Linux Standard Base (LSB) — Part 1-5: Imaging specification

This document defines a system interface for compiled applications and a minimal environment for support of installation scripts. Its purpose is to enable a uniform industry standard environment for high-volume applications conforming to the LSB. These specifications are composed of two basic parts: a common part describing those parts of the interface that remain constant across all implementations of the LSB, and an architecture-specific part describing the parts of the interface that vary by processor architecture. Together, the common part and the relevant architecture-specific part for a single hardware architecture provide a complete interface specification for compiled application programs on systems that share a common hardware architecture. The LSB contains both a set of Application Program Interfaces (APIs) and Application Binary Interfaces (ABIs). APIs may appear in the source code of portable applications, while the compiled binary of that application may use the larger set of ABIs. A conforming implementation provides all of the ABIs listed here. The compilation system may replace (e.g. by macro definition) certain APIs with calls to one or more of the underlying binary interfaces, and may insert calls to binary interfaces as needed. The LSB is primarily a binary interface definition. Not all of the source level APIs available to applications may be contained in this specification. This is the Imaging module of the Linux Standard Base (LSB). This module provides the fundamental system interfaces, libraries, and runtime environment upon which conforming applications and libraries requiring the LSB Imaging module depend. Interfaces described in LSB Imaging are mandatory except where explicitly listed otherwise. Interfaces described in the LSB Imaging module supplement those described in the LSB Core module. They do not depend on other LSB modules.

Noyau de base normalisé Linux (LSB) — Partie 1-5: Spécification du module d'images "Imaging"

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Published
Publication Date
07-Oct-2021
Current Stage
6060 - International Standard published
Start Date
08-Oct-2021
Completion Date
08-Oct-2021
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INTERNATIONAL ISO/IEC
STANDARD 23360-1-5
First edition
2021-10
Linux Standard Base (LSB) —
Part 1-5:
Imaging specification
Reference number
ISO/IEC 23360-1-5:2021(E)
ISO/IEC 2021
---------------------- Page: 1 ----------------------
ISO/IEC 23360-1-5:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 23360-1-5:2021(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are

members of ISO or IEC participate in the development of International Standards through technical

committees established by the respective organization to deal with particular fields of technical activity.

ISO and IEC technical committees collaborate in fields of mutual interest. Other international

organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the

work.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of document should be noted (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details

of any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent

declarations received (see patents.iec.ch).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the World

Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),

see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared by the Linux Foundation as Linux Standard Base (LSB): Imaging

specification and drafted in accordance with its editorial rules. It was assigned to Joint Technical

Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 22, Programming languages, their

environments and system software interfaces, and adopted by National Bodies.

This first edition of ISO/IEC 23360-1-5 cancels and replaces ISO/IEC 23360-1:2006, which has been

technically revised.

This document is based on “The GNU Free Documentation License, version 1.1”. The license is available

at https://www.gnu.org/licenses/old-licenses/fdl-1.1.html.

A list of all parts in the ISO/IEC 23660 series can be found on the ISO and IEC websites.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-

committees.
© ISO/IEC 2021 – All rights reserved iii
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ISO/IEC 23360-1-5:2021(E)
Contents

Foreword ......................................................................................................................................................iii

Introduction ................................................................................................................................................... v

I Introductory Elements ............................................................................................................................. 1

1 Scope .................................................................................................................................................................. 2

2 Normative References ................................................................................................................................ 3

3 Requirements ................................................................................................................................................ 4

3.1 Relevant Libraries .............................................................................................................................. 4

4 Terms and Definitions ................................................................................................................................ 5

5 Documentation Conventions................................................................................................................... 7

6 PPD Format Extensions ............................................................................................................................. 8

II Printing Libraries .................................................................................................................................. 12

7 Libraries ......................................................................................................................................................... 13

7.1 Interfaces for libcups ...................................................................................................................... 13

7.2 Data Definitions for libcups ......................................................................................................... 15

7.3 Interface Definitions for libcups ................................................................................................. 29

7.4 Interfaces for libcupsimage ......................................................................................................... 49

7.5 Data Definitions for libcupsimage ............................................................................................ 50

7.6 Interface Definitions for libcupsimage ................................................................................... 53

III Printing Commands ............................................................................................................................. 56

8 Printing Commands .................................................................................................................................. 57

8.1 Commands and Utilities ................................................................................................................ 57

8.2 Command Behavior ........................................................................................................................ 57

IV Execution Environment .................................................................................................................... 63

9 File System Hierarchy .............................................................................................................................. 64

V Scanning Libraries ................................................................................................................................. 65

10 Libraries ............................................................................................................................................... 66

10.1 Interfaces for libsane ................................................................................................................... 66

10.2 Data Definitions for libsane ...................................................................................................... 66

VI Package Format and Installation .................................................................................................... 75

11 Software Installation ....................................................................................................................... 76

11.1 Package Dependencies ............................................................................................................. 76

Annex A Alphabetical Listing of Interfaces by Library ................................................................. 77

