157 lines
3.7 KiB
C++
157 lines
3.7 KiB
C++
/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "Charset.hxx"
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#include "Domain.hxx"
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#include "Limits.hxx"
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#include "system/FatalError.hxx"
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#include "Log.hxx"
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#include "Traits.hxx"
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#ifdef HAVE_GLIB
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#include <glib.h>
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#endif
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#include <algorithm>
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#include <assert.h>
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#include <string.h>
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/**
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* Maximal number of bytes required to represent path name in UTF-8
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* (including nul-terminator).
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* This value is a rought estimate of upper bound.
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* It's based on path name limit in bytes (MPD_PATH_MAX)
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* and assumption that some weird encoding could represent some UTF-8 4 byte
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* sequences with single byte.
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*/
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static constexpr size_t MPD_PATH_MAX_UTF8 = (MPD_PATH_MAX - 1) * 4 + 1;
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#ifdef HAVE_GLIB
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static std::string fs_charset;
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gcc_pure
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static bool
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IsSupportedCharset(const char *charset)
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{
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/* convert a space to check if the charset is valid */
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char *test = g_convert(" ", 1, charset, "UTF-8", nullptr, nullptr, nullptr);
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if (test == nullptr)
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return false;
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g_free(test);
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return true;
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}
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void
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SetFSCharset(const char *charset)
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{
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assert(charset != nullptr);
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if (!IsSupportedCharset(charset))
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FormatFatalError("invalid filesystem charset: %s", charset);
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fs_charset = charset;
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FormatDebug(path_domain,
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"SetFSCharset: fs charset is: %s", fs_charset.c_str());
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}
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#endif
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const char *
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GetFSCharset()
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{
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#ifdef HAVE_GLIB
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return fs_charset.empty() ? "UTF-8" : fs_charset.c_str();
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#else
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return "UTF-8";
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#endif
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}
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static inline void FixSeparators(std::string &s)
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{
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#ifdef WIN32
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// For whatever reason GCC can't convert constexpr to value reference.
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// This leads to link errors when passing separators directly.
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auto from = PathTraitsFS::SEPARATOR;
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auto to = PathTraitsUTF8::SEPARATOR;
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std::replace(s.begin(), s.end(), from, to);
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#else
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(void)s;
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#endif
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}
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std::string
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PathToUTF8(const char *path_fs)
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{
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assert(path_fs != nullptr);
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#ifdef HAVE_GLIB
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if (fs_charset.empty()) {
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#endif
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auto result = std::string(path_fs);
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FixSeparators(result);
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return result;
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#ifdef HAVE_GLIB
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}
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GIConv conv = g_iconv_open("utf-8", fs_charset.c_str());
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if (conv == reinterpret_cast<GIConv>(-1))
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return std::string();
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// g_iconv() does not need nul-terminator,
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// std::string could be created without it too.
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char path_utf8[MPD_PATH_MAX_UTF8 - 1];
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char *in = const_cast<char *>(path_fs);
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char *out = path_utf8;
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size_t in_left = strlen(path_fs);
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size_t out_left = sizeof(path_utf8);
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size_t ret = g_iconv(conv, &in, &in_left, &out, &out_left);
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g_iconv_close(conv);
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if (ret == static_cast<size_t>(-1) || in_left > 0)
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return std::string();
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auto result_path = std::string(path_utf8, sizeof(path_utf8) - out_left);
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FixSeparators(result_path);
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return result_path;
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#endif
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}
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#ifdef HAVE_GLIB
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char *
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PathFromUTF8(const char *path_utf8)
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{
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assert(path_utf8 != nullptr);
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if (fs_charset.empty())
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return g_strdup(path_utf8);
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return g_convert(path_utf8, -1,
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fs_charset.c_str(), "utf-8",
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nullptr, nullptr, nullptr);
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}
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#endif
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