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/*
* Copyright (C) 2003-2014 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 "Charset.hxx"
#include "Domain.hxx"
#include "Limits.hxx"
#include "system/FatalError.hxx"
#include "Log.hxx"
#include "Traits.hxx"
#include <glib.h>
#include <algorithm>
#include <assert.h>
#include <string.h>
/**
* 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.
*/
static constexpr size_t MPD_PATH_MAX_UTF8 = (MPD_PATH_MAX - 1) * 4 + 1;
static std::string fs_charset;
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", nullptr, nullptr, nullptr);
if (test == nullptr)
return false;
g_free(test);
return true;
}
void
SetFSCharset(const char *charset)
{
assert(charset != nullptr);
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 char *
GetFSCharset()
{
return fs_charset.empty() ? "utf-8" : fs_charset.c_str();
}
static inline void FixSeparators(std::string &s)
{
#ifdef WIN32
// For whatever reason GCC can't convert constexpr to value reference.
// This leads to link errors when passing separators directly.
auto from = PathTraitsFS::SEPARATOR;
auto to = PathTraitsUTF8::SEPARATOR;
std::replace(s.begin(), s.end(), from, to);
#else
(void)s;
#endif
}
std::string
PathToUTF8(const char *path_fs)
{
assert(path_fs != nullptr);
if (fs_charset.empty()) {
auto result = std::string(path_fs);
FixSeparators(result);
return result;
}
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();
auto result_path = std::string(path_utf8, sizeof(path_utf8) - out_left);
FixSeparators(result_path);
return result_path;
}
char *
PathFromUTF8(const char *path_utf8)
{
assert(path_utf8 != nullptr);
if (fs_charset.empty())
return g_strdup(path_utf8);
return g_convert(path_utf8, -1,
fs_charset.c_str(), "utf-8",
nullptr, nullptr, nullptr);
}
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