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LibCompress: Factor out the list of XZ check sizes
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parent
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commit
20f1a29202
Notes:
sideshowbarker
2024-07-16 22:17:03 +09:00
Author: https://github.com/timschumi Commit: https://github.com/SerenityOS/serenity/commit/20f1a29202 Pull-request: https://github.com/SerenityOS/serenity/pull/18126
@ -175,6 +175,22 @@ XzDecompressor::XzDecompressor(NonnullOwnPtr<CountingStream> stream)
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{
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}
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static Optional<size_t> size_for_check_type(XzStreamCheckType check_type)
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{
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switch (check_type) {
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case XzStreamCheckType::None:
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return 0;
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case XzStreamCheckType::CRC32:
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return 4;
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case XzStreamCheckType::CRC64:
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return 8;
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case XzStreamCheckType::SHA256:
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return 32;
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default:
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return {};
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}
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}
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ErrorOr<Bytes> XzDecompressor::read_some(Bytes bytes)
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{
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if (m_found_last_stream_footer)
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@ -260,23 +276,14 @@ ErrorOr<Bytes> XzDecompressor::read_some(Bytes bytes)
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// stored one, the decoder MUST indicate an error. If the selected
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// type of Check is not supported by the decoder, it SHOULD
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// indicate a warning or error."
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auto maybe_check_size = size_for_check_type(m_stream_flags->check_type);
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if (!maybe_check_size.has_value())
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return Error::from_string_literal("XZ stream has an unknown check type");
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// TODO: Block content checks are currently unimplemented as a whole, independent of the check type.
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// For now, we only make sure to remove the correct amount of bytes from the stream.
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switch (m_stream_flags->check_type) {
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case XzStreamCheckType::None:
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break;
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case XzStreamCheckType::CRC32:
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TRY(m_stream->discard(4));
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break;
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case XzStreamCheckType::CRC64:
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TRY(m_stream->discard(8));
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break;
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case XzStreamCheckType::SHA256:
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TRY(m_stream->discard(32));
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break;
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default:
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return Error::from_string_literal("XZ stream has an unknown check type");
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}
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TRY(m_stream->discard(*maybe_check_size));
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}
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auto start_of_current_block = m_stream->read_bytes();
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