General

- Added format auto-detection to most loaders
  - Simplified BaseImporter::CanRead() with some utility methods
  - improved fast_atof -> no overruns anymore. Fuck you, irrlicht.
  - added assimp_cmd tool to allow command line model processing. Mainly adebugging tool for internal purposes, but others might find it useful, too.
  - vc8/vc9: revision number is now written to DLL version header
  - mkutil: some batch scripts to simplify tagging & building of release versions
  - some API cleanup
  - fixing some doxygen markup (+now explicit use of @file <filename>)
  - Icon for assimp_view and assimp_cmd

3DS
  - Normal vectors are not anymore inverted in some cases
  - Improved pivot handling
  - Improved handling of x-flipped meshes

Collada
  - fixed a minor bug (visual_scene element)

LWS 
  - WIP implementation. No animations yet, some bugs and crashes.
  - Animation system remains disabled, WIP code
  - many test files for LWS, but most of them test the anim support, which is, read above, currently disabled.

STL
  - fixing a log warning which appears for every model
  - added binary&ascii test spider, exported from truespace

MD3 
  - Cleaning up output tags for automatically joined player models.


IRR
  - Fixing coordinate system issues. 
  - Instance handling improved.
  - Some of the reported crashes not yet fixed.

PretransformVertices
  - Numerous performance improvements.
  - Added config option to preserve the hierarchy during the step.

RemoveRedundantMaterials
  - Added config option to specify a list of materials which are kept in every case.

UNREAL
  - Added support for the old unreal data format (*.a,*.d,*.uc)
  - tested only with exports from Milkshape
  - more Unreal stuff to come soon



git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@356 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/DXFLoader.cpp

@@ -39,7 +39,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ---------------------------------------------------------------------------
 */
 
-/** @file Implementation of the DXF importer class */
+/** @file  DXFLoader.cpp
+ *  @brief Implementation of the DXF importer class
+ */
 
 #include "AssimpPCH.h"
 #ifndef ASSIMP_BUILD_NO_DXF_IMPORTER
@@ -77,7 +79,7 @@ static aiColor4D g_aclrDxfIndexColors[] =
 #define AI_DXF_NUM_INDEX_COLORS (sizeof(g_aclrDxfIndexColors)/sizeof(g_aclrDxfIndexColors[0]))
 
 // invalid/unassigned color value
-aiColor4D g_clrInvalid = aiColor4D(std::numeric_limits<float>::quiet_NaN(),0.f,0.f,1.f);
+aiColor4D g_clrInvalid = aiColor4D(get_qnan(),0.f,0.f,1.f);
 
 // ------------------------------------------------------------------------------------------------
 // Constructor to be privately used by Importer
@@ -95,19 +97,15 @@ DXFImporter::~DXFImporter()
 
 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file. 
-bool DXFImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
+bool DXFImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
 {
-	// simple check of file extension is enough for the moment
-	std::string::size_type pos = pFile.find_last_of('.');
-	// no file extension - can't read
-	if( pos == std::string::npos)
-		return false;
-	std::string extension = pFile.substr( pos);
+	return SimpleExtensionCheck(pFile,"dxf");
+}
 
-	return !(extension.length() != 4 || extension[0] != '.' ||
-			 extension[1] != 'd' && extension[1] != 'D' ||
-			 extension[2] != 'x' && extension[2] != 'X' ||
-			 extension[3] != 'f' && extension[3] != 'F');
+// ------------------------------------------------------------------------------------------------
+void DXFImporter::GetExtensionList(std::string& append)
+{
+	append.append("*.dxf");
 }
 
 // ------------------------------------------------------------------------------------------------