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/*
* 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 "ConfigGlobal.hxx"
#include "system/FatalError.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include "Compiler.h"
#include <glib.h>
#include <assert.h>
#include <string.h>
#ifdef WIN32
#include <windows.h> // for GetACP()
#include <stdio.h> // for sprintf()
#endif
/**
* Maximal number of bytes required to represent path name in UTF-8
* (including nul-terminator).
* This value is a rought estimate of upper bound.
* It's based on path name limit in bytes (MPD_PATH_MAX)
* and assumption that some weird encoding could represent some UTF-8 4 byte
* sequences with single byte.
*/
#define MPD_PATH_MAX_UTF8 ((MPD_PATH_MAX - 1) * 4 + 1)
const Domain path_domain("path");
std::string fs_charset;
inline Path::Path(Donate, pointer _value)
:value(_value) {
g_free(_value);
}
/* no inlining, please */
Path::~Path() {}
Path
Path::Build(const_pointer a, const_pointer b)
{
return Path(Donate(), g_build_filename(a, b, nullptr));
}
std::string Path::ToUTF8(const_pointer path_fs)
{
if (path_fs == nullptr)
return std::string();
GIConv conv = g_iconv_open("utf-8", fs_charset.c_str());
if (conv == reinterpret_cast<GIConv>(-1))
return std::string();
// g_iconv() does not need nul-terminator,
// std::string could be created without it too.
char path_utf8[MPD_PATH_MAX_UTF8 - 1];
char *in = const_cast<char *>(path_fs);
char *out = path_utf8;
size_t in_left = strlen(path_fs);
size_t out_left = sizeof(path_utf8);
size_t ret = g_iconv(conv, &in, &in_left, &out, &out_left);
g_iconv_close(conv);
if (ret == static_cast<size_t>(-1) || in_left > 0)
return std::string();
return std::string(path_utf8, sizeof(path_utf8) - out_left);
}
Path Path::FromUTF8(const char *path_utf8)
{
gchar *p;
p = g_convert(path_utf8, -1,
fs_charset.c_str(), "utf-8",
NULL, NULL, NULL);
return Path(Donate(), p);
}
Path
Path::FromUTF8(const char *path_utf8, Error &error)
{
Path path = FromUTF8(path_utf8);
if (path.IsNull())
error.Format(path_domain,
"Failed to convert to file system charset: %s",
path_utf8);
return path;
}
Path
Path::GetDirectoryName() const
{
return Path(Donate(), g_path_get_dirname(value.c_str()));
}
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
SetFSCharset(const char *charset)
{
assert(charset != NULL);
if (!IsSupportedCharset(charset))
FormatFatalError("invalid filesystem charset: %s", charset);
fs_charset = charset;
FormatDebug(path_domain,
"SetFSCharset: fs charset is: %s", fs_charset.c_str());
}
const std::string &Path::GetFSCharset()
{
return fs_charset;
}
void Path::GlobalInit()
{
const char *charset = NULL;
charset = config_get_string(CONF_FS_CHARSET, NULL);
if (charset == NULL) {
#ifndef WIN32
const gchar **encodings;
g_get_filename_charsets(&encodings);
if (encodings[0] != NULL && *encodings[0] != '\0')
charset = encodings[0];
#else
/* 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) {
SetFSCharset(charset);
} else {
LogDebug(path_domain,
"setting filesystem charset to ISO-8859-1");
SetFSCharset("ISO-8859-1");
}
}
const char *
Path::RelativeFS(const char *other_fs) const
{
const size_t l = length();
if (memcmp(data(), other_fs, l) != 0)
return nullptr;
other_fs += l;
if (*other_fs != 0) {
if (!IsSeparatorFS(*other_fs))
/* mismatch */
return nullptr;
/* skip remaining path separators */
do {
++other_fs;
} while (IsSeparatorFS(*other_fs));
}
return other_fs;
}
void
Path::ChopSeparators()
{
size_t l = length();
const char *p = data();
while (l >= 2 && IsSeparatorFS(p[l - 1])) {
--l;
#if GCC_CHECK_VERSION(4,7) && !defined(__clang__)
value.pop_back();
#else
value.erase(value.end() - 1, value.end());
#endif
}
}
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