Fixed typo BIGENDIAN -> BIG_ENDIAN

Author: taku910

src/builder.cc

@@ -293,6 +293,13 @@ util::Status Builder::GetPrecompiledCharsMap(absl::string_view name,
     return util::OkStatus();
   }
 
+  if (!std::all_of(name.begin(), name.end(), [](auto c) {
+        return (c >= 'a' && c <= 'z') || c == '_' || c == '-';
+      })) {
+    return util::StatusBuilder(util::StatusCode::kInvalidArgument, GTL_LOC)
+           << "Invalid charsmap name " << name;
+  }
+
   std::string result;
 
 #ifndef DISABLE_EMBEDDED_DATA

src/common.h

@@ -74,11 +74,11 @@ inline uint32_t Swap32(uint32_t x) {
 }  // namespace util
 
 constexpr bool is_bigendian() {
-#ifdef IS_BIGENDIAN
+#ifdef IS_BIG_ENDIAN
   return true;
-#else   // IS_BIGENDIAN
+#else   // IS_BIG_ENDIAN
   return false;
-#endif  // IS_BIGENDIAN
+#endif  // IS_BIG_ENDIAN
 }
 
 namespace error {