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https://github.com/scylladb/scylladb.git
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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++
/*
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* Copyright (C) 2026-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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#include "utils/chunked_string.hh"
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namespace utils {
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sstring chunked_string::linearize() const {
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return _data.with_linearized([&] (bytes_view bv) {
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return sstring(to_string_view(bv));
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});
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}
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managed_bytes from_hex(utils::chunked_string_view view) {
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if (view.size() % 2) {
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throw std::invalid_argument("A hex string representing bytes must have an even length");
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}
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managed_bytes result{managed_bytes::initialized_later(), view.size() / 2};
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managed_bytes_mutable_view dest(result);
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// A hex pair may straddle a fragment boundary, so carry over an unpaired nibble.
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std::optional<char> carry;
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for (auto frag : fragment_range(view.data())) {
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auto v = std::string_view(reinterpret_cast<const char*>(frag.data()), frag.size());
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size_t start = 0;
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if (carry) {
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// Complete the straddling pair using the first char of this fragment.
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char pair[2] = {*carry, v[0]};
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write_fragmented(dest, single_fragmented_view(::from_hex(std::string_view(pair, 2))));
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carry.reset();
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start = 1;
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}
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size_t len = v.size() - start;
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if (len % 2) {
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// Odd number of chars remaining: park the last one for the next fragment.
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carry = v[start + len - 1];
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--len;
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}
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write_fragmented(dest, single_fragmented_view(::from_hex(v.substr(start, len))));
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}
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return result;
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}
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} // namespace utils
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