A.1 libsane ............................................................................................................................................................... 77

A.2 libcups ............................................................................................................................................................... 77

A.3 libcupsimage .................................................................................................................................................. 79

© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
Introduction
The LSB defines a binary interface for application programs that are compiled
and packaged for LSB-conforming implementations on many different hardware
architectures. A binary specification must include information specific to the

computer processor architecture for which it is intended. To avoid the complexity

of conditional descriptions, the specification has instead been divided into
generic parts which are augmented by one of several architecture-specific parts,
depending on the target processor architecture; the generic part will indicate
when reference must be made to the architecture part, and vice versa.
This document should be used in conjunction with the documents it references.
This document enumerates the system components it includes, but descriptions
of those components may be included entirely or partly in this document, partly
in other documents, or entirely in other reference documents. For example, the
section that describes system service routines includes a list of the system
routines supported in this interface, formal declarations of the data structures
they use that are visible to applications, and a pointer to the underlying
referenced specification for information about the syntax and semantics of each

call. Only those routines not described in standards referenced by this document,

or extensions to those standards, are described in the detail. Information
referenced in this way is as much a part of this document as is the information
explicitly included here.
The specification carries a version number of either the form x.y or x.y.z. This
version number carries the following meaning:
1. The first number (x) is the major version number. Versions sharing the same
major version number shall be compatible in a backwards direction; that is,
a newer version shall be compatible with an older version. Any deletion of
a library results in a new major version number. Interfaces marked as
deprecated may be removed from the specification at a major version
change.
2. The second number (y) is the minor version number. Libraries and
individual interfaces may be added, but not removed. Interfaces may be
marked as deprecated at a minor version change. Other minor changes may
be permitted at the discretion of the LSB workgroup.

3. The third number (z), if present, is the editorial level. Only editorial changes

should be included in such versions.

Since this specification is a descriptive Application Binary Interface, and not a

source level API specification, it is not possible to make a guarantee of 100%
backward compatibility between major releases. However, it is the intent that

those parts of the binary interface that are visible in the source level API will

remain backward compatible from version to version, except where a feature
marked as "Deprecated" in one release may be removed from a future release.
Implementors are strongly encouraged to make use of symbol versioning to
permit simultaneous support of applications conforming to different releases of
this specification.
LSB is a trademark of the Linux Foundation. Developers of applications or
implementations interested in using the trademark should see the Linux
Foundation Certification Policy for details.
v © ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
I Introductory Elements
© ISO/IEC 2021 – All rights reserved 1
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ISO/IEC 23360-1-5:2021(E)
1 Scope
The Linux Standard Base (LSB) defines a system interface for compiled
applications and a minimal environment for support of installation scripts. Its
purpose is to enable a uniform industry standard environment for high-volume
applications conforming to the LSB.
These specifications are composed of two basic parts: a common part describing

those parts of the interface that remain constant across all implementations of the

LSB, and an architecture-specific part describing the parts of the interface that

vary by processor architecture. Together, the common part and the relevant
architecture-specific part for a single hardware architecture provide a complete
interface specification for compiled application programs on systems that share
a common hardware architecture.
The LSB contains both a set of Application Program Interfaces (APIs) and
Application Binary Interfaces (ABIs). APIs may appear in the source code of
portable applications, while the compiled binary of that application may use the
larger set of ABIs. A conforming implementation provides all of the ABIs listed
here. The compilation system may replace (e.g. by macro definition) certain APIs

with calls to one or more of the underlying binary interfaces, and may insert calls

to binary interfaces as needed.

The LSB is primarily a binary interface definition. Not all of the source level APIs

available to applications may be contained in this specification.
This is the Imaging module of the Linux Standard Base (LSB). This module
provides the fundamental system interfaces, libraries, and runtime environment
upon which conforming applications and libraries requiring the LSB Imaging
module depend.
Interfaces described in LSB Imaging are mandatory except where explicitly listed
otherwise. Interfaces described in the LSB Imaging module supplement those
described in the LSB Core module. They do not depend on other LSB modules.
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
2 Normative References
The specifications listed below are referenced in whole or in part by the LSB
Imaging specification. Such references may be normative or informative; a

reference to specification shall only be considered normative if it is explicitly cited

as such. The LSB Imaging specification may make normative references to a

portion of these specifications (that is, to define a specific function or group of

functions); in such cases, only the explicitly referenced portion of the specification

is to be considered normative.
Table 2-1 Normative References
Name Title URL
CUPS API Reference CUPS 1.2 API Reference http://www.cups.org/
documentation.php/do
c-1.2/
Filesystem Hierarchy Filesystem Hierarchy http://refspecs.linuxba
Standard Standard (FHS) 3.0 se.org/fhs
ISO C (1999) ISO/IEC 9899:1999 -
Programming
Languages -- C
PPD Specification PostScript Printer http://partners.adobe.c
Description File Format om/public/developer/
Specification version 4.3 en/ps/5003.PPD_Spec_
v4.3.pdf
PPD Specification Update to PPD http://partners.adobe.c
Update Specification Version om/public/developer/
4.3 en/ps/5645.PPD_Upda
te.pdf
SANE Standard Version SANE Standard Version http://www.sane-
1.04 1.04 project.org/html/
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ISO/IEC 23360-1-5:2021(E)
3 Requirements
3.1 Relevant Libraries

