@@ -41,6 +41,24 @@ std::optional<T> parse(std::istream &&is) {
return parse<T>(is);
}
// https://webassembly.github.io/spec/core/binary/values.html#names
template<>
std::optional<std::string> parse(std::istream &is) {
auto length = Leb128<std::uint32_t>::decode_from(is);
if (!length) {
return std::nullopt;
}
std::string str;
str.resize(*length);
// TODO(robinlinden): Handle non-ascii. This needs to be valid UTF-8.
if (!is.read(str.data(), *length) || std::ranges::any_of(str, [](char c) { return c > 0x79; })) {
return std::nullopt;
}
return str;
}
template<>
std::optional<std::uint32_t> parse(std::istream &is) {
auto v = Leb128<std::uint32_t>::decode_from(is);
@@ -177,22 +195,10 @@ std::optional<TableType> parse(std::istream &is) {
// https://webassembly.github.io/spec/core/binary/modules.html#binary-exportsec
template<>
std::optional<Export> parse(std::istream &is) {
// https://webassembly.github.io/spec/core/binary/values.html#names
auto name_length = Leb128<std::uint32_t>::decode_from(is);
if (!name_length) {
auto name = parse<std::string>(is);
if (!name) {
return std::nullopt;
}
std::string name;
name.reserve(*name_length);
for (std::uint32_t i = 0; i < *name_length; ++i) {
// TODO(robinlinden): Handle non-ascii.
char c{};
if (!is.read(reinterpret_cast<char *>(&c), sizeof(c)) || c > 0x79) {
return std::nullopt;
}
name += c;
}
std::uint8_t type{};
if (!is.read(reinterpret_cast<char *>(&type), sizeof(type)) || type > 0x03) {
@@ -205,7 +211,7 @@ std::optional<Export> parse(std::istream &is) {
}
return Export{
.name = std::move(name),
.name = *std::move(name),
.type = static_cast<Export::Type>(type),
.index = *index,
};