cue_parser: new line based CUE sheet parser

To replace libcue, the unmaintained and crashy library.

4 files changed, 385 insertions, 267 deletions

diff --git a/src/cue/cue_parser.c b/src/cue/cue_parser.c
new file mode 100644
index 00000000..034d4a1f
--- /dev/null
+++ b/src/cue/cue_parser.c
@@ -0,0 +1,327 @@
+/*
+ * 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 "cue_parser.h"
+#include "string_util.h"
+#include "song.h"
+#include "tag.h"
+
+#include <assert.h>
+#include <stdlib.h>
+
+struct cue_parser {
+	enum {
+		/**
+		 * Parsing the CUE header.
+		 */
+		HEADER,
+
+		/**
+		 * Parsing a "FILE ... WAVE".
+		 */
+		WAVE,
+
+		/**
+		 * Ignore everything until the next "FILE".
+		 */
+		IGNORE_FILE,
+
+		/**
+		 * Parsing a "TRACK ... AUDIO".
+		 */
+		TRACK,
+
+		/**
+		 * Ignore everything until the next "TRACK".
+		 */
+		IGNORE_TRACK,
+	} state;
+
+	struct tag *tag;
+
+	char *filename;
+
+	struct song *current, *previous, *finished;
+
+	bool last_updated;
+};
+
+struct cue_parser *
+cue_parser_new(void)
+{
+	struct cue_parser *parser = g_new(struct cue_parser, 1);
+	parser->state = HEADER;
+	parser->tag = tag_new();
+	parser->filename = NULL;
+	parser->current = NULL;
+	parser->previous = NULL;
+	parser->finished = NULL;
+	return parser;
+}
+
+void
+cue_parser_free(struct cue_parser *parser)
+{
+	tag_free(parser->tag);
+	g_free(parser->filename);
+
+	if (parser->current != NULL)
+		song_free(parser->current);
+
+	if (parser->finished != NULL)
+		song_free(parser->finished);
+
+	g_free(parser);
+}
+
+static const char *
+cue_next_word(char *p, char **pp)
+{
+	assert(p >= *pp);
+	assert(!g_ascii_isspace(*p));
+
+	const char *word = p;
+	while (*p != 0 && !g_ascii_isspace(*p))
+		++p;
+
+	*p = 0;
+	*pp = p + 1;
+	return word;
+}
+
+static const char *
+cue_next_quoted(char *p, char **pp)
+{
+	assert(p >= *pp);
+	assert(p[-1] == '"');
+
+	char *end = strchr(p, '"');
+	if (end == NULL) {
+		/* syntax error - ignore it silently */
+		*pp = p + strlen(p);
+		return p;
+	}
+
+	*end = 0;
+	*pp = end + 1;
+
+	return p;
+}
+
+static const char *
+cue_next_token(char **pp)
+{
+	char *p = strchug_fast(*pp);
+	if (*p == 0)
+		return NULL;
+
+	return cue_next_word(p, pp);
+}
+
+static const char *
+cue_next_value(char **pp)
+{
+	char *p = strchug_fast(*pp);
+	if (*p == 0)
+		return NULL;
+
+	if (*p == '"')
+		return cue_next_quoted(p + 1, pp);
+	else
+		return cue_next_word(p, pp);
+}
+
+static void
+cue_add_tag(struct tag *tag, enum tag_type type, char *p)
+{
+	const char *value = cue_next_value(&p);
+	if (value != NULL)
+		tag_add_item(tag, type, value);
+
+}
+
+static void
+cue_parse_rem(char *p, struct tag *tag)
+{
+	const char *type = cue_next_token(&p);
+	if (type == NULL)
+		return;
+
+	enum tag_type type2 = tag_name_parse_i(type);
+	if (type2 != TAG_NUM_OF_ITEM_TYPES)
+		cue_add_tag(tag, type2, p);
+}
+
+static struct tag *
+cue_current_tag(struct cue_parser *parser)
+{
+	if (parser->state == HEADER)
+		return parser->tag;
+	else if (parser->state == TRACK)
+		return parser->current->tag;
+	else
+		return NULL;
+}
+
+static int
+cue_parse_position(const char *p)
+{
+	char *endptr;
+	unsigned long minutes = strtoul(p, &endptr, 10);
+	if (endptr == p || *endptr != ':')
+		return -1;
+
+	p = endptr + 1;
+	unsigned long seconds = strtoul(p, &endptr, 10);
+	if (endptr == p || *endptr != ':')
+		return -1;
+
+	p = endptr + 1;
+	unsigned long frames = strtoul(p, &endptr, 10);
+	if (endptr == p || *endptr != 0)
+		return -1;
+
+	return minutes * 60000 + seconds * 1000 + frames * 1000 / 75;
+}
+
+static void
+cue_parser_feed2(struct cue_parser *parser, char *p)
