96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/*==============================================================================
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** Copyright (C) 2024-2027 WingSummer
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**
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** This program is free software: you can redistribute it and/or modify it under
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** the terms of the GNU Affero General Public License as published by the Free
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** Software Foundation, version 3.
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**
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** This program is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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** FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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** details.
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**
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** You should have received a copy of the GNU Affero General Public License
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** along with this program. If not, see <https://www.gnu.org/licenses/>.
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**
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** The original License is MIT from Dax89/QHexView. I have modified a lot so I
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** decide to change the Open Source License. You can use the original library
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** under MIT. Thanks for Dax89's efforts.
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** =============================================================================
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*/
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#include "qfileregionbuffer.h"
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#include <QFile>
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#include <QFileInfo>
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#ifdef Q_OS_LINUX
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#include <unistd.h>
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#endif
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QFileRegionBuffer::QFileRegionBuffer(QObject *parent) : QHexBuffer(parent) {}
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qsizetype QFileRegionBuffer::length() const { return buffer.length(); }
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void QFileRegionBuffer::insert(qsizetype offset, const QByteArray &data) {
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buffer.insert(offset, data);
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return;
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}
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void QFileRegionBuffer::remove(qsizetype offset, qsizetype length) {
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buffer.remove(offset, length);
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}
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QByteArray QFileRegionBuffer::read(qsizetype offset, qsizetype length) {
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return buffer.mid(offset, length);
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}
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bool QFileRegionBuffer::read(QIODevice *iodevice) {
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auto file = qobject_cast<QFile *>(iodevice);
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if (file && file->open(QFile::ReadOnly)) {
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#ifdef Q_OS_LINUX
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lseek(file->handle(), offset,
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SEEK_SET); // 有些特殊的文件 Qt 是不支持 seek 的，用原生函数
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#else
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file->seek(offset);
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#endif
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buffer = file->read(maxlength);
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file->close();
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return true;
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}
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return false;
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}
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#include <QDebug>
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void QFileRegionBuffer::write(QIODevice *iodevice) {
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auto file = qobject_cast<QFile *>(iodevice);
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#ifdef Q_OS_LINUX
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lseek(file->handle(), offset,
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SEEK_SET); // 有些特殊的文件 Qt 是不支持 seek 的，用原生函数
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#else
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file->seek(offset);
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#endif
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file->write(buffer);
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}
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qsizetype QFileRegionBuffer::indexOf(const QByteArray &ba, qsizetype from) {
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return buffer.indexOf(ba, int(from));
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}
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qsizetype QFileRegionBuffer::lastIndexOf(const QByteArray &ba, qsizetype from) {
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return buffer.lastIndexOf(ba, int(from));
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}
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void QFileRegionBuffer::setReadOffset(qsizetype offset) {
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this->offset = offset;
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}
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qsizetype QFileRegionBuffer::readOffset() { return offset; }
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qsizetype QFileRegionBuffer::readMaxBytes() { return maxlength; }
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void QFileRegionBuffer::setReadMaxBytes(qsizetype maxlength) {
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if (maxlength)
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this->maxlength = maxlength;
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}
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