// gdcmParse.cxx //----------------------------------------------------------------------------- #include "gdcmCommon.h" #include "gdcmFile.h" #define str2num(str, typeNum) *((typeNum *)(str)) //----------------------------------------------------------------------------- /** * \ingroup gdcmFile * \brief Parse pixel data from disk and *prints* the result * \ For multi-fragment Jpeg/Rle files checking purpose *only* * \ Allows to 'see' if the file *does* conform * \ (some of them do not) * \ with Dicom Part 3, Annex A (PS 3.5-2003, page 58, page 85) * */ bool gdcmFile::ParsePixelData(void) { // DO NOT remove the printf s. // The ONLY purpose of this method is to PRINT the content FILE *fp; if ( !(fp=Header->OpenFile())) return false; if ( fseek(fp, Header->GetPixelOffset(), SEEK_SET) == -1 ) { Header->CloseFile(); return false; } if ( !Header->IsDicomV3() || Header->IsImplicitVRLittleEndianTransferSyntax() || Header->IsExplicitVRLittleEndianTransferSyntax() || Header->IsExplicitVRBigEndianTransferSyntax() || Header->IsDeflatedExplicitVRLittleEndianTransferSyntax() ) { printf ("gdcmFile::ParsePixelData : non JPEG/RLE File\n"); return false; } int nb; std::string str_nb=Header->GetEntryByNumber(0x0028,0x0100); if (str_nb == GDCM_UNFOUND ) { nb = 16; } else { nb = atoi(str_nb.c_str() ); if (nb == 12) nb =16; } //int nBytes= nb/8; //FIXME //int taille = Header->GetXSize() * Header->GetYSize() * Header->GetSamplesPerPixel(); printf ("Checking the Dicom-encapsulated Jpeg/RLE Pixels\n"); guint16 ItemTagGr,ItemTagEl; int ln; long ftellRes; //char * destination = NULL; // -------------------- for Parsing : Position on begining of Jpeg/RLE Pixels if( !Header->IsRLELossLessTransferSyntax()) { // JPEG Image ftellRes=ftell(fp); fread(&ItemTagGr,2,1,fp); //Reading (fffe):Basic Offset Table Item Tag Gr fread(&ItemTagEl,2,1,fp); //Reading (e000):Basic Offset Table Item Tag El if(Header->GetSwapCode()) { ItemTagGr=Header->SwapShort(ItemTagGr); ItemTagEl=Header->SwapShort(ItemTagEl); } printf ("at %x : ItemTag (should be fffe,e000): %04x,%04x\n", (unsigned)ftellRes,ItemTagGr,ItemTagEl ); ftellRes=ftell(fp); fread(&ln,4,1,fp); if(Header->GetSwapCode()) ln=Header->SwapLong(ln); // Basic Offset Table Item Length printf("at %x : Basic Offset Table Item Length (\?\?) %d x(%08x)\n", (unsigned)ftellRes,ln,ln); if (ln != 0) { // What is it used for ?? char * BasicOffsetTableItemValue= new char[ln+1]; fread(BasicOffsetTableItemValue,ln,1,fp); guint32 a; for (int i=0;iGetSwapCode()) { ItemTagGr=Header->SwapShort(ItemTagGr); ItemTagEl=Header->SwapShort(ItemTagEl); } printf ("at %x : ItemTag (should be fffe,e000 or e0dd): %04x,%04x\n", (unsigned)ftellRes,ItemTagGr,ItemTagEl ); while ( ( ItemTagGr==0xfffe) && (ItemTagEl!=0xe0dd) ) { // Parse fragments ftellRes=ftell(fp); fread(&ln,4,1,fp); if(Header->GetSwapCode()) ln=Header->SwapLong(ln); // length printf(" at %x : fragment length %d x(%08x)\n", (unsigned)ftellRes, ln,ln); // destination += taille * nBytes; // location in user's memory //printf (" Destination will be x(%x) = %d \n", // destination,destination ); // ------------------------ fseek(fp,ln,SEEK_CUR); // skipping (not reading) fragment pixels // ------------------------ ftellRes=ftell(fp); fread(&ItemTagGr,2,1,fp); // Reading (fffe) : Item Tag Gr fread(&ItemTagEl,2,1,fp); // Reading (e000) : Item Tag El if(Header->GetSwapCode()) { ItemTagGr=Header->SwapShort(ItemTagGr); ItemTagEl=Header->SwapShort(ItemTagEl); } printf ("at %x : ItemTag (should be