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retro-imager/dependencies/libarchive-3.5.2/doc/text/archive_write_set_options.3.txt
Floris Bos 67618a2eac Bump bundled libarchive version to 3.5.2 
- Update bunlded libarchive version used on Windows/Mac
- Enable requested zstd support while we are at it. Closes #211
2021-12-09 12:22:14 +01:00

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ARCHIVE_WRITE_OPTIONS(3) BSD Library Functions Manual ARCHIVE_WRITE_OPTIONS(3)
NAME
archive_write_set_filter_option, archive_write_set_format_option,
archive_write_set_option, archive_write_set_options — functions control‐
ling options for writing archives
LIBRARY
Streaming Archive Library (libarchive, -larchive)
SYNOPSIS
int
archive_write_set_filter_option(struct archive *, const char *module,
const char *option, const char *value);
int
archive_write_set_format_option(struct archive *, const char *module,
const char *option, const char *value);
int
archive_write_set_option(struct archive *, const char *module,
const char *option, const char *value);
int
archive_write_set_options(struct archive *, const char *options);
DESCRIPTION
These functions provide a way for libarchive clients to configure spe‐
cific write modules.
archive_write_set_filter_option(), archive_write_set_format_option()
Specifies an option that will be passed to the currently-regis‐
tered filters (including decompression filters) or format read‐
ers.
If option and value are both NULL, these functions will do noth‐
ing and ARCHIVE_OK will be returned. If option is NULL but value
is not, these functions will do nothing and ARCHIVE_FAILED will
be returned.
If module is not NULL, option and value will be provided to the
filter or reader named module. The return value will be either
ARCHIVE_OK if the option was successfully handled or ARCHIVE_WARN
if the option was unrecognized by the module or could otherwise
not be handled. If there is no such module, ARCHIVE_FAILED will
be returned.
If module is NULL, option and value will be provided to every
registered module. If any module returns ARCHIVE_FATAL, this
value will be returned immediately. Otherwise, ARCHIVE_OK will
be returned if any module accepts the option, and ARCHIVE_FAILED
in all other cases.
archive_write_set_option()
Calls archive_write_set_format_option(), then
archive_write_set_filter_option(). If either function returns
ARCHIVE_FATAL, ARCHIVE_FATAL will be returned immediately. Oth‐
erwise, the greater of the two values will be returned.
archive_write_set_options()
options is a comma-separated list of options. If options is NULL
or empty, ARCHIVE_OK will be returned immediately.
Individual options have one of the following forms:
option=value
The option/value pair will be provided to every module.
Modules that do not accept an option with this name will
ignore it.
option The option will be provided to every module with a value
of “1”.
!option
The option will be provided to every module with a NULL
value.
module:option=value, module:option, module:!option
As above, but the corresponding option and value will be
provided only to modules whose name matches module.
OPTIONS
Filter b64encode
mode The value is interpreted as octal digits specifying the
file mode.
name The value specifies the file name.
Filter bzip2
compression-level
The value is interpreted as a decimal integer specifying
the bzip2 compression level. Supported values are from 1
to 9.
Filter gzip
compression-level
The value is interpreted as a decimal integer specifying
the gzip compression level. Supported values are from 0
to 9.
timestamp
Store timestamp. This is enabled by default.
Filter lrzip
compression=type
Use type as compression method. Supported values are
“bzip2”, “gzipi”, “lzo” (ultra fast), and “zpaq” (best,
extremely slow).
compression-level
The value is interpreted as a decimal integer specifying
the lrzip compression level. Supported values are from 1
to 9.
Filter lz4
compression-level
The value is interpreted as a decimal integer specifying
the lz4 compression level. Supported values are from 0 to
9.
stream-checksum
Enable stream checksum. This is enabled by default.
block-checksum
Enable block checksum. This is disabled by default.
block-size
The value is interpreted as a decimal integer specifying
the lz4 compression block size. Supported values are from
4 to 7 (default).
block-dependence
Use the previous block of the block being compressed for
a compression dictionary to improve compression ratio.
This is disabled by default.
Filter lzop
compression-level
The value is interpreted as a decimal integer specifying
the lzop compression level. Supported values are from 1
to 9.
Filter uuencode
mode The value is interpreted as octal digits specifying the
file mode.
name The value specifies the file name.
