a606606ac4
some of these helpers prints a byte array using `to_hex()`, which materializes a string instance and then drop it on the floor after printing it to the given ostream. this hurts the performance, so `fmt::print()` should be more performant in comparison to the implementations based on `to_hex()`. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
/*
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* Copyright (C) 2014-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include "bytes.hh"
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#include <seastar/core/print.hh>
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static inline int8_t hex_to_int(unsigned char c) {
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switch (c) {
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case '0': return 0;
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case '1': return 1;
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case '2': return 2;
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case '3': return 3;
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case '4': return 4;
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case '5': return 5;
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case '6': return 6;
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case '7': return 7;
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case '8': return 8;
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case '9': return 9;
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case 'a': case 'A': return 10;
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case 'b': case 'B': return 11;
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case 'c': case 'C': return 12;
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case 'd': case 'D': return 13;
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case 'e': case 'E': return 14;
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case 'f': case 'F': return 15;
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default:
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return -1;
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}
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}
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bytes from_hex(sstring_view s) {
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if (s.length() % 2 == 1) {
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throw std::invalid_argument("An hex string representing bytes must have an even length");
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}
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bytes out{bytes::initialized_later(), s.length() / 2};
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unsigned end = out.size();
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for (unsigned i = 0; i != end; i++) {
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auto half_byte1 = hex_to_int(s[i * 2]);
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auto half_byte2 = hex_to_int(s[i * 2 + 1]);
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if (half_byte1 == -1 || half_byte2 == -1) {
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throw std::invalid_argument(format("Non-hex characters in {}", s));
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}
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out[i] = (half_byte1 << 4) | half_byte2;
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}
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return out;
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}
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sstring to_hex(bytes_view b) {
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return fmt::to_string(fmt_hex(b));
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}
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sstring to_hex(const bytes& b) {
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return to_hex(bytes_view(b));
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}
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sstring to_hex(const bytes_opt& b) {
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return !b ? "null" : to_hex(*b);
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}
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std::ostream& operator<<(std::ostream& os, const bytes& b) {
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fmt::print(os, "{}", b);
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return os;
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}
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std::ostream& operator<<(std::ostream& os, const bytes_opt& b) {
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if (b) {
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fmt::print(os, "{}", *b);
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return os;
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}
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return os << "null";
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}
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namespace std {
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std::ostream& operator<<(std::ostream& os, const bytes_view& b) {
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fmt::print(os, "{}", fmt_hex(b));
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return os;
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}
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}
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std::ostream& operator<<(std::ostream& os, const fmt_hex& b) {
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fmt::print(os, "{}", b);
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return os;
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}
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