54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// Copyright 2022 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include <packager/utils/hex_parser.h>
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#include <absl/strings/escaping.h>
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#include <absl/types/span.h>
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namespace shaka {
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void HexStringToBytes(const std::string& hex, std::vector<uint8_t>* bytes) {
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std::string raw = absl::HexStringToBytes(hex);
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absl::string_view str_view(raw);
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absl::Span<const uint8_t> span(
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reinterpret_cast<const uint8_t*>(str_view.data()), str_view.size());
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*bytes = std::vector<uint8_t>(span.begin(), span.end());
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}
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bool ValidHexStringToBytes(const std::string& hex,
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std::vector<uint8_t>* bytes) {
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std::string raw;
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if (!ValidHexStringToBytes(hex, &raw))
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return false;
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absl::string_view str_view(raw);
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absl::Span<const uint8_t> span(
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reinterpret_cast<const uint8_t*>(str_view.data()), str_view.size());
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*bytes = std::vector<uint8_t>(span.begin(), span.end());
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return true;
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}
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bool ValidHexStringToBytes(const std::string& hex, std::string* bytes) {
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// absl::HexStringToBytes will not validate the string! Any invalid byte
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// sequence will be converted into NUL characters silently. So we do our own
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// validation here.
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for (char c : hex) {
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c = static_cast<char>(std::tolower(c));
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if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f')) {
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// valid
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} else {
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return false;
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}
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}
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*bytes = absl::HexStringToBytes(hex);
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return true;
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}
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} // namespace shaka
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