_cross_fade(pc)));
+	fprintf(fp, PLAYLIST_STATE_FILE_MIXRAMPDB "%f\n",
+		pc_get_mixramp_db(pc));
+	fprintf(fp, PLAYLIST_STATE_FILE_MIXRAMPDELAY "%f\n",
+		pc_get_mixramp_delay(pc));
+	fputs(PLAYLIST_STATE_FILE_PLAYLIST_BEGIN "\n", fp);
+	queue_save(fp, &playlist->queue);
+	fputs(PLAYLIST_STATE_FILE_PLAYLIST_END "\n", fp);
+}
+
+static void
+playlist_state_load(FILE *fp, GString *buffer, struct playlist *playlist)
+{
+	const char *line = read_text_line(fp, buffer);
+	if (line == NULL) {
+		g_warning("No playlist in state file");
+		return;
+	}
+
+	while (!g_str_has_prefix(line, PLAYLIST_STATE_FILE_PLAYLIST_END)) {
+		queue_load_song(fp, buffer, line, &playlist->queue);
+
+		line = read_text_line(fp, buffer);
+		if (line == NULL) {
+			g_warning("'" PLAYLIST_STATE_FILE_PLAYLIST_END
+				  "' not found in state file");
+			break;
+		}
+	}
+
+	queue_increment_version(&playlist->queue);
+}
+
+bool
+playlist_state_restore(const char *line, FILE *fp, GString *buffer,
+		       struct playlist *playlist, struct player_control *pc)
+{
+	int current = -1;
+	int seek_time = 0;
+	enum player_state state = PLAYER_STATE_STOP;
+	bool random_mode = false;
+
+	if (!g_str_has_prefix(line, PLAYLIST_STATE_FILE_STATE))
+		return false;
+
+	line += sizeof(PLAYLIST_STATE_FILE_STATE) - 1;
+
+	if (strcmp(line, PLAYLIST_STATE_FILE_STATE_PLAY) == 0)
+		state = PLAYER_STATE_PLAY;
+	else if (strcmp(line, PLAYLIST_STATE_FILE_STATE_PAUSE) == 0)
+		state = PLAYER_STATE_PAUSE;
+
+	while ((line = read_text_line(fp, buffer)) != NULL) {
+		if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_TIME)) {
+			seek_time =
+			    atoi(&(line[strlen(PLAYLIST_STATE_FILE_TIME)]));
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_REPEAT)) {
+			if (strcmp
+			    (&(line[strlen(PLAYLIST_STATE_FILE_REPEAT)]),
+			     "1") == 0) {
+				playlist_set_repeat(playlist, pc, true);
+			} else
+				playlist_set_repeat(playlist, pc, false);
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_SINGLE)) {
+			if (strcmp
+			    (&(line[strlen(PLAYLIST_STATE_FILE_SINGLE)]),
+			     "1") == 0) {
+				playlist_set_single(playlist, pc, true);
+			} else
+				playlist_set_single(playlist, pc, false);
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_CONSUME)) {
+			if (strcmp
+			    (&(line[strlen(PLAYLIST_STATE_FILE_CONSUME)]),
+			     "1") == 0) {
+				playlist_set_consume(playlist, true);
+			} else
+				playlist_set_consume(playlist, false);
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_CROSSFADE)) {
+			pc_set_cross_fade(pc,
+					  atoi(line + strlen(PLAYLIST_STATE_FILE_CROSSFADE)));
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_MIXRAMPDB)) {
+			pc_set_mixramp_db(pc,
+					  atof(line + strlen(PLAYLIST_STATE_FILE_MIXRAMPDB)));
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_MIXRAMPDELAY)) {
+			pc_set_mixramp_delay(pc,
+					     atof(line + strlen(PLAYLIST_STATE_FILE_MIXRAMPDELAY)));
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_RANDOM)) {
+			random_mode =
+				strcmp(line + strlen(PLAYLIST_STATE_FILE_RANDOM),
+				       "1") == 0;
+		} else if (g_str_has_prefix(line, PLAYLIST_STATE_FILE_CURRENT)) {
+			current = atoi(&(line
+					 [strlen
+					  (PLAYLIST_STATE_FILE_CURRENT)]));
+		} else if (g_str_has_prefix(line,
+					    PLAYLIST_STATE_FILE_PLAYLIST_BEGIN)) {
+			playlist_state_load(fp, buffer, playlist);
+		}
+	}
+
+	playlist_set_random(playlist, pc, random_mode);
+
+	if (!queue_is_empty(&playlist->queue)) {
+		if (!queue_valid_position(&playlist->queue, current))
+			current = 0;
+
+		if (state == PLAYER_STATE_PLAY &&
+		    config_get_bool("restore_paused", false))
+			/* the user doesn't want MPD to auto-start
+			   playback after startup; fall back to
+			   "pause" */
+			state = PLAYER_STATE_PAUSE;
+
+		/* enable all devices for the first time; this must be
+		   called here, after the audio output states were
+		   restored, before playback begins */
+		if (state != PLAYER_STATE_STOP)
+			pc_update_audio(pc);
+
+		if (state == PLAYER_STATE_STOP /* && config_option */)
+			playlist->current = current;
+		else if (seek_time == 0)
+			playlist_play(playlist, pc, current);
+		else
+			playlist_seek_song(playlist, pc, current, seek_time);
+
+		if (state == PLAYER_STATE_PAUSE)
+			pc_pause(pc);
+	}
+
+	return true;
+}
+
+unsigned
+playlist_state_get_hash(const struct playlist *playlist,
+			struct player_control *pc)
+{
+	struct player_status player_status;
+
+	pc_get_status(pc, &player_status);
+
+	return playlist->queue.version ^
+		(player_status.state != PLAYER_STATE_STOP
+		 ? ((int)player_status.elapsed_time << 8)
+		 : 0) ^
+		(playlist->current >= 0
+		 ? (queue_order_to_position(&playlist->queue,
+					    playlist->current) << 16)
+		 : 0) ^
+		((int)pc_get_cross_fade(pc) << 20) ^
+		(player_status.state << 24) ^
+		(playlist->queue.random << 27) ^
+		(playlist->queue.repeat << 28) ^
+		(playlist->queue.single << 29) ^
+		(playlist->queue.consume << 30) ^
+		(playlist->queue.random << 31);
+}