goipp

package module
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 Go to latest Published: May 17, 2020 License: BSD-2-Clause Imports: 7 Imported by: 17

README

goipp

godoc.org GitHub Go Report Card

The goipp library is fairly complete implementation of IPP core protocol in pure Go. Essentially, it is IPP messages parser/composer. Transport is not implemented here, because Go standard library has an excellent built-in HTTP client, and it doesn't make a lot of sense to wrap it here.

High-level requests, like "print a file" are also not implemented, only the low-level stuff.

All documentation is on godoc.org -- follow the link above. Pull requests are welcomed, assuming they don't break existing API.

Documentation

Overview

Package goipp implements IPP core protocol, as defined by RFC 8010

It doesn't implement high-level operations, such as "print a document", "cancel print job" and so on. It's scope is limited to proper generation and parsing of IPP requests and responses. 

IPP protocol uses the following simple model:
1. Send a request
2. Receive a response

Request and response both has a similar format, represented here by type Message, with the only difference, that Code field of that Message is the Operation code in request and Status code in response. So most of operations are common for request and response messages

Example: 

    package main

    import (
	    "bytes"
	    "net/http"
	    "os"

	    "github.com/OpenPrinting/goipp"
    )

    const uri = "http://192.168.1.102:631"

    // Build IPP OpGetPrinterAttributes request
    func makeRequest() ([]byte, error) {
	    m := goipp.NewRequest(goipp.DefaultVersion, goipp.OpGetPrinterAttributes, 1)
	    m.Operation.Add(goipp.MakeAttribute("attributes-charset",
		    goipp.TagCharset, goipp.String("utf-8")))
	    m.Operation.Add(goipp.MakeAttribute("attributes-natural-language",
		    goipp.TagLanguage, goipp.String("en-US")))
	    m.Operation.Add(goipp.MakeAttribute("printer-uri",
		    goipp.TagURI, goipp.String(uri)))
	    m.Operation.Add(goipp.MakeAttribute("requested-attributes",
		    goipp.TagKeyword, goipp.String("all")))

	    return m.EncodeBytes()
    }

    // Check that there is no error
    func check(err error) {
	    if err != nil {
		    panic(err)
	    }
    }

    func main() {
	    request, err := makeRequest()
	    check(err)

	    resp, err := http.Post(uri, goipp.ContentType, bytes.NewBuffer(request))
	    check(err)

	    var respMsg goipp.Message

	    err = respMsg.Decode(resp.Body)
	    check(err)

	    respMsg.Print(os.Stdout, false)
    }

Index

Constants

View Source 
const (
	// ContentType is the HTTP content type for IPP messages
	ContentType = "application/ipp"
)

Variables

This section is empty.

Functions

func ValueEqual 

func ValueEqual(v1, v2 Value) bool

ValueEqual checks if two values are equal

Types

type Attribute 

type Attribute struct {
	Name   string // Attribute name
	Values Values // Slice of values
}

Attribute represents a single attribute

func MakeAttribute 

func MakeAttribute(name string, tag Tag, value Value) Attribute

MakeAttribute makes Attribute with single value

func (Attribute) Equal 

func (a Attribute) Equal(a2 Attribute) bool

Equal checks that Attribute is equal to another Attribute (i.e., names are the same and values are equal

type Attributes 

type Attributes []Attribute

Attributes represents a slice of attributes

func (*Attributes) Add 

func (attrs *Attributes) Add(attr Attribute)

Add Attribute to Attributes

func (Attributes) Equal 

func (attrs Attributes) Equal(attrs2 Attributes) bool

Equal checks that attrs and attrs2 are equal

type Binary 

type Binary []byte

Binary represents a raw binary Value

func (Binary) String 

func (v Binary) String() string

String() converts Range value to string

func (Binary) Type 

func (Binary) Type() Type

Type returns type of Value

type Boolean 

type Boolean bool

Boolean represents a boolean Value

Use with: TagBoolean

func (Boolean) String 

func (v Boolean) String() string

String() converts Boolean value to string

func (Boolean) Type 

func (Boolean) Type() Type

Type returns type of Value

type Code 

type Code uint16

Code represents Op(operation) or Status codes

type Collection 

type Collection Attributes

Collection represents a collection of attributes

Use with: TagBeginCollection

func (*Collection) Add 

func (collection *Collection) Add(attr Attribute)

