cmsfilelength now keeps position of stream

1 files changed, 6 insertions, 2 deletions

diff --git a/src/cmserr.c b/src/cmserr.c
index 5f79328..55f0358 100644
--- a/src/cmserr.c
+++ b/src/cmserr.c
@@ -43,17 +43,21 @@ int CMSEXPORT cmsstrcasecmp(const char* s1, const char* s2)
 // long int because C99 specifies ftell in such way (7.19.9.2)
 long int CMSEXPORT cmsfilelength(FILE* f)
 {
-    long int n;
+    long int p , n; 
+
+    p = ftell(f); // register current file position 
 
 	if (fseek(f, 0, SEEK_END) != 0) {		
 		return -1;
 	}
+
     n = ftell(f);
-    fseek(f, 0, SEEK_SET);
+    fseek(f, p, SEEK_SET); // file position restored 
 
     return n;    
 }
 
+
 // Memory handling ------------------------------------------------------------------
 //
 // This is the interface to low-level memory management routines. By default a simple