xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

mkpaqfs(8): allow setting compression level

Browse source
This commit is contained in:
cinap_lenrek 2021-05-23 17:06:14 +02:00
parent 33682347b9
commit d168b89ab1
2 changed files with 15 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
sys/man/8/mkpaqfs
View file

@ -6,6 +6,8 @@ mkpaqfs \- make a compressed read-only file system
[ [
.B -u .B -u
] [ ] [
.B -1-9
] [
.B -b .B -b
.I blocksize .I blocksize
] [ ] [
@ -42,6 +44,12 @@ option is set, the blocks are not compressed.
Otherwise each block is compressed using the Otherwise each block is compressed using the
.IR flate (2) .IR flate (2)
compression algorithm. compression algorithm.
The compression level can be set using the flags
.B -1
to
.B -9
(defaults to
.BR -6 ).
The The
.B -l .B -l
option embeds a label of up to 32 bytes within the file header and may be option embeds a label of up to 32 bytes within the file header and may be

9
sys/src/cmd/paqfs/mkpaqfs.c
View file

@ -33,6 +33,7 @@ void warn(char *fmt, ...);
int uflag=0; /* uncompressed */ int uflag=0; /* uncompressed */
long blocksize = 4*1024; long blocksize = 4*1024;
int level = 6;
Biobuf *out; Biobuf *out;
DigestState *outdg; DigestState *outdg;
@ -57,6 +58,10 @@ main(int argc, char *argv[])
if(label == nil) if(label == nil)
usage(); usage();
break; break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = ARGC() - '0';
break;
case 'b': case 'b':
s = ARGF(); s = ARGF();
if(s) { if(s) {
@ -105,7 +110,7 @@ main(int argc, char *argv[])
void void
usage(void) usage(void)
{ {
fprint(2, "usage: %s [-u] [-b blocksize] -o output [root]\n", argv0); fprint(2, "usage: %s [-u] [-1-9] [-b blocksize] -o output [root]\n", argv0);
exits("usage"); exits("usage");
} }
@ -370,7 +375,7 @@ writeBlock(uchar *b, int type)
if(!uflag) { if(!uflag) {
cb = emallocz(blocksize); cb = emallocz(blocksize);
n = deflateblock(cb, blocksize, b, blocksize, 6, 0); n = deflateblock(cb, blocksize, b, blocksize, level, 0);
if(n > 0 && n < blocksize) { if(n > 0 && n < blocksize) {
bh.encoding = DeflateEnc; bh.encoding = DeflateEnc;
bh.size = n; bh.size = n;