Filter xz
compression-level
The value is interpreted as a decimal integer specifying
the compression level. Supported values are from 0 to 9.
threads
The value is interpreted as a decimal integer specifying
the number of threads for multi-threaded lzma compres‐
sion. If supported, the default value is read from
lzma_cputhreads().
Filter zstd
compression-level
The value is interpreted as a decimal integer specifying
the compression level. Supported values depend on the li‐
brary version, common values are from 1 to 22.
Format 7zip
compression
The value is one of “store”, “deflate”, “bzip2”, “lzma1”,
“lzma2” or “ppmd” to indicate how the following entries
should be compressed. Note that this setting is ignored
for directories, symbolic links, and other special en‐
tries.
compression-level
The value is interpreted as a decimal integer specifying
the compression level. Values between 0 and 9 are sup‐
ported. The interpretation of the compression level de‐
pends on the chosen compression method.
Format bin
hdrcharset
The value is used as a character set name that will be
used when translating file names.
Format gnutar
hdrcharset
The value is used as a character set name that will be
used when translating file, group and user names.
Format iso9660 - volume metadata
These options are used to set standard ISO9660 metadata.
abstract-file=filename
The file with the specified name will be identified in
the ISO9660 metadata as holding the abstract for this
volume. Default: none.
application-id=filename
The file with the specified name will be identified in
the ISO9660 metadata as holding the application identi‐
fier for this volume. Default: none.
biblio-file=filename
The file with the specified name will be identified in
the ISO9660 metadata as holding the bibliography for this
volume. Default: none.
copyright-file=filename
The file with the specified name will be identified in
the ISO9660 metadata as holding the copyright for this
volume. Default: none.
publisher=filename
The file with the specified name will be identified in
the ISO9660 metadata as holding the publisher information
for this volume. Default: none.
volume-id=string
The specified string will be used as the Volume Identi‐
fier in the ISO9660 metadata. It is limited to 32 bytes.
Default: none.
Format iso9660 - boot support
These options are used to make an ISO9660 image that can be di‐
rectly booted on various systems.
boot=filename
The file matching this name will be used as the El Torito
boot image file.
boot-catalog=name
The name that will be used for the El Torito boot cata‐
log. Default: boot.catalog
boot-info-table
The boot image file provided by the boot=filename option
will be edited with appropriate boot information in bytes
8 through 64. Default: disabled
boot-load-seg=hexadecimal-number
The load segment for a no-emulation boot image.
boot-load-size=decimal-number
The number of "virtual" 512-byte sectors to be loaded
from a no-emulation boot image. Some very old BIOSes can
only load very small images, setting this value to 4 will
often allow such BIOSes to load the first part of the
boot image (which will then need to be intelligent enough
to load the rest of itself). This should not be needed
unless you are trying to support systems with very old
BIOSes. This defaults to the full size of the image.
boot-type=value
Specifies the boot semantics used by the El Torito boot
image: If the value is fd, then the boot image is assumed
to be a bootable floppy image. If the value is hd, then
the boot image is assumed to be a bootable hard disk im‐
age. If the value is no-emulation, the boot image is
used without floppy or hard disk emulation. If the boot
image is exactly 1.2MB, 1.44MB, or 2.88MB, then the de‐
fault is fd, otherwise the default is no-emulation.
Format iso9660 - filename and size extensions
Various extensions to the base ISO9660 format.
allow-ldots
If enabled, allows filenames to begin with a leading pe‐
riod. If disabled, filenames that begin with a leading
period will have that period replaced by an underscore
character in the standard ISO9660 namespace. This does
not impact names stored in the Rockridge or Joliet exten‐
sion area. Default: disabled.
allow-lowercase
If enabled, allows filenames to contain lowercase charac‐
ters. If disabled, filenames will be forced to upper‐
case. This does not impact names stored in the Rockridge
or Joliet extension area. Default: disabled.
allow-multidot
If enabled, allows filenames to contain multiple period
characters, in violation of the ISO9660 specification.
If disabled, additional periods will be converted to un‐
derscore characters. This does not impact names stored
in the Rockridge or Joliet extension area. Default: dis‐
abled.
allow-period
If enabled, allows filenames to contain trailing period
characters, in violation of the ISO9660 specification.
