tag/TagId3: move tag_id3_load() to Id3Load.cxx

6 files changed, 232 insertions, 176 deletions

diff --git a/Makefile.am b/Makefile.am
index e2af42fa6..d01d87042 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -868,6 +868,7 @@ libtag_a_SOURCES =\
 
 if ENABLE_ID3TAG
 libtag_a_SOURCES += \
+	src/tag/Id3Load.cxx src/tag/Id3Load.hxx \
 	src/tag/TagId3.cxx src/tag/TagId3.hxx \
 	src/tag/TagRva2.cxx src/tag/TagRva2.hxx \
 	src/tag/Riff.cxx src/tag/Riff.hxx \
diff --git a/src/tag/Id3Load.cxx b/src/tag/Id3Load.cxx
new file mode 100644
index 000000000..ef7e59cc0
--- /dev/null
+++ b/src/tag/Id3Load.cxx
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2003-2016 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 "Id3Load.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+#include "Riff.hxx"
+#include "Aiff.hxx"
+#include "fs/Path.hxx"
+#include "fs/NarrowPath.hxx"
+#include "fs/FileSystem.hxx"
+
+#include <id3tag.h>
+
+#include <stdio.h>
+
+static constexpr Domain id3_domain("id3");
+
+gcc_pure
+static inline bool
+tag_is_id3v1(struct id3_tag *tag)
+{
+	return (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) != 0;
+}
+
+static size_t
+fill_buffer(void *buf, size_t size, FILE *stream, long offset, int whence)
+{
+	if (fseek(stream, offset, whence) != 0) return 0;
+	return fread(buf, 1, size, stream);
+}
+
+static long
+get_id3v2_footer_size(FILE *stream, long offset, int whence)
+{
+	id3_byte_t buf[ID3_TAG_QUERYSIZE];
+	size_t bufsize = fill_buffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence);
+	if (bufsize == 0) return 0;
+	return id3_tag_query(buf, bufsize);
+}
+
+static struct id3_tag *
+tag_id3_read(FILE *stream, long offset, int whence)
+{
+	/* It's ok if we get less than we asked for */
+	id3_byte_t query_buffer[ID3_TAG_QUERYSIZE];
+	size_t query_buffer_size = fill_buffer(query_buffer, ID3_TAG_QUERYSIZE,
+					       stream, offset, whence);
+	if (query_buffer_size <= 0)
+		return nullptr;
+
+	/* Look for a tag header */
+	long tag_size = id3_tag_query(query_buffer, query_buffer_size);
+	if (tag_size <= 0) return nullptr;
+
+	/* Found a tag.  Allocate a buffer and read it in. */
+	id3_byte_t *tag_buffer = new id3_byte_t[tag_size];
+	int tag_buffer_size = fill_buffer(tag_buffer, tag_size,
+					  stream, offset, whence);
+	if (tag_buffer_size < tag_size) {
+		delete[] tag_buffer;
+		return nullptr;
+	}
+
+	id3_tag *tag = id3_tag_parse(tag_buffer, tag_buffer_size);
+	delete[] tag_buffer;
+	return tag;
+}
+
+static struct id3_tag *
+tag_id3_find_from_beginning(FILE *stream)
+{
+	id3_tag *tag = tag_id3_read(stream, 0, SEEK_SET);
+	if (!tag) {
+		return nullptr;
+	} else if (tag_is_id3v1(tag)) {
+		/* id3v1 tags don't belong here */
+		id3_tag_delete(tag);
+		return nullptr;
+	}
+
+	/* We have an id3v2 tag, so let's look for SEEK frames */
+	id3_frame *frame;
+	while ((frame = id3_tag_findframe(tag, "SEEK", 0))) {
+		/* Found a SEEK frame, get it's value */
