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LibCompress+Tests: Demonstrate and fix faulty metadata length

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The test-case is heavily inspired by:
https://github.com/google/brotli/blob/master/tests/testdata/x.compressed.01
Or in words: A metadata meta-block containing `Y` (which should be
ignored), and then the actual data (a single `Z`). The bug used to skip
one metadata byte too few, and thus read garbage.
This commit is contained in:
Ben Wiederhake 2022-09-16 19:21:29 +02:00 • committed by Brian Gianforcaro
parent fe48fed4fa
commit 8de7a91571
4 changed files with 7 additions and 1 deletions
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2
Userland/Libraries/LibCompress/Brotli.cpp
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@ -605,7 +605,7 @@ ErrorOr<Bytes> BrotliDecompressionStream::read(Bytes output_buffer)
return Error::from_string_literal("invalid reserved bit");
size_t skip_bytes = TRY(m_input_stream.read_bits(2));
size_t skip_length = TRY(m_input_stream.read_bits(8 * skip_bytes));
size_t skip_length = 1 + TRY(m_input_stream.read_bits(8 * skip_bytes));
u8 remainder = m_input_stream.align_to_byte_boundary();
if (remainder != 0)