+{
+	assert(parser != NULL);
+	assert(p != NULL);
+
+	const char *command = cue_next_token(&p);
+	if (command == NULL)
+		return;
+
+	if (strcmp(command, "REM") == 0) {
+		struct tag *tag = cue_current_tag(parser);
+		if (tag != NULL)
+			cue_parse_rem(p, tag);
+	} else if (strcmp(command, "PERFORMER") == 0) {
+		struct tag *tag = cue_current_tag(parser);
+		if (tag != NULL)
+			cue_add_tag(tag, TAG_PERFORMER, p);
+	} else if (strcmp(command, "TITLE") == 0) {
+		if (parser->state == HEADER)
+			cue_add_tag(parser->tag, TAG_ALBUM, p);
+		else if (parser->state == TRACK)
+			cue_add_tag(parser->current->tag, TAG_TITLE, p);
+	} else if (strcmp(command, "FILE") == 0) {
+		cue_parser_finish(parser);
+
+		const char *filename = cue_next_value(&p);
+		if (filename == NULL)
+			return;
+
+		const char *type = cue_next_token(&p);
+		if (type == NULL)
+			return;
+
+		if (strcmp(type, "WAVE") != 0) {
+			parser->state = IGNORE_FILE;
+			return;
+		}
+
+		parser->state = WAVE;
+		g_free(parser->filename);
+		parser->filename = g_strdup(filename);
+	} else if (parser->state == IGNORE_FILE) {
+		return;
+	} else if (strcmp(command, "TRACK") == 0) {
+		cue_parser_finish(parser);
+
+		const char *nr = cue_next_token(&p);
+		if (nr == NULL)
+			return;
+
+		const char *type = cue_next_token(&p);
+		if (type == NULL)
+			return;
+
+		if (strcmp(type, "AUDIO") != 0) {
+			parser->state = IGNORE_TRACK;
+			return;
+		}
+
+		parser->state = TRACK;
+		parser->current = song_remote_new(parser->filename);
+		assert(parser->current->tag == NULL);
+		parser->current->tag = tag_dup(parser->tag);
+		tag_add_item(parser->current->tag, TAG_TRACK, nr);
+		parser->last_updated = false;
+	} else if (parser->state == IGNORE_TRACK) {
+		return;
+	} else if (parser->state == TRACK && strcmp(command, "INDEX") == 0) {
+		const char *nr = cue_next_token(&p);
+		if (nr == NULL)
+			return;
+
+		const char *position = cue_next_token(&p);
+		if (position == NULL)
+			return;
+
+		int position_ms = cue_parse_position(position);
+		if (position_ms < 0)
+			return;
+
+		if (!parser->last_updated && parser->previous != NULL &&
+		    parser->previous->start_ms < (unsigned)position_ms) {
+			parser->last_updated = true;
+			parser->previous->end_ms = position_ms;
+			parser->previous->tag->time =
+				(parser->previous->end_ms - parser->previous->start_ms + 500) / 1000;
+		}
+
+		parser->current->start_ms = position_ms;
+	}
+}
+
+void
+cue_parser_feed(struct cue_parser *parser, const char *line)
+{
+	assert(parser != NULL);
+	assert(line != NULL);
+
+	char *allocated = g_strdup(line);
+	cue_parser_feed2(parser, allocated);
+	g_free(allocated);
+}
+
+void
+cue_parser_finish(struct cue_parser *parser)
+{
+	if (parser->finished != NULL)
+		song_free(parser->finished);
+
+	parser->finished = parser->previous;
+	parser->previous = parser->current;
+	parser->current = NULL;
+}
+
+struct song *
+cue_parser_get(struct cue_parser *parser)
+{
+	assert(parser != NULL);
+
+	struct song *song = parser->finished;
+	parser->finished = NULL;
+	return song;
+}
diff --git a/src/cue/cue_parser.h b/src/cue/cue_parser.h
new file mode 100644
index 00000000..d8d69573
--- /dev/null
+++ b/src/cue/cue_parser.h
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ */
+
+#ifndef MPD_CUE_PARSER_H
+#define MPD_CUE_PARSER_H
+
+#include "check.h"
+
+#include <stdbool.h>
+
+struct cue_parser *
+cue_parser_new(void);
+
+void
+cue_parser_free(struct cue_parser *parser);
+
+/**
+ * Feed a text line from the CUE file into the parser.  Call
+ * cue_parser_get() after this to see if a song has been finished.
