decoder/{vorbis,flac}: move duplicate code to tag/VorbisComment.cxx

Makefile.am

@@ -766,6 +766,7 @@ libtag_a_SOURCES =\
 	src/tag/TagPool.cxx src/tag/TagPool.hxx \
 	src/tag/TagTable.cxx src/tag/TagTable.hxx \
 	src/tag/Set.cxx src/tag/Set.hxx \
+	src/tag/VorbisComment.cxx src/tag/VorbisComment.hxx \
 	src/tag/ReplayGain.cxx src/tag/ReplayGain.hxx \
 	src/tag/ApeLoader.cxx src/tag/ApeLoader.hxx \
 	src/tag/ApeReplayGain.cxx src/tag/ApeReplayGain.hxx \

src/decoder/plugins/FlacMetadata.cxx

@@ -25,6 +25,7 @@
 #include "tag/TagTable.hxx"
 #include "tag/TagBuilder.hxx"
 #include "tag/Tag.hxx"
+#include "tag/VorbisComment.hxx"
 #include "ReplayGainInfo.hxx"
 #include "util/ASCII.hxx"
 #include "util/SplitString.hxx"
@@ -114,17 +115,7 @@ static const char *
 flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
 		   const char *name)
 {
-	size_t name_length = strlen(name);
-	const char *comment = (const char*)entry->entry;
-
-	if (!StringEqualsCaseASCII(comment, name, name_length))
-		return nullptr;
-
-	if (comment[name_length] == '=') {
-		return comment + name_length + 1;
-	}
-
-	return nullptr;
+	return vorbis_comment_value((const char *)entry->entry, name);
 }
 
 /**

src/decoder/plugins/VorbisComments.cxx

@@ -23,26 +23,14 @@
 #include "tag/TagTable.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/TagBuilder.hxx"
+#include "tag/VorbisComment.hxx"
 #include "ReplayGainInfo.hxx"
 #include "util/ASCII.hxx"
 #include "util/SplitString.hxx"
 
 #include <stddef.h>
-#include <string.h>
 #include <stdlib.h>
 
-static const char *
-vorbis_comment_value(const char *comment, const char *needle)
-{
-	size_t len = strlen(needle);
-
-	if (StringEqualsCaseASCII(comment, needle, len) &&
-	    comment[len] == '=')
-		return comment + len + 1;
-
-	return nullptr;
-}
-
 bool
 vorbis_comments_to_replay_gain(ReplayGainInfo &rgi, char **comments)
 {

src/tag/VorbisComment.cxx

+/*
+ * Copyright (C) 2003-2014 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 "VorbisComment.hxx"
+#include "util/ASCII.hxx"
+
+#include <assert.h>
+#include <string.h>
+
+const char *
+vorbis_comment_value(const char *entry, const char *name)
+{
+	assert(entry != nullptr);
+	assert(name != nullptr);
+	assert(*name != 0);
+
+	const size_t length = strlen(name);
+
+	if (StringEqualsCaseASCII(entry, name, length) &&
+	    entry[length] == '=')
+		return entry + length + 1;
+
+	return nullptr;
+}

src/tag/VorbisComment.hxx

+/*
+ * Copyright (C) 2003-2014 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_TAG_VORBIS_COMMENT_HXX
+#define MPD_TAG_VORBIS_COMMENT_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+/**
+ * Checks if the specified name matches the entry's name, and if yes,
+ * returns the comment value.
+ */
+gcc_pure
+const char *
+vorbis_comment_value(const char *entry, const char *name);
+
+#endif