Roundtrip CMM, platform, and creator tags

This fixes generated MD5 checksums of existing profiles not matching
between Windows and Unix-based systems.

2 files changed, 25 insertions, 10 deletions

diff --git a/src/cmsio0.c b/src/cmsio0.c
index 945140a..75442e6 100644
--- a/src/cmsio0.c
+++ b/src/cmsio0.c
@@ -530,7 +530,21 @@ cmsHPROFILE CMSEXPORT cmsCreateProfilePlaceholder(cmsContext ContextID)
 
     // Set default version
     Icc ->Version =  0x02100000;
-    
+
+    // Set default CMM (that's me!)
+    Icc ->CMM = lcmsSignature;
+
+    // Set default creator
+    // Created by LittleCMS (that's me!)
+    Icc ->creator = lcmsSignature;
+
+    // Set default platform
+#ifdef CMS_IS_WINDOWS_
+    Icc ->platform = cmsSigMicrosoft;
+#else
+    Icc ->platform = cmsSigMacintosh;
+#endif
+
     // Set default device class
     Icc->DeviceClass = cmsSigDisplayClass;
 
@@ -784,16 +798,18 @@ cmsBool _cmsReadHeader(_cmsICCPROFILE* Icc)
     }
 
     // Adjust endianness of the used parameters
+    Icc -> CMM             = _cmsAdjustEndianess32(Header.cmmId);
     Icc -> DeviceClass     = (cmsProfileClassSignature) _cmsAdjustEndianess32(Header.deviceClass);
     Icc -> ColorSpace      = (cmsColorSpaceSignature)   _cmsAdjustEndianess32(Header.colorSpace);
     Icc -> PCS             = (cmsColorSpaceSignature)   _cmsAdjustEndianess32(Header.pcs);
    
     Icc -> RenderingIntent = _cmsAdjustEndianess32(Header.renderingIntent);
+    Icc -> platform        = (cmsPlatformSignature)_cmsAdjustEndianess32(Header.platform);
     Icc -> flags           = _cmsAdjustEndianess32(Header.flags);
     Icc -> manufacturer    = _cmsAdjustEndianess32(Header.manufacturer);
     Icc -> model           = _cmsAdjustEndianess32(Header.model);
     Icc -> creator         = _cmsAdjustEndianess32(Header.creator);
-    
+
     _cmsAdjustEndianess64(&Icc -> attributes, &Header.attributes);
     Icc -> Version         = _cmsAdjustEndianess32(_validatedVersion(Header.version));
 
@@ -893,7 +909,7 @@ cmsBool _cmsWriteHeader(_cmsICCPROFILE* Icc, cmsUInt32Number UsedSpace)
     cmsUInt32Number Count;
 
     Header.size        = _cmsAdjustEndianess32(UsedSpace);
-    Header.cmmId       = _cmsAdjustEndianess32(lcmsSignature);
+    Header.cmmId       = _cmsAdjustEndianess32(Icc ->CMM);
     Header.version     = _cmsAdjustEndianess32(Icc ->Version);
 
     Header.deviceClass = (cmsProfileClassSignature) _cmsAdjustEndianess32(Icc -> DeviceClass);
@@ -905,11 +921,7 @@ cmsBool _cmsWriteHeader(_cmsICCPROFILE* Icc, cmsUInt32Number UsedSpace)
 
     Header.magic       = _cmsAdjustEndianess32(cmsMagicNumber);
 
-#ifdef CMS_IS_WINDOWS_
-    Header.platform    = (cmsPlatformSignature) _cmsAdjustEndianess32(cmsSigMicrosoft);
-#else
-    Header.platform    = (cmsPlatformSignature) _cmsAdjustEndianess32(cmsSigMacintosh);
-#endif
+    Header.platform    = (cmsPlatformSignature) _cmsAdjustEndianess32(Icc -> platform);
 
     Header.flags        = _cmsAdjustEndianess32(Icc -> flags);
     Header.manufacturer = _cmsAdjustEndianess32(Icc -> manufacturer);
@@ -925,8 +937,7 @@ cmsBool _cmsWriteHeader(_cmsICCPROFILE* Icc, cmsUInt32Number UsedSpace)
     Header.illuminant.Y = (cmsS15Fixed16Number) _cmsAdjustEndianess32((cmsUInt32Number) _cmsDoubleTo15Fixed16(cmsD50_XYZ()->Y));
     Header.illuminant.Z = (cmsS15Fixed16Number) _cmsAdjustEndianess32((cmsUInt32Number) _cmsDoubleTo15Fixed16(cmsD50_XYZ()->Z));
 
-    // Created by LittleCMS (that's me!)
-    Header.creator      = _cmsAdjustEndianess32(lcmsSignature);
+    Header.creator      = _cmsAdjustEndianess32(Icc ->creator);
 
     memset(&Header.reserved, 0, sizeof(Header.reserved));
 
diff --git a/src/lcms2_internal.h b/src/lcms2_internal.h
index 1fc99fb..230a420 100644
--- a/src/lcms2_internal.h
+++ b/src/lcms2_internal.h
@@ -811,6 +811,9 @@ typedef struct _cms_iccprofile_struct {
     // Creation time
     struct tm                Created;
 
+    // Color management module identification
+    cmsUInt32Number          CMM;
+
     // Only most important items found in ICC profiles
     cmsUInt32Number          Version;
     cmsProfileClassSignature DeviceClass;
@@ -818,6 +821,7 @@ typedef struct _cms_iccprofile_struct {
     cmsColorSpaceSignature   PCS;
     cmsUInt32Number          RenderingIntent;
 
+    cmsPlatformSignature     platform;
     cmsUInt32Number          flags;
     cmsUInt32Number          manufacturer, model;
     cmsUInt64Number          attributes;