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bytes.cc
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bytes.cc
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/*
* Copyright (C) 2014-present ScyllaDB
*/
/*
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include "bytes.hh"
#include <seastar/core/print.hh>
static inline int8_t hex_to_int(unsigned char c) {
switch (c) {
case '0': return 0;
case '1': return 1;
case '2': return 2;
case '3': return 3;
case '4': return 4;
case '5': return 5;
case '6': return 6;
case '7': return 7;
case '8': return 8;
case '9': return 9;
case 'a': case 'A': return 10;
case 'b': case 'B': return 11;
case 'c': case 'C': return 12;
case 'd': case 'D': return 13;
case 'e': case 'E': return 14;
case 'f': case 'F': return 15;
default:
return -1;
}
}
bytes from_hex(sstring_view s) {
if (s.length() % 2 == 1) {
throw std::invalid_argument("An hex string representing bytes must have an even length");
}
bytes out{bytes::initialized_later(), s.length() / 2};
unsigned end = out.size();
for (unsigned i = 0; i != end; i++) {
auto half_byte1 = hex_to_int(s[i * 2]);
auto half_byte2 = hex_to_int(s[i * 2 + 1]);
if (half_byte1 == -1 || half_byte2 == -1) {
throw std::invalid_argument(fmt::format("Non-hex characters in {}", s));
}
out[i] = (half_byte1 << 4) | half_byte2;
}
return out;
}
sstring to_hex(bytes_view b) {
return fmt::to_string(fmt_hex(b));
}
sstring to_hex(const bytes& b) {
return to_hex(bytes_view(b));
}
sstring to_hex(const bytes_opt& b) {
return !b ? "null" : to_hex(*b);
}
namespace std {
std::ostream& operator<<(std::ostream& os, const bytes_view& b) {
fmt::print(os, "{}", fmt_hex(b));
return os;
}
}