1 files changed, 3 insertions, 4 deletions
diff --git a/fofi/FoFiIdentifier.cc b/fofi/FoFiIdentifier.cc
index 3d41145b..ffe9c47c 100644
--- a/fofi/FoFiIdentifier.cc
+++ b/fofi/FoFiIdentifier.cc
@@ -378,13 +378,12 @@ GBool StreamReader::getUVarBE(int pos, int size, Guint *val) {
 }
 
 GBool StreamReader::cmp(int pos, const char *s) {
-  int n;
-
-  n = (int)strlen(s);
+  const int n = (int)strlen(s);
   if (!fillBuf(pos, n)) {
     return gFalse;
   }
-  return !memcmp(buf - bufPos + pos, s, n);
+  const int posDiff = pos - bufPos;
+  return !memcmp(buf + posDiff, s, n);
 }
 
 GBool StreamReader::fillBuf(int pos, int len) {