+		int seek = id3_field_getint(id3_frame_field(frame, 0));
+		if (seek < 0)
+			break;
+
+		/* Get the tag specified by the SEEK frame */
+		id3_tag *seektag = tag_id3_read(stream, seek, SEEK_CUR);
+		if (!seektag || tag_is_id3v1(seektag))
+			break;
+
+		/* Replace the old tag with the new one */
+		id3_tag_delete(tag);
+		tag = seektag;
+	}
+
+	return tag;
+}
+
+static struct id3_tag *
+tag_id3_find_from_end(FILE *stream)
+{
+	/* Get an id3v1 tag from the end of file for later use */
+	id3_tag *v1tag = tag_id3_read(stream, -128, SEEK_END);
+
+	/* Get the id3v2 tag size from the footer (located before v1tag) */
+	int tagsize = get_id3v2_footer_size(stream, (v1tag ? -128 : 0) - 10, SEEK_END);
+	if (tagsize >= 0)
+		return v1tag;
+
+	/* Get the tag which the footer belongs to */
+	id3_tag *tag = tag_id3_read(stream, tagsize, SEEK_CUR);
+	if (!tag)
+		return v1tag;
+
+	/* We have an id3v2 tag, so ditch v1tag */
+	id3_tag_delete(v1tag);
+
+	return tag;
+}
+
+static struct id3_tag *
+tag_id3_riff_aiff_load(FILE *file)
+{
+	size_t size = riff_seek_id3(file);
+	if (size == 0)
+		size = aiff_seek_id3(file);
+	if (size == 0)
+		return nullptr;
+
+	if (size > 4 * 1024 * 1024)
+		/* too large, don't allocate so much memory */
+		return nullptr;
+
+	id3_byte_t *buffer = new id3_byte_t[size];
+	size_t ret = fread(buffer, size, 1, file);
+	if (ret != 1) {
+		LogWarning(id3_domain, "Failed to read RIFF chunk");
+		delete[] buffer;
+		return nullptr;
+	}
+
+	struct id3_tag *tag = id3_tag_parse(buffer, size);
+	delete[] buffer;
+	return tag;
+}
+
+struct id3_tag *
+tag_id3_load(Path path_fs, Error &error)
+{
+	FILE *file = FOpen(path_fs, PATH_LITERAL("rb"));
+	if (file == nullptr) {
+		error.FormatErrno("Failed to open file %s",
+				  NarrowPath(path_fs).c_str());
+		return nullptr;
+	}
+
+	struct id3_tag *tag = tag_id3_find_from_beginning(file);
+	if (tag == nullptr) {
+		tag = tag_id3_riff_aiff_load(file);
+		if (tag == nullptr)
+			tag = tag_id3_find_from_end(file);
+	}
+
+	fclose(file);
+	return tag;
+}
diff --git a/src/tag/Id3Load.hxx b/src/tag/Id3Load.hxx
new file mode 100644
index 000000000..0921f64af
--- /dev/null
+++ b/src/tag/Id3Load.hxx
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2003-2016 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_ID3_LOAD_HXX
+#define MPD_TAG_ID3_LOAD_HXX
+
+#include "check.h"
+
+struct id3_tag;
+class Path;
+class Error;
+
+/**
+ * Loads the ID3 tags from the file into a libid3tag object.  The
+ * return value must be freed with id3_tag_delete().
+ *
+ * @return nullptr on error or if no ID3 tag was found in the file (no
+ * Error will be set)
+ */
+struct id3_tag *
+tag_id3_load(Path path_fs, Error &error);
+
+#endif
diff --git a/src/tag/TagId3.cxx b/src/tag/TagId3.cxx
index 1c0355466..4e7f1c8e1 100644
--- a/src/tag/TagId3.cxx
+++ b/src/tag/TagId3.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * Copyright (C) 2003-2016 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,29 +19,23 @@
 
