From b6c826571b5f85de9256b0973df29e916c40d243 Mon Sep 17 00:00:00 2001
From: jpr <jpr>
Date: Wed, 12 Mar 2003 13:09:00 +0000
Subject: [PATCH] =?utf8?q?POur=20traiter=20certaines=20(=3F)=20images=20Ph?=
 =?utf8?q?ilips=20pour=20lesquelles=20le=20File=20Preamble=20est=20suivi?=
 =?utf8?q?=20de=20l'elem=20(0002,0001)=20et=20non=20pas=20de=20l'elem=20(0?=
 =?utf8?q?002,0000)=20-pas=20d'autre=20possibilit=E9=20envisageable=20...-?=
 =?utf8?q?=20Peut-etre?=
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

---
 src/Makefile.am    |  6 ++++--
 src/gdcmHeader.cxx | 37 ++++++++++++++++++++++++++++++-------
 src/gdcmHeader.h   |  2 ++
 3 files changed, 36 insertions(+), 9 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index c5506f18..ec064d88 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -26,7 +26,8 @@ libgdcm_la_SOURCES=		\
 	gdcmDictSet.cxx   \
 	gdcmElValSet.cxx  \
 	gdcmHeaderIdo.cxx \
-	gdcmFile.cxx
+	gdcmFile.cxx	\
+	gdcmJpeg.cxx
 
 libgdcmincludedir = $(includedir)
 libgdcminclude_HEADERS = 	\
@@ -34,4 +35,5 @@ libgdcminclude_HEADERS = 	\
 	gdcm.h  	\
 	gdcmException.h	\
 	gdcmIdo.h  	\
-	gdcmUtil.h
+	gdcmUtil.h	\
+	iddcmjpeg.h
diff --git a/src/gdcmHeader.cxx b/src/gdcmHeader.cxx
index 231b5bc4..37b2e1ec 100644
--- a/src/gdcmHeader.cxx
+++ b/src/gdcmHeader.cxx
@@ -13,6 +13,8 @@
 #include "gdcmUtil.h"
 #include "gdcmHeader.h"
 
+#include <iddcmjpeg.h>
+
 // Refer to gdcmHeader::CheckSwap()
 #define HEADER_LENGTH_TO_READ       256
 // Refer to gdcmHeader::SetMaxSizeLoadElementValue()
@@ -128,8 +130,9 @@ void gdcmHeader::CheckSwap()
 
    if(filetype == TrueDicom) {
       // Next, determine the value representation (VR). Let's skip to the
-      // first element (0002, 0000) and check there if we find "UL", in
-      // which case we (almost) know it is explicit VR.
+      // first element (0002, 0000) and check there if we find "UL" 
+      // - or "OB" if the 1st one is (0002,0001) -,
+      // in which case we (almost) know it is explicit VR.
       // WARNING: if it happens to be implicit VR then what we will read
       // is the length of the group. If this ascii representation of this
       // length happens to be "UL" then we shall believe it is explicit VR.
@@ -139,10 +142,12 @@ void gdcmHeader::CheckSwap()
       // We need to skip :
       // * the 128 bytes of File Preamble (often padded with zeroes),
       // * the 4 bytes of "DICM" string,
-      // * the 4 bytes of the first tag (0002, 0000),
+      // * the 4 bytes of the first tag (0002, 0000),or (0002, 0001)
       // i.e. a total of  136 bytes.
       entCur = deb + 136;
-      if(memcmp(entCur, "UL", (size_t)2) == 0) {
+      if(  (memcmp(entCur, "UL", (size_t)2) == 0) ||
+      	   (memcmp(entCur, "OB", (size_t)2) == 0) )
+      	{
          filetype = ExplicitVR;
          dbg.Verbose(1, "gdcmHeader::CheckSwap:",
                      "explicit Value Representation");
@@ -241,7 +246,11 @@ void gdcmHeader::GetPixels(size_t lgrTotale, void* _Pixels) {
    size_t pixelsOffset; 
    pixelsOffset = GetPixelOffset();
    fseek(fp, pixelsOffset, SEEK_SET);
-   fread(_Pixels, 1, lgrTotale, fp);
+   if (IsJPEGLossless()) {
+   	_Pixels=_IdDcmJpegRead(fp);  
+   } else {
+	fread(_Pixels, 1, lgrTotale, fp);
+   }
 }
 
 
@@ -286,7 +295,7 @@ void gdcmHeader::FindVR( ElValue *ElVal) {
    // PostPone this test in an optional integrity check at the end
    // of parsing or only in debug mode.
    if ( RealExplicit && !dicom_vr->count(vr) )
-      RealExplicit = false;
+      RealExplicit= false;
 
    if ( RealExplicit ) {
       if ( ElVal->IsVrUnknown() ) {
@@ -393,7 +402,7 @@ bool gdcmHeader::IsExplicitVRBigEndianTransferSyntax(void) {
       return false;
    LoadElementValueSafe(Element);
    string Transfer = Element->GetValue();
-   if ( Transfer == "1.2.840.10008.1.2.2" )
+   if ( Transfer == "1.2.840.10008.1.2.2" )  //1.2.2 ??? A verifier !
       return true;
    return false;
 }
@@ -416,6 +425,20 @@ bool gdcmHeader::IsJPEGBaseLineProcess1TransferSyntax(void) {
    return false;
 }
 
+// faire qq chose d'intelligent a la place de ça
+
+bool gdcmHeader::IsJPEGLossless(void) {
+   ElValue* Element = PubElVals.GetElementByNumber(0x0002, 0x0010);
+   if ( !Element )
+      return false;
+   LoadElementValueSafe(Element);
+   const char * Transfert = Element->GetValue().c_str();
+   if ( memcmp(Transfert+strlen(Transfert)-2 ,"70",2)==0) return true;
+   if ( memcmp(Transfert+strlen(Transfert)-2 ,"55",2)==0) return true;
+   return false;
+}
+
+
 /**
  * \ingroup gdcmHeader
  * \brief   Determines if the Transfer Syntax was allready encountered
diff --git a/src/gdcmHeader.h b/src/gdcmHeader.h
index 02c58ef6..fa33ebc8 100644
--- a/src/gdcmHeader.h
+++ b/src/gdcmHeader.h
@@ -105,6 +105,8 @@ private:
    bool IsJPEGExtendedProcess2_4TransferSyntax(void); 
    bool IsJPEGExtendedProcess3_5TransferSyntax(void);
    bool IsJPEGSpectralSelectionProcess6_8TransferSyntax(void); 
+   
+   bool IsJPEGLossless(void); 
       
 protected:
    // FIXME: is this enum still necessary ??
-- 
2.48.1