Add Attribute to Attributes

func (Collection) Equal 

func (c1 Collection) Equal(c2 Attributes) bool

Equal checks that two collections are equal

func (Collection) String 

func (v Collection) String() string

String() converts Collection to string

func (Collection) Type 

func (Collection) Type() Type

Type returns type of Value

type Integer 

type Integer int32

Integer represents an Integer Value

Use with: TagInteger, TagEnum

func (Integer) String 

func (v Integer) String() string

String() converts Integer value to string

func (Integer) Type 

func (Integer) Type() Type

Type returns type of Value

type Message 

type Message struct {
	// Common header
	Version   Version // Protocol version
	Code      Code    // Operation for request, status for response
	RequestID uint32  // Set in request, returned in response

	// Attributes, by group
	Operation         Attributes // Operation attributes
	Job               Attributes // Job attributes
	Printer           Attributes // Printer attributes
	Unsupported       Attributes // Unsupported attributes
	Subscription      Attributes // Subscription attributes
	EventNotification Attributes // Event Notification attributes
	Resource          Attributes // Resource attributes
	Document          Attributes // Document attributes
	System            Attributes // System attributes
	Future11          Attributes // \
	Future12          Attributes //  \
	Future13          Attributes //   | Reserved for future extensions
	Future14          Attributes //  /
	Future15          Attributes // /
}

Message represents a single IPP message, which may be either client request or server response

func NewRequest 

func NewRequest(v Version, op Op, id uint32) *Message

NewRequest creates a new request message

Use DefaultVersion as a first argument, if you don't have any specific needs

func NewResponse 

func NewResponse(v Version, status Status, id uint32) *Message

NewResponse creates a new response message

Use DefaultVersion as a first argument, if you don't

func (*Message) Decode 

func (m *Message) Decode(in io.Reader) error

Decode message

func (*Message) DecodeBytes 

func (m *Message) DecodeBytes(data []byte) error

DecodeBytes decodes message from byte slice

func (*Message) Encode 

func (m *Message) Encode(out io.Writer) error

Encode message

func (*Message) EncodeBytes 

func (m *Message) EncodeBytes() ([]byte, error)

EncodeBytes encodes message to byte slice

func (Message) Equal 

func (m Message) Equal(m2 Message) bool

Equal checks that two messages are equal

func (*Message) Print 

func (m *Message) Print(out io.Writer, request bool)

Print pretty-prints the message. The 'request' parameter affects interpretation of Message.Code: it is interpreted either as Op or as Status

func (*Message) Reset 

func (m *Message) Reset()

Reset the message into initial state

type Op 

type Op Code

Op represents an IPP Operation Code 

const (
	OpPrintJob             Op = 0x0002 // Print-Job: Print a single file
	OpPrintURI             Op = 0x0003 // Print-URI: Print a single URL
	OpValidateJob          Op = 0x0004 // Validate-Job: Validate job values prior to submission
	OpCreateJob            Op = 0x0005 // Create-Job: Create an empty print job
	OpSendDocument         Op = 0x0006 // Send-Document: Add a file to a job
	OpSendURI              Op = 0x0007 // Send-URI: Add a URL to a job
	OpCancelJob            Op = 0x0008 // Cancel-Job: Cancel a job
	OpGetJobAttributes     Op = 0x0009 // Get-Job-Attribute: Get information about a job
	OpGetJobs              Op = 0x000a // Get-Jobs: Get a list of jobs
	OpGetPrinterAttributes Op = 0x000b // Get-Printer-Attributes: Get information about a printer
	OpHoldJob              Op = 0x000c // Hold-Job: Hold a job for printing
	OpReleaseJob           Op = 0x000d // Release-Job: Release a job for printing
	OpRestartJob           Op = 0x000e // Restart-Job: Reprint a job

