1 files changed, 267 insertions, 0 deletions
diff --git a/src/fs/Path.hxx b/src/fs/Path.hxx
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--- /dev/null
+++ b/src/fs/Path.hxx
@@ -0,0 +1,267 @@
+/*
+ * 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 <string>
+
+#include <assert.h>
+#include <string.h>
+#include <limits.h>
+
+#if !defined(MPD_PATH_MAX)
+#  if defined(WIN32)
+#    define MPD_PATH_MAX 260
+#  elif 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
+
+/**
+ * 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.
+	 * Returns return a "nulled" instance on error.
+	 */
+	gcc_pure
+	static Path FromUTF8(const char *path_utf8);
+
+	/**
+	 * Convert the path to UTF-8.
+	 * Returns empty string on error or if #path_fs is null pointer.
+	 */
+	gcc_pure
+	static std::string ToUTF8(const_pointer path_fs);
+
+	/**
+	 * Performs global one-time initialization of this class.
+	 */
+	static void GlobalInit();
+
+	/**
+	 * Gets file system character set name.
+	 */
+	static const std::string &GetFSCharset();
+
+	/**
+	 * 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.
+	 * Returns empty string on error or if this instance is "nulled"
+	 * (#IsNull returns true).
+	 */
+	std::string ToUTF8() const {
+		return ToUTF8(value);
+	}
+
+	/**
+	 * Gets directory name of this path.
+	 * Returns a "nulled" instance on error.
+	 */
+	Path GetDirectoryName() const {
+		assert(value != nullptr);
+		return Path(Donate(), g_path_get_dirname(value));
+	}
+};
+
+#endif