The libraries listed in Table 3-1 shall be available on a Linux Standard Base system,

with the specified runtime names. This list may be supplemented or amended by
an architecture-specific specification.
Table 3-1 Standard Library Names
Library Runtime Name
libcups libcups.so.2
libcupsimage libcupsimage.so.2
libsane libsane.so.1
These libraries will be in an implementation-defined directory which the
dynamic linker shall search by default.
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
4 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO/IEC
2382, ISO 80000–2, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the
following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4.1
archLSB
Some LSB specification documents have both a generic, architecture-neutral
part and an architecture-specific part. The latter describes elements whose
definitions may be unique to a particular processor architecture. The term
archLSB may be used in the generic part to refer to the corresponding section
of the architecture-specific part.
4.2
Binary Standard, ABI
The total set of interfaces that are available to be used in the compiled binary
code of a conforming application, including the run-time details such as
calling conventions, binary format, C++ name mangling, etc.
4.3
Implementation-defined
Describes a value or behavior that is not defined by this document but is
selected by an implementor. The value or behavior may vary among
implementations that conform to this document. An application should not
rely on the existence of the value or behavior. An application that relies on
such a value or behavior cannot be assured to be portable across conforming
implementations. The implementor shall document such a value or behavior
so that it can be used correctly by an application.
4.4
Shell Script

A file that is read by an interpreter (e.g., awk). The first line of the shell script

includes a reference to its interpreter binary.
© ISO/IEC 2021 – All rights reserved 5
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ISO/IEC 23360-1-5:2021(E)
4.5
Source Standard, API

The total set of interfaces that are available to be used in the source code of a

conforming application. Due to translations, the Binary Standard and the
Source Standard may contain some different interfaces.
4.6
Undefined
Describes the nature of a value or behavior not defined by this document
which results from use of an invalid program construct or invalid data input.
The value or behavior may vary among implementations that conform to
this document. An application should not rely on the existence or validity of
the value or behavior. An application that relies on any particular value or
behavior cannot be assured to be portable across conforming
implementations.
4.7
Unspecified
Describes the nature of a value or behavior not specified by this document
which results from use of a valid program construct or valid data input. The
value or behavior may vary among implementations that conform to this
document. An application should not rely on the existence or validity of the
value or behavior. An application that relies on any particular value or
behavior cannot be assured to be portable across conforming
implementations.

In addition, for the portions of this specification which build on IEEE Std 1003.1-

2001, the definitions given in IEEE Std 1003.1-2001, Base Definitions, Chapter 3
apply.
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
5 Documentation Conventions
Throughout this document, the following typographic conventions are used:
function()
the name of a function
command
the name of a command or utility
CONSTANT
a constant value
parameter
a parameter
variable
a variable
Throughout this specification, several tables of interfaces are presented. Each
entry in these tables has the following format:
name
the name of the interface
(symver)
An optional symbol version identifier, if required.
[refno]
A reference number indexing the table of referenced specifications that
follows this table.
For example,
forkpty(GLIBC_2.0) [SUSv4]
refers to the interface named forkpty() with symbol version GLIBC_2.0 that is
defined in the reference indicated by the tag SUSv4.
Note: For symbols with versions which differ between architectures, the symbol

versions are defined in the architecture specific parts of of this module specification

only. In the generic part, they will appear without symbol versions.
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ISO/IEC 23360-1-5:2021(E)
6 PPD Format Extensions

The Postscript Printer Description (PPD) format is used in a text file to describe

device capabilities for a printing device. PPD files shall conform to the format
described by PPD Specification and PPD Specification Update. In addition,

several extensions to the standard attribute list are recognized, as listed below.

The "cupsVersion" attribute is required in a compliant PPD, while the other
attributes are optional.
cupsColorProfile
This string attribute specifies an sRGB-based color profile consisting of
gamma and density controls and a 3x3 CMY color transform matrix.
The attribute has the following parameter usage:
*cupsColorProfile Resolution/MediaType: "density gamma m00 m01 m02
m10 m11 m12 m20 m21 m22"
The Resolution and MediaType values may be "-" to act as a wildcard.
Otherwise, they must match one of the Resolution or MediaType attributes
defined in the PPD file.
The density and gamma values define the gamma and density adjustment
function such that (in terms of C math):
f(x) = density * pow(x, gamma)
The m00 through m22 values define a 3x3 transformation matrix for the CMY
color values. The density function is applied after the CMY transformation:
| m00 m01 m02 | | m10 m11 m12 | | m20 m21 m22 |
cupsFax
This boolean attribute specifies whether the PPD defines a facsimile device.
The default is false.
cupsFilter
The attribute has the following parameter usage:
*cupsFilter: "source/type cost program"
This string attribute provides a conversion rule from the given source type
to the printer's native format using the filter "program". A source type is
specified according to the conventions of the MIME specification, using
"type/subtype" nomenclature, and may refer to a standard MIME type or a
CUPS-specific MIME type using the prefix "vnd.cups-" in the subtype. If a
printer supports the source type directly, the special filter program "-" may
be specified. The cost is an arbitrary positive integer, used to calculate the
relative impact a print job has on system load.
cupsManualCopies

