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AK: Make LEB128 decoding work with read_value

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Tim Schumacher 2023-01-30 00:02:38 +01:00 • committed by Andrew Kaster
parent 787f4d639a
commit 47531a42a9
9 changed files with 135 additions and 148 deletions
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32
AK/LEB128.h
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@ -12,11 +12,22 @@
namespace AK {
struct LEB128 {
template<typename ValueType = size_t>
static ErrorOr<void> read_unsigned(AK::Stream& stream, ValueType& result)
template<typename ValueType>
class [[gnu::packed]] LEB128 {
public:
constexpr LEB128() = default;
constexpr LEB128(ValueType value)
: m_value(value)
{
result = 0;
}
constexpr operator ValueType() const { return m_value; }
static ErrorOr<LEB128<ValueType>> read_from_stream(AK::Stream& stream)
requires(Unsigned<ValueType>)
{
ValueType result {};
size_t num_bytes = 0;
while (true) {
if (stream.is_eof())
@ -39,11 +50,11 @@ struct LEB128 {
++num_bytes;
}
return {};
return LEB128<ValueType> { result };
}
template<typename ValueType = ssize_t>
static ErrorOr<void> read_signed(AK::Stream& stream, ValueType& result)
static ErrorOr<LEB128<ValueType>> read_from_stream(AK::Stream& stream)
requires(Signed<ValueType>)
{
// Note: We read into a u64 to simplify the parsing logic;
// result is range checked into ValueType after parsing.
@ -52,7 +63,7 @@ struct LEB128 {
i64 temp = 0;
size_t num_bytes = 0;
u8 byte = 0;
result = 0;
ValueType result {};
do {
if (stream.is_eof())
@ -87,8 +98,11 @@ struct LEB128 {
result = static_cast<ValueType>(temp);
return {};
return LEB128<ValueType> { result };
}
private:
ValueType m_value { 0 };
};
}