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// Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "assimphelpers.h"
#include <QtCore/QFileDevice>
#include <QtCore/QFileInfo>
#include <QtCore/QUrl>
#include <QtCore/QDir>
#include <QtCore/QDebug>
#include <memory>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace AssimpHelper {
/*!
* \class Qt3DRender::AssimpHelper::AssimpIOStream
*
* \internal
*
* \brief Provides a custom file stream class to be used by AssimpIOSystem.
*
*/
/*!
* Builds a new AssimpIOStream instance.
*/
AssimpIOStream::AssimpIOStream(QIODevice *device) :
Assimp::IOStream(),
m_device(device)
{
Q_ASSERT(m_device != nullptr);
}
/*!
* Clears an AssimpIOStream instance before deletion.
*/
AssimpIOStream::~AssimpIOStream()
{
// Owns m_device
delete m_device;
}
/*!
* Reads at most \a pCount elements of \a pSize bytes of data into \a pvBuffer.
* Returns the number of bytes read or -1 if an error occurred.
*/
size_t AssimpIOStream::Read(void *pvBuffer, size_t pSize, size_t pCount)
{
qint64 readBytes = m_device->read((char *)pvBuffer, pSize * pCount);
if (readBytes < 0)
qWarning() << Q_FUNC_INFO << " Reading failed";
return readBytes;
}
/*!
* Writes \a pCount elements of \a pSize bytes from \a pvBuffer.
* Returns the number of bytes written or -1 if an error occurred.
*/
size_t AssimpIOStream::Write(const void *pvBuffer, size_t pSize, size_t pCount)
{
qint64 writtenBytes = m_device->write((char *)pvBuffer, pSize * pCount);
if (writtenBytes < 0)
qWarning() << Q_FUNC_INFO << " Writing failed";
return writtenBytes;
}
/*!
* Seeks the current file descriptor to a position defined by \a pOrigin and \a pOffset
*/
aiReturn AssimpIOStream::Seek(size_t pOffset, aiOrigin pOrigin)
{
qint64 seekPos = pOffset;
if (pOrigin == aiOrigin_CUR)
seekPos += m_device->pos();
else if (pOrigin == aiOrigin_END)
seekPos += m_device->size();
if (!m_device->seek(seekPos)) {
qWarning() << Q_FUNC_INFO << " Seeking failed";
return aiReturn_FAILURE;
}
return aiReturn_SUCCESS;
}
/*!
* Returns the current position of the read/write cursor.
*/
size_t AssimpIOStream::Tell() const
{
return m_device->pos();
}
/*!
* Returns the filesize;
*/
size_t AssimpIOStream::FileSize() const
{
return m_device->size();
}
/*!
* Flushes the current device.
*/
void AssimpIOStream::Flush()
{
// QIODevice has no flush method
if (QFileDevice *file = qobject_cast<QFileDevice *>(m_device))
file->flush();
}
/*!
* \class Qt3DRender::AssimpHelper::AssimpIOSystem
*
* \internal
*
* \brief Provides a custom file handler to the Assimp importer in order to handle
* various Qt specificities (QResources ...)
*
*/
static QIODevice::OpenMode openModeFromText(const char *name) noexcept
{
static const struct OpenModeMapping {
char name[2];
ushort mode;
} openModeMapping[] = {
{ { 'r', 0 }, QIODevice::ReadOnly },
{ { 'r', '+' }, QIODevice::ReadWrite },
{ { 'w', 0 }, QIODevice::WriteOnly | QIODevice::Truncate },
{ { 'w', '+' }, QIODevice::ReadWrite | QIODevice::Truncate },
{ { 'a', 0 }, QIODevice::WriteOnly | QIODevice::Append },
{ { 'a', '+' }, QIODevice::ReadWrite | QIODevice::Append },
{ { 'w', 'b' }, QIODevice::WriteOnly },
{ { 'w', 't' }, QIODevice::WriteOnly | QIODevice::Text },
{ { 'r', 'b' }, QIODevice::ReadOnly },
{ { 'r', 't' }, QIODevice::ReadOnly | QIODevice::Text },
};
for (auto e : openModeMapping) {
if (qstrncmp(e.name, name, sizeof(OpenModeMapping::name)) == 0)
return static_cast<QIODevice::OpenMode>(e.mode);
}
return QIODevice::NotOpen;
}
/*!
* Returns true if the file located at pFile exists, false otherwise.
*/
bool AssimpIOSystem::Exists(const char *pFile) const
{
return QFileInfo::exists(QString::fromUtf8(pFile));
}
/*!
* Returns the default system separator.
*/
char AssimpIOSystem::getOsSeparator() const
{
return QDir::separator().toLatin1();
}
/*!
* Opens the file located at \a pFile with the opening mode
* specified by \a pMode.
*/
Assimp::IOStream *AssimpIOSystem::Open(const char *pFile, const char *pMode)
{
const QString fileName(QString::fromUtf8(pFile));
const QLatin1String cleanedMode = QLatin1String{pMode}.trimmed();
if (const QIODevice::OpenMode openMode = openModeFromText(cleanedMode.data())) {
auto file = std::make_unique<QFile>(fileName);
if (file->open(openMode))
return new AssimpIOStream(file.release());
}
return nullptr;
}
/*!
* Closes the Assimp::IOStream \a pFile.
*/
void AssimpIOSystem::Close(Assimp::IOStream *pFile)
{
// Assimp::IOStream has a virtual destructor which closes the stream
delete pFile;
}
} // namespace AssimpHelper
} // namespace Qt3DRender
QT_END_NAMESPACE
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