fix reading files

testFutureProofing and testMultiPartFileMixingBasic both use fread(&length,4,f) to get a 4 byte
integer value from input file. The value read is not converted from the little endian format to
the machine format causing problems (eg. test didn't finish after 24 hours).

fixes issue AcademySoftwareFoundation#81

OpenEXR/IlmImfTest/testFutureProofing.cpp

@@ -40,6 +40,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <byteswap.h>
 
 #include "tmpDir.h"
 #include "testFutureProofing.h"
@@ -64,6 +65,7 @@
 #include <ImfNamespace.h>
 #include <ImathNamespace.h>
 #include <IlmThreadNamespace.h>
+#include <ImfSystemSpecific.h>
 
 namespace IMF = OPENEXR_IMF_NAMESPACE;
 using namespace IMF;
@@ -1234,6 +1236,12 @@ modifyType (bool modify_version)
 
             //length of attribute
             fread(&length,4,1,f);
+            if (!GLOBAL_SYSTEM_LITTLE_ENDIAN)
+            {
+                int tmp = bswap_32(length);
+        	length = tmp;
+            }
+
             if(!modify_version && attrib_name=="type")
             {
                 // modify the type of part 1 to be 'X<whatevever>'

OpenEXR/IlmImfTest/testMultiPartFileMixingBasic.cpp

@@ -40,6 +40,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <byteswap.h>
 
 #include "tmpDir.h"
 #include "testMultiPartFileMixingBasic.h"
@@ -59,6 +60,7 @@
 #include <ImfDeepScanLineInputPart.h>
 #include <ImfPartType.h>
 #include <ImfMisc.h>
+#include <ImfSystemSpecific.h>
 
 namespace IMF = OPENEXR_IMF_NAMESPACE;
 using namespace IMF;
@@ -1383,6 +1385,11 @@ killOffsetTables (const std::string & fn)
 
             //length of attribute
             fread(&length,4,1,f);
+    	    if (!GLOBAL_SYSTEM_LITTLE_ENDIAN)
+    	    {
+    		int tmp = bswap_32(length);
+    		length = tmp;
+    	    }
 
             //value of attribute
             for(int i=0;i<length;i++)