If disabled, trailing periods will be converted to under‐
score characters. This does not impact names stored in
the Rockridge or Joliet extension area. Default: dis‐
abled.
allow-pvd-lowercase
If enabled, the Primary Volume Descriptor may contain
lowercase ASCII characters, in violation of the ISO9660
specification. If disabled, characters will be converted
to uppercase ASCII. Default: disabled.
allow-sharp-tilde
If enabled, sharp and tilde characters will be permitted
in filenames, in violation if the ISO9660 specification.
If disabled, such characters will be converted to under‐
score characters. Default: disabled.
allow-vernum
If enabled, version numbers will be included with files.
If disabled, version numbers will be suppressed, in vio‐
lation of the ISO9660 standard. This does not impact
names stored in the Rockridge or Joliet extension area.
Default: enabled.
iso-level
This enables support for file size and file name exten‐
sions in the core ISO9660 area. The name extensions
specified here do not affect the names stored in the
Rockridge or Joliet extension areas.
iso-level=1
The most compliant form of ISO9660 image. File‐
names are limited to 8.3 uppercase format, direc‐
tory names are limited to 8 uppercase characters,
files are limited to 4 GiB, the complete ISO9660
image cannot exceed 4 GiB.
iso-level=2
Filenames are limited to 30 uppercase characters
with a 30-character extension, directory names
are limited to 30 characters, files are limited
to 4 GiB.
iso-level=3
As with iso-level=2, except that files may exceed
4 GiB.
iso-level=4
As with iso-level=3, except that filenames may be
up to 193 characters and may include arbitrary
8-bit characters.
joliet Microsoft's Joliet extensions store a completely separate
set of directory information about each file. In partic‐
ular, this information includes Unicode filenames of up
to 255 characters. Default: enabled.
limit-depth
If enabled, libarchive will use directory relocation
records to ensure that no pathname exceeds the ISO9660
limit of 8 directory levels. If disabled, no relocation
will occur. Default: enabled.
limit-dirs
If enabled, libarchive will cause an error if there are
more than 65536 directories. If disabled, there is no
limit on the number of directories. Default: enabled
pad If enabled, 300 kiB of zero bytes will be appended to the
end of the archive. Default: enabled
relaxed-filenames
If enabled, all 7-bit ASCII characters are permitted in
filenames (except lowercase characters unless
allow-lowercase is also specified). This violates
ISO9660 standards. This does not impact names stored in
the Rockridge or Joliet extension area. Default: dis‐
abled.
rockridge
The Rockridge extensions store an additional set of
POSIX-style file information with each file, including
mtime, atime, ctime, permissions, and long filenames with
arbitrary 8-bit characters. These extensions also sup‐
port symbolic links and other POSIX file types. Default:
enabled.
Format iso9660 - zisofs support
The zisofs extensions permit each file to be independently com‐
pressed using a gzip-compatible compression. This can provide
significant size savings, but requires the reading system to have
support for these extensions. These extensions are disabled by
default.
compression-level=number
The compression level used by the deflate compressor.
Ranges from 0 (least effort) to 9 (most effort). De‐
fault: 6
zisofs Synonym for zisofs=direct.
zisofs=direct
Compress each file in the archive. Unlike
zisofs=indirect, this is handled entirely within
libarchive and does not require a separate utility. For
best results, libarchive tests each file and will store
the file uncompressed if the compression does not actu‐
ally save any space. In particular, files under 2k will
never be compressed. Note that boot image files are
never compressed.
zisofs=indirect
Recognizes files that have already been compressed with
the mkzftree utility and sets up the necessary file meta‐
data so that readers will correctly identify these as
zisofs-compressed files.
zisofs-exclude=filename
Specifies a filename that should not be compressed when
using zisofs=direct. This option can be provided multi‐
ple times to suppress compression on many files.
Format mtree
cksum, device, flags, gid, gname, indent, link, md5, mode, nlink,
rmd160, sha1, sha256, sha384, sha512, size, time, uid,
uname
Enable a particular keyword in the mtree output. Prefix
with an exclamation mark to disable the corresponding
keyword. The default is equivalent to “device, flags,
gid, gname, link, mode, nlink, size, time, type, uid,
uname”.
all Enables all of the above keywords.
use-set
Enables generation of /set lines that specify default
values for the following files and/or directories.
indent XXX needs explanation XXX
Format newc
hdrcharset
The value is used as a character set name that will be
used when translating file names.
