316 lines
12 KiB
Plaintext
316 lines
12 KiB
Plaintext
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.xz and .lzma Test Files
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------------------------
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0. Introduction
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This directory contains bunch of files to test handling of .xz
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and .lzma files in decoder implementations. Many of the files have
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been created by hand with a hex editor, thus there is no better
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"source code" than the files themselves. All the test files and
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this README have been put into the public domain.
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1. File Types
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Good files (good-*.xz, good-*.lzma) must decode successfully
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without requiring a lot of CPU time or RAM.
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Unsupported files (unsupported-*.xz) are good files, but headers
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indicate features not supported by the current file format
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specification.
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Bad files (bad-*.xz, bad-*.lzma) must cause the decoder to give
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an error. Like with the good files, these files must not require
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a lot of CPU time or RAM before they get detected to be broken.
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2. Descriptions of Individual .xz Files
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2.1. Good Files
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good-0-empty.xz has one Stream with no Blocks.
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good-0pad-empty.xz has one Stream with no Blocks followed by
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four-byte Stream Padding.
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good-0cat-empty.xz has two zero-Block Streams concatenated without
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Stream Padding.
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good-0catpad-empty.xz has two zero-Block Streams concatenated with
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four-byte Stream Padding between the Streams.
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good-1-check-none.xz has one Stream with one Block with two
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uncompressed LZMA2 chunks and no integrity check.
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good-1-check-crc32.xz has one Stream with one Block with two
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uncompressed LZMA2 chunks and CRC32 check.
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good-1-check-crc64.xz is like good-1-check-crc32.xz but with CRC64.
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good-1-check-sha256.xz is like good-1-check-crc32.xz but with
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SHA256.
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good-2-lzma2.xz has one Stream with two Blocks with one uncompressed
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LZMA2 chunk in each Block.
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good-1-block_header-1.xz has both Compressed Size and Uncompressed
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Size in the Block Header. This has also four extra bytes of Header
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Padding.
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good-1-block_header-2.xz has known Compressed Size.
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good-1-block_header-3.xz has known Uncompressed Size.
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good-1-delta-lzma2.tiff.xz is an image file that compresses
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better with Delta+LZMA2 than with plain LZMA2.
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good-1-x86-lzma2.xz uses the x86 filter (BCJ) and LZMA2. The
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uncompressed file is compress_prepared_bcj_x86 found from the tests
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directory.
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good-1-sparc-lzma2.xz uses the SPARC filter and LZMA2. The
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uncompressed file is compress_prepared_bcj_sparc found from the tests
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directory.
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good-1-lzma2-1.xz has two LZMA2 chunks, of which the second sets
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new properties.
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good-1-lzma2-2.xz has two LZMA2 chunks, of which the second resets
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the state without specifying new properties.
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good-1-lzma2-3.xz has two LZMA2 chunks, of which the first is
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uncompressed and the second is LZMA. The first chunk resets dictionary
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and the second sets new properties.
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good-1-lzma2-4.xz has three LZMA2 chunks: First is LZMA, second is
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uncompressed with dictionary reset, and third is LZMA with new
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properties but without dictionary reset.
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good-1-lzma2-5.xz has an empty LZMA2 stream with only the end of
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payload marker. XZ Utils 5.0.1 and older incorrectly see this file
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as corrupt.
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good-1-3delta-lzma2.xz has three Delta filters and LZMA2.
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good-1-empty-bcj-lzma2.xz has an empty Block that uses PowerPC BCJ
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and LZMA2. liblzma from XZ Utils 5.0.1 and older may incorrectly
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return LZMA_BUF_ERROR in some cases. See commit message
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d8db706acb8316f9861abd432cfbe001dd6d0c5c for the details.
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2.2. Unsupported Files
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unsupported-check.xz uses Check ID 0x02 which isn't supported by
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the current version of the file format. It is implementation-defined
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how this file handled (it may reject it, or decode it possibly with
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a warning).
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unsupported-block_header.xz has a non-null byte in Header Padding,
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which may indicate presence of a new unsupported field.
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unsupported-filter_flags-1.xz has unsupported Filter ID 0x7F.
