//
// Reads data from the input file
//
static
void pngReadFunc(png_struct * pngPtr, png_byte * data, png_size_t bytes)
{
MemoryFile * file = (MemoryFile *)pngPtr->io_ptr;
Q_ASSERT(file);
int64 result = file->read((char *)data, bytes);
if (unlikely(result != (int64)bytes))
png_error(pngPtr, "I/O error");
}
//
// tries to open a file from the given framenumber and reads the content into the vector of particles
//
void loadParticles( std::string fileName, std::vector<Particle> &particles )
{
// if the file is a zip file, then we assume that the zip contains the pcl file among other things
if( util::getExtension( fileName ) == ".zip" )
{
// unzip the pcl file into the memory
std::string title = dk::util::PathInfo::getTitle( fileName );
// open the zipfile
HZIP zip = OpenZip( util::toWString( fileName ).c_str(), 0 );
// set base directory for unzipping operations
SetUnzipBaseDir( zip, _T("\\") );
// zip entry for the pcl file
ZIPENTRY ze;
int entryIndex = -1;
// look for the pcl file
FindZipItem( zip, util::toWString( std::string( title ) + ".pcl" ).c_str(), false, &entryIndex, &ze );
if( entryIndex == -1 )
{
printf( "error : zip file doesnt contain %s\n", util::setExtension( fileName, ".pcl" ).c_str() );
// stop everything
return;
}
// prepare memory
MemoryFile file;
file.resize( ze.unc_size );
// we have found the particles -> unpack them into memory
UnzipItem( zip, entryIndex, file.getMemory(), file.size() );
CloseZip( zip );
// now read the particles
int particleCount = 0;
file.read((char *) &particleCount, sizeof(int) );
printf( "number of particles: %i\n", particleCount );
// prepare vector
particles.resize( particleCount );
// now read in (kinda rough)
for( int i=0; i<particleCount; ++i )
{
float pos[3];
file.read((char *) pos, sizeof(float) * 3 );
particles[i].position.x = pos[0];
particles[i].position.y = pos[1];
particles[i].position.z = pos[2];
}
}else
{
// open file from disk
std::ifstream in( fileName.c_str(), std::ios::in | std::ios::binary );
if( !in )
return;
int particleCount = 0;
in.read((char *) &particleCount, sizeof(int) );
printf( "number of particles: %i\n", particleCount );
// prepare vector
particles.resize( particleCount );
// now read in (kinda rough)
for( int i=0; i<particleCount; ++i )
{
float pos[3];
in.read((char *) pos, sizeof(float) * 3 );
particles[i].position.x = pos[0];
particles[i].position.y = pos[1];
particles[i].position.z = pos[2];
}
in.close();
}
}
