Program: gdcm
Module: $RCSfile: gdcmDocument.cxx,v $
Language: C++
- Date: $Date: 2004/06/29 14:38:29 $
- Version: $Revision: 1.43 $
+ Date: $Date: 2004/06/29 23:43:19 $
+ Version: $Revision: 1.44 $
Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
l'Image). All rights reserved. See Doc/License.txt or
*/
std::string gdcmDocument::GetEntryByNumber(guint16 group, guint16 element){
TagKey key = gdcmDictEntry::TranslateToKey(group, element);
-// TODO : use map methods, instead of multimap // JPR
+ /// \todo use map methods, instead of multimap JPR
if ( ! tagHT.count(key))
return GDCM_UNFOUND;
return ((gdcmValEntry *)tagHT.find(key)->second)->GetValue();
if ( ! tagHT.count(key))
return false;
-/* Hope Binary field length is *never* wrong
+/* Hope Binaray field length is *never* wrong
if(lgth%2) // Non even length are padded with a space (020H).
{
lgth++;
guint16 group,
guint16 element)
{
-// TODO : use map methods instead of multimap // JPR
-
+ /// \todo use map methods, instead of multimap JPR
TagKey key = gdcmDictEntry::TranslateToKey(group, element);
if ( ! tagHT.count(key))
return false;
delete[] a;
return NULL;
}
-// TODO : Drop any already existing void area ! // JPR
+ /// \todo Drop any allready existing void area! JPR
SetEntryVoidAreaByNumber(a, Group, Elem);
return a;
}
if (NewDocEntry->GetReadLength()==0xffffffff)
{
// Broken US.3405.1.dcm
- Parse7FE0(); // to skip the pixels
+ Parse7FE0(); // to skip the pixels
// (multipart JPEG/RLE are trouble makers)
}
else
{
dbg.Verbose(1, "gdcmDocument::FindLengthOB: neither an Item tag "
"nor a Sequence delimiter tag.");
+ fseek(fp, PositionOnEntry, SEEK_SET);
errno = 1;
return 0;
}
return UINT32_MAX;
}
-
/**
* \brief Assuming the internal file pointer \ref gdcmDocument::fp
- * is placed at the beginning of a tag (TestGroup, TestElement),
- * read the length associated to the Tag.
+ * is placed at the beginning of a tag check whether this
+ * tag is (TestGroup, TestElement).
* \warning On success the internal file pointer \ref gdcmDocument::fp
- * is modified to point after the tag and it's length.
+ * is modified to point after the tag.
* On failure (i.e. when the tag wasn't the expected tag
* (TestGroup, TestElement) the internal file pointer
* \ref gdcmDocument::fp is restored to it's original position.
* @param TestGroup The expected group of the tag.
* @param TestElement The expected Element of the tag.
- * @return On success returns the length associated to the tag. On failure
- * returns 0.
+ * @return True on success, false otherwise.
*/
-guint32 gdcmDocument::ReadTagLength(guint16 TestGroup, guint16 TestElement)
+bool gdcmDocument::ReadTag(uint16_t TestGroup, uint16_t TestElement)
{
- guint16 ItemTagGroup;
- guint16 ItemTagElement;
+ uint16_t ItemTagGroup;
+ uint16_t ItemTagElement;
long PositionOnEntry = ftell(fp);
long CurrentPosition = ftell(fp); // On debugging purposes
//// Read the Item Tag group and element, and make
- // sure they are respectively 0xfffe and 0xe000:
+ // sure they are what we expected:
ItemTagGroup = ReadInt16();
ItemTagElement = ReadInt16();
if ( (ItemTagGroup != TestGroup) || (ItemTagElement != TestElement ) )
dbg.Verbose(0, "gdcmDocument::ReadItemTagLength: wrong Item Tag found:");
dbg.Verbose(0, s.str().c_str());
fseek(fp, PositionOnEntry, SEEK_SET);
+ return false;
+ }
+ return true;
+}
+
+/**
+ * \brief Assuming the internal file pointer \ref gdcmDocument::fp
+ * is placed at the beginning of a tag (TestGroup, TestElement),
+ * read the length associated to the Tag.
+ * \warning On success the internal file pointer \ref gdcmDocument::fp
+ * is modified to point after the tag and it's length.
+ * On failure (i.e. when the tag wasn't the expected tag
+ * (TestGroup, TestElement) the internal file pointer
+ * \ref gdcmDocument::fp is restored to it's original position.
+ * @param TestGroup The expected group of the tag.
+ * @param TestElement The expected Element of the tag.
+ * @return On success returns the length associated to the tag. On failure
+ * returns 0.
