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-rw-r--r--core/fxcrt/include/fx_string.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/core/fxcrt/include/fx_string.h b/core/fxcrt/include/fx_string.h
index e5f9466b21..0aa34171c2 100644
--- a/core/fxcrt/include/fx_string.h
+++ b/core/fxcrt/include/fx_string.h
@@ -134,7 +134,9 @@ inline bool operator==(const char* lhs, const CFX_ByteStringC& rhs) {
inline bool operator!=(const char* lhs, const CFX_ByteStringC& rhs) {
return rhs != lhs;
}
-#define FXBSTR_ID(c1, c2, c3, c4) ((c1 << 24) | (c2 << 16) | (c3 << 8) | (c4))
+#define FXBSTR_ID(c1, c2, c3, c4) \
+ (((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) | ((uint32_t)c3 << 8) | \
+ ((uint32_t)c4))
// A mutable string with shared buffers using copy-on-write semantics that
// avoids the cost of std::string's iterator stability guarantees.