Fix MSVC warnings about possible value truncation.

src/ots.cc

Index: src/ots.cc
diff --git a/src/ots.cc b/src/ots.cc
index f364191a59651d2d02bb2195c65349e893eb58f6..e2dd0a29692307f3cbd6b7af76f7ff29348e4d54 100644
--- a/src/ots.cc
+++ b/src/ots.cc
@@ -208,8 +208,8 @@ bool ProcessTTF(ots::OpenTypeFile *header,
   // range_shift is NumTables x 16-searchRange. We know that 16*num_tables
   // doesn't over flow because we range checked it above. Also, we know that
   // it's > header->search_range by construction of search_range.
-  const uint32_t expected_range_shift
-      = 16 * header->num_tables - header->search_range;
+  const uint16_t expected_range_shift =
+      16 * header->num_tables - header->search_range;
   if (header->range_shift != expected_range_shift) {
     OTS_WARNING("bad range shift");
     header->range_shift = expected_range_shift;  // the same as above.
@@ -567,7 +567,7 @@ bool ProcessGeneric(ots::OpenTypeFile *header, uint32_t signature,
     }
   }
 
-  unsigned num_output_tables = 0;
+  uint16_t num_output_tables = 0;
   for (unsigned i = 0; ; ++i) {
     if (table_parsers[i].parse == NULL) {
       break;
@@ -578,7 +578,7 @@ bool ProcessGeneric(ots::OpenTypeFile *header, uint32_t signature,
     }
   }
 
-  unsigned max_pow2 = 0;
+  uint16_t max_pow2 = 0;
   while (1u << (max_pow2 + 1) <= num_output_tables) {
     max_pow2++;
   }