Use a lower max_search_depth but a higher nice_match_length. This seems
to turn out a bit better, on average. This is consistent with what the
other compression levels do; level 4 was the only one that had
nice_match_length <= max_search_depth.
The new match scoring method in the lazy compressor has improved the
compression ratio slightly. Therefore, for levels 5-6 decrease
max_search_depth slightly to get a bit more performance.
We pull the version out of libdeflate.h into the
Makefile, and then sed a few macros out of the new
file libdeflate.pc.in. Set the necessary Cflags
and Libs (CFLAGS and LFLAGS) based off compile-time
definitions. Depend on the Makefile to pick up
version changes. Update uninstall target.
Signed-off-by: nick black <dankamongmen@gmail.com>
Environment variable DISABLE_SHARED (following convention of --disable-shared
of ./configure script) disables building of shared library and shared lib
symlink. It makes life of downstream maintainer easier when maintaining package
for environment that supports only static libraries.
See https://github.com/NixOS/nixpkgs/pull/144438
The '-t' option of GNU gzip allows checking whether a gzip file is valid
without writing the data anywhere. It's relatively straightforward to
support in libdeflate-gzip too, so add support for it.
Resolves https://github.com/ebiggers/libdeflate/issues/125
[EB - updated commit message]
A lot of the internal library headers don't have include guards because
they aren't needed. It might look like a bug, though, and it doesn't
hurt to add them. So do this.
Update https://github.com/ebiggers/libdeflate/issues/117
I saw this tweet claiming this flag makes libdeflate run 20% faster on
WebAssembly: https://twitter.com/Algunenano/status/1317098341377900550.
Indeed, when tried even in a complex PNG compression benchmark I've
observed 10-15% improvement when this flag is enabled.
Even though WebAssembly might be running on top of a variety of
underlying platforms, the spec requires it to support unaligned access,
and on majority of platforms it will translate to a faster code.
Hence, I think it makes sense to enable this flag by default.
Include sys/types.h to avoid the following build failure on uclibc:
In file included from programs/gzip.c:28:0:
programs/prog_util.h:159:1: error: unknown type name ‘ssize_t’
ssize_t xread(struct file_stream *strm, void *buf, size_t count);
^
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Remove the ability of matchfinder_init() and matchfinder_rebase() to
fail due to the matchfinder memory size being misaligned. Instead,
require that the size always be 128-byte aligned -- which is already the
case. Also, make the matchfinder memory always be 32-byte aligned --
which doesn't really have any downside.
The Makefile didn't trigger a rebuild if some settings changed, e.g.
LDFLAGS or DECOMPRESSION_ONLY. Fix this.
Also simplify the rebuild logic by not handling the library and programs
separately, as this optimization doesn't seem to be worthwhile.
Avoid confusion with the GNU extension 'program_invocation_name', which
is described by 'man 3 program_invocation_name'. The GNU version isn't
supposed to be exposed without defining _GNU_SOURCE, which we don't in
any of the relevant files, but it's best to avoid any confusion.
The cutoff for outputting uncompressed data is currently < 16 bytes for
all compression levels. That isn't ideal, since the higher the
compression level, the more we should bother with very small inputs; and
the lower the compression level, the less we should bother.
Use a formula that produces the following cutoffs:
Level Cutoff
----- ------
0 56
1 52
2 48
3 44
4 40
5 36
6 32
7 28
8 24
9 20
10 16
11 12
12 8
Update https://github.com/ebiggers/libdeflate/issues/67
