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LibCompress: Fix a bug when wrapping around the buffer.

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asynts 2020-08-31 12:30:16 +02:00 • committed by Andreas Kling
parent 0ebf56efb0
commit 1c8312fa50
2 changed files with 34 additions and 7 deletions
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9
Libraries/LibCompress/Deflate.cpp
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@ -136,13 +136,18 @@ bool DeflateDecompressor::CompressedBlock::try_read_more()
m_eof = true;
return false;
} else {
// FIXME: This assertion depends on user input.
ASSERT(m_distance_codes.has_value());
const auto run_length = m_decompressor.decode_run_length(symbol);
const auto distance = m_decompressor.decode_distance(m_distance_codes.value().read_symbol(m_decompressor.m_input_stream));
auto bytes = m_decompressor.m_output_stream.reserve_contigous_space(run_length);
m_decompressor.m_output_stream.read(bytes, distance + bytes.size());
size_t nread = 0;
while (nread < run_length) {
const auto nreserved = min(run_length - nread, m_decompressor.m_output_stream.remaining_contigous_space());
auto bytes = m_decompressor.m_output_stream.reserve_contigous_space(nreserved);
nread += m_decompressor.m_output_stream.read(bytes, distance + nread + nreserved);
}
return true;
}