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/* -*- Mode: c++ -*- */
/***************************************************************************
* translation.cc
*
* Sun Sep 8 14:13:22 CEST 2019
* Copyright 2019 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "translation.h"
#ifdef WITH_NLS
#include <locale.h>
#include <vector>
#include <mutex>
#include <string>
#include <atomic>
#include <algorithm>
#include <utility>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
namespace
{
using Text = std::pair<std::uint64_t, std::string>;
using Texts = std::vector<Text>;
struct
{
std::mutex mutex;
int refcnt{0};
Texts texts;
} singleton;
bool comparator(const Text& a, const Text& b)
{
return a.first < b.first;
}
}
Translation::Translation()
{
std::lock_guard<std::mutex>(singleton.mutex);
++singleton.refcnt;
}
Translation::~Translation()
{
std::lock_guard<std::mutex>(singleton.mutex);
--singleton.refcnt;
if(singleton.refcnt == 0)
{
singleton.texts.clear();
}
}
bool Translation::load(const char* catalog, std::size_t size)
{
Texts texts;
// https://www.gnu.org/software/gettext/manual/html_node/MO-Files.html
// byte
// +------------------------------------------+
// 0 | magic number = 0x950412de |
// | |
// 4 | file format revision = 0 |
// | |
// 8 | number of strings | == N
// | |
// 12 | offset of table with original strings | == O
// | |
// 16 | offset of table with translation strings | == T
// | |
// 20 | size of hashing table | == S
// | |
// 24 | offset of hashing table | == H
// | |
// . .
// . (possibly more entries later) .
// . .
// | |
// O | length & offset 0th string ----------------.
// O + 8 | length & offset 1st string ------------------.
// ... ... | |
// O + ((N-1)*8)| length & offset (N-1)th string | | |
// | | | |
// T | length & offset 0th translation ---------------.
// T + 8 | length & offset 1st translation -----------------.
// ... ... | | | |
// T + ((N-1)*8)| length & offset (N-1)th translation | | | | |
// | | | | | |
// H | start hash table | | | | |
// ... ... | | | |
// H + S * 4 | end hash table | | | | |
// | | | | | |
// | NUL terminated 0th string <----------------' | | |
// | | | | |
// | NUL terminated 1st string <------------------' | |
// | | | |
// ... ... | |
// | | | |
// | NUL terminated 0th translation <---------------' |
// | | |
// | NUL terminated 1st translation <-----------------'
// | |
// ... ...
// | |
// +------------------------------------------+
constexpr std::uint32_t magic_number_le = 0x950412de;
constexpr std::uint32_t magic_number_be = 0xde120495;
const char* ptr = catalog;
// Verify magic number
std::uint32_t magic_number = *reinterpret_cast<const std::uint32_t*>(ptr);
if(magic_number != magic_number_le && magic_number != magic_number_be)
{
// Error - bad magic number
return false;
}
ptr += sizeof(magic_number);
// Verify file format revision
std::uint32_t file_format_revision =
*reinterpret_cast<const std::uint32_t*>(ptr);
if(file_format_revision != 0)
{
// Error - bad file format revision
return false;
}
ptr += sizeof(file_format_revision);
// Read number of string in the catalog
std::uint32_t number_of_strings =
*reinterpret_cast<const std::uint32_t*>(ptr);
ptr += sizeof(number_of_strings);
// Read orig_table_offset
std::uint32_t orig_table_offset =
*reinterpret_cast<const std::uint32_t*>(ptr);
ptr += sizeof(orig_table_offset);
// Read transl_table_offset
std::uint32_t transl_table_offset =
*reinterpret_cast<const std::uint32_t*>(ptr);
ptr += sizeof(transl_table_offset);
// Read hash_table_size
std::uint32_t hash_table_size =
*reinterpret_cast<const std::uint32_t*>(ptr);
ptr += sizeof(hash_table_size);
// Read hash_table_offset
std::uint32_t hash_table_offset =
*reinterpret_cast<const std::uint32_t*>(ptr);
ptr += sizeof(hash_table_offset);
// Read original/translated string tables:
const char* orig_ptr = catalog + orig_table_offset;
const char* transl_ptr = catalog + transl_table_offset;
for(std::uint32_t string_index = 0;
string_index < number_of_strings; ++string_index)
{
// Read string_length
std::uint32_t orig_string_length =
*reinterpret_cast<const std::uint32_t*>(orig_ptr);
orig_ptr += sizeof(orig_string_length);
// Read string_offset
std::uint32_t orig_string_offset =
*reinterpret_cast<const std::uint32_t*>(orig_ptr);
orig_ptr += sizeof(orig_string_offset);
std::string orig;
orig.append(catalog + orig_string_offset, orig_string_length);
// Read string_length
std::uint32_t transl_string_length =
*reinterpret_cast<const std::uint32_t*>(transl_ptr);
transl_ptr += sizeof(transl_string_length);
// Read string_offset
std::uint32_t transl_string_offset =
*reinterpret_cast<const std::uint32_t*>(transl_ptr);
transl_ptr += sizeof(transl_string_offset);
std::string transl;
transl.append(catalog + transl_string_offset, transl_string_length);
texts.push_back(make_pair(const_hash(orig.data()), transl));
}
std::sort(texts.begin(), texts.end(), comparator);
{
std::lock_guard<std::mutex>(singleton.mutex);
std::swap(singleton.texts, texts);
}
return true;
}
const char* Translation::gettext(std::uint64_t msgid, const char* original)
{
std::lock_guard<std::mutex>(singleton.mutex);
if(singleton.refcnt == 0)
{
return original;
}
auto it = std::lower_bound(singleton.texts.begin(),
singleton.texts.end(),
make_pair(msgid, std::string()), comparator);
if(it == singleton.texts.end() ||
it->first != msgid)
{
return original;
}
return it->second.data();
}
std::string Translation::getISO639LanguageName()
{
std::string lang;
#ifdef _WIN32
LCID lcid = GetUserDefaultLCID();
char name[LOCALE_NAME_MAX_LENGTH];
GetLocaleInfo(lcid, LOCALE_SISO639LANGNAME, name, LOCALE_NAME_MAX_LENGTH);
lang = name;
#else
try
{
auto langstr = setlocale(LC_ALL, "");
if(langstr != nullptr)
{
lang = langstr;
}
}
catch(...)
{
// Bad locale: don't load anything - use default
printf("Bad locale: don't load anything - use default\n");
return "";
}
if(lang == "C")
{
printf("Don't load anything - use default\n");
return ""; // Don't load anything - use default
}
auto _ = lang.find('_');
lang = lang.substr(0, _);
#endif
return lang;
}
#endif // WITH_NLS
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