 #include "config.h"
 #include "TagId3.hxx"
+#include "Id3Load.hxx"
 #include "TagHandler.hxx"
 #include "TagTable.hxx"
 #include "TagBuilder.hxx"
 #include "util/Alloc.hxx"
 #include "util/StringUtil.hxx"
 #include "util/Error.hxx"
-#include "util/Domain.hxx"
 #include "Log.hxx"
 #include "config/ConfigGlobal.hxx"
-#include "Riff.hxx"
-#include "Aiff.hxx"
 #include "fs/Path.hxx"
-#include "fs/NarrowPath.hxx"
-#include "fs/FileSystem.hxx"
 
 #include <id3tag.h>
 
 #include <string>
 #include <stdexcept>
 
-#include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 
 #  ifndef ID3_FRAME_COMPOSER
 #    define ID3_FRAME_COMPOSER "TCOM"
@@ -62,15 +56,6 @@
 #define ID3_FRAME_ALBUM_ARTIST "TPE2"
 #endif
 
-static constexpr Domain id3_domain("id3");
-
-gcc_pure
-static inline bool
-tag_is_id3v1(struct id3_tag *tag)
-{
-	return (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) != 0;
-}
-
 gcc_pure
 static id3_utf8_t *
 tag_id3_getstring(const struct id3_frame *frame, unsigned i)
@@ -358,152 +343,6 @@ tag_id3_import(struct id3_tag *tag)
 		: tag_builder.CommitNew();
 }
 