	OpPausePrinter               Op = 0x0010 // Pause-Printer: Stop a printer
	OpResumePrinter              Op = 0x0011 // Resume-Printer: Start a printer
	OpPurgeJobs                  Op = 0x0012 // Purge-Jobs: Delete all jobs
	OpSetPrinterAttributes       Op = 0x0013 // Set-Printer-Attributes: Set printer values
	OpSetJobAttributes           Op = 0x0014 // Set-Job-Attributes: Set job values
	OpGetPrinterSupportedValues  Op = 0x0015 // Get-Printer-Supported-Values: Get supported values
	OpCreatePrinterSubscriptions Op = 0x0016 // Create-Printer-Subscriptions: Create one or more printer subscriptions
	OpCreateJobSubscriptions     Op = 0x0017 // Create-Job-Subscriptions: Create one of more job subscriptions
	OpGetSubscriptionAttributes  Op = 0x0018 // Get-Subscription-Attributes: Get subscription information
	OpGetSubscriptions           Op = 0x0019 // Get-Subscriptions: Get list of subscriptions
	OpRenewSubscription          Op = 0x001a // Renew-Subscription: Renew a printer subscription
	OpCancelSubscription         Op = 0x001b // Cancel-Subscription: Cancel a subscription
	OpGetNotifications           Op = 0x001c // Get-Notifications: Get notification events
	OpSendNotifications          Op = 0x001d // Send-Notifications: Send notification events
	OpGetResourceAttributes      Op = 0x001e // Get-Resource-Attributes: Get resource information
	OpGetResourceData            Op = 0x001f // Get-Resource-Data: Get resource data

	OpGetResources                Op = 0x0020 // Get-Resources: Get list of resources
	OpGetPrintSupportFiles        Op = 0x0021 // Get-Printer-Support-Files: Get printer support files
	OpEnablePrinter               Op = 0x0022 // Enable-Printer: Accept new jobs for a printer
	OpDisablePrinter              Op = 0x0023 // Disable-Printer: Reject new jobs for a printer
	OpPausePrinterAfterCurrentJob Op = 0x0024 // Pause-Printer-After-Current-Job: Stop printer after the current job
	OpHoldNewJobs                 Op = 0x0025 // Hold-New-Jobs: Hold new jobs
	OpReleaseHeldNewJobs          Op = 0x0026 // Release-Held-New-Jobs: Release new jobs that were previously held
	OpDeactivatePrinter           Op = 0x0027 // Deactivate-Printer: Stop a printer and do not accept jobs
	OpActivatePrinter             Op = 0x0028 // Activate-Printer: Start a printer and accept jobs
	OpRestartPrinter              Op = 0x0029 // Restart-Printer: Restart a printer
	OpShutdownPrinter             Op = 0x002a // Shutdown-Printer: Turn a printer off
	OpStartupPrinter              Op = 0x002b // Startup-Printer: Turn a printer on
	OpReprocessJob                Op = 0x002c // Reprocess-Job: Reprint a job
	OpCancelCurrentJob            Op = 0x002d // Cancel-Current-Job: Cancel the current job
	OpSuspendCurrentJob           Op = 0x002e // Suspend-Current-Job: Suspend the current job
	OpResumeJob                   Op = 0x002f // Resume-Job: Resume the current job

	OpPromoteJob            Op = 0x0030 // Promote-Job: Promote a job to print sooner
	OpScheduleJobAfter      Op = 0x0031 // Schedule-Job-After: Schedule a job to print after another
	OpCancelDocument        Op = 0x0033 // Cancel-Document: Cancel a document
	OpGetDocumentAttributes Op = 0x0034 // Get-Document-Attributes: Get document information
	OpGetDocuments          Op = 0x0035 // Get-Documents: Get a list of documents in a job
	OpDeleteDocument        Op = 0x0036 // Delete-Document: Delete a document
	OpSetDocumentAttributes Op = 0x0037 // Set-Document-Attributes: Set document values
	OpCancelJobs            Op = 0x0038 // Cancel-Jobs: Cancel all jobs (administrative)
	OpCancelMyJobs          Op = 0x0039 // Cancel-My-Jobs: Cancel a user's jobs
	OpResubmitJob           Op = 0x003a // Resubmit-Job: Copy and reprint a job
	OpCloseJob              Op = 0x003b // Close-Job: Close a job and start printing
	OpIdentifyPrinter       Op = 0x003c // Identify-Printer: Make the printer beep, flash, or display a message for identification
	OpValidateDocument      Op = 0x003d // Validate-Document: Validate document values prior to submission
	OpAddDocumentImages     Op = 0x003e // Add-Document-Images: Add image(s) from the specified scanner source
	OpAcknowledgeDocument   Op = 0x003f // Acknowledge-Document: Acknowledge processing of a document

	OpAcknowledgeIdentifyPrinter   Op = 0x0040 // Acknowledge-Identify-Printer: Acknowledge action on an Identify-Printer request
	OpAcknowledgeJob               Op = 0x0041 // Acknowledge-Job: Acknowledge processing of a job
	OpFetchDocument                Op = 0x0042 // Fetch-Document: Fetch a document for processing
	OpFetchJob                     Op = 0x0043 // Fetch-Job: Fetch a job for processing
	OpGetOutputDeviceAttributes    Op = 0x0044 // Get-Output-Device-Attributes: Get printer information for a specific output device
	OpUpdateActiveJobs             Op = 0x0045 // Update-Active-Jobs: Update the list of active jobs that a proxy has processed
	OpDeregisterOutputDevice       Op = 0x0046 // Deregister-Output-Device: Remove an output device
	OpUpdateDocumentStatus         Op = 0x0047 // Update-Document-Status: Update document values
	OpUpdateJobStatus              Op = 0x0048 // Update-Job-Status: Update job values
	OpupdateOutputDeviceAttributes Op = 0x0049 // Update-Output-Device-Attributes: Update output device values
	OpGetNextDocumentData          Op = 0x004a // Get-Next-Document-Data: Scan more document data
	OpAllocatePrinterResources     Op = 0x004b // Allocate-Printer-Resources: Use resources for a printer
	OpCreatePrinter                Op = 0x004c // Create-Printer: Create a new service
	OpDeallocatePrinterResources   Op = 0x004d // Deallocate-Printer-Resources: Stop using resources for a printer
	OpDeletePrinter                Op = 0x004e // Delete-Printer: Delete an existing service
	OpGetPrinters                  Op = 0x004f // Get-Printers: Get a list of services

	OpShutdownOnePrinter              Op = 0x0050 // Shutdown-One-Printer: Shutdown a service
	OpStartupOnePrinter               Op = 0x0051 // Startup-One-Printer: Start a service
	OpCancelResource                  Op = 0x0052 // Cancel-Resource: Uninstall a resource
	OpCreateResource                  Op = 0x0053 // Create-Resource: Create a new (empty) resource
	OpInstallResource                 Op = 0x0054 // Install-Resource: Install a resource
	OpSendResourceData                Op = 0x0055 // Send-Resource-Data: Upload the data for a resource
	OpSetResourceAttributes           Op = 0x0056 // Set-Resource-Attributes: Set resource object  attributes
	OpCreateResourceSubscriptions     Op = 0x0057 // Create-Resource-Subscriptions: Create event subscriptions for a resource
	OpCreateSystemSubscriptions       Op = 0x0058 // Create-System-Subscriptions: Create event subscriptions for a system
	OpDisableAllPrinters              Op = 0x0059 // Disable-All-Printers: Stop accepting new jobs on all services
	OpEnableAllPrinters               Op = 0x005a // Enable-All-Printers: Start accepting new jobs on all services
	OpGetSystemAttributes             Op = 0x005b // Get-System-Attributes: Get system object attributes
	OpGetSystemSupportedValues        Op = 0x005c // Get-System-Supported-Values: Get supported values for system object attributes
	OpPauseAllPrinters                Op = 0x005d // Pause-All-Printers: Stop all services immediately
	OpPauseAllPrintersAfterCurrentJob Op = 0x005e // Pause-All-Printers-After-Current-Job: Stop all services after processing the current jobs
	OpRegisterOutputDevice            Op = 0x005f // Register-Output-Device: Register a remote service

	OpRestartSystem       Op = 0x0060 // Restart-System: Restart all services
	OpResumeAllPrinters   Op = 0x0061 // Resume-All-Printers: Start job processing on all services
	OpSetSystemAttributes Op = 0x0062 // Set-System-Attributes: Set system object attributes
	OpShutdownAllPrinters Op = 0x0063 // Shutdown-All-Printers: Shutdown all services
	OpStartupAllPrinters  Op = 0x0064 // Startup-All-Printers: Startup all services

	OpCupsGetDefault       Op = 0x4001 // CUPS-Get-Default: Get the default printer
	OpCupsGetPrinters      Op = 0x4002 // CUPS-Get-Printers: Get a list of printers and/or classes
	OpCupsAddModifyPrinter Op = 0x4003 // CUPS-Add-Modify-Printer: Add or modify a printer
	OpCupsDeletePrinter    Op = 0x4004 // CUPS-Delete-Printer: Delete a printer
	OpCupsGetClasses       Op = 0x4005 // CUPS-Get-Classes: Get a list of classes
	OpCupsAddModifyClass   Op = 0x4006 // CUPS-Add-Modify-Class: Add or modify a class
	OpCupsDeleteClass      Op = 0x4007 // CUPS-Delete-Class: Delete a class
	OpCupsAcceptJobs       Op = 0x4008 // CUPS-Accept-Jobs: Accept new jobs on a printer
	OpCupsRejectJobs       Op = 0x4009 // CUPS-Reject-Jobs: Reject new jobs on a printer
	OpCupsSetDefault       Op = 0x400a // CUPS-Set-Default: Set the default printer
	OpCupsGetDevices       Op = 0x400b // CUPS-Get-Devices: Get a list of supported devices
	OpCupsGetPpds          Op = 0x400c // CUPS-Get-PPDs: Get a list of supported drivers
	OpCupsMoveJob          Op = 0x400d // CUPS-Move-Job: Move a job to a different printer
	OpCupsAuthenticateJob  Op = 0x400e // CUPS-Authenticate-Job: Authenticate a job
	OpCupsGetPpd           Op = 0x400f // CUPS-Get-PPD: Get a PPD file

	OpCupsGetDocument        Op = 0x4027 // CUPS-Get-Document: Get a document file
	OpCupsCreateLocalPrinter Op = 0x4028 // CUPS-Create-Local-Printer: Create a local (temporary) printer

)

func (Op) String 

func (op Op) String() string

String() returns a Status name, as defined by RFC 8010

type Range 

type Range struct {
	Lower, Upper int // Lower/upper bounds
}

Range represents a range of integers Value

Use with: TagRange

func (Range) String 

func (v Range) String() string

String() converts Range value to string

func (Range) Type 

func (Range) Type() Type

Type returns type of Value

type Resolution 

type Resolution struct {
	Xres, Yres int   // X/Y resolutions
	Units      Units // Resolution units
}