This boolean attribute notifies the RIP filters that the destination printer does

not support copy generation in hardware. The default value is false.
cupsModelNumber
This integer attribute specifies a printer-specific model number. This number
can be used by a filter program to adjust the output for a specific model of
printer.
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
cupsVersion
The attribute has the following parameter usage:
*cupsVersion: "major.minor"
This required attribute describes which version of the CUPS PPD file
extensions was used. Currently it must be the string "1.0" or "1.1". The strings
"1.2" and "1.3" represent newer versions of the CUPS PPD API that are not
covered in this version of the specification, and are currently not allowed,
although they may be found in non-conforming PPDs which use a newer
version of the CUPS PPD specification.
FoomaticIDs
The attribute has the following parameter usage:
*FoomaticIDs printer driver
The parameters correspond to the IDs in the Foomatic database for the
printer and driver, respectively.
FoomaticNoPageAccounting
This boolean attribute tells foomatic-rip whether or not to insert accounting
information into the PostScript data stream. By default, foomatic-rip will
insert this information.
FoomaticRIPCommandLine
The attribute has the following parameter usage:
*FoomaticRIPCommandLine "code"
This attribute defines the command line in the "code" parameter for the
renderer that is called by foomatic-rip. The command must take PostScript
on standard input and provide the job data stream in the printer's native
language on standard output. The command must exit with status 0 if the
conversion was successful and exit with another status if an error occurs. The
"code" parameter may contain option setting wildcards, as described below
under "FoomaticRIPOption".
FoomaticRIPDefault
The attribute has the following parameter usage:
*FoomaticRIPDefaultOptionName value
This attribute sets a default for a Foomatic option. The name of the attribute
should contain the name of the option appended to "FoomaticRIPDefault",
with the desired default value as the only parameter.
This option is only used to provide numeric options in the PPD, which are
not supported by the Adobe spec, via enumerated options, and should not
be used except for that purpose.
FoomaticRIPOption
The attribute has the following parameter usage:
*FoomaticRIPOption name: type style spot [order]
This attribute sets options for the command line specified in the
"FoomaticRIPCommandLine" attribute. The "name" parameter specifies the
option name, the "type" parameter specifies the option type, the "style"
© ISO/IEC 2021 – All rights reserved 9
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ISO/IEC 23360-1-5:2021(E)
parameter specifies one of "CmdLine", "JCL", "PS", or "Composite", and the
"spot" parameter specifies a letter, which is prepended with a "%" and used
in the "FoomaticRIPCommandLine" attribute to indicate where the option
should go in the command line. The optional "order" parameter indicates an
order number for one-choice options.
FoomaticRIPOptionAllowedChars
The attribute has the following parameter usage:
*FoomaticRIPOptionAllowedChars name: "code"
This option sets a list of allowed characters in a string option. The "name"
parameter identifies the option, while the "code" parameter is a list of
allowed characters.
FoomaticRIPOptionAllowedRegExp
The attribute has the following parameter usage:
*FoomaticRIPOptionAllowedRegExp name: "code"
This option causes the option named by "name" to be validated by the Perl-
style regular expression in "code".
FoomaticRIPOptionMaxLength
The attribute has the following parameter usage:
*FoomaticRIPOptionMaxLength name: length
For string or password options, this attribute sets a maximum length which
can be returned. The "name" parameter identifies the option, and the "length"
parameter is the maximum number of characters allowed.
FoomaticRIPOptionPrototype
The attribute has the following parameter usage:
*FoomaticRIPOptionPrototype name: "code"
For string, password, or simulated numeric options, this attribute sets a code
prototype to be inserted into the output. This works for options where the
FoomaticRIPOption "style" parameter is set to CmdLine, JCL, or PS. The
value of the option can be represented with the string "%s" in the "code"
parameter.
FoomaticRIPOptionRange
The attribute has the following parameter usage:
*FoomaticRIPOptionRange name: min max
This attribute adds a minimux and maximum limit to numeric options (that
are simulated by Foomatic via emumerated options). The "name" parameter
identifies the option, while the "min" and "max" parameters set the
minumum and maximum allowed values, respectively, for the option.
FoomaticRIPOptionSetting
The attribute has the following parameter usage:
*FoomaticRIPOptionSetting name=choice: "code"
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
This attribute adds code to an option, identified by "name", with a
FoomaticRIPOption "style" parameter set to Composite. It inserts options for
other options that are members of the Composite option "name".
FoomaticRIPPostPipe
The attribute has the following parameter usage:
*FoomaticRIPPostPipe "code"
This attribute defines the command line in the "code" parameter for the job
output command used by foomatic-rip in standalone mode. The command
should take printer-native data on standard input. The "code" parameter
should include the preceding shell pipe symbol ("|").
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ISO/IEC 23360-1-5:2021(E)
II Printing Libraries
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 23360-1-5:2021(E)
7 Libraries
7.1 Interfaces for libcups

