Tag: move fix_tag_value() to TagString.cxx

3 files changed, 160 insertions, 102 deletions

diff --git a/src/tag/Tag.cxx b/src/tag/Tag.cxx
index 20711f1cc..d0e44862d 100644
--- a/src/tag/Tag.cxx
+++ b/src/tag/Tag.cxx
@@ -21,6 +21,7 @@
 #include "Tag.hxx"
 #include "TagInternal.hxx"
 #include "TagPool.hxx"
+#include "TagString.hxx"
 
 #include <glib.h>
 #include <assert.h>
@@ -216,48 +217,6 @@ Tag::HasType(tag_type type) const
 	return GetValue(type) != nullptr;
 }
 
-/**
- * Replace invalid sequences with the question mark.
- */
-static char *
-patch_utf8(const char *src, size_t length, const gchar *end)
-{
-	/* duplicate the string, and replace invalid bytes in that
-	   buffer */
-	char *dest = g_strdup(src);
-
-	do {
-		dest[end - src] = '?';
-	} while (!g_utf8_validate(end + 1, (src + length) - (end + 1), &end));
-
-	return dest;
-}
-
-static char *
-fix_utf8(const char *str, size_t length)
-{
-	const gchar *end;
-	char *temp;
-	gsize written;
-
-	assert(str != nullptr);
-
-	/* check if the string is already valid UTF-8 */
-	if (g_utf8_validate(str, length, &end))
-		return nullptr;
-
-	/* no, it's not - try to import it from ISO-Latin-1 */
-	temp = g_convert(str, length, "utf-8", "iso-8859-1",
-			 nullptr, &written, nullptr);
-	if (temp != nullptr)
-		/* success! */
-		return temp;
-
-	/* no, still broken - there's no medication, just patch
-	   invalid sequences */
-	return patch_utf8(str, length, end);
-}
-
 void
 Tag::BeginAdd()
 {
@@ -292,71 +251,12 @@ Tag::EndAdd()
 #endif
 }
 
-static bool
-char_is_non_printable(unsigned char ch)
-{
-	return ch < 0x20;
-}
-
-static const char *
-find_non_printable(const char *p, size_t length)
-{
-	for (size_t i = 0; i < length; ++i)
-		if (char_is_non_printable(p[i]))
-			return p + i;
-
-	return nullptr;
-}
-
-/**
- * Clears all non-printable characters, convert them to space.
- * Returns nullptr if nothing needs to be cleared.
- */
-static char *
-clear_non_printable(const char *p, size_t length)
-{
-	const char *first = find_non_printable(p, length);
-	char *dest;
-
-	if (first == nullptr)
-		return nullptr;
-
-	dest = g_strndup(p, length);
-
-	for (size_t i = first - p; i < length; ++i)
-		if (char_is_non_printable(dest[i]))
-			dest[i] = ' ';
-
-	return dest;
-}
-
-static char *
-fix_tag_value(const char *p, size_t length)
-{
-	char *utf8, *cleared;
-
-	utf8 = fix_utf8(p, length);
-	if (utf8 != nullptr) {
-		p = utf8;
-		length = strlen(p);
-	}
-
-	cleared = clear_non_printable(p, length);
-	if (cleared == nullptr)
-		cleared = utf8;
-	else
-		g_free(utf8);
-
-	return cleared;
-}
-
 void
 Tag::AddItemInternal(tag_type type, const char *value, size_t len)
 {
 	unsigned int i = num_items;
-	char *p;
 
-	p = fix_tag_value(value, len);
+	char *p = FixTagString(value, len);
 	if (p != nullptr) {
 		value = p;
 		len = strlen(value);
diff --git a/src/tag/TagString.cxx b/src/tag/TagString.cxx
new file mode 100644
index 000000000..3e8d8c1b0
--- /dev/null
+++ b/src/tag/TagString.cxx
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2003-2013 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 "TagString.hxx"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+/**
+ * Replace invalid sequences with the question mark.
+ */
+static char *
+patch_utf8(const char *src, size_t length, const gchar *end)
+{
+	/* duplicate the string, and replace invalid bytes in that
+	   buffer */
+	char *dest = g_strdup(src);
+
+	do {
+		dest[end - src] = '?';
+	} while (!g_utf8_validate(end + 1, (src + length) - (end + 1), &end));
+
+	return dest;
+}
+
+static char *
+fix_utf8(const char *str, size_t length)
+{
+	const gchar *end;
+	char *temp;
+	gsize written;
+
+	assert(str != nullptr);
+
+	/* check if the string is already valid UTF-8 */
+	if (g_utf8_validate(str, length, &end))
+		return nullptr;
+
+	/* no, it's not - try to import it from ISO-Latin-1 */
+	temp = g_convert(str, length, "utf-8", "iso-8859-1",
+			 nullptr, &written, nullptr);
+	if (temp != nullptr)
+		/* success! */
+		return temp;
+
+	/* no, still broken - there's no medication, just patch
+	   invalid sequences */
+	return patch_utf8(str, length, end);
+}
+
+static bool
+char_is_non_printable(unsigned char ch)
+{
+	return ch < 0x20;
+}
+
+static const char *
+find_non_printable(const char *p, size_t length)
+{
+	for (size_t i = 0; i < length; ++i)
+		if (char_is_non_printable(p[i]))
+			return p + i;
+
+	return nullptr;
+}
+
+/**
+ * Clears all non-printable characters, convert them to space.
+ * Returns nullptr if nothing needs to be cleared.
+ */
+static char *
+clear_non_printable(const char *p, size_t length)
+{
+	const char *first = find_non_printable(p, length);
+	char *dest;
+
+	if (first == nullptr)
+		return nullptr;
+
+	dest = g_strndup(p, length);
+
+	for (size_t i = first - p; i < length; ++i)
+		if (char_is_non_printable(dest[i]))
+			dest[i] = ' ';
+
+	return dest;
+}
+
+char *
+FixTagString(const char *p, size_t length)
+{
+	char *utf8, *cleared;
+
+	utf8 = fix_utf8(p, length);
+	if (utf8 != nullptr) {
+		p = utf8;
+		length = strlen(p);
+	}
+
+	cleared = clear_non_printable(p, length);
+	if (cleared == nullptr)
+		cleared = utf8;
+	else
+		g_free(utf8);
+
+	return cleared;
+}
diff --git a/src/tag/TagString.hxx b/src/tag/TagString.hxx
new file mode 100644
index 000000000..21ea139bf
--- /dev/null
+++ b/src/tag/TagString.hxx
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2003-2013 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_STRING_HXX
+#define MPD_TAG_STRING_HXX
+
+#include "check.h"
+#include "gcc.h"
+
+#include <stddef.h>
+
+gcc_malloc gcc_nonnull_all
+char *
+FixTagString(const char *p, size_t length);
+
+#endif