Path: move to fs subdirectory

2 files changed, 395 insertions, 0 deletions

diff --git a/src/fs/Path.cxx b/src/fs/Path.cxx
new file mode 100644
index 00000000..80b41cba
--- /dev/null
+++ b/src/fs/Path.cxx
@@ -0,0 +1,131 @@
+/*
+ * 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 "fs/Path.hxx"
+#include "conf.h"
+#include "mpd_error.h"
+#include "gcc.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef G_OS_WIN32
+#include <windows.h> // for GetACP()
+#include <stdio.h> // for sprintf()
+#endif
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "path"
+
+static char *fs_charset;
+
+char *
+fs_charset_to_utf8(const char *path_fs)
+{
+	return g_convert(path_fs, -1,
+			 "utf-8", fs_charset,
+			 NULL, NULL, NULL);
+}
+
+char *
+utf8_to_fs_charset(const char *path_utf8)
+{
+	gchar *p;
+
+	p = g_convert(path_utf8, -1,
+		      fs_charset, "utf-8",
+		      NULL, NULL, NULL);
+	if (p == NULL)
+		/* fall back to UTF-8 */
+		p = g_strdup(path_utf8);
+
+	return p;
+}
+
+gcc_pure
+static bool
+IsSupportedCharset(const char *charset)
+{
+	/* convert a space to check if the charset is valid */
+	char *test = g_convert(" ", 1, charset, "UTF-8", NULL, NULL, NULL);
+	if (test == NULL)
+		return false;
+
+	g_free(test);
+	return true;
+}
+
+static void
+path_set_fs_charset(const char *charset)
+{
+	assert(charset != NULL);
+
+	if (!IsSupportedCharset(charset))
+		MPD_ERROR("invalid filesystem charset: %s", charset);
+
+	g_free(fs_charset);
+	fs_charset = g_strdup(charset);
+
+	g_debug("path_set_fs_charset: fs charset is: %s", fs_charset);
+}
+
+const char *path_get_fs_charset(void)
+{
+	return fs_charset;
+}
+
+void path_global_init(void)
+{
+	const char *charset = NULL;
+
+	charset = config_get_string(CONF_FS_CHARSET, NULL);
+	if (charset == NULL) {
+#ifndef G_OS_WIN32
+		const gchar **encodings;
+		g_get_filename_charsets(&encodings);
+
+		if (encodings[0] != NULL && *encodings[0] != '\0')
+			charset = encodings[0];
+#else /* G_OS_WIN32 */
+		/* Glib claims that file system encoding is always utf-8
+		 * on native Win32 (i.e. not Cygwin).
+		 * However this is true only if <gstdio.h> helpers are used.
+		 * MPD uses regular <stdio.h> functions.
+		 * Those functions use encoding determined by GetACP(). */
+		static char win_charset[13];
+		sprintf(win_charset, "cp%u", GetACP());
+		charset = win_charset;
+#endif
+	}
+
+	if (charset) {
+		path_set_fs_charset(charset);
+	} else {
+		g_message("setting filesystem charset to ISO-8859-1");
+		path_set_fs_charset("ISO-8859-1");
+	}
+}
+
+void path_global_finish(void)
+{
+	g_free(fs_charset);
+}
diff --git a/src/fs/Path.hxx b/src/fs/Path.hxx
new file mode 100644
index 00000000..24f1d5e1
--- /dev/null
+++ b/src/fs/Path.hxx
@@ -0,0 +1,264 @@
+/*
+ * 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_FS_PATH_HXX
+#define MPD_FS_PATH_HXX
+
+#include "check.h"
+#include "gcc.h"
+
+#include <glib.h>
+
+#include <algorithm>
+
+#include <assert.h>
+#include <string.h>
+#include <limits.h>
+
+#if !defined(MPD_PATH_MAX)
+#  if defined(MAXPATHLEN)
+#    define MPD_PATH_MAX MAXPATHLEN
+#  elif defined(PATH_MAX)
+#    define MPD_PATH_MAX PATH_MAX
+#  else
+#    define MPD_PATH_MAX 256
+#  endif
+#endif
+
+void path_global_init();
+
+void path_global_finish();
+
+/**
+ * Converts a file name in the filesystem charset to UTF-8.  Returns
+ * NULL on failure.
+ */
+char *
+fs_charset_to_utf8(const char *path_fs);
+
+/**
+ * Converts a file name in UTF-8 to the filesystem charset.  Returns a
+ * duplicate of the UTF-8 string on failure.
+ */
+char *
+utf8_to_fs_charset(const char *path_utf8);
+
+const char *path_get_fs_charset();
+
+/**
+ * A path name in the native file system character set.