fffe,e000 or e0dd): %04x,%04x\n", (unsigned)ftellRes,ItemTagGr,ItemTagEl ); } } else { // RLE Image long RleSegmentLength[15],fragmentLength; guint32 nbRleSegments; guint32 RleSegmentOffsetTable[15]; ftellRes=ftell(fp); // Basic Offset Table with Item Value // Item Tag fread(&ItemTagGr,2,1,fp); //Reading (fffe):Basic Offset Table Item Tag Gr fread(&ItemTagEl,2,1,fp); //Reading (e000):Basic Offset Table Item Tag El if(Header->GetSwapCode()) { ItemTagGr=Header->SwapShort(ItemTagGr); ItemTagEl=Header->SwapShort(ItemTagEl); } printf ("at %x : ItemTag (should be fffe,e000): %04x,%04x\n", (unsigned)ftellRes,ItemTagGr,ItemTagEl ); // Item Length ftellRes=ftell(fp); fread(&ln,4,1,fp); if(Header->GetSwapCode()) ln=Header->SwapLong(ln); // Basic Offset Table Item Length printf("at %x : Basic Offset Table Item Length (\?\?) %d x(%08x)\n", (unsigned)ftellRes,ln,ln); if (ln != 0) { // What is it used for ?? char * BasicOffsetTableItemValue= new char[ln+1]; fread(BasicOffsetTableItemValue,ln,1,fp); guint32 a; for (int i=0;iGetSwapCode()) { ItemTagGr=Header->SwapShort(ItemTagGr); ItemTagEl=Header->SwapShort(ItemTagEl); } printf ("at %x : ItemTag (should be fffe,e000 or e0dd): %04x,%04x\n", (unsigned)ftellRes,ItemTagGr,ItemTagEl ); // while 'Sequence Delimiter Item' (fffe,e0dd) not found while ( ( ItemTagGr == 0xfffe) && (ItemTagEl != 0xe0dd) ) { // Parse fragments of the current Fragment (Frame) ftellRes=ftell(fp); fread(&fragmentLength,4,1,fp); if(Header->GetSwapCode()) fragmentLength=Header->SwapLong(fragmentLength); // length printf(" at %x : 'fragment' length %d x(%08x)\n", (unsigned)ftellRes, (unsigned)fragmentLength,(unsigned)fragmentLength); //------------------ scanning (not reading) fragment pixels fread(&nbRleSegments,4,1,fp); // Reading : Number of RLE Segments if(Header->GetSwapCode()) nbRleSegments=Header->SwapLong(nbRleSegments); printf(" Nb of RLE Segments : %d\n",nbRleSegments); for(int k=1; k<=15; k++) { // Reading RLE Segments Offset Table ftellRes=ftell(fp); fread(&RleSegmentOffsetTable[k],4,1,fp); if(Header->GetSwapCode()) RleSegmentOffsetTable[k]=Header->SwapLong(RleSegmentOffsetTable[k]); printf(" at : %x Offset Segment %d : %d (%x)\n", (unsigned)ftellRes,k,RleSegmentOffsetTable[k], RleSegmentOffsetTable[k]); } if (nbRleSegments>1) { // skipping (not reading) RLE Segments for(unsigned int k=1; k<=nbRleSegments-1; k++) { RleSegmentLength[k]= RleSegmentOffsetTable[k+1] - RleSegmentOffsetTable[k]; ftellRes=ftell(fp); printf (" Segment %d : Length = %d x(%x) Start at %x\n", k,(unsigned)RleSegmentLength[k],(unsigned)RleSegmentLength[k], (unsigned)ftellRes); fseek(fp,RleSegmentLength[k],SEEK_CUR); } } RleSegmentLength[nbRleSegments]= fragmentLength - RleSegmentOffsetTable[nbRleSegments]; ftellRes=ftell(fp); printf (" Segment %d : Length = %d x(%x) Start at %x\n", nbRleSegments,(unsigned)RleSegmentLength[nbRleSegments], (unsigned)RleSegmentLength[nbRleSegments],(unsigned)ftellRes); fseek(fp,RleSegmentLength[nbRleSegments],SEEK_CUR); // ------------------ end of scanning fragment pixels ftellRes=ftell(fp); fread(&ItemTagGr,2,1,fp); // Reading (fffe) : Item Tag Gr fread(&ItemTagEl,2,1,fp); // Reading (e000) : Item Tag El if(Header->GetSwapCode()) { ItemTagGr=Header->SwapShort(ItemTagGr); ItemTagEl=Header->SwapShort(ItemTagEl); } printf ("at %x : ItemTag (should be fffe,e000 or e0dd): %04x,%04x\n", (unsigned)ftellRes,ItemTagGr,ItemTagEl ); } } return true; } //-----------------------------------------------------------------------------