keepassxc

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/*
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 *  Copyright (C) 2018 KeePassXC Team <team@keepassxc.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 or (at your option)
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 *  version 3 of the License.
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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
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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#include "TextStream.h"
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#include <QProcessEnvironment>
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#include <QTextCodec>
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#ifdef Q_OS_WIN
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#include <windows.h>
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#endif
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TextStream::TextStream()
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{
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    detectCodec();
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}
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TextStream::TextStream(QIODevice* device)
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    : QTextStream(device)
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{
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    detectCodec();
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}
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TextStream::TextStream(FILE* fileHandle, QIODevice::OpenMode openMode)
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    : QTextStream(fileHandle, openMode)
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{
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    detectCodec();
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}
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TextStream::TextStream(QString* string, QIODevice::OpenMode openMode)
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    : QTextStream(string, openMode)
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{
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    detectCodec();
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}
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TextStream::TextStream(QByteArray* array, QIODevice::OpenMode openMode)
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    : QTextStream(array, openMode)
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{
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    detectCodec();
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}
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TextStream::TextStream(const QByteArray& array, QIODevice::OpenMode openMode)
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    : QTextStream(array, openMode)
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{
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    detectCodec();
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}
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void TextStream::write(const char* str)
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{
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    // Workaround for an issue with QTextStream. Its operator<<(const char *string) will encode the
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    // string with a non-UTF-8 encoding. We work around this by wrapping the input string into
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    // a QString, thus enforcing UTF-8. More info:
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    // https://code.qt.io/cgit/qt/qtbase.git/commit?id=cec8cdba4d1b856e17c8743ba8803349d42dc701
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    *this << QString(str);
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}
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void TextStream::detectCodec()
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{
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    QString codecName = "UTF-8";
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    auto env = QProcessEnvironment::systemEnvironment();
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#ifdef Q_OS_WIN
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    bool success = false;
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#ifdef CP_UTF8
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    success = SetConsoleOutputCP(CP_UTF8);
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#endif
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    if (!success && !env.contains("SHELL")) {
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        // Fall back to cp850 if this is Windows without CP_UTF8 and we
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        // are running in a native shell (i.e., no Msys or Cygwin).
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        codecName = "Windows-850";
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    }
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#else
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    if (env.contains("LANG") && !env.value("LANG").isEmpty() && env.value("LANG") != "C") {
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        // Only override codec if LANG is set, otherwise Qt will assume
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        // US-ASCII, which is almost always wrong and results in
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        // Unicode passwords being displayed as question marks.
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        codecName = QTextCodec::codecForLocale()->name();
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    }
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#endif
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    codecName = env.value("ENCODING_OVERRIDE", codecName);
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    auto* codec = QTextCodec::codecForName(codecName.toLatin1());
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    if (codec) {
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        setCodec(codec);
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    }
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}
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