diff options
| -rw-r--r-- | fpdfsdk/src/javascript/global.cpp | 74 |
1 files changed, 66 insertions, 8 deletions
diff --git a/fpdfsdk/src/javascript/global.cpp b/fpdfsdk/src/javascript/global.cpp index f5bc82c1bb..23d8926bd3 100644 --- a/fpdfsdk/src/javascript/global.cpp +++ b/fpdfsdk/src/javascript/global.cpp @@ -17,14 +17,72 @@ /* ---------------------------- global ---------------------------- */ -extern const unsigned int JSCONST_nStringHash = JS_CalcHash(VALUE_NAME_STRING,wcslen(VALUE_NAME_STRING)); -extern const unsigned int JSCONST_nNumberHash = JS_CalcHash(VALUE_NAME_NUMBER,wcslen(VALUE_NAME_NUMBER)); -extern const unsigned int JSCONST_nBoolHash = JS_CalcHash(VALUE_NAME_BOOLEAN,wcslen(VALUE_NAME_BOOLEAN)); -extern const unsigned int JSCONST_nDateHash = JS_CalcHash(VALUE_NAME_DATE,wcslen(VALUE_NAME_DATE)); -extern const unsigned int JSCONST_nObjectHash = JS_CalcHash(VALUE_NAME_OBJECT,wcslen(VALUE_NAME_OBJECT)); -extern const unsigned int JSCONST_nFXobjHash = JS_CalcHash(VALUE_NAME_FXOBJ,wcslen(VALUE_NAME_FXOBJ)); -extern const unsigned int JSCONST_nNullHash = JS_CalcHash(VALUE_NAME_NULL,wcslen(VALUE_NAME_NULL)); -extern const unsigned int JSCONST_nUndefHash = JS_CalcHash(VALUE_NAME_UNDEFINED,wcslen(VALUE_NAME_UNDEFINED)); +// Helper class for compile-time calculation of hash values in order to +// avoid having global object initializers. +template <unsigned ACC, wchar_t... Ns>
+struct CHash;
+
+// Only needed to hash single-character strings.
+template <wchar_t N>
+struct CHash<N> {
+ static const unsigned value = N;
+};
+
+template <unsigned ACC, wchar_t N>
+struct CHash<ACC, N> {
+ static const unsigned value = (ACC * 1313LLU + N) & 0xFFFFFFFF;
+};
+
+template <unsigned ACC, wchar_t N, wchar_t... Ns>
+struct CHash<ACC, N, Ns...> {
+ static const unsigned value = CHash<CHash<ACC, N>::value, Ns...>::value;
+};
+ +extern const unsigned int JSCONST_nStringHash = + CHash<'s','t','r','i','n','g'>::value; +extern const unsigned int JSCONST_nNumberHash = + CHash<'n','u','m','b','e','r'>::value; +extern const unsigned int JSCONST_nBoolHash = + CHash<'b','o','o','l','e','a','n'>::value; +extern const unsigned int JSCONST_nDateHash = + CHash<'d','a','t','e'>::value; +extern const unsigned int JSCONST_nObjectHash = + CHash<'o','b','j','e','c','t'>::value; +extern const unsigned int JSCONST_nFXobjHash = + CHash<'f','x','o','b','j'>::value; +extern const unsigned int JSCONST_nNullHash = + CHash<'n','u','l','l'>::value; +extern const unsigned int JSCONST_nUndefHash = + CHash<'u','n','d','e','f','i','n','e','d'>::value; + +#ifdef _DEBUG +class HashVerify +{ +public: + HashVerify(); +} g_hashVerify; + +HashVerify::HashVerify() +{ + ASSERT(JSCONST_nStringHash == + JS_CalcHash(VALUE_NAME_STRING,wcslen(VALUE_NAME_STRING))); + ASSERT(JSCONST_nNumberHash == + JS_CalcHash(VALUE_NAME_NUMBER,wcslen(VALUE_NAME_NUMBER))); + ASSERT(JSCONST_nBoolHash == + JS_CalcHash(VALUE_NAME_BOOLEAN,wcslen(VALUE_NAME_BOOLEAN))); + ASSERT(JSCONST_nDateHash == + JS_CalcHash(VALUE_NAME_DATE,wcslen(VALUE_NAME_DATE))); + ASSERT(JSCONST_nObjectHash == + JS_CalcHash(VALUE_NAME_OBJECT,wcslen(VALUE_NAME_OBJECT))); + ASSERT(JSCONST_nFXobjHash == + JS_CalcHash(VALUE_NAME_FXOBJ,wcslen(VALUE_NAME_FXOBJ))); + ASSERT(JSCONST_nNullHash == + JS_CalcHash(VALUE_NAME_NULL,wcslen(VALUE_NAME_NULL))); + ASSERT(JSCONST_nUndefHash == + JS_CalcHash(VALUE_NAME_UNDEFINED,wcslen(VALUE_NAME_UNDEFINED))); +} +#endif + BEGIN_JS_STATIC_CONST(CJS_Global) END_JS_STATIC_CONST() |