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LibCompress: Factor out the list of XZ check sizes

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This commit is contained in:
Tim Schumacher 2023-04-01 11:15:42 +02:00 • committed by Andreas Kling
parent b451964bbc
commit 20f1a29202
1 changed files with 22 additions and 15 deletions
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37
Userland/Libraries/LibCompress/Xz.cpp
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@ -175,6 +175,22 @@ XzDecompressor::XzDecompressor(NonnullOwnPtr<CountingStream> stream)
{
}
static Optional<size_t> size_for_check_type(XzStreamCheckType check_type)
{
switch (check_type) {
case XzStreamCheckType::None:
return 0;
case XzStreamCheckType::CRC32:
return 4;
case XzStreamCheckType::CRC64:
return 8;
case XzStreamCheckType::SHA256:
return 32;
default:
return {};
}
}
ErrorOr<Bytes> XzDecompressor::read_some(Bytes bytes)
{
if (m_found_last_stream_footer)
@ -260,23 +276,14 @@ ErrorOr<Bytes> XzDecompressor::read_some(Bytes bytes)
// stored one, the decoder MUST indicate an error. If the selected
// type of Check is not supported by the decoder, it SHOULD
// indicate a warning or error."
auto maybe_check_size = size_for_check_type(m_stream_flags->check_type);
if (!maybe_check_size.has_value())
return Error::from_string_literal("XZ stream has an unknown check type");
// TODO: Block content checks are currently unimplemented as a whole, independent of the check type.
// For now, we only make sure to remove the correct amount of bytes from the stream.
switch (m_stream_flags->check_type) {
case XzStreamCheckType::None:
break;
case XzStreamCheckType::CRC32:
TRY(m_stream->discard(4));
break;
case XzStreamCheckType::CRC64:
TRY(m_stream->discard(8));
break;
case XzStreamCheckType::SHA256:
TRY(m_stream->discard(32));
break;
default:
return Error::from_string_literal("XZ stream has an unknown check type");
}
TRY(m_stream->discard(*maybe_check_size));
}
auto start_of_current_block = m_stream->read_bytes();