+ */
+uint32_t gdcmDocument::ReadTagLength(uint16_t TestGroup, uint16_t TestElement)
+{
+ long PositionOnEntry = ftell(fp);
+
+ if ( !ReadTag(TestGroup, TestElement) )
+ {
return 0;
}
//// Then read the associated Item Length
- CurrentPosition=ftell(fp);
+ long CurrentPosition = ftell(fp);
guint32 ItemLength;
ItemLength = ReadInt32();
{
return ItemLength;
}
-/**
- * \brief Read the length of an exptected Item tag i.e. (0xfffe, 0xe000).
- * \sa \ref gdcmDocument::ReadTagLength
- * \warning See warning of \ref gdcmDocument::ReadTagLength
- * @return On success returns the length associated to the item tag.
- * On failure returns 0.
- */
-guint32 gdcmDocument::ReadItemTagLength(void)
-{
- return ReadTagLength(0xfffe, 0xe000);
-}
-
-/**
- * \brief Read the length of an expected Sequence Delimiter tag i.e.
- * (0xfffe, 0xe0dd).
- * \sa \ref gdcmDocument::ReadTagLength
- * \warning See warning of \ref gdcmDocument::ReadTagLength
- * @return On success returns the length associated to the Sequence
- * Delimiter tag. On failure returns 0.
- */
-guint32 gdcmDocument::ReadSequenceDelimiterTagLength(void)
-{
- return ReadTagLength(0xfffe, 0xe0dd);
-}
-
-
/**
* \brief Parse pixel data from disk for multi-fragment Jpeg/Rle files
* No other way so 'skip' the Data
*
*/
-
-
-void gdcmDocument::Parse7FE0 (void) {
-
+void gdcmDocument::Parse7FE0 (void)
+{
gdcmDocEntry* Element = GetDocEntryByNumber(0x0002, 0x0010);
if ( !Element )
return;
- std::string Transfer = ((gdcmValEntry *)Element)->GetValue();
- if (Transfer == UI1_2_840_10008_1_2 )
- return;
- if ( Transfer == UI1_2_840_10008_1_2_1 )
- return;
- if ( Transfer == UI1_2_840_10008_1_2_2 ) //1.2.2 ??? A verifier !
- return;
- if ( Transfer == UI1_2_840_10008_1_2_1_99 )
+ if ( IsImplicitVRLittleEndianTransferSyntax()
+ || IsExplicitVRLittleEndianTransferSyntax()
+ || IsExplicitVRBigEndianTransferSyntax() /// \todo 1.2.2 ??? A verifier !
+ || IsDeflatedExplicitVRLittleEndianTransferSyntax() )
return;
-
- int nb;
- std::string str_nb=GetEntryByNumber(0x0028,0x0100);
- if (str_nb == GDCM_UNFOUND ) {
- nb = 16;
- } else {
- nb = atoi(str_nb.c_str() );
- if (nb == 12) nb =16;
- }
-
- guint16 ItemTagGr,ItemTagEl;
- int ln;
- long ftellRes;
- // -------------------- for Parsing : Position on begining of Jpeg/RLE Pixels
+ // ---------------- for Parsing : Position on begining of Jpeg/RLE Pixels
- if ( Transfer != UI1_2_840_10008_1_2_5 ) { // !RLELossLessTransferSyntax
+ //// Read the Basic Offset Table Item Tag length...
+ guint32 ItemLength = ReadTagLength(0xfffe, 0xe000);
+
+ //// ... and then read length[s] itself[themselves]. We don't use
+ // the values read (BTW what is the purpous of those lengths ?)
+ if (ItemLength != 0) {
+ // BTW, what is the purpous of those length anyhow !?
+ char * BasicOffsetTableItemValue = new char[ItemLength + 1];
+ fread(BasicOffsetTableItemValue, ItemLength, 1, fp);
+ for (unsigned int i=0; i < ItemLength; i += 4){
+ guint32 IndividualLength;
+ IndividualLength = str2num(&BasicOffsetTableItemValue[i],guint32);
+ std::ostringstream s;
+ s << " Read one length: ";
+ s << std::hex << IndividualLength << std::endl;
+ dbg.Verbose(0, "gdcmDocument::Parse7FE0: ", s.str().c_str());
+ }
+ }
+
+ if ( ! 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(GetSwapCode()) {
- ItemTagGr=SwapShort(ItemTagGr);
- ItemTagEl=SwapShort(ItemTagEl);
- }
- ftellRes=ftell(fp);
- fread(&ln,4,1,fp);
- if(GetSwapCode())
- ln=SwapLong(ln); // Basic Offset Table Item Length
-
- if (ln != 0) {
- char * BasicOffsetTableItemValue= new char[ln+1];
- fread(BasicOffsetTableItemValue,ln,1,fp);
- guint32 a;
- for (int i=0;i<ln;i+=4){
- a=str2num(&BasicOffsetTableItemValue[i],guint32);
- }
- }
- ftellRes=ftell(fp);
- fread(&ItemTagGr,2,1,fp); // Reading (fffe) : Item Tag Gr
