util/hex.h: Reserve result space in hex_encode()

Reserve enough space for the result of hex_encode() to eliminate reallocations

diff --git a/src/util/hex.h b/src/util/hex.h
index df22539a52673c02c996839de70d1ba522e23329..31bcaa2baad575b2affbd15f137956401e89e2a8 100644 (file)
--- a/src/util/hex.h
+++ b/src/util/hex.h
@@ -26,6 +26,8 @@ static const char hex_chars[] = "0123456789abcdef";
 static inline std::string hex_encode(const char *data, unsigned int data_size)
 {
        std::string ret;
+       ret.reserve(data_size * 2);
+       
        char buf2[3];
        buf2[2] = '\0';