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/**
* Copyright (C) 2021 Saturneric <[email protected]>
*
* This file is part of GpgFrontend.
*
* GpgFrontend 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 3 of the License, or
* (at your option) any later version.
*
* GpgFrontend 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 GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
*
* The initial version of the source code is inherited from
* the gpg4usb project, which is under GPL-3.0-or-later.
*
* All the source code of GpgFrontend was modified and released by
* Saturneric <[email protected]> starting on May 12, 2021.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#include "core/function/CharsetOperator.h"
#include <spdlog/spdlog.h>
#include <unicode/ucnv.h>
#include <unicode/ucsdet.h>
#include <unicode/ustring.h>
#include <unicode/utypes.h>
#include <cstddef>
#include <memory>
#include <string>
GpgFrontend::CharsetOperator::CharsetInfo GpgFrontend::CharsetOperator::Detect(
const std::string &buffer) {
const UCharsetMatch *ucm;
UErrorCode status = U_ZERO_ERROR;
UCharsetDetector *csd = ucsdet_open(&status);
status = U_ZERO_ERROR;
if (U_FAILURE(status)) {
SPDLOG_ERROR("failed to open charset detector: {}", u_errorName(status));
return {"unknown", "unknown", 0};
}
SPDLOG_DEBUG("detecting charset buffer: {} bytes", buffer.size());
status = U_ZERO_ERROR;
ucsdet_setText(csd, buffer.data(), buffer.size(), &status);
if (U_FAILURE(status)) {
SPDLOG_ERROR("failed to set text to charset detector: {}",
u_errorName(status));
return {"unknown", "unknown", 0};
}
status = U_ZERO_ERROR;
ucm = ucsdet_detect(csd, &status);
if (U_FAILURE(status)) return {"unknown", "unknown", 0};
status = U_ZERO_ERROR;
const char *name = ucsdet_getName(ucm, &status);
if (U_FAILURE(status)) return {"unknown", "unknown", 0};
status = U_ZERO_ERROR;
int confidence = ucsdet_getConfidence(ucm, &status);
if (U_FAILURE(status)) return {name, "unknown", 0};
status = U_ZERO_ERROR;
const char *language = ucsdet_getLanguage(ucm, &status);
if (U_FAILURE(status)) return {name, "unknown", confidence};
SPDLOG_DEBUG("Detected charset: {} {} {}", name, language, confidence);
return {name, language, confidence};
}
bool GpgFrontend::CharsetOperator::Convert2Utf8(const std::string &buffer,
std::string &out_buffer,
std::string from_charset_name) {
UErrorCode status = U_ZERO_ERROR;
const auto from_encode = std::string("utf-8");
const auto to_encode = from_charset_name;
SPDLOG_DEBUG("Converting buffer: {}", buffer.size());
// test if the charset is supported
UConverter *conv = ucnv_open(from_encode.c_str(), &status);
ucnv_close(conv);
if (U_FAILURE(status)) {
SPDLOG_ERROR("failed to open converter: {}, from encode: {}",
u_errorName(status), from_encode);
return false;
}
// test if the charset is supported
conv = ucnv_open(to_encode.c_str(), &status);
ucnv_close(conv);
if (U_FAILURE(status)) {
SPDLOG_ERROR("failed to open converter: {}, to encode: {}",
u_errorName(status), to_encode);
return false;
}
status = U_ZERO_ERROR;
int32_t target_limit = 0, target_capacity = 0;
target_capacity =
ucnv_convert(from_encode.c_str(), to_encode.c_str(), nullptr,
target_limit, buffer.data(), buffer.size(), &status);
if (status == U_BUFFER_OVERFLOW_ERROR) {
status = U_ZERO_ERROR;
out_buffer.clear();
out_buffer.resize(target_capacity);
ucnv_convert(from_encode.c_str(), to_encode.c_str(), out_buffer.data(),
out_buffer.size(), buffer.data(), buffer.size(), &status);
}
if (U_FAILURE(status)) {
SPDLOG_ERROR("failed to convert to utf-8: {}", u_errorName(status));
return false;
}
SPDLOG_DEBUG("converted buffer: {} bytes", out_buffer.size());
return true;
}
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