+ */
+void
+cue_parser_feed(struct cue_parser *parser, const char *line);
+
+/**
+ * Tell the parser that the end of the file has been reached.  Call
+ * cue_parser_get() after this to see if a song has been finished.
+ * This procedure must be done twice!
+ */
+void
+cue_parser_finish(struct cue_parser *parser);
+
+/**
+ * Check if a song was finished by the last cue_parser_feed() or
+ * cue_parser_finish() call.
+ *
+ * @return a song object that must be freed by the caller, or NULL if
+ * no song was finished at this time
+ */
+struct song *
+cue_parser_get(struct cue_parser *parser);
+
+#endif
diff --git a/src/cue/cue_tag.c b/src/cue/cue_tag.c
deleted file mode 100644
index 6ee38bbd..00000000
--- a/src/cue/cue_tag.c
+++ /dev/null
@@ -1,244 +0,0 @@
-#include "config.h"
-#include "cue_tag.h"
-#include "tag.h"
-
-#include <libcue/libcue.h>
-#include <assert.h>
-
-static struct tag *
-cue_tag_cd(struct Cdtext *cdtext, struct Rem *rem)
-{
-	struct tag *tag;
-	char *tmp;
-
-	assert(cdtext != NULL);
-
-	tag = tag_new();
-
-	tag_begin_add(tag);
-
-	/* TAG_ALBUM_ARTIST */
-	if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_SONGWRITER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_ARRANGER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
-
-	/* TAG_ARTIST */
-	if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_SONGWRITER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_ARRANGER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	/* TAG_PERFORMER */
-	if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_PERFORMER, tmp);
-
-	/* TAG_COMPOSER */
-	if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_COMPOSER, tmp);
-
-	/* TAG_ALBUM */
-	if ((tmp = cdtext_get(PTI_TITLE, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ALBUM, tmp);
-
-	/* TAG_GENRE */
-	if ((tmp = cdtext_get(PTI_GENRE, cdtext)) != NULL)
-		tag_add_item(tag, TAG_GENRE, tmp);
-
-	/* TAG_DATE */
-	if ((tmp = rem_get(REM_DATE, rem)) != NULL)
-		tag_add_item(tag, TAG_DATE, tmp);
-
-	/* TAG_COMMENT */
-	if ((tmp = cdtext_get(PTI_MESSAGE, cdtext)) != NULL)
-		tag_add_item(tag, TAG_COMMENT, tmp);
-
-	/* TAG_DISC */
-	if ((tmp = cdtext_get(PTI_DISC_ID, cdtext)) != NULL)
-		tag_add_item(tag, TAG_DISC, tmp);
-
-	/* stream name, usually empty
-	 * tag_add_item(tag, TAG_NAME,);
-	 */
-
-	/* REM MUSICBRAINZ entry?
