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Merge pull request #5075 from andir/libutil-base64-init

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libutil: initialize the base64 decode array only once
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Eelco Dolstra 2021-08-06 17:41:11 +02:00 committed by GitHub
parent d64f9671fc b9c9c25766
commit e277c0c479
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 12 deletions
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22
src/libutil/util.cc
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@ -6,14 +6,15 @@
#include <cctype>
#include <cerrno>
#include <climits>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <climits>
#include <future>
#include <iostream>
#include <mutex>
#include <sstream>
#include <thread>
#include <future>
#include <fcntl.h>
#include <grp.h>
@ -1447,7 +1448,7 @@ std::string filterANSIEscapes(const std::string & s, bool filterAll, unsigned in
static char base64Chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static std::array<char, 256> base64DecodeChars;
string base64Encode(std::string_view s)
{
@ -1472,15 +1473,12 @@ string base64Encode(std::string_view s)
string base64Decode(std::string_view s)
{
bool init = false;
char decode[256];
if (!init) {
// FIXME: not thread-safe.
memset(decode, -1, sizeof(decode));
static std::once_flag flag;
std::call_once(flag, [](){
base64DecodeChars = { (char)-1 };
for (int i = 0; i < 64; i++)
decode[(int) base64Chars[i]] = i;
init = true;
}
base64DecodeChars[(int) base64Chars[i]] = i;
});
string res;
unsigned int d = 0, bits = 0;
@ -1489,7 +1487,7 @@ string base64Decode(std::string_view s)
if (c == '=') break;
if (c == '\n') continue;
char digit = decode[(unsigned char) c];
char digit = base64DecodeChars[(unsigned char) c];
if (digit == -1)
throw Error("invalid character in Base64 string: '%c'", c);