Format odc
hdrcharset
The value is used as a character set name that will be
used when translating file names.
Format pwb
hdrcharset
The value is used as a character set name that will be
used when translating file names.
Format pax
hdrcharset
The value is used as a character set name that will be
used when translating file, group and user names. The
value is one of “BINARY” or “UTF-8”. With “BINARY” there
is no character conversion, with “UTF-8” names are con‐
verted to UTF-8.
xattrheader
When storing extended attributes, this option configures
which headers should be written. The value is one of
“all”, “LIBARCHIVE”, or “SCHILY”. By default, both
“LIBARCHIVE.xattr” and “SCHILY.xattr” headers are writ‐
ten.
Format ustar
hdrcharset
The value is used as a character set name that will be
used when translating file, group and user names.
Format v7tar
hdrcharset
The value is used as a character set name that will be
used when translating file, group and user names.
Format warc
omit-warcinfo
Set to “true” to disable output of the warcinfo record.
Format xar
checksum=type
Use type as file checksum method. Supported values are
“none”, “md5”, and “sha1” (default).
compression=type
Use type as compression method. Supported values are
“none”, “bzip2”, “gzip” (default), “lzma” and “xz”.
compression_level
The value is a decimal integer from 1 to 9 specifying the
compression level.
toc-checksum=type
Use type as table of contents checksum method. Supported
values are “none”, “md5” and “sha1” (default).
Format zip
compression
The value is either “store” or “deflate” to indicate how
the following entries should be compressed. Note that
this setting is ignored for directories, symbolic links,
and other special entries.
compression-level
The value is interpreted as a decimal integer specifying
the compression level. Values between 0 and 9 are sup‐
ported. A compression level of 0 switches the compres‐
sion method to “store”, other values will enable
“deflate” compression with the given level.
encryption
Enable encryption using traditional zip encryption.
encryption=type
Use type as encryption type. Supported values are
“zipcrypt” (traditional zip encryption), “aes128” (WinZip
AES-128 encryption) and “aes256” (WinZip AES-256
encryption).
experimental
This boolean option enables or disables experimental Zip
features that may not be compatible with other Zip imple‐
mentations.
fakecrc32
This boolean option disables CRC calculations. All CRC
fields are set to zero. It should not be used except for
testing purposes.
hdrcharset
The value is used as a character set name that will be
used when translating file names.
zip64 Zip64 extensions provide additional file size information
for entries larger than 4 GiB. They also provide ex‐
tended file offset and archive size information when ar‐
chives exceed 4 GiB. By default, the Zip writer selec‐
tively enables these extensions only as needed. In par‐
ticular, if the file size is unknown, the Zip writer will
include Zip64 extensions to guard against the possibility
that the file might be larger than 4 GiB.
Setting this boolean option will force the writer to use
Zip64 extensions even for small files that would not oth‐
erwise require them. This is primarily useful for test‐
ing.
Disabling this option with !zip64 will force the Zip
writer to avoid Zip64 extensions: It will reject files
with size greater than 4 GiB, it will reject any new en‐
tries once the total archive size reaches 4 GiB, and it
will not use Zip64 extensions for files with unknown
size. In particular, this can improve compatibility when
generating archives where the entry sizes are not known
in advance.
EXAMPLES
The following example creates an archive write handle to create a gzip-
compressed ISO9660 format image. The two options here specify that the
ISO9660 archive will use kernel.img as the boot image for El Torito boot‐
ing, and that the gzip compressor should use the maximum compression
level.
a = archive_write_new();
archive_write_add_filter_gzip(a);
archive_write_set_format_iso9660(a);
archive_write_set_options(a, "boot=kernel.img,compression=9");
archive_write_open_filename(a, filename, blocksize);
ERRORS
More detailed error codes and textual descriptions are available from the
archive_errno() and archive_error_string() functions.
SEE ALSO
tar(1), archive_read_set_options(3), archive_write(3), libarchive(3)
HISTORY
The libarchive library first appeared in FreeBSD 5.3.
AUTHORS
The options support for libarchive was originally implemented by
Michihiro NAKAJIMA.
BUGS
BSD January 31, 2020 BSD
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