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211 lines
7.7 KiB
Text
211 lines
7.7 KiB
Text
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.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 .lzma files
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in .lzma decoder implementations. Many of the files have been created
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by hand with a hex editor, thus there is no better "source code" than
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the files themselves. All the test files (*.lzma) and this README have
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been put into the public domain.
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1. File Types
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Good files (good-*.lzma) must decode successfully without requiring
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a lot of CPU time or RAM.
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Unsupported files (unsupported-*.lzma) 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-*.lzma) must cause the decoder to give an error. Like
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with the good files, these files must not require a lot of CPU time
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or RAM before they get detected to be broken.
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2. Descriptions of Individual Files
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2.1. Good Files
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good-0-empty.lzma has one Stream with no Blocks.
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good-0pad-empty.lzma has one Stream with no Blocks followed by
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four-byte Stream Padding.
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good-0cat-empty.lzma has two zero-Block Streams concatenated without
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Stream Padding.
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good-0catpad-empty.lzma 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.lzma 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.lzma 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.lzma is like good-1-check-crc32.lzma but with CRC64.
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good-1-check-sha256.lzma is like good-1-check-crc32.lzma but with
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SHA256.
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good-2-lzma2.lzma 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.lzma 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.lzma has known Compressed Size.
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good-1-block_header-3.lzma has known Uncompressed Size.
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good-1-delta-lzma2.tiff.lzma 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.lzma 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.lzma uses the SPARC filter and LZMA. 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.lzma has two LZMA2 chunks, of which the second sets
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new properties.
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good-1-lzma2-2.lzma 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.lzma 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-1-3delta-lzma2.lzma has three Delta filters and LZMA2.
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2.2. Unsupported Files
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unsupported-check.lzma 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.lzma has a non-nul 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.lzma has unsupported Filter ID 0x7F.
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unsupported-filter_flags-2.lzma 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.lzma 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.lzma 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.lzma 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.lzma is good-0-empty.lzma concatenated with an empty
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LZMA_Alone file.
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bad-0-empty-truncated.lzma is good-0-empty.lzma without the last byte
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of the file.
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bad-0-header_magic.lzma is good-0-empty.lzma but with one byte wrong
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in the Header Magic Bytes field.
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bad-0-footer_magic.lzma is good-0-empty.lzma but with one byte wrong
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in the Footer Magic Bytes field.
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bad-0-nonempty_index.lzma has no Blocks but Index claims that there is
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one Block.
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bad-0-backward_size.lzma has wrong Backward Size in Stream Footer.
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bad-1-stream_flags-1.lzma has different Stream Flags in Stream Header
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and Stream Footer.
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bad-1-stream_flags-2.lzma has wrong CRC32 in Stream Header.
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bad-1-stream_flags-3.lzma has wrong CRC32 in Stream Footer.
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bad-1-vli-1.lzma 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.lzma 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.lzma 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.lzma 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.lzma has wrong CRC32 in Block Header.
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bad-1-block_header-4.lzma has too big Compressed Size (2^63 bytes while
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maximum is 2^63 - 4 bytes) in Block Header. It's important that the
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file 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-2-index-1.lzma has wrong Total Sizes in Index.
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bad-2-index-2.lzma has wrong Uncompressed Sizes in Index.
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bad-2-index-3.lzma has non-nul byte in Index Padding.
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bad-2-index-4.lzma wrong CRC32 in Index.
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bad-2-compressed_data_padding.lzma has non-nul 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.lzma has wrong Check (CRC32).
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bad-1-check-crc64.lzma has wrong Check (CRC64).
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bad-1-check-sha256.lzma has wrong Check (SHA-256).
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bad-1-lzma2-1.lzma has LZMA2 stream whose first chunk (uncompressed)
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doesn't reset the dictionary.
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bad-1-lzma2-2.lzma 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.lzma 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.lzma 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.lzma is like bad-1-lzma2-4.lzma 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.lzma has reserved LZMA2 control byte value (0x03).
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bad-1-lzma2-7.lzma has EOPM at LZMA level.
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