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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "gdcmStreamImageReader.h"
#include "gdcmStreamImageWriter.h"
#include "gdcmFileMetaInformation.h"
#include "gdcmSystem.h"
#include "gdcmFilename.h"
#include "gdcmByteSwap.h"
#include "gdcmTrace.h"
#include "gdcmTesting.h"
#include "gdcmImageHelper.h"
#include "gdcmImageReader.h"
#include "gdcmImage.h"
int TestStreamImageWrite(const char *subdir, const char* filename, bool verbose = false, bool lossydump = false)
{
(void)lossydump;
if( verbose )
std::cerr << "Reading and writing: " << filename << std::endl;
gdcm::ImageReader theImageReaderOriginal;
gdcm::ImageReader theImageReader;
gdcm::StreamImageWriter theStreamWriter;
theImageReaderOriginal.SetFileName( filename );
// Create directory first:
std::string tmpdir = gdcm::Testing::GetTempDirectory( subdir );
if( !gdcm::System::FileIsDirectory( tmpdir.c_str() ) )
{
gdcm::System::MakeDirectory( tmpdir.c_str() );
//return 1;
}
std::string outfilename = gdcm::Testing::GetTempFilename( filename, subdir );
if ( theImageReaderOriginal.Read() )
{
//int res = 0;
//to test the writer out, we have to read an image and then
//write it out one line at a time.
//a _real_ test would include both the streamimagereader and writer.
//so, this test is:
//1) read in the image via the stream reader
//2) write it out line by line
//3) read it in by a reader
//4) compare the image from step 1 with step 3
//5) go to step2, replace step 3 with a regular image reader.
//for now, we'll do 1-4
//pull image information prior to messing with the file
gdcm::Image theOriginalImage = theImageReaderOriginal.GetImage();
char* theOriginalBuffer = new char[theOriginalImage.GetBufferLength()];
if (!theOriginalImage.GetBuffer(theOriginalBuffer)){
std::cerr << "Unable to get original image buffer, stopping." << std::endl;
delete [] theOriginalBuffer;
return 1;
}
//first, check that the image information can be written
//theStreamReader.GetFile().GetDataSet().Print( std::cout );
theStreamWriter.SetFile(theImageReaderOriginal.GetFile());
#if 0
theStreamWriter.SetFileName(outfilename.c_str());
#else
std::ofstream of;
of.open( outfilename.c_str(), std::ios::out | std::ios::binary );
theStreamWriter.SetStream(of);
#endif
if (!theStreamWriter.CanWriteFile()){
delete [] theOriginalBuffer;
return 0;//this means that the file was unwritable, period.
//very similar to a ReadImageInformation failure
}
if (!theStreamWriter.WriteImageInformation()){
std::cerr << "unable to write image information" << std::endl;
delete [] theOriginalBuffer;
return 1; //the CanWrite function should prevent getting here, else,
//that's a test failure
}
std::vector<unsigned int> extent =
gdcm::ImageHelper::GetDimensionsValue(theImageReaderOriginal.GetFile());
unsigned short xmax = (unsigned short)extent[0];
unsigned short ymax = (unsigned short)extent[1];
unsigned short theChunkSize = 4;
unsigned short ychunk = (unsigned short)(extent[1]/theChunkSize); //go in chunk sizes of theChunkSize
unsigned short zmax = (unsigned short)extent[2];
if (xmax == 0 || ymax == 0)
{
std::cerr << "Image has no size, unable to write zero-sized image." << std::endl;
return 0;
}
int z, y, nexty;
unsigned long prevLen = 0; //when going through the char buffer, make sure to grab
//the bytes sequentially. So, store how far you got in the buffer with each iteration.