Table 7-1 defines the library name and shared object name for the libcups library

Table 7-1 libcups Definition
Library: libcups
SONAME: libcups.so.2

The behavior of the interfaces in this library is specified by the following specifi-

cations:
[CUPS 1.2] CUPS API Reference
[LSB] This Spec
...

INTERNATIONAL ISO/IEC
STANDARD 23360-1-5
First edition
2021-08
Linux Standard Base (LSB) —
Part 1-5:
Imaging specification
Reference number
ISO/IEC 23360-1-5:2021(E)
ISO/IEC 2021
---------------------- Page: 1 ----------------------
ISO/IEC 23360-1-5:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 23360-1-5:2021(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are

members of ISO or IEC participate in the development of International Standards through technical

committees established by the respective organization to deal with particular fields of technical activity.

ISO and IEC technical committees collaborate in fields of mutual interest. Other international

organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the

work.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of document should be noted (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details

of any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent

declarations received (see patents.iec.ch).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the World

Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),

see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared by the Linux Foundation [as Linux Standard Base (LSB): Imaging

specification] and drafted in accordance with its editorial rules. It was assigned to Joint Technical

Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 22, Programming languages, their

environments and system software interfaces, and adopted by National Bodies.

This first edition of ISO/IEC 23360-1-5 cancels and replaces ISO/IEC 23360-1:2006, which has been

technically revised.

A list of all parts in the ISO/IEC 23660 series can be found on the ISO and IEC websites.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-

committees.
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ISO/IEC 23360-1-5:2021(E)
Contents

Foreword ......................................................................................................................................................iii

Introduction ................................................................................................................................................... v

I Introductory Elements ............................................................................................................................. 1

1 Scope .................................................................................................................................................................. 2

2 Normative References ................................................................................................................................ 3

3 Requirements ................................................................................................................................................ 4

3.1 Relevant Libraries .............................................................................................................................. 4

4 Terms and Definitions ................................................................................................................................ 5

5 Documentation Conventions................................................................................................................... 7

6 PPD Format Extensions ............................................................................................................................. 8

II Printing Libraries .................................................................................................................................. 12

7 Libraries ......................................................................................................................................................... 13

7.1 Interfaces for libcups ...................................................................................................................... 13

7.2 Data Definitions for libcups ......................................................................................................... 15

7.3 Interface Definitions for libcups ................................................................................................. 29

7.4 Interfaces for libcupsimage ......................................................................................................... 49

7.5 Data Definitions for libcupsimage ............................................................................................ 50

7.6 Interface Definitions for libcupsimage ................................................................................... 53

III Printing Commands ............................................................................................................................. 56

8 Printing Commands .................................................................................................................................. 57

8.1 Commands and Utilities ................................................................................................................ 57

8.2 Command Behavior ........................................................................................................................ 57

IV Execution Environment .................................................................................................................... 63

9 File System Hierarchy .............................................................................................................................. 64

V Scanning Libraries ................................................................................................................................. 65

10 Libraries ............................................................................................................................................... 66

10.1 Interfaces for libsane ................................................................................................................... 66

10.2 Data Definitions for libsane ...................................................................................................... 66

VI Package Format and Installation .................................................................................................... 75

11 Software Installation ....................................................................................................................... 76

11.1 Package Dependencies ............................................................................................................. 76

Annex A Alphabetical Listing of Interfaces by Library ................................................................. 77

A.1 libsane ............................................................................................................................................................... 77

A.2 libcups ............................................................................................................................................................... 77

A.3 libcupsimage .................................................................................................................................................. 79

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ISO/IEC 23360-1-5:2021(E)
Introduction
The LSB defines a binary interface for application programs that are compiled
and packaged for LSB-conforming implementations on many different hardware
architectures. A binary specification must include information specific to the

computer processor architecture for which it is intended. To avoid the complexity

of conditional descriptions, the specification has instead been divided into
generic parts which are augmented by one of several architecture-specific parts,
depending on the target processor architecture; the generic part will indicate
when reference must be made to the architecture part, and vice versa.
This document should be used in conjunction with the documents it references.
This document enumerates the system components it includes, but descriptions
of those components may be included entirely or partly in this document, partly
in other documents, or entirely in other reference documents. For example, the
section that describes system service routines includes a list of the system
routines supported in this interface, formal declarations of the data structures
they use that are visible to applications, and a pointer to the underlying
referenced specification for information about the syntax and semantics of each

call. Only those routines not described in standards referenced by this document,

or extensions to those standards, are described in the detail. Information
referenced in this way is as much a part of this document as is the information
explicitly included here.
The specification carries a version number of either the form x.y or x.y.z. This
version number carries the following meaning:
1. The first number (x) is the major version number. Versions sharing the same
major version number shall be compatible in a backwards direction; that is,
a newer version shall be compatible with an older version. Any deletion of
a library results in a new major version number. Interfaces marked as
deprecated may be removed from the specification at a major version
change.
2. The second number (y) is the minor version number. Libraries and
individual interfaces may be added, but not removed. Interfaces may be
marked as deprecated at a minor version change. Other minor changes may
be permitted at the discretion of the LSB workgroup.

