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src: Rewrite util::format_hex

This commit is contained in:
Tatsuhiro Tsujikawa 2014-05-14 23:09:33 +09:00
parent e47b976691
commit 5b4f02dfe0
1 changed files with 10 additions and 12 deletions
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22
src/util.cc
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@ -270,22 +270,20 @@ char upcase(char c)
} }
} }
namespace {
const char LOWER_XDIGITS[] = "0123456789abcdef";
} // namespace
std::string format_hex(const unsigned char *s, size_t len) std::string format_hex(const unsigned char *s, size_t len)
{ {
std::string res; std::string res;
res.resize(len * 2);
for(size_t i = 0; i < len; ++i) { for(size_t i = 0; i < len; ++i) {
unsigned char c = s[i] >> 4; unsigned char c = s[i];
if(c > 9) {
res += c - 10 + 'a'; res[i * 2] = LOWER_XDIGITS[c >> 4];
} else { res[i * 2 + 1] = LOWER_XDIGITS[c & 0x0f];
res += c + '0';
}
c = s[i] & 0xf;
if(c > 9) {
res += c - 10 + 'a';
} else {
res += c + '0';
}
} }
return res; return res;
} }