[libFuzzer] compute base64 in-process instead of using an external lib. Since libFuzzer should not depend on anything, just re-implement base64 encoder. PR25746
llvm-svn: 254784
diff --git a/llvm/lib/Fuzzer/FuzzerUtil.cpp b/llvm/lib/Fuzzer/FuzzerUtil.cpp
index 20a41e0..6c1133f 100644
--- a/llvm/lib/Fuzzer/FuzzerUtil.cpp
+++ b/llvm/lib/Fuzzer/FuzzerUtil.cpp
@@ -167,4 +167,33 @@
int GetPid() { return getpid(); }
+
+std::string Base64(const Unit &U) {
+ static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+ std::string Res;
+ size_t i;
+ for (i = 0; i + 2 < U.size(); i += 3) {
+ uint32_t x = (U[i] << 16) + (U[i + 1] << 8) + U[i + 2];
+ Res += Table[(x >> 18) & 63];
+ Res += Table[(x >> 12) & 63];
+ Res += Table[(x >> 6) & 63];
+ Res += Table[x & 63];
+ }
+ if (i + 1 == U.size()) {
+ uint32_t x = (U[i] << 16);
+ Res += Table[(x >> 18) & 63];
+ Res += Table[(x >> 12) & 63];
+ Res += "==";
+ } else if (i + 2 == U.size()) {
+ uint32_t x = (U[i] << 16) + (U[i + 1] << 8);
+ Res += Table[(x >> 18) & 63];
+ Res += Table[(x >> 12) & 63];
+ Res += Table[(x >> 6) & 63];
+ Res += "=";
+ }
+ return Res;
+}
+
} // namespace fuzzer