This repo is a copy of the latest publicly available version of qpress, with several patches, including MacOS compatibility.
Please see the CircleCI build matrix for a list of tested build environments.
Pull requests are welcome.
qpress 1.1 - Copyright 2006-2010 Lasse Reinhold - www.quicklz.com
Using QuickLZ 1.4.1 compression library
Compiled for: Windows [*nix] [x86/x64] RISC 32-bit [64-bit]
Compression:
qpress [-rovfCBPLKT] <source file/dir search pattern> <destination file>
qpress -i[ovfBPLKT] <filename to give stdin data> <destination file>
Decompression:
qpress -d[ovfBPTn] <source file> <destination directory>
Benchmark and recovery:
qpress -m[LT] <source file>
qpress -R <corrupted compressed file> <destination directory>
Flags:
-d Decompress
-Ln Set compression level to n where n = 1, 2 or 3 (default = 1)
-r Include sub directories during compression
-v Show progress information during compression and decompression
-i Read from stdin (omit source file or file/dir search pattern)
-o Write to stdout (omit destination file or directory)
-f Overwrite existing files during compression and decompression (default
is to abort)
-C Continue if a source file cannot be opened during compression (default
is to abort)
-Tn Use n threads/cores where n = 1 to 256 (default = 2). Be aware of
memory usage with large n
-Kn Read from disk in n KiB chunks during compression where n = 64 to
32768 (default = 64). Be aware of memory usage with large n
-B Windows only: Disable file system caching (FILE_FLAG_NO_BUFFERING) to
prevent cache of other applications from being be flushed. Keep
enabled if files are small and need further processing
-Pn Windows only: Set CPU and disk I/O priority to n where 1 = BACKGORUND
(Vista, 7, 2008 only), 2 = IDLE, 3 = NORMAL or 4 = ABOVE (default = 3)
Examples of compression:
qpress -v file1.xml file2.xml file3.xml database.qp
qpress -vfK4096T2 *.xml database.qp 2> log.txt
qpress -ovL3K *.xml > database.qp
cat database.xml | qpress -i database.xml database.qp
cat database.xml | qpress -io database.xml > database.qp
Examples of decompression:
qpress -d database.qp ./dir
qpress -do database.qp > database.xml
cat database.qp | qpress -di .
Notes:
When compressing on *nix with -r flag, file/dir search pattern only filters in
top level directory (directories matching in top level will be included fully).
If a compressed file contains multiple files and is decompressed to stdout, all
files will be concatenated in a continuous stream.
It's recommended to use .qp as filename suffix.
Copyright Lasse Reinhold 2006-2010.
GPL 1, 2 and 3 licensed.