- fread(&ItemTagEl,2,1,fp); // Reading (e000) : Item Tag El
- if(GetSwapCode()) {
- ItemTagGr=SwapShort(ItemTagGr);
- ItemTagEl=SwapShort(ItemTagEl);
- }
-
- while ( ( ItemTagGr==0xfffe) && (ItemTagEl!=0xe0dd) ) { // Parse fragments
-
- ftellRes=ftell(fp);
- fread(&ln,4,1,fp);
- if(GetSwapCode())
- ln=SwapLong(ln); // length
- // ------------------------
- 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(GetSwapCode()) {
- ItemTagGr=SwapShort(ItemTagGr);
- ItemTagEl=SwapShort(ItemTagEl);
- }
+ //// We then skip (not reading them) all the fragments of images:
+ while ( (ItemLength = ReadTagLength(0xfffe, 0xe000)) )
+ {
+ SkipBytes(ItemLength);
}
-
- } else {
-
+ }
+ 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(GetSwapCode()) {
- ItemTagGr=SwapShort(ItemTagGr);
- ItemTagEl=SwapShort(ItemTagEl);
- }
- // Item Length
- ftellRes=ftell(fp);
- fread(&ln,4,1,fp);
- if(GetSwapCode())
- ln=SwapLong(ln); // Basic Offset Table Item Length
- 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;i<ln;i+=4){
- a=str2num(&BasicOffsetTableItemValue[i],guint32);
- }
- }
-
- ftellRes=ftell(fp);
- fread(&ItemTagGr,2,1,fp); // Reading (fffe) : Item Tag Gr
- fread(&ItemTagEl,2,1,fp); // Reading (e000) : Item Tag El
- if(GetSwapCode()) {
- ItemTagGr=SwapShort(ItemTagGr);
- ItemTagEl=SwapShort(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(GetSwapCode())
- fragmentLength=SwapLong(fragmentLength); // length
-
- //------------------ scanning (not reading) fragment pixels
-
- fread(&nbRleSegments,4,1,fp); // Reading : Number of RLE Segments
- if(GetSwapCode())
- nbRleSegments=SwapLong(nbRleSegments);
+ long ftellRes;
+ long RleSegmentLength[15], fragmentLength;
+
+ // While we find some items:
+ while ( (fragmentLength = ReadTagLength(0xfffe, 0xe000)) )
+ {
+ // Parse fragments of the current Fragment (Frame)
+ //------------------ scanning (not reading) fragment pixels
+ guint32 nbRleSegments = ReadInt32();
+ printf(" Nb of RLE Segments : %d\n",nbRleSegments);
- for(int k=1; k<=15; k++) { // Reading RLE Segments Offset Table
+ //// Reading RLE Segments Offset Table
+ guint32 RleSegmentOffsetTable[15];
+ for(int k=1; k<=15; k++) {
ftellRes=ftell(fp);
- fread(&RleSegmentOffsetTable[k],4,1,fp);
- if(GetSwapCode())
- RleSegmentOffsetTable[k]=SwapLong(RleSegmentOffsetTable[k]);
+ RleSegmentOffsetTable[k] = ReadInt32();
+ 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++) {
+ // skipping (not reading) RLE Segments
+ if (nbRleSegments>1) {
+ for(unsigned int k=1; k<=nbRleSegments-1; k++) {
RleSegmentLength[k]= RleSegmentOffsetTable[k+1]
- RleSegmentOffsetTable[k];
ftellRes=ftell(fp);
-
- fseek(fp,RleSegmentLength[k],SEEK_CUR);
+ printf (" Segment %d : Length = %d x(%x) Start at %x\n",
+ k,(unsigned)RleSegmentLength[k],
+ (unsigned)RleSegmentLength[k], (unsigned)ftellRes);
+ SkipBytes(RleSegmentLength[k]);
}
}
+
RleSegmentLength[nbRleSegments]= fragmentLength
- RleSegmentOffsetTable[nbRleSegments];
ftellRes=ftell(fp);
- 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(GetSwapCode()) {
- ItemTagGr=SwapShort(ItemTagGr);
- ItemTagEl=SwapShort(ItemTagEl);
- }
+ printf (" Segment %d : Length = %d x(%x) Start at %x\n",
+ nbRleSegments,(unsigned)RleSegmentLength[nbRleSegments],
+ (unsigned)RleSegmentLength[nbRleSegments],(unsigned)ftellRes);
+ SkipBytes(RleSegmentLength[nbRleSegments]);
}
+
+ // Make sure that at the end of the item we encounter a 'Sequence
+ // Delimiter Item':
+ if ( ! ReadTag(0xfffe, 0xe0dd) )
+ {
+ dbg.Verbose(0, "gdcmDocument::Parse7FE0: no sequence delimiter item");
+ dbg.Verbose(0, " at end of RLE item sequence");
+ }
}
- return;
}
-
+
+
/**
* \brief Compares two documents, according to \ref gdcmDicomDir rules
projects / gdcm.git / commitdiff