add some profile class definitions from iccMAX

Author: mm2

include/lcms2.h

@@ -504,7 +504,13 @@ typedef enum {
     cmsSigLinkClass                         = 0x6C696E6B,  // 'link'
     cmsSigAbstractClass                     = 0x61627374,  // 'abst'
     cmsSigColorSpaceClass                   = 0x73706163,  // 'spac'
-    cmsSigNamedColorClass                   = 0x6e6d636c   // 'nmcl'
+    cmsSigNamedColorClass                   = 0x6e6d636c,  // 'nmcl'
+
+                                                            // iccMAX only
+    cmsSigColorEncodingSpaceClass           = 0x63656E63,  // 'cenc' 
+    cmsSigMultiplexIdentificationClass      = 0x6D696420,  // 'mid '
+    cmsSigMultiplexLinkClass                = 0x6d6c6e6b,  // 'mlnk'
+    cmsSigMultiplexVisualizationClass       = 0x6d766973   // 'mvis'    
 
 } cmsProfileClassSignature;
 

src/cmsio0.c

@@ -774,7 +774,8 @@ cmsUInt32Number _validatedVersion(cmsUInt32Number DWord)
 static 
 cmsBool validDeviceClass(cmsProfileClassSignature cl)
 {
-    if ((int)cl == 0) return TRUE; // We allow zero because older lcms versions defaulted to that.
+    if (cl == (cmsProfileClassSignature)0) 
+        return TRUE; // We allow zero because older lcms versions defaulted to that.
 
     switch (cl)
     {    
@@ -785,6 +786,10 @@ cmsBool validDeviceClass(cmsProfileClassSignature cl)
     case cmsSigAbstractClass:
     case cmsSigColorSpaceClass:
     case cmsSigNamedColorClass:
+    case cmsSigColorEncodingSpaceClass:
+    case cmsSigMultiplexIdentificationClass:
+    case cmsSigMultiplexLinkClass:
+    case cmsSigMultiplexVisualizationClass:
         return TRUE;
 
     default: