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mkpaqfs(8): allow setting compression level

--- a/sys/man/8/mkpaqfs

+++ b/sys/man/8/mkpaqfs

@@ -6,6 +6,8 @@

 [

 .B -u

 ] [

+.B -1-9

+] [

 .B -b

 .I blocksize

 ] [

@@ -42,6 +44,12 @@

 Otherwise each block is compressed using the

 .IR flate (2)

 compression algorithm.

+The compression level can be set using the flags

+.B -1

+to

+.B -9

+(defaults to 

+.BR -6 ).

 The

 .B -l

 option embeds a label of up to 32 bytes within the file header and may be

--- a/sys/src/cmd/paqfs/mkpaqfs.c

+++ b/sys/src/cmd/paqfs/mkpaqfs.c

@@ -33,6 +33,7 @@

 int uflag=0;			/* uncompressed */

 long blocksize = 4*1024;

+int level = 6;

 Biobuf *out;

 DigestState *outdg;

@@ -57,6 +58,10 @@

 		if(label == nil)

 			usage();

 		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':

 		s = ARGF();

 		if(s) {

@@ -105,7 +110,7 @@

 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");

 }

@@ -370,7 +375,7 @@

 	if(!uflag) {

 		cb = emallocz(blocksize);

-		n = deflateblock(cb, blocksize, b, blocksize, 6, 0);

+		n = deflateblock(cb, blocksize, b, blocksize, level, 0);

 		if(n > 0 && n < blocksize) {

 			bh.encoding = DeflateEnc;

 			bh.size = n;