+ */
+class Path {
+public:
+	typedef char value_type;
+	typedef value_type *pointer;
+	typedef const value_type *const_pointer;
+
+private:
+	pointer value;
+
+	struct Donate {};
+
+	/**
+	 * Donate the allocated pointer to a new #Path object.
+	 */
+	constexpr Path(Donate, pointer _value):value(_value) {}
+
+	/**
+	 * Release memory allocated by the value, but do not clear the
+	 * value pointer.
+	 */
+	void Free() {
+		/* free() can be optimized by gcc, while g_free() can
+		   not: when the compiler knows that the value is
+		   nullptr, it will not emit a free() call in the
+		   inlined destructor; however on Windows, we need to
+		   call g_free(), because the value has been allocated
+		   by GLib, and on Windows, this matters */
+#ifdef WIN32
+		g_free(value);
+#else
+		free(value);
+#endif
+	}
+
+public:
+	/**
+	 * Copy a #Path object.
+	 */
+	Path(const Path &other)
+		:value(g_strdup(other.value)) {}
+
+	/**
+	 * Move a #Path object.
+	 */
+	Path(Path &&other):value(other.value) {
+		other.value = nullptr;
+	}
+
+	~Path() {
+		Free();
+	}
+
+	/**
+	 * Return a "nulled" instance.  Its IsNull() method will
+	 * return true.  Such an object must not be used.
+	 *
+	 * @see IsNull()
+	 */
+	gcc_const
+	static Path Null() {
+		return Path(Donate(), nullptr);
+	}
+
+	/**
+	 * Join two path components with the path separator.
+	 */
+	gcc_pure gcc_nonnull_all
+	static Path Build(const_pointer a, const_pointer b) {
+		return Path(Donate(), g_build_filename(a, b, nullptr));
+	}
+
+	gcc_pure gcc_nonnull_all
+	static Path Build(const_pointer a, const Path &b) {
+		return Build(a, b.c_str());
+	}
+
+	gcc_pure gcc_nonnull_all
+	static Path Build(const Path &a, const_pointer b) {
+		return Build(a.c_str(), b);
+	}
+
+	gcc_pure
+	static Path Build(const Path &a, const Path &b) {
+		return Build(a.c_str(), b.c_str());
+	}
+
+	/**
+	 * Convert a C string that is already in the filesystem
+	 * character set to a #Path instance.
+	 */
+	gcc_pure
+	static Path FromFS(const_pointer fs) {
+		return Path(Donate(), g_strdup(fs));
+	}
+
+	/**
+	 * Convert a UTF-8 C string to a #Path instance.
+	 *
+	 * TODO: return a "nulled" instance on error and add checks to
+	 * all callers
+	 */
+	gcc_pure
+	static Path FromUTF8(const char *utf8) {
+		return Path(Donate(), utf8_to_fs_charset(utf8));
+	}
+
+	/**
+	 * Copy a #Path object.
+	 */
+	Path &operator=(const Path &other) {
+		if (this != &other) {
+			Free();
+			value = g_strdup(other.value);
+		}
+
+		return *this;
+	}
+
+	/**
+	 * Move a #Path object.
+	 */
+	Path &operator=(Path &&other) {
+		std::swap(value, other.value);
+		return *this;
+	}
+
+	/**
+	 * Steal the allocated value.  This object has an undefined
+	 * value, and the caller is response for freeing this method's
+	 * return value.
+	 */
+	pointer Steal() {
+		pointer result = value;
+		value = nullptr;
+		return result;
+	}
+
+	/**
+	 * Check if this is a "nulled" instance.  A "nulled" instance
+	 * must not be used.
+	 */
+	bool IsNull() const {
+		return value == nullptr;
+	}
+
+	/**
+	 * Clear this object's value, make it "nulled".
+	 *
+	 * @see IsNull()
+	 */
+	void SetNull() {
+		Free();
+		value = nullptr;
+	}
+
+	gcc_pure
+	bool empty() const {
+		assert(value != nullptr);
+
+		return *value == 0;
+	}
+
+	/**
+	 * @return the length of this string in number of "value_type"
+	 * elements (which may not be the number of characters).
+	 */
+	gcc_pure
+	size_t length() const {
+		assert(value != nullptr);
+
+		return strlen(value);
+	}
+
+	/**
+	 * Returns the value as a const C string.  The returned
+	 * pointer is invalidated whenever the value of life of this
+	 * instance ends.
+	 */
+	gcc_pure
+	const_pointer c_str() const {
+		assert(value != nullptr);
+
+		return value;
+	}
+
+	/**
+	 * Convert the path to UTF-8.  The caller is responsible for
+	 * freeing the return value with g_free().  Returns nullptr on
+	 * error.
+	 */
+	char *ToUTF8() const {
+		return value != nullptr
+			? fs_charset_to_utf8(value)
+			: nullptr;
+	}
+};
+
+#endif