tuam
l33t
Joined: 04 May 2004
Posts: 765
Location: CGN, Germany
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 Posted: Sun Apr 27, 2008 2:44 pm Post subject: data compression with PAQ |
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Hi all,
PAQ is a compression program "that achieves very high compression rates at the expense of speed and memory."
http://cs.fit.edu/~mmahoney/compression/
It is really slow - my Core 2 Duo takes ~24 hours for compressing just 1GB (single-threaded), decompressing takes the same time
But it wins compression competitions (e.g. http://www.maximumcompression.com/data/summary_mf.php )
Usage
"paq8o9 file" for compressing (or add -7 to allow 1 GB of memory)
"paq8o9 -d file.paq8o9" for decompressing
You can download a tarball with the ebuild from http://www.daniel-peters.info/files/paq.tar.bz2
FF,
Daniel
| Code: | # cat paq-8o_p9.ebuild
# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $
inherit toolchain-funcs eutils
MY_PV="paq8o9"
DESCRIPTION="PAQ is a series of archivers that achieve very high compression rates at the expense of speed and memory."
HOMEPAGE="http://cs.fit.edu/~mmahoney/compression/"
SRC_URI="http://cs.fit.edu/~mmahoney/compression/${MY_PV}.zip"
RESTRICT="mirror"
LICENSE="GPL-2"
SLOT="8o9"
KEYWORDS="~arm ~x86 ~amd64"
IUSE="sse"
DEPEND="app-arch/unzip
x86? ( dev-lang/yasm )
amd64? ( dev-lang/yasm )"
RDEPEND=""
src_unpack() {
unpack ${A}
cd ${WORKDIR}
epatch "${FILESDIR}/${MY_PV}-nopause.patch"
epatch "${FILESDIR}/${MY_PV}-fix-stack.patch"
}
src_compile() {
if use x86 ; then
objectfile="paq7asm.o"
use sse && sse="sse"
yasm -f elf32 -o $objectfile paq7asm${sse}.asm || die "asm failed"
elif use amd64 ; then
objectfile="paq7asm.o"
yasm -f elf64 -o $objectfile paq7asm-x86_64.asm || die "asm failed"
else
CXXFLAGS="-DNOASM ${CXXFLAGS}"
fi
$(tc-getCXX) ${MY_PV}.cpp -DUNIX $CXXFLAGS $objectfile -o ${MY_PV} || die "compile failed"
}
src_install() {
dobin ${MY_PV}
}
pkg_postinst() {
if has_version "<${CATEGORY}/${P}" ; then
ewarn "Please note that archives created with older versions of PAQ"
ewarn "require that exact version to be extracted."
ewarn "I repeat: Do not remove older versions if you have created"
ewarn "archives with them."
fi
}
# cat files/paq8o9-nopause.patch
--- paq8o9.cpp.orig 2008-04-27 15:32:49.000000000 +0200
+++ paq8o9.cpp 2008-04-27 15:42:10.000000000 +0200
@@ -4250,6 +4250,7 @@
catch(const char* s) {
if (s) printf("%s\n", s);
}
+ pause=false;
if (pause) {
printf("\nClose this window or press ENTER to continue...\n");
getchar();
# cat files/paq8o9-fix-stack.patch
diff -urN work.orig/paq7asm.asm work/paq7asm.asm
--- work.orig/paq7asm.asm 2008-04-27 15:55:04.000000000 +0200
+++ work/paq7asm.asm 2008-04-27 15:54:27.000000000 +0200
@@ -136,4 +136,6 @@
ja .loop
.done:
emms
- ret
\ No newline at end of file
+ ret
+
+section .note.GNU-stack noalloc noexec nowrite progbits
diff -urN work.orig/paq7asmsse.asm work/paq7asmsse.asm
--- work.orig/paq7asmsse.asm 2008-04-27 15:55:04.000000000 +0200
+++ work/paq7asmsse.asm 2008-04-27 15:54:23.000000000 +0200
@@ -88,4 +88,6 @@
ret
align 16
-_mask dd 10001h,10001h,10001h,10001h ; 8 copies of 1 in xmm1
\ No newline at end of file
+_mask dd 10001h,10001h,10001h,10001h ; 8 copies of 1 in xmm1
+
+section .note.GNU-stack noalloc noexec nowrite progbits
diff -urN work.orig/paq7asm-x86_64.asm work/paq7asm-x86_64.asm
--- work.orig/paq7asm-x86_64.asm 2008-04-27 15:55:04.000000000 +0200
+++ work/paq7asm-x86_64.asm 2008-04-27 15:54:47.000000000 +0200
@@ -98,4 +98,6 @@
sub rcx, 8
ja .loop
.done:
- ret
\ No newline at end of file
+ ret
+
+section .note.GNU-stack noalloc noexec nowrite progbits
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_________________
Logic clearly dictates that the needs of the many outweigh the needs of the few. - Spock
The needs of the one outweigh the needs of the many. - Kirk
I refuse to let arithmetic decide questions like that. - Picard |
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