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improved scanner interface

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Orange
2025-10-06 14:21:52 +03:00
parent 131fd891b0
commit 170f969697
2 changed files with 39 additions and 25 deletions
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25
source/utility/pattern_scan.cpp
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@@ -8,31 +8,14 @@ namespace omath
{
std::optional<std::span<std::byte>::const_iterator>
PatternScanner::scan_for_pattern(const std::string_view& pattern, const std::span<std::byte>& range)
PatternScanner::scan_for_pattern(const std::span<std::byte>& range, const std::string_view& pattern)
{
const auto parsed_pattern = parse_pattern(pattern);
auto result = scan_for_pattern(range.begin(), range.end(), pattern);
if (!parsed_pattern) [[unlikely]]
if (result == range.end())
return std::nullopt;
const std::ptrdiff_t scan_size =
static_cast<std::ptrdiff_t>(range.size()) - static_cast<std::ptrdiff_t>(pattern.size());
for (std::ptrdiff_t i = 0; i < scan_size; i++)
{
bool found = true;
for (std::ptrdiff_t j = 0; j < static_cast<std::ptrdiff_t>(parsed_pattern->size()); j++)
{
found = parsed_pattern->at(j) == std::nullopt || parsed_pattern->at(j) == *(range.data() + i + j);
if (!found)
break;
}
if (found)
return range.begin() + i;
}
return std::nullopt;
return result;
}
std::expected<std::vector<std::optional<std::byte>>, PatternScanError>
PatternScanner::parse_pattern(const std::string_view& pattern_string)