mirror of https://git.tukaani.org/xz.git
206 lines
7.5 KiB
Plaintext
206 lines
7.5 KiB
Plaintext
|
|
.lzma Test Files
|
|
----------------
|
|
|
|
0. Introduction
|
|
|
|
This directory contains bunch of files to test handling of .lzma files
|
|
in .lzma decoder implementations. Many of the files have been created
|
|
by hand with a hex editor, thus there is no better "source code" than
|
|
the files themselves. All the test files (*.lzma) and this README have
|
|
been put into the public domain.
|
|
|
|
|
|
1. File Types
|
|
|
|
Good files (good-*.lzma) must decode successfully without requiring
|
|
a lot of CPU time or RAM.
|
|
|
|
Unsupported files (unsupported-*.lzma) are good files, but headers
|
|
indicate features not supported by the current file format
|
|
specification.
|
|
|
|
Bad files (bad-*.lzma) must cause the decoder to give an error. Like
|
|
with the good files, these files must not require a lot of CPU time
|
|
or RAM before they get detected to be broken.
|
|
|
|
|
|
2. Descriptions of Individual Files
|
|
|
|
2.1. Good Files
|
|
|
|
good-0-empty.lzma has one Stream with no Blocks.
|
|
|
|
good-0pad-empty.lzma has one Stream with no Blocks followed by
|
|
four-byte Stream Padding.
|
|
|
|
good-0cat-empty.lzma has two zero-Block Streams concatenated without
|
|
Stream Padding.
|
|
|
|
good-0catpad-empty.lzma has two zero-Block Streams concatenated with
|
|
four-byte Stream Padding between the Streams.
|
|
|
|
good-1-check-none.lzma has one Stream with one Block with two
|
|
uncompressed LZMA2 chunks and no integrity check.
|
|
|
|
good-1-check-crc32.lzma has one Stream with one Block with two
|
|
uncompressed LZMA2 chunks and CRC32 check.
|
|
|
|
good-1-check-crc64.lzma is like good-1-check-crc32.lzma but with CRC64.
|
|
|
|
good-1-check-sha256.lzma is like good-1-check-crc32.lzma but with
|
|
SHA256.
|
|
|
|
good-2-lzma2.lzma has one Stream with two Blocks with one uncompressed
|
|
LZMA2 chunk in each Block.
|
|
|
|
good-1-block_header-1.lzma has both Compressed Size and Uncompressed
|
|
Size in the Block Header. This has also four extra bytes of Header
|
|
Padding.
|
|
|
|
good-1-block_header-2.lzma has known Compressed Size.
|
|
|
|
good-1-block_header-3.lzma has known Uncompressed Size.
|
|
|
|
good-1-delta-lzma2.tiff.lzma is an image file that compresses
|
|
better with Delta+LZMA2 than with plain LZMA2.
|
|
|
|
good-1-x86-lzma2.lzma uses the x86 filter (BCJ) and LZMA2. The
|
|
uncompressed file is compress_prepared_bcj_x86 found from the tests
|
|
directory.
|
|
|
|
good-1-sparc-lzma2.lzma uses the SPARC filter and LZMA. The
|
|
uncompressed file is compress_prepared_bcj_sparc found from the tests
|
|
directory.
|
|
|
|
good-1-lzma2-1.lzma has two LZMA2 chunks, of which the second sets
|
|
new properties.
|
|
|
|
good-1-lzma2-2.lzma has two LZMA2 chunks, of which the second resets
|
|
the state without specifying new properties.
|
|
|
|
good-1-lzma2-3.lzma has two LZMA2 chunks, of which the first is
|
|
uncompressed and the second is LZMA. The first chunk resets dictionary
|
|
and the second sets new properties.
|
|
|
|
good-1-3delta-lzma2.lzma has three Delta filters and LZMA2.
|
|
|
|
|
|
2.2. Unsupported Files
|
|
|
|
unsupported-check.lzma uses Check ID 0x02 which isn't supported by
|
|
the current version of the file format. It is implementation-defined
|
|
how this file handled (it may reject it, or decode it possibly with
|
|
a warning).
|
|
|
|
unsupported-block_header.lzma has a non-nul byte in Header Padding,
|
|
which may indicate presence of a new unsupported field.
|
|
|
|
unsupported-filter_flags-1.lzma has unsupported Filter ID 0x7F.
|
|
|
|
unsupported-filter_flags-2.lzma specifies only Delta filter in the
|
|
List of Filter Flags, but Delta isn't allowed as the last filter in
|
|
the chain. It could be a little more correct to detect this file as
|
|
corrupt instead of unsupported, but saying it is unsupported is
|
|
simpler in case of liblzma.
