--- leptonlib-1.52/src/readfile.c	2007-11-25 01:15:24.000000000 +0300
+++ leptonlib-1.52.new/src/readfile.c	2007-12-20 13:44:19.000000000 +0300
@@ -276,7 +276,7 @@
 findFileFormat(FILE  *fp)
 {
 l_uint8  firstbytes[12]; 
-l_int32  format;
+l_int32  format, ret;
 
     PROCNAME("findFileFormat");
 
@@ -287,7 +287,10 @@
     if (nbytesInFile(fp) < 12)
         return ERROR_INT("truncated file", procName, 0);
 
-    fread((char *)&firstbytes, 1, 12, fp);
+    ret = fread((char *)&firstbytes, 1, 12, fp);
+    if (ret != 12)
+        return ERROR_INT("failed to read first 12 bytes of file", procName, 0);
+
     rewind(fp);
 
     format = findFileFormatBuffer(firstbytes);