3. The third number (z), if present, is the editorial level. Only editorial changes

should be included in such versions.

Since this specification is a descriptive Application Binary Interface, and not a

source level API specification, it is not possible to make a guarantee of 100%
backward compatibility between major releases. However, it is the intent that

those parts of the binary interface that are visible in the source level API will

remain backward compatible from version to version, except where a feature
marked as "Deprecated" in one release may be removed from a future release.
Implementors are strongly encouraged to make use of symbol versioning to
permit simultaneous support of applications conforming to different releases of
this specification.
LSB is a trademark of the Linux Foundation. Developers of applications or
implementations interested in using the trademark should see the Linux
Foundation Certification Policy for details.
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ISO/IEC 23360-1-5:2021(E)
I Introductory Elements
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ISO/IEC 23360-1-5:2021(E)
1 Scope
The Linux Standard Base (LSB) defines a system interface for compiled
applications and a minimal environment for support of installation scripts. Its
purpose is to enable a uniform industry standard environment for high-volume
applications conforming to the LSB.
These specifications are composed of two basic parts: a common part describing

those parts of the interface that remain constant across all implementations of the

LSB, and an architecture-specific part describing the parts of the interface that

vary by processor architecture. Together, the common part and the relevant
architecture-specific part for a single hardware architecture provide a complete
interface specification for compiled application programs on systems that share
a common hardware architecture.
The LSB contains both a set of Application Program Interfaces (APIs) and
Application Binary Interfaces (ABIs). APIs may appear in the source code of
portable applications, while the compiled binary of that application may use the
larger set of ABIs. A conforming implementation provides all of the ABIs listed
here. The compilation system may replace (e.g. by macro definition) certain APIs

with calls to one or more of the underlying binary interfaces, and may insert calls

to binary interfaces as needed.

The LSB is primarily a binary interface definition. Not all of the source level APIs

available to applications may be contained in this specification.
This is the Imaging module of the Linux Standard Base (LSB). This module
provides the fundamental system interfaces, libraries, and runtime environment
upon which conforming applications and libraries requiring the LSB Imaging
module depend.
Interfaces described in LSB Imaging are mandatory except where explicitly listed
otherwise. Interfaces described in the LSB Imaging module supplement those
described in the LSB Core module. They do not depend on other LSB modules.
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ISO/IEC 23360-1-5:2021(E)
2 Normative References
The specifications listed below are referenced in whole or in part by the LSB
Imaging specification. Such references may be normative or informative; a

reference to specification shall only be considered normative if it is explicitly cited

as such. The LSB Imaging specification may make normative references to a

portion of these specifications (that is, to define a specific function or group of

functions); in such cases, only the explicitly referenced portion of the specification

is to be considered normative.
Table 2-1 Normative References
Name Title URL
CUPS API Reference CUPS 1.2 API Reference http://www.cups.org/
documentation.php/do
c-1.2/
Filesystem Hierarchy Filesystem Hierarchy http://refspecs.linuxba
Standard Standard (FHS) 3.0 se.org/fhs
ISO C (1999) ISO/IEC 9899:1999 -
Programming
Languages -- C
PPD Specification PostScript Printer http://partners.adobe.c
Description File Format om/public/developer/
Specification version 4.3 en/ps/5003.PPD_Spec_
v4.3.pdf
PPD Specification Update to PPD http://partners.adobe.c
Update Specification Version om/public/developer/
4.3 en/ps/5645.PPD_Upda
te.pdf
SANE Standard Version SANE Standard Version http://www.sane-
1.04 1.04 project.org/html/
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ISO/IEC 23360-1-5:2021(E)
3 Requirements
3.1 Relevant Libraries

The libraries listed in Table 3-1 shall be available on a Linux Standard Base system,

with the specified runtime names. This list may be supplemented or amended by
an architecture-specific specification.
Table 3-1 Standard Library Names
Library Runtime Name
libcups libcups.so.2
libcupsimage libcupsimage.so.2
libsane libsane.so.1
These libraries will be in an implementation-defined directory which the
dynamic linker shall search by default.
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ISO/IEC 23360-1-5:2021(E)
4 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO/IEC
2382, ISO 80000–2, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the
following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4.1
archLSB
Some LSB specification documents have both a generic, architecture-neutral
part and an architecture-specific part. The latter describes elements whose
definitions may be unique to a particular processor architecture. The term
archLSB may be used in the generic part to refer to the corresponding section
of the architecture-specific part.
4.2
Binary Standard, ABI
The total set of interfaces that are available to be used in the compiled binary
code of a conforming application, including the run-time details such as
calling conventions, binary format, C++ name mangling, etc.
4.3
Implementation-defined
Describes a value or behavior that is not defined by this document but is
selected by an implementor. The value or behavior may vary among
implementations that conform to this document. An application should not
rely on the existence of the value or behavior. An application that relies on
such a value or behavior cannot be assured to be portable across conforming
implementations. The implementor shall document such a value or behavior
so that it can be used correctly by an application.
4.4
Shell Script