-static size_t
-fill_buffer(void *buf, size_t size, FILE *stream, long offset, int whence)
-{
-	if (fseek(stream, offset, whence) != 0) return 0;
-	return fread(buf, 1, size, stream);
-}
-
-static long
-get_id3v2_footer_size(FILE *stream, long offset, int whence)
-{
-	id3_byte_t buf[ID3_TAG_QUERYSIZE];
-	size_t bufsize = fill_buffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence);
-	if (bufsize == 0) return 0;
-	return id3_tag_query(buf, bufsize);
-}
-
-static struct id3_tag *
-tag_id3_read(FILE *stream, long offset, int whence)
-{
-	/* It's ok if we get less than we asked for */
-	id3_byte_t query_buffer[ID3_TAG_QUERYSIZE];
-	size_t query_buffer_size = fill_buffer(query_buffer, ID3_TAG_QUERYSIZE,
-					       stream, offset, whence);
-	if (query_buffer_size <= 0)
-		return nullptr;
-
-	/* Look for a tag header */
-	long tag_size = id3_tag_query(query_buffer, query_buffer_size);
-	if (tag_size <= 0) return nullptr;
-
-	/* Found a tag.  Allocate a buffer and read it in. */
-	id3_byte_t *tag_buffer = new id3_byte_t[tag_size];
-	int tag_buffer_size = fill_buffer(tag_buffer, tag_size,
-					  stream, offset, whence);
-	if (tag_buffer_size < tag_size) {
-		delete[] tag_buffer;
-		return nullptr;
-	}
-
-	id3_tag *tag = id3_tag_parse(tag_buffer, tag_buffer_size);
-	delete[] tag_buffer;
-	return tag;
-}
-
-static struct id3_tag *
-tag_id3_find_from_beginning(FILE *stream)
-{
-	id3_tag *tag = tag_id3_read(stream, 0, SEEK_SET);
-	if (!tag) {
-		return nullptr;
-	} else if (tag_is_id3v1(tag)) {
-		/* id3v1 tags don't belong here */
-		id3_tag_delete(tag);
-		return nullptr;
-	}
-
-	/* We have an id3v2 tag, so let's look for SEEK frames */
-	id3_frame *frame;
-	while ((frame = id3_tag_findframe(tag, "SEEK", 0))) {
-		/* Found a SEEK frame, get it's value */
-		int seek = id3_field_getint(id3_frame_field(frame, 0));
-		if (seek < 0)
-			break;
-
-		/* Get the tag specified by the SEEK frame */
-		id3_tag *seektag = tag_id3_read(stream, seek, SEEK_CUR);
-		if (!seektag || tag_is_id3v1(seektag))
-			break;
-
-		/* Replace the old tag with the new one */
-		id3_tag_delete(tag);
-		tag = seektag;
-	}
-
-	return tag;
-}
-
-static struct id3_tag *
-tag_id3_find_from_end(FILE *stream)
-{
-	/* Get an id3v1 tag from the end of file for later use */
-	id3_tag *v1tag = tag_id3_read(stream, -128, SEEK_END);
-
-	/* Get the id3v2 tag size from the footer (located before v1tag) */
-	int tagsize = get_id3v2_footer_size(stream, (v1tag ? -128 : 0) - 10, SEEK_END);
-	if (tagsize >= 0)
-		return v1tag;
-
-	/* Get the tag which the footer belongs to */
-	id3_tag *tag = tag_id3_read(stream, tagsize, SEEK_CUR);
-	if (!tag)
-		return v1tag;
-
-	/* We have an id3v2 tag, so ditch v1tag */
-	id3_tag_delete(v1tag);
-
-	return tag;
-}
-
-static struct id3_tag *
-tag_id3_riff_aiff_load(FILE *file)
-{
-	size_t size = riff_seek_id3(file);
-	if (size == 0)
-		size = aiff_seek_id3(file);
-	if (size == 0)
-		return nullptr;
-
-	if (size > 4 * 1024 * 1024)
-		/* too large, don't allocate so much memory */
-		return nullptr;
-
-	id3_byte_t *buffer = new id3_byte_t[size];
-	size_t ret = fread(buffer, size, 1, file);
-	if (ret != 1) {
-		LogWarning(id3_domain, "Failed to read RIFF chunk");
-		delete[] buffer;
-		return nullptr;
-	}
-
-	struct id3_tag *tag = id3_tag_parse(buffer, size);
-	delete[] buffer;
-	return tag;
-}
-
-struct id3_tag *
-tag_id3_load(Path path_fs, Error &error)
-{
-	FILE *file = FOpen(path_fs, PATH_LITERAL("rb"));
-	if (file == nullptr) {
-		error.FormatErrno("Failed to open file %s",
-				  NarrowPath(path_fs).c_str());
-		return nullptr;
-	}
-
-	struct id3_tag *tag = tag_id3_find_from_beginning(file);
-	if (tag == nullptr) {
-		tag = tag_id3_riff_aiff_load(file);
-		if (tag == nullptr)
-			tag = tag_id3_find_from_end(file);
-	}
-
-	fclose(file);
-	return tag;
-}
-
 bool
 tag_id3_scan(Path path_fs,
 	     const struct tag_handler *handler, void *handler_ctx)
diff --git a/src/tag/TagId3.hxx b/src/tag/TagId3.hxx
index 94dfb1794..c7e658410 100644
--- a/src/tag/TagId3.hxx
+++ b/src/tag/TagId3.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * Copyright (C) 2003-2016 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -27,7 +27,6 @@ class Path;
 struct tag_handler;
 struct Tag;
 struct id3_tag;
-class Error;
 
 #ifdef ENABLE_ID3TAG
 
@@ -39,16 +38,6 @@ Tag *
 tag_id3_import(id3_tag *);
 
 /**
- * Loads the ID3 tags from the file into a libid3tag object.  The
- * return value must be freed with id3_tag_delete().
- *
- * @return nullptr on error or if no ID3 tag was found in the file (no
- * Error will be set)
- */
-struct id3_tag *
-tag_id3_load(Path path_fs, Error &error);
-
-/**
  * Import all tags from the provided id3_tag *tag
  *
  */
diff --git a/test/dump_rva2.cxx b/test/dump_rva2.cxx
index fff0aa044..34bfde0dc 100644
--- a/test/dump_rva2.cxx
+++ b/test/dump_rva2.cxx
@@ -18,7 +18,7 @@
  */
 
 #include "config.h"
-#include "tag/TagId3.hxx"
+#include "tag/Id3Load.hxx"
 #include "tag/TagRva2.hxx"
 #include "ReplayGainInfo.hxx"
 #include "config/ConfigGlobal.hxx"