-	tag_add_item(tag, TAG_MUSICBRAINZ_ARTISTID,);
-	tag_add_item(tag, TAG_MUSICBRAINZ_ALBUMID,);
-	tag_add_item(tag, TAG_MUSICBRAINZ_ALBUMARTISTID,);
-	tag_add_item(tag, TAG_MUSICBRAINZ_TRACKID,);
-	*/
-
-	tag_end_add(tag);
-
-	if (tag_is_empty(tag)) {
-		tag_free(tag);
-		return NULL;
-	}
-
-	return tag;
-}
-
-static struct tag *
-cue_tag_track(struct Cdtext *cdtext, struct Rem *rem)
-{
-	struct tag *tag;
-	char *tmp;
-
-	assert(cdtext != NULL);
-
-	tag = tag_new();
-
-	tag_begin_add(tag);
-
-	/* TAG_ARTIST */
-	if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_SONGWRITER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	else if ((tmp = cdtext_get(PTI_ARRANGER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_ARTIST, tmp);
-
-	/* TAG_TITLE */
-	if ((tmp = cdtext_get(PTI_TITLE, cdtext)) != NULL)
-		tag_add_item(tag, TAG_TITLE, tmp);
-
-	/* TAG_GENRE */
-	if ((tmp = cdtext_get(PTI_GENRE, cdtext)) != NULL)
-		tag_add_item(tag, TAG_GENRE, tmp);
-
-	/* TAG_DATE */
-	if ((tmp = rem_get(REM_DATE, rem)) != NULL)
-		tag_add_item(tag, TAG_DATE, tmp);
-
-	/* TAG_COMPOSER */
-	if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_COMPOSER, tmp);
-
-	/* TAG_PERFORMER */
-	if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
-		tag_add_item(tag, TAG_PERFORMER, tmp);
-
-	/* TAG_COMMENT */
-	if ((tmp = cdtext_get(PTI_MESSAGE, cdtext)) != NULL)
-		tag_add_item(tag, TAG_COMMENT, tmp);
-
-	/* TAG_DISC */
-	if ((tmp = cdtext_get(PTI_DISC_ID, cdtext)) != NULL)
-		tag_add_item(tag, TAG_DISC, tmp);
-
-	tag_end_add(tag);
-
-	if (tag_is_empty(tag)) {
-		tag_free(tag);
-		return NULL;
-	}
-
-	return tag;
-}
-
-struct tag *
-cue_tag(struct Cd *cd, unsigned tnum)
-{
-	struct tag *cd_tag, *track_tag, *tag;
-	struct Track *track;
-
-	assert(cd != NULL);
-
-	track = cd_get_track(cd, tnum);
-	if (track == NULL)
-		return NULL;
-
-	/* tag from CDtext info */
-	cd_tag = cue_tag_cd(cd_get_cdtext(cd), cd_get_rem(cd));
-
-	/* tag from TRACKtext info */
-	track_tag = cue_tag_track(track_get_cdtext(track),
-				  track_get_rem(track));
-
-	tag = tag_merge_replace(cd_tag, track_tag);
-	if (tag == NULL)
-		return NULL;
-
-	/* Create a tag number */
-
-	tag_clear_items_by_type(tag, TAG_TRACK);
-
-	char convert_uinttostring[8];
-	snprintf(convert_uinttostring, sizeof(convert_uinttostring),
-		 "%02d/%02d", tnum, cd_get_ntrack(cd));
-	tag_add_item(tag, TAG_TRACK, convert_uinttostring);
-
-	tag->time = track_get_length(track)
-	    - track_get_index(track, 1)
-	    + track_get_zero_pre(track);
-	track = cd_get_track(cd, tnum + 1);
-	if (track != NULL)
-		tag->time += track_get_index(track, 1)
-		    - track_get_zero_pre(track);
-	/* libcue returns the track duration in frames, and there are
-	   75 frames per second; this formula rounds down */
-	tag->time = tag->time / 75;
-
-	return tag;
-}
-
-struct tag *
-cue_tag_file(FILE *fp, unsigned tnum)
-{
-	struct Cd *cd;
-	struct tag *tag;
-
-	assert(fp != NULL);
-
-	if (tnum > 256)
-		return NULL;
-
-	cd = cue_parse_file(fp);
-	if (cd == NULL)
-		return NULL;
-
-	tag = cue_tag(cd, tnum);
-	cd_delete(cd);
-
-	return tag;
-}
-
-struct tag *
-cue_tag_string(const char *str, unsigned tnum)
-{
-	struct Cd *cd;
-	struct tag *tag;
-
-	assert(str != NULL);
-
-	if (tnum > 256)
-		return NULL;
-
-	cd = cue_parse_string(str);
-	if (cd == NULL)
-		return NULL;
-
-	tag = cue_tag(cd, tnum);
-	cd_delete(cd);
-
-	return tag;
-}
diff --git a/src/cue/cue_tag.h b/src/cue/cue_tag.h
deleted file mode 100644
index 1ddaa59c..00000000
--- a/src/cue/cue_tag.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#ifndef MPD_CUE_TAG_H
-#define MPD_CUE_TAG_H
-
-#include "check.h"
-
-#ifdef HAVE_CUE /* libcue */
-
-#include <stdio.h>
-
-struct tag;
-struct Cd;
-
-struct tag *
-cue_tag(struct Cd *cd, unsigned tnum);
-
-struct tag *
-cue_tag_file(FILE *file, unsigned tnum);
-
-struct tag *
-cue_tag_string(const char *str, unsigned tnum);
-
-#endif /* libcue */
-#endif