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cheats: Clamp cheat names without failing

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This commit is contained in:
german77 2023-10-21 21:03:04 -06:00
parent 2e760a9833
commit bbdaa62175
1 changed files with 16 additions and 7 deletions
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23
src/core/memory/cheat_engine.cpp
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@ -19,16 +19,23 @@ namespace Core::Memory {
namespace { namespace {
constexpr auto CHEAT_ENGINE_NS = std::chrono::nanoseconds{1000000000 / 12}; constexpr auto CHEAT_ENGINE_NS = std::chrono::nanoseconds{1000000000 / 12};
std::string_view ExtractName(std::string_view data, std::size_t start_index, char match) { std::string_view ExtractName(std::size_t& out_name_size, std::string_view data,
std::size_t start_index, char match) {
auto end_index = start_index; auto end_index = start_index;
while (data[end_index] != match) { while (data[end_index] != match) {
++end_index; ++end_index;
if (end_index > data.size() || if (end_index > data.size()) {
(end_index - start_index - 1) > sizeof(CheatDefinition::readable_name)) {
return {}; return {};
} }
} }
out_name_size = end_index - start_index;
// Clamp name if it's too big
if (out_name_size > sizeof(CheatDefinition::readable_name)) {
end_index = start_index + sizeof(CheatDefinition::readable_name);
}
return data.substr(start_index, end_index - start_index); return data.substr(start_index, end_index - start_index);
} }
} // Anonymous namespace } // Anonymous namespace
@ -113,7 +120,8 @@ std::vector<CheatEntry> TextCheatParser::Parse(std::string_view data) const {
return {}; return {};
} }
const auto name = ExtractName(data, i + 1, '}'); std::size_t name_size{};
const auto name = ExtractName(name_size, data, i + 1, '}');
if (name.empty()) { if (name.empty()) {
return {}; return {};
} }
@ -125,12 +133,13 @@ std::vector<CheatEntry> TextCheatParser::Parse(std::string_view data) const {
.definition.readable_name[out[*current_entry].definition.readable_name.size() - 1] = .definition.readable_name[out[*current_entry].definition.readable_name.size() - 1] =
'\0'; '\0';
i += name.length() + 1; i += name_size + 1;
} else if (data[i] == '[') { } else if (data[i] == '[') {
current_entry = out.size(); current_entry = out.size();
out.emplace_back(); out.emplace_back();
const auto name = ExtractName(data, i + 1, ']'); std::size_t name_size{};
const auto name = ExtractName(name_size, data, i + 1, ']');
if (name.empty()) { if (name.empty()) {
return {}; return {};
} }
@ -142,7 +151,7 @@ std::vector<CheatEntry> TextCheatParser::Parse(std::string_view data) const {
.definition.readable_name[out[*current_entry].definition.readable_name.size() - 1] = .definition.readable_name[out[*current_entry].definition.readable_name.size() - 1] =
'\0'; '\0';
i += name.length() + 1; i += name_size + 1;
} else if (::isxdigit(data[i])) { } else if (::isxdigit(data[i])) {
if (!current_entry || out[*current_entry].definition.num_opcodes >= if (!current_entry || out[*current_entry].definition.num_opcodes >=
out[*current_entry].definition.opcodes.size()) { out[*current_entry].definition.opcodes.size()) {