mirror of
https://github.com/scylladb/scylladb.git
synced 2026-05-30 11:36:54 +00:00
a2fff12bcd
A thin facade over managed_bytes[_view], offering some extra convenience for working with strings, as well as a strong type communicating the purpose (storing text instead of a blob). Also introduces utils::from_hex(chunked_string_view), a fragmented hex-decode that operates directly on a chunked_string_view without requiring linearization. Hex pairs straddling fragment boundaries are handled via a carry-over nibble.
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/*
|
|
* Copyright (C) 2026-present ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
|
|
*/
|
|
|
|
#include "utils/chunked_string.hh"
|
|
|
|
namespace utils {
|
|
|
|
sstring chunked_string::linearize() const {
|
|
return _data.with_linearized([&] (bytes_view bv) {
|
|
return sstring(to_string_view(bv));
|
|
});
|
|
}
|
|
|
|
managed_bytes from_hex(utils::chunked_string_view view) {
|
|
if (view.size() % 2) {
|
|
throw std::invalid_argument("A hex string representing bytes must have an even length");
|
|
}
|
|
managed_bytes result{managed_bytes::initialized_later(), view.size() / 2};
|
|
managed_bytes_mutable_view dest(result);
|
|
// A hex pair may straddle a fragment boundary, so carry over an unpaired nibble.
|
|
std::optional<char> carry;
|
|
for (auto frag : fragment_range(view.data())) {
|
|
auto v = std::string_view(reinterpret_cast<const char*>(frag.data()), frag.size());
|
|
size_t start = 0;
|
|
if (carry) {
|
|
// Complete the straddling pair using the first char of this fragment.
|
|
char pair[2] = {*carry, v[0]};
|
|
write_fragmented(dest, single_fragmented_view(::from_hex(std::string_view(pair, 2))));
|
|
carry.reset();
|
|
start = 1;
|
|
}
|
|
size_t len = v.size() - start;
|
|
if (len % 2) {
|
|
// Odd number of chars remaining: park the last one for the next fragment.
|
|
carry = v[start + len - 1];
|
|
--len;
|
|
}
|
|
write_fragmented(dest, single_fragmented_view(::from_hex(v.substr(start, len))));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
} // namespace utils
|