binder_parcel_fuzzer: faster string creation
Bug: 142473153
Test: binder_parcel_fuzzer execution time reduced by an order of
magnitude for some extreme cases
Change-Id: I0f4a50be4260f968e31068407bc0a7b70ae33a3d
diff --git a/libs/binder/fuzzer/util.cpp b/libs/binder/fuzzer/util.cpp
index b1213e9..479f406 100644
--- a/libs/binder/fuzzer/util.cpp
+++ b/libs/binder/fuzzer/util.cpp
@@ -24,13 +24,17 @@
std::string hexString(const void* bytes, size_t len) {
if (bytes == nullptr) return "<null>";
- std::ostringstream s;
- s << std::hex << std::setfill('0');
+ const uint8_t* bytes8 = static_cast<const uint8_t*>(bytes);
+ char chars[] = "0123456789abcdef";
+ std::string result;
+ result.resize(len * 2);
+
for (size_t i = 0; i < len; i++) {
- s << std::setw(2) << static_cast<int>(
- static_cast<const uint8_t*>(bytes)[i]);
+ result[2 * i] = chars[bytes8[i] >> 4];
+ result[2 * i + 1] = chars[bytes8[i] & 0xf];
}
- return s.str();
+
+ return result;
}
std::string hexString(const std::vector<uint8_t>& bytes) {
return hexString(bytes.data(), bytes.size());