A file that is read by an interpreter (e.g., awk). The first line of the shell script

includes a reference to its interpreter binary.
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ISO/IEC 23360-1-5:2021(E)
4.5
Source Standard, API

The total set of interfaces that are available to be used in the source code of a

conforming application. Due to translations, the Binary Standard and the
Source Standard may contain some different interfaces.
4.6
Undefined
Describes the nature of a value or behavior not defined by this document
which results from use of an invalid program construct or invalid data input.
The value or behavior may vary among implementations that conform to
this document. An application should not rely on the existence or validity of
the value or behavior. An application that relies on any particular value or
behavior cannot be assured to be portable across conforming
implementations.
4.7
Unspecified
Describes the nature of a value or behavior not specified by this document
which results from use of a valid program construct or valid data input. The
value or behavior may vary among implementations that conform to this
document. An application should not rely on the existence or validity of the
value or behavior. An application that relies on any particular value or
behavior cannot be assured to be portable across conforming
implementations.

In addition, for the portions of this specification which build on IEEE Std 1003.1-

2001, the definitions given in IEEE Std 1003.1-2001, Base Definitions, Chapter 3
apply.
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ISO/IEC 23360-1-5:2021(E)
5 Documentation Conventions
Throughout this document, the following typographic conventions are used:
function()
the name of a function
command
the name of a command or utility
CONSTANT
a constant value
parameter
a parameter
variable
a variable
Throughout this specification, several tables of interfaces are presented. Each
entry in these tables has the following format:
name
the name of the interface
(symver)
An optional symbol version identifier, if required.
[refno]
A reference number indexing the table of referenced specifications that
follows this table.
For example,
forkpty(GLIBC_2.0) [SUSv4]
refers to the interface named forkpty() with symbol version GLIBC_2.0 that is
defined in the reference indicated by the tag SUSv4.
Note: For symbols with versions which differ between architectures, the symbol

versions are defined in the architecture specific parts of of this module specification

only. In the generic part, they will appear without symbol versions.
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ISO/IEC 23360-1-5:2021(E)
6 PPD Format Extensions

The Postscript Printer Description (PPD) format is used in a text file to describe

device capabilities for a printing device. PPD files shall conform to the format
described by PPD Specification and PPD Specification Update. In addition,

several extensions to the standard attribute list are recognized, as listed below.

The "cupsVersion" attribute is required in a compliant PPD, while the other
attributes are optional.
cupsColorProfile
This string attribute specifies an sRGB-based color profile consisting of
gamma and density controls and a 3x3 CMY color transform matrix.
The attribute has the following parameter usage:
*cupsColorProfile Resolution/MediaType: "density gamma m00 m01 m02
m10 m11 m12 m20 m21 m22"
The Resolution and MediaType values may be "-" to act as a wildcard.
Otherwise, they must match one of the Resolution or MediaType attributes
defined in the PPD file.
The density and gamma values define the gamma and density adjustment
function such that (in terms of C math):
f(x) = density * pow(x, gamma)
The m00 through m22 values define a 3x3 transformation matrix for the CMY
color values. The density function is applied after the CMY transformation:
| m00 m01 m02 | | m10 m11 m12 | | m20 m21 m22 |
cupsFax
This boolean attribute specifies whether the PPD defines a facsimile device.
The default is false.
cupsFilter
The attribute has the following parameter usage:
*cupsFilter: "source/type cost program"
This string attribute provides a conversion rule from the given source type
to the printer's native format using the filter "program". A source type is
specified according to the conventions of the MIME specification, using
"type/subtype" nomenclature, and may refer to a standard MIME type or a
CUPS-specific MIME type using the prefix "vnd.cups-" in the subtype. If a
printer supports the source type directly, the special filter program "-" may
be specified. The cost is an arbitrary positive integer, used to calculate the
relative impact a print job has on system load.
cupsManualCopies

