From b3ea8ccb7af475703b97246a2baf2e105d24d6f9 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Tue, 7 Nov 2017 14:24:30 -0800
Subject: Simplify Base32 and Base64 conversions

---
 src/key_io.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/key_io.cpp')

diff --git a/src/key_io.cpp b/src/key_io.cpp
index 0cc4927679..c2dc511989 100644
--- a/src/key_io.cpp
+++ b/src/key_io.cpp
@@ -43,6 +43,7 @@ public:
     std::string operator()(const WitnessV0KeyHash& id) const
     {
         std::vector<unsigned char> data = {0};
+        data.reserve(33);
         ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.begin(), id.end());
         return bech32::Encode(m_params.Bech32HRP(), data);
     }
@@ -50,6 +51,7 @@ public:
     std::string operator()(const WitnessV0ScriptHash& id) const
     {
         std::vector<unsigned char> data = {0};
+        data.reserve(53);
         ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.begin(), id.end());
         return bech32::Encode(m_params.Bech32HRP(), data);
     }
@@ -60,6 +62,7 @@ public:
             return {};
         }
         std::vector<unsigned char> data = {(unsigned char)id.version};
+        data.reserve(1 + (id.length * 8 + 4) / 5);
         ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.program, id.program + id.length);
         return bech32::Encode(m_params.Bech32HRP(), data);
     }
@@ -94,6 +97,7 @@ CTxDestination DecodeDestination(const std::string& str, const CChainParams& par
         // Bech32 decoding
         int version = bech.second[0]; // The first 5 bit symbol is the witness version (0-16)
         // The rest of the symbols are converted witness program bytes.
+        data.reserve(((bech.second.size() - 1) * 5) / 8);
         if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, bech.second.begin() + 1, bech.second.end())) {
             if (version == 0) {
                 {
-- 
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