|
|
|
|
unsupported-filter_flags-3.lzma specifies two LZMA2 filters in the
|
|
List of Filter Flags. LZMA2 is allowed only as the last filter in the
|
|
chain. It could be a little more correct to detect this file as
|
|
corrupt instead of unsupported, but saying it is unsupported is
|
|
simpler in case of liblzma.
|
|
|
|
|
|
2.3. Bad Files
|
|
|
|
bad-0pad-empty.lzma has one Stream with no Blocks followed by
|
|
five-byte Stream Padding. Stream Padding must be a multiple of four
|
|
bytes, thus this file is corrupt.
|
|
|
|
bad-0catpad-empty.lzma has two zero-Block Streams concatenated with
|
|
five-byte Stream Padding between the Streams.
|
|
|
|
bad-0cat-alone.lzma is good-0-empty.lzma concatenated with an empty
|
|
LZMA_Alone file.
|
|
|
|
bad-0-empty-truncated.lzma is good-0-empty.lzma without the last byte
|
|
of the file.
|
|
|
|
bad-0-nonempty_index.lzma has no Blocks but Index claims that there is
|
|
one Block.
|
|
|
|
bad-0-backward_size.lzma has wrong Backward Size in Stream Footer.
|
|
|
|
bad-1-stream_flags-1.lzma has different Stream Flags in Stream Header
|
|
and Stream Footer.
|
|
|
|
bad-1-stream_flags-2.lzma has wrong CRC32 in Stream Header.
|
|
|
|
bad-1-stream_flags-3.lzma has wrong CRC32 in Stream Footer.
|
|
|
|
bad-1-vli-1.lzma has two-byte variable-length integer in the
|
|
Uncompressed Size field in Block Header while one-byte would be enough
|
|
for that value. It's important that the file gets rejected due to too
|
|
big integer encoding instead of due to Uncompressed Size not matching
|
|
the value stored in the Block Header. That is, the decoder must not
|
|
try to decode the Compressed Data field.
|
|
|
|
bad-1-vli-2.lzma has ten-byte variable-length integer as Uncompressed
|
|
Size in Block Header. It's important that the file gets rejected due
|
|
to too big integer encoding instead of due to Uncompressed Size not
|
|
matching the value stored in the Block Header. That is, the decoder
|
|
must not try to decode the Compressed Data field.
|
|
|
|
bad-1-block_header-1.lzma has Block Header that ends in the middle of
|
|
the Filter Flags field.
|
|
|
|
bad-1-block_header-2.lzma has Block Header that has Compressed Size and
|
|
Uncompressed Size but no List of Filter Flags field.
|
|
|
|
bad-1-block_header-3.lzma has wrong CRC32 in Block Header.
|
|
|
|
bad-1-block_header-4.lzma has too big Compressed Size (2^63 bytes while
|
|
maximum is 2^63 - 4 bytes) in Block Header. It's important that the
|
|
file gets rejected due to invalid Compressed Size value; the decoder
|
|
must not try decoding the Compressed Data field.
|
|
|
|
bad-2-index-1.lzma has wrong Total Sizes in Index.
|
|
|
|
bad-2-index-2.lzma has wrong Uncompressed Sizes in Index.
|
|
|
|
bad-2-index-3.lzma has non-nul byte in Index Padding.
|
|
|
|
bad-2-index-4.lzma wrong CRC32 in Index.
|
|
|
|
bad-2-compressed_data_padding.lzma has non-nul byte in the padding of
|
|
the Compressed Data field of the first Block.
|
|
|
|
bad-1-check-crc32.lzma has wrong Check (CRC32).
|
|
|
|
bad-1-check-crc64.lzma has wrong Check (CRC64).
|
|
|
|
bad-1-check-sha256.lzma has wrong Check (SHA-256).
|
|
|
|
bad-1-lzma2-1.lzma has LZMA2 stream whose first chunk (uncompressed)
|
|
doesn't reset the dictionary.
|
|
|
|
bad-1-lzma2-2.lzma has two LZMA2 chunks, of which the second chunk
|
|
indicates dictionary reset, but the LZMA compressed data tries to
|
|
repeat data from the previous chunk.
|
|
|
|
bad-1-lzma2-3.lzma sets new invalid properties (lc=8, lp=0, pb=0) in
|
|
the middle of Block.
|
|
|
|
bad-1-lzma2-4.lzma has two LZMA2 chunks, of which the first is
|
|
uncompressed and the second is LZMA. The first chunk resets dictionary
|
|
as it should, but the second chunk tries to reset state without
|
|
specifying properties for LZMA.
|
|
|
|
bad-1-lzma2-5.lzma is like bad-1-lzma2-4.lzma but doesn't try to reset
|
|
anything in the header of the second chunk.
|
|
|
|
bad-1-lzma2-6.lzma has reserved LZMA2 control byte value (0x03).
|
|
|
|
bad-1-lzma2-7.lzma has EOPM at LZMA level.
|
|
|