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unsupported-filter_flags-2.xz specifies only Delta filter in the
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List of Filter Flags, but Delta isn't allowed as the last filter in
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the chain. It could be a little more correct to detect this file as
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corrupt instead of unsupported, but saying it is unsupported is
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simpler in case of liblzma.
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unsupported-filter_flags-3.xz specifies two LZMA2 filters in the
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List of Filter Flags. LZMA2 is allowed only as the last filter in the
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chain. It could be a little more correct to detect this file as
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corrupt instead of unsupported, but saying it is unsupported is
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simpler in case of liblzma.
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2.3. Bad Files
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bad-0pad-empty.xz has one Stream with no Blocks followed by
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five-byte Stream Padding. Stream Padding must be a multiple of four
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bytes, thus this file is corrupt.
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bad-0catpad-empty.xz has two zero-Block Streams concatenated with
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five-byte Stream Padding between the Streams.
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bad-0cat-alone.xz is good-0-empty.xz concatenated with an empty
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LZMA_Alone file.
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bad-0cat-header_magic.xz is good-0cat-empty.xz but with one byte
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wrong in the Header Magic Bytes field of the second Stream. liblzma
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gives LZMA_DATA_ERROR for this. (LZMA_FORMAT_ERROR is used only if
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the first Stream of a file has invalid Header Magic Bytes.)
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bad-0-header_magic.xz is good-0-empty.xz but with one byte wrong
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in the Header Magic Bytes field. liblzma gives LZMA_FORMAT_ERROR for
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this.
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bad-0-footer_magic.xz is good-0-empty.xz but with one byte wrong
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in the Footer Magic Bytes field. liblzma gives LZMA_DATA_ERROR for
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this.
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bad-0-empty-truncated.xz is good-0-empty.xz without the last byte
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of the file.
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bad-0-nonempty_index.xz has no Blocks but Index claims that there is
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one Block.
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bad-0-backward_size.xz has wrong Backward Size in Stream Footer.
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bad-1-stream_flags-1.xz has different Stream Flags in Stream Header
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and Stream Footer.
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bad-1-stream_flags-2.xz has wrong CRC32 in Stream Header.
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bad-1-stream_flags-3.xz has wrong CRC32 in Stream Footer.
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bad-1-vli-1.xz has two-byte variable-length integer in the
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Uncompressed Size field in Block Header while one-byte would be enough
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for that value. It's important that the file gets rejected due to too
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big integer encoding instead of due to Uncompressed Size not matching
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the value stored in the Block Header. That is, the decoder must not
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try to decode the Compressed Data field.
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bad-1-vli-2.xz has ten-byte variable-length integer as Uncompressed
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Size in Block Header. It's important that the file gets rejected due
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to too big integer encoding instead of due to Uncompressed Size not
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matching the value stored in the Block Header. That is, the decoder
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must not try to decode the Compressed Data field.
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bad-1-block_header-1.xz has Block Header that ends in the middle of
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the Filter Flags field.
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bad-1-block_header-2.xz has Block Header that has Compressed Size and
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Uncompressed Size but no List of Filter Flags field.
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bad-1-block_header-3.xz has wrong CRC32 in Block Header.
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bad-1-block_header-4.xz has too big Compressed Size in Block Header
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(2^63 - 1 bytes while maximum is a little less, because the whole
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Block must stay smaller than 2^63). It's important that the file
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gets rejected due to invalid Compressed Size value; the decoder
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must not try decoding the Compressed Data field.
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bad-1-block_header-5.xz has zero as Compressed Size in Block Header.
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bad-1-block_header-6.xz has corrupt Block Header which may crash
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xz -lvv in XZ Utils 5.0.3 and earlier. It was fixed in the commit
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c0297445064951807803457dca1611b3c47e7f0f.
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bad-2-index-1.xz has wrong Unpadded Sizes in Index.
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bad-2-index-2.xz has wrong Uncompressed Sizes in Index.
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bad-2-index-3.xz has non-null byte in Index Padding.
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bad-2-index-4.xz wrong CRC32 in Index.
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bad-2-index-5.xz has zero as Unpadded Size. It is important that the
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file gets rejected specifically due to Unpadded Size having an invalid
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value.
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bad-3-index-uncomp-overflow.xz has Index whose Uncompressed Size
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fields have huge values whose sum exceeds the maximum allowed size
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of 2^63 - 1 bytes. In this file the sum is exactly 2^64.
