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AK+Userland: Make AK::decode_base64 return ErrorOr

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This commit is contained in:
Sam Atkins 2022-01-20 17:18:17 +00:00 • committed by Andreas Kling
parent f590cd1850
commit c388a879d7
11 changed files with 31 additions and 43 deletions
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25
AK/Base64.cpp
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@ -48,31 +48,24 @@ size_t calculate_base64_encoded_length(ReadonlyBytes input)
return ((4 * input.size() / 3) + 3) & ~3;
}
Optional<ByteBuffer> decode_base64(StringView input)
ErrorOr<ByteBuffer> decode_base64(StringView input)
{
auto get = [&](const size_t offset, bool* is_padding) -> Optional<u8> {
auto get = [&](const size_t offset, bool* is_padding) -> ErrorOr<u8> {
constexpr auto table = make_lookup_table();
if (offset >= input.length())
return 0;
if (input[offset] == '=') {
if (!is_padding)
return {};
return Error::from_string_literal("Invalid '=' character outside of padding in base64 data");
*is_padding = true;
return 0;
}
i16 result = table[static_cast<unsigned char>(input[offset])];
if (result < 0)
return {};
return Error::from_string_literal("Invalid character in base64 data");
VERIFY(result < 256);
return { result };
};
#define TRY_GET(index, is_padding) \
({ \
auto _temporary_result = get(index, is_padding); \
if (!_temporary_result.has_value()) \
return {}; \
_temporary_result.value(); \
})
Vector<u8> output;
output.ensure_capacity(calculate_base64_decoded_length(input));
@ -81,10 +74,10 @@ Optional<ByteBuffer> decode_base64(StringView input)
bool in2_is_padding = false;
bool in3_is_padding = false;
const u8 in0 = TRY_GET(i, nullptr);
const u8 in1 = TRY_GET(i + 1, nullptr);
const u8 in2 = TRY_GET(i + 2, &in2_is_padding);
const u8 in3 = TRY_GET(i + 3, &in3_is_padding);
const u8 in0 = TRY(get(i, nullptr));
const u8 in1 = TRY(get(i + 1, nullptr));
const u8 in2 = TRY(get(i + 2, &in2_is_padding));
const u8 in3 = TRY(get(i + 3, &in3_is_padding));
const u8 out0 = (in0 << 2) | ((in1 >> 4) & 3);
const u8 out1 = ((in1 & 0xf) << 4) | ((in2 >> 2) & 0xf);
@ -97,7 +90,7 @@ Optional<ByteBuffer> decode_base64(StringView input)
output.append(out2);
}
return ByteBuffer::copy(output).release_value_but_fixme_should_propagate_errors();
return ByteBuffer::copy(output);
}
String encode_base64(ReadonlyBytes input)