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Orange
064edf9ef1
Skips processing when encountering an empty string slice during pattern scanning. This prevents unexpected behavior and potential errors when the pattern string contains sections that result in an empty byte string.
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
//
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// Created by Vlad on 10/4/2025.
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//
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#include "omath/utility/pattern_scan.hpp"
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#include <charconv>
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namespace omath
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{
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std::expected<std::vector<std::optional<std::byte>>, PatternScanError>
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PatternScanner::parse_pattern(const std::string_view& pattern_string)
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{
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std::vector<std::optional<std::byte>> pattern;
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auto start = pattern_string.cbegin();
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while (start != pattern_string.cend())
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{
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const auto end = std::find(start, pattern_string.cend(), ' ');
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const auto sting_view_start = std::distance(pattern_string.cbegin(), start);
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const auto sting_view_end = std::distance(start, end);
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const std::string_view byte_str = pattern_string.substr(sting_view_start, sting_view_end);
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if (byte_str.empty())
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{
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start = end != pattern_string.end() ? std::next(end) : end;
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continue;
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}
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if (byte_str == "?" || byte_str == "??")
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{
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pattern.emplace_back(std::nullopt);
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start = end != pattern_string.end() ? std::next(end) : end;
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continue;
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}
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std::uint8_t value = 0;
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// ReSharper disable once CppTooWideScopeInitStatement
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const auto [_, error_code] = std::from_chars(byte_str.data(), byte_str.data()+byte_str.size(), value, 16);
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if (error_code != std::errc{})
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return std::unexpected(PatternScanError::INVALID_PATTERN_STRING);
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pattern.emplace_back(static_cast<std::byte>(value));
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start = end != pattern_string.end() ? std::next(end) : end;
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}
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return pattern;
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}
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} // namespace omath
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