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lzma_index_append() in liblzma <= 5.2.6 lacks the integer overflow
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check for the uncompressed size and thus doesn't catch the error
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when decoding the Index field in this file. This makes "xz -l"
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not detect the error and will display 0 as the uncompressed size.
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Note that regular decompression isn't affected by this bug because
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it uses lzma_index_hash_append() instead.
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bad-2-compressed_data_padding.xz has non-null byte in the padding of
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the Compressed Data field of the first Block.
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bad-1-check-crc32.xz has wrong Check (CRC32).
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bad-1-check-crc32-2.xz has Compressed Size and Uncompressed Size in
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Block Header but wrong Check (CRC32) in the actual data. This file
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differs by one byte from good-1-block_header-1.xz: the last byte of
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the Check field is wrong. This file is useful for testing error
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detection in the threaded decoder when a worker thread is configured
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to pass input one byte at a time to the Block decoder.
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bad-1-check-crc64.xz has wrong Check (CRC64).
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bad-1-check-sha256.xz has wrong Check (SHA-256).
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bad-1-lzma2-1.xz has LZMA2 stream whose first chunk (uncompressed)
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doesn't reset the dictionary.
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bad-1-lzma2-2.xz has two LZMA2 chunks, of which the second chunk
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indicates dictionary reset, but the LZMA compressed data tries to
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repeat data from the previous chunk.
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bad-1-lzma2-3.xz sets new invalid properties (lc=8, lp=0, pb=0) in
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the middle of Block.
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bad-1-lzma2-4.xz has two LZMA2 chunks, of which the first is
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uncompressed and the second is LZMA. The first chunk resets dictionary
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as it should, but the second chunk tries to reset state without
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specifying properties for LZMA.
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bad-1-lzma2-5.xz is like bad-1-lzma2-4.xz but doesn't try to reset
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anything in the header of the second chunk.
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bad-1-lzma2-6.xz has reserved LZMA2 control byte value (0x03).
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bad-1-lzma2-7.xz has EOPM at LZMA level.
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bad-1-lzma2-8.xz is like good-1-lzma2-4.xz but doesn't set new
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properties in the third LZMA2 chunk.
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bad-1-lzma2-9.xz has LZMA2 stream that is truncated at the end of
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a LZMA2 chunk (no end marker). The uncompressed size of the partial
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LZMA2 stream exceeds the value stored in the Block Header.
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bad-1-lzma2-10.xz has LZMA2 stream that, from point of view of a
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LZMA2 decoder, extends past the end of Block (and even the end of
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the file). Uncompressed Size in Block Header is bigger than the
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invalid LZMA2 stream may produce (even if a decoder reads until
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the end of the file). The Check type is None to nullify certain
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simple size-based sanity checks in a Block decoder.
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bad-1-lzma2-11.xz has LZMA2 stream that lacks the end of
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payload marker. When Compressed Size bytes have been decoded,
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Uncompressed Size bytes of output will have been produced but
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the LZMA2 decoder doesn't indicate end of stream.
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3. Descriptions of Individual .lzma Files
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3.1. Good Files
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good-unknown_size-with_eopm.lzma has unknown size in the header
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and end of payload marker at the end.
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good-known_size-without_eopm.lzma has a known size in the header
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and no end of payload marker at the end.
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good-known_size-with_eopm.lzma has a known size in the header
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and end of payload marker at the end. XZ Utils 5.2.5 and older
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will give an error at the end of the file after producing the
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correct uncompressed output.
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3.2. Bad Files
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bad-unknown_size-without_eopm.lzma has unknown size in the header
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but no end of payload marker at the end. This file might be seen
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by a decoder as if it were truncated.
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bad-too_big_size-with_eopm.lzma has too big uncompressed size in
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the header and the end of payload marker will be detected before
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the specified number of bytes have been decoded.
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bad-too_small_size-without_eopm-1.lzma has too small uncompressed
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size in the header. The decoder will look for end of payload marker
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but instead find a literal that would produce more output.
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bad-too_small_size-without_eopm-2.lzma is like -1 above but instead
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of a literal the problem occurs with a short repeated match.
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bad-too_small_size-without_eopm-3.lzma is like -1 above but instead
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of a literal the problem occurs in the middle of a match.
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