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/*
This file is part of KDE
SPDX-FileCopyrightText: 1999-2000 Waldo Bastian <bastian@kde.org>
SPDX-FileCopyrightText: 2008 David Faure <faure@kde.org>
SPDX-License-Identifier: MIT
*/
#include "filter.h"
#include <QCoreApplication>
#include <QDebug>
#include <QFile>
#include <QFileInfo>
#include <QMimeDatabase>
#include <QMimeType>
#include <QUrl>
#include <KCompressionDevice>
#include <KFilterBase>
#include "loggingcategory.h"
// Pseudo plugin class to embed meta data
class KIOPluginForMetaData : public QObject
{
Q_OBJECT
Q_PLUGIN_METADATA(IID "org.kde.kio.worker.filter" FILE "filter.json")
};
extern "C" {
Q_DECL_EXPORT int kdemain(int argc, char **argv);
}
int kdemain(int argc, char **argv)
{
QCoreApplication app(argc, argv);
app.setApplicationName("kio_filter");
qDebug(KIO_FILTER_DEBUG) << "Starting";
if (argc != 4) {
fprintf(stderr, "Usage: kio_filter protocol domain-socket1 domain-socket2\n");
exit(-1);
}
FilterProtocol worker(argv[1], argv[2], argv[3]);
worker.dispatchLoop();
qDebug(KIO_FILTER_DEBUG) << "Done";
return 0;
}
FilterProtocol::FilterProtocol(const QByteArray &protocol, const QByteArray &pool, const QByteArray &app)
: KIO::WorkerBase(protocol, pool, app)
, m_protocol(QString::fromLatin1(protocol))
{
const QString mimetype = (protocol == "zstd") ? QStringLiteral("application/zstd") : QLatin1String("application/x-") + QLatin1String(protocol.constData());
filter = KCompressionDevice::filterForCompressionType(KCompressionDevice::compressionTypeForMimeType(mimetype));
Q_ASSERT(filter);
}
KIO::WorkerResult FilterProtocol::get(const QUrl &url)
{
// In the old solution, subURL would be set by setSubURL.
// KDE4: now I simply assume bzip2:/localpath/file.bz2 and set subURL to the local path.
QUrl subURL = url;
subURL.setScheme("file");
if (subURL.isEmpty()) {
return KIO::WorkerResult::fail(KIO::ERR_NO_SOURCE_PROTOCOL, m_protocol);
}
QFile localFile(url.path());
if (!localFile.open(QIODevice::ReadOnly)) {
return KIO::WorkerResult::fail(KIO::ERR_CANNOT_READ, m_protocol);
}
if (!filter) {
// TODO better error message
return KIO::WorkerResult::fail(KIO::ERR_INTERNAL, m_protocol);
}
filter->init(QIODevice::ReadOnly);
bool bNeedHeader = true;
bool bNeedMimetype = true;
bool bError = true;
int result;
QByteArray inputBuffer;
inputBuffer.resize(8 * 1024);
QByteArray outputBuffer;
outputBuffer.resize(8 * 1024); // Start with a modest buffer
filter->setOutBuffer(outputBuffer.data(), outputBuffer.size());
while (true) {
if (filter->inBufferEmpty()) {
result = localFile.read(inputBuffer.data(), inputBuffer.size());
qDebug(KIO_FILTER_DEBUG) << "requestData: got " << result;
if (result <= 0) {
bError = true;
break; // Unexpected EOF.
}
filter->setInBuffer(inputBuffer.data(), inputBuffer.size());
}
if (bNeedHeader) {
bError = !filter->readHeader();
if (bError)
break;
bNeedHeader = false;
}
result = filter->uncompress();
if ((filter->outBufferAvailable() == 0) || (result == KFilterBase::End)) {
qDebug(KIO_FILTER_DEBUG) << "avail_out = " << filter->outBufferAvailable();
if (filter->outBufferAvailable() != 0) {
// Discard unused space :-)
outputBuffer.resize(outputBuffer.size() - filter->outBufferAvailable());
}
if (bNeedMimetype) {
// Can we use the "base" filename? E.g. foo.txt.bz2
const QString extension = QFileInfo(subURL.path()).suffix();
QMimeDatabase db;
QMimeType mime;
if (extension == "gz" || extension == "bz" || extension == "bz2" || extension == "zst") {
QString baseName = subURL.path();
baseName.truncate(baseName.length() - extension.length() - 1 /*the dot*/);
qDebug(KIO_FILTER_DEBUG) << "baseName=" << baseName;
mime = db.mimeTypeForFileNameAndData(baseName, outputBuffer);
} else {
mime = db.mimeTypeForData(outputBuffer);
}
qDebug(KIO_FILTER_DEBUG) << "Emitting mimetype " << mime.name();
mimeType(mime.name());
bNeedMimetype = false;
}
data(outputBuffer); // Send data
filter->setOutBuffer(outputBuffer.data(), outputBuffer.size());
if (result == KFilterBase::End)
break; // Finished.
}
if (result != KFilterBase::Ok) {
bError = true;
break; // Error
}
}
if (!bError) {
result = localFile.read(inputBuffer.data(), inputBuffer.size());
qDebug(KIO_FILTER_DEBUG) << "requestData: got" << result << "(expecting 0)";
data(QByteArray()); // Send EOF
}
filter->terminate();
if (bError) {
return KIO::WorkerResult::fail(KIO::ERR_CANNOT_READ, subURL.url());
}
return KIO::WorkerResult::pass();
}
#include "filter.moc"
#include "moc_filter.cpp"
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