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New -osirrox option sparse= controls extraction into sparse files

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Thomas Schmitt
2020-11-03 09:27:41 +01:00
parent 66fe150831
commit 05de7ec5ee
13 changed files with 464 additions and 82 deletions
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17
xorriso/xorriso.texi
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@ -50,7 +50,7 @@
@c man .\" First parameter, NAME, should be all caps
@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
@c man .\" other parameters are allowed: see man(7), man(1)
@c man .TH XORRISO 1 "Version 1.5.3, Oct 27, 2020"
@c man .TH XORRISO 1 "Version 1.5.3, Nov 02, 2020"
@c man .\" Please adjust this date whenever revising the manpage.
@c man .\"
@c man .\" Some roff macros, for reference:
@ -5739,6 +5739,21 @@ MD5 of the copied content gets computed and compared with the recorded MD5.
A mismatch causes an error message of severity SORRY.
Option @strong{check_md5_force} causes an error message if -md5 is "on"
but no MD5 is recorded for the data file.
@*
Option @strong{sparse=} controls production of sparse files during
extraction of files from the ISO filesystem.
Default is @strong{sparse=off}.
@*
A positive number like in @strong{sparse=1m} sets the minimum requirement
for the length of a sequence of 0-bytes which shall be represented by a gap.
This saves disk space if the disk filesystem supports sparse files.
A gap gets created by help of lseek(2) if a sequence of read buffers, which
contain only 0-bytes, bears at least the minimum amount of bytes. Expect
read buffers to be in the size range of 32k or 64k.
@*
Command -paste_in creates gaps only if the writing begins at or after the end
of the existing disk file. So the sequence of -paste_in commands matters.
Command -concat does not create sparse files.
@c man .TP
@item -extract iso_rr_path disk_path
@kindex -extract copies file tree to disk