New -zisofs option by_magic=on

libisoburn/trunk/xorriso/xorriso.1

@@ -2,7 +2,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISO 1 "Apr 11, 2009"
+.TH XORRISO 1 "Apr 13, 2009"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -1808,7 +1808,11 @@ Parameters are:
 .br
  "block_size="32k|64k|128k size of compression blocks
 .br
- "default" same as "level=6:block_size=32k"
+ "by_magic=on" enables an expensive test at image generation time which checks
+files from disk whether they already are zisofs compressed, e.g. by program
+mkzftree.
+.br
+ "default" same as "level=6:block_size=32k:by_magic=off"
 .TP
 \fB\-speed\fR number[k|m|c|d|b]
 Set the burn speed. Default is 0 = maximum speed.
@@ -2692,7 +2696,7 @@ Personality "\fBmkisofs\fR" accepts the options listed with:
   -as mkisofs -help --
 .br
 Among them: -R (always on), -J, -o, -M, -C, -path-list, -m, -exclude-list,
--f, -print-size, -pad, -no-pad, -V, -v, -version, -graft-points,
+-f, -print-size, -pad, -no-pad, -V, -v, -version, -graft-points, -z,
 -no-emul-boot, -b, -c, -boot-info-table, -boot-load-size, -input-charset,
 -output-charset, pathspecs as with xorriso -add.
 A lot of options are not supported and lead to failure of the mkisofs