for (z = 0; z < zmax; ++z){
for (y = 0; y < ymax; y += ychunk){
nexty = y + ychunk;
if (nexty > ymax) nexty = ymax;
theStreamWriter.DefinePixelExtent(0, (uint16_t)xmax, (uint16_t)y, (uint16_t)nexty, (uint16_t)z, (uint16_t)(z+1));
unsigned long len = theStreamWriter.DefineProperBufferLength();
char* finalBuffer = new char[len];
memcpy(finalBuffer, &(theOriginalBuffer[prevLen]), len);
if (!theStreamWriter.Write(finalBuffer, len)){
std::cerr << "writing failure:" << outfilename << " at y = " << y << " and z= " << z << std::endl;
delete [] theOriginalBuffer;
delete [] finalBuffer;
return 1;
}
delete [] finalBuffer;
prevLen += len;
}
}
delete [] theOriginalBuffer;
theImageReader.SetFileName(outfilename.c_str());
if (!theImageReader.Read()){
std::cerr << "unable to read in the written test file: " << outfilename << std::endl;
return 1;
} else {
int res = 0;
const gdcm::Image &img = theImageReader.GetImage();
//std::cerr << "Success to read image from file: " << filename << std::endl;
unsigned long len = img.GetBufferLength();
char* buffer = new char[len];
img.GetBuffer(buffer);
// On big Endian system we have byteswapped the buffer (duh!)
// Since the md5sum is byte based there is now way it would detect
// that the file is written in big endian word, so comparing against
// a md5sum computed on LittleEndian would fail. Thus we need to
// byteswap (again!) here:
const char *ref = gdcm::Testing::GetMD5FromFile(filename);
const char *correct_ref = gdcm::Testing::GetMD5FromBrokenFile(filename);
char digest[33];
gdcm::Testing::ComputeMD5(buffer, len, digest);
if( verbose )
{
std::cout << "ref=" << ref << std::endl;
std::cout << "md5=" << digest << std::endl;
}
if( !ref )
{
// new regression image needs a md5 sum
std::cout << "Missing md5 " << digest << " for: " << filename << std::endl;
//gdcm_assert(0);
res = 1;
}
else if( strcmp(digest, ref) )
{
// let's be nice for now and only truly fails when file is proper DICOM
if( correct_ref && !strcmp(correct_ref, ref))
{
std::cerr << "Problem reading image from: " << filename << std::endl;
std::cerr << "Found " << digest << " instead of " << ref << std::endl;
res = 1;
}
}
delete[] buffer;
return res;
}
}
else
{
//std::cerr << "Unable to read test file: " << filename << std::endl;
//return 1;
return 0; //this is NOT a test of the reader, but a test of streaming writing
}
#if 0
const gdcm::FileMetaInformation &header = reader.GetFile().GetHeader();
gdcm::MediaStorage ms = header.GetMediaStorage();
bool isImage = gdcm::MediaStorage::IsImage( ms );
if( isImage )
{
if( reader.GetFile().GetDataSet().FindDataElement( gdcm::Tag(0x7fe0,0x0010) ) )
{
std::cerr << "Failed to read image from file: " << filename << std::endl;
return 1;
}
else
{
std::cerr << "no Pixel Data Element found in the file:" << filename << std::endl;
return 0;
}
}
// else
// well this is not an image, so thankfully we fail to read it
std::cerr << "Could not read image(" << filename << "), since file is a: " << ms << std::endl;
//gdcm_assert( ms != gdcm::MediaStorage::MS_END );
#endif
return 0;
}
int TestStreamImageWriter(int argc, char *argv[])
{
if( argc == 2 )
{
const char *filename = argv[1];
return TestStreamImageWrite(argv[0], filename, true);
}
// else
// First of get rid of warning/debug message
gdcm::Trace::DebugOff();
gdcm::Trace::WarningOff();
int r = 0, i = 0;
const char *filename;
const char * const *filenames = gdcm::Testing::GetFileNames();
while( (filename = filenames[i]) )
{
r += TestStreamImageWrite( argv[0], filename);
++i;
}
return r;
}