This boolean attribute notifies the RIP filters that the destination printer does

not support copy generation in hardware. The default value is false.
cupsModelNumber
This integer attribute specifies a printer-specific model number. This number
can be used by a filter program to adjust the output for a specific model of
printer.
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ISO/IEC 23360-1-5:2021(E)
cupsVersion
The attribute has the following parameter usage:
*cupsVersion: "major.minor"
This required attribute describes which version of the CUPS PPD file
extensions was used. Currently it must be the string "1.0" or "1.1". The strings
"1.2" and "1.3" represent newer versions of the CUPS PPD API that are not
covered in this version of the specification, and are currently not allowed,
although they may be found in non-conforming PPDs which use a newer
version of the CUPS PPD specification.
FoomaticIDs
The attribute has the following parameter usage:
*FoomaticIDs printer driver
The parameters correspond to the IDs in the Foomatic database for the
printer and driver, respectively.
FoomaticNoPageAccounting
This boolean attribute tells foomatic-rip whether or not to insert accounting
information into the PostScript data stream. By default, foomatic-rip will
insert this information.
FoomaticRIPCommandLine
The attribute has the following parameter usage:
*FoomaticRIPCommandLine "code"
This attribute defines the command line in the "code" parameter for the
renderer that is called by foomatic-rip. The command must take PostScript
on standard input and provide the job data stream in the printer's native
language on standard output. The command must exit with status 0 if the
conversion was successful and exit with another status if an error occurs. The
"code" parameter may contain option setting wildcards, as described below
under "FoomaticRIPOption".
FoomaticRIPDefault
The attribute has the following parameter usage:
*FoomaticRIPDefaultOptionName value
This attribute sets a default for a Foomatic option. The name of the attribute
should contain the name of the option appended to "FoomaticRIPDefault",
with the desired default value as the only parameter.
This option is only used to provide numeric options in the PPD, which are
not supported by the Adobe spec, via enumerated options, and should not
be used except for that purpose.
FoomaticRIPOption
The attribute has the following parameter usage:
*FoomaticRIPOption name: type style spot [order]
This attribute sets options for the command line specified in the
"FoomaticRIPCommandLine" attribute. The "name" parameter specifies the
option name, the "type" parameter specifies the option type, the "style"
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ISO/IEC 23360-1-5:2021(E)
parameter specifies one of "CmdLine", "JCL", "PS", or "Composite", and the
"spot" parameter specifies a letter, which is prepended with a "%" and used
in the "FoomaticRIPCommandLine" attribute to indicate where the option
should go in the command line. The optional "order" parameter indicates an
order number for one-choice options.
FoomaticRIPOptionAllowedChars
The attribute has the following parameter usage:
*FoomaticRIPOptionAllowedChars name: "code"
This option sets a list of allowed characters in a string option. The "name"
parameter identifies the option, while the "code" parameter is a list of
allowed characters.
FoomaticRIPOptionAllowedRegExp
The attribute has the following parameter usage:
*FoomaticRIPOptionAllowedRegExp name: "code"
This option causes the option named by "name" to be validated by the Perl-
style regular expression in "code".
FoomaticRIPOptionMaxLength
The attribute has the following parameter usage:
*FoomaticRIPOptionMaxLength name: length
For string or password options, this attribute sets a maximum length which
can be returned. The "name" parameter identifies the option, and the "length"
parameter is the maximum number of characters allowed.
FoomaticRIPOptionPrototype
The attribute has the following parameter usage:
*FoomaticRIPOptionPrototype name: "code"
For string, password, or simulated numeric options, this attribute sets a code
prototype to be inserted into the output. This works for options where the
FoomaticRIPOption "style" parameter is set to CmdLine, JCL, or PS. The
value of the option can be represented with the string "%s" in the "code"
parameter.
FoomaticRIPOptionRange
The attribute has the following parameter usage:
*FoomaticRIPOptionRange name: min max
This attribute adds a minimux and maximum limit to numeric options (that
are simulated by Foomatic via emumerated options). The "name" parameter
identifies the option, while the "min" and "max" parameters set the
minumum and maximum allowed values, respectively, for the option.
FoomaticRIPOptionSetting
The attribute has the following parameter usage:
*FoomaticRIPOptionSetting name=choice: "code"
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ISO/IEC 23360-1-5:2021(E)
This attribute adds code to an option, identified by "name", with a
FoomaticRIPOption "style" parameter set to Composite. It inserts options for
other options that are members of the Composite option "name".
FoomaticRIPPostPipe
The attribute has the following parameter usage:
*FoomaticRIPPostPipe "code"
This attribute defines the command line in the "code" parameter for the job
output command used by foomatic-rip in standalone mode. The command
should take printer-native data on standard input. The "code" parameter
should include the preceding shell pipe symbol ("|").
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ISO/IEC 23360-1-5:2021(E)
II Printing Libraries
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ISO/IEC 23360-1-5:2021(E)
7 Libraries
7.1 Interfaces for libcups

Table 7-1 defines the library name and shared object name for the libcups library

Table 7-1 libcups Definition
Library: libcups
SONAME: libcups.so.2

The behavior of the interfaces in this library is specified by the following specifi-

cations:
[CUPS 1.2] CUPS API Reference
[LSB] This Specification
7.1.1 CUPS Convenience ABI
7.1.1.1 Interfaces for CUPS Convenience ABI
An LSB conforming implementation shall provide the generic functions for CUPS
...

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