Resolution represents a resolution Value

Use with: TagResolution

func (Resolution) String 

func (v Resolution) String() string

String() converts Resolution value to string

func (Resolution) Type 

func (Resolution) Type() Type

Type returns type of Value

type Status 

type Status Code

Status represents an IPP Status Code 

const (
	StatusOk                              Status = 0x0000 // successful-ok
	StatusOkIgnoredOrSubstituted          Status = 0x0001 // successful-ok-ignored-or-substituted-attributes
	StatusOkConflicting                   Status = 0x0002 // successful-ok-conflicting-attributes
	StatusOkIgnoredSubscriptions          Status = 0x0003 // successful-ok-ignored-subscriptions
	StatusOkIgnoredNotifications          Status = 0x0004 // successful-ok-ignored-notifications
	StatusOkTooManyEvents                 Status = 0x0005 // successful-ok-too-many-events
	StatusOkButCancelSubscription         Status = 0x0006 // successful-ok-but-cancel-subscription
	StatusOkEventsComplete                Status = 0x0007 // successful-ok-events-complete
	StatusRedirectionOtherSite            Status = 0x0200 // redirection-other-site
	StatusCupsSeeOther                    Status = 0x0280 // cups-see-other
	StatusErrorBadRequest                 Status = 0x0400 // client-error-bad-request
	StatusErrorForbidden                  Status = 0x0401 // client-error-forbidden
	StatusErrorNotAuthenticated           Status = 0x0402 // client-error-not-authenticated
	StatusErrorNotAuthorized              Status = 0x0403 // client-error-not-authorized
	StatusErrorNotPossible                Status = 0x0404 // client-error-not-possible
	StatusErrorTimeout                    Status = 0x0405 // client-error-timeout
	StatusErrorNotFound                   Status = 0x0406 // client-error-not-found
	StatusErrorGone                       Status = 0x0407 // client-error-gone
	StatusErrorRequestEntity              Status = 0x0408 // client-error-request-entity-too-large
	StatusErrorRequestValue               Status = 0x0409 // client-error-request-value-too-long
	StatusErrorDocumentFormatNotSupported Status = 0x040a // client-error-document-format-not-supported
	StatusErrorAttributesOrValues         Status = 0x040b // client-error-attributes-or-values-not-supported
	StatusErrorURIScheme                  Status = 0x040c // client-error-uri-scheme-not-supported
	StatusErrorCharset                    Status = 0x040d // client-error-charset-not-supported
	StatusErrorConflicting                Status = 0x040e // client-error-conflicting-attributes
	StatusErrorCompressionNotSupported    Status = 0x040f // client-error-compression-not-supported
	StatusErrorCompressionError           Status = 0x0410 // client-error-compression-error
	StatusErrorDocumentFormatError        Status = 0x0411 // client-error-document-format-error
	StatusErrorDocumentAccess             Status = 0x0412 // client-error-document-access-error
	StatusErrorAttributesNotSettable      Status = 0x0413 // client-error-attributes-not-settable
	StatusErrorIgnoredAllSubscriptions    Status = 0x0414 // client-error-ignored-all-subscriptions
	StatusErrorTooManySubscriptions       Status = 0x0415 // client-error-too-many-subscriptions
	StatusErrorIgnoredAllNotifications    Status = 0x0416 // client-error-ignored-all-notifications
	StatusErrorPrintSupportFileNotFound   Status = 0x0417 // client-error-print-support-file-not-found
	StatusErrorDocumentPassword           Status = 0x0418 // client-error-document-password-error
	StatusErrorDocumentPermission         Status = 0x0419 // client-error-document-permission-error
	StatusErrorDocumentSecurity           Status = 0x041a // client-error-document-security-error
	StatusErrorDocumentUnprintable        Status = 0x041b // client-error-document-unprintable-error
	StatusErrorAccountInfoNeeded          Status = 0x041c // client-error-account-info-needed
	StatusErrorAccountClosed              Status = 0x041d // client-error-account-closed
	StatusErrorAccountLimitReached        Status = 0x041e // client-error-account-limit-reached
	StatusErrorAccountAuthorizationFailed Status = 0x041f // client-error-account-authorization-failed
	StatusErrorNotFetchable               Status = 0x0420 // client-error-not-fetchable
	StatusErrorInternal                   Status = 0x0500 // server-error-internal-error
	StatusErrorOperationNotSupported      Status = 0x0501 // server-error-operation-not-supported
	StatusErrorServiceUnavailable         Status = 0x0502 // server-error-service-unavailable
	StatusErrorVersionNotSupported        Status = 0x0503 // server-error-version-not-supported
	StatusErrorDevice                     Status = 0x0504 // server-error-device-error
	StatusErrorTemporary                  Status = 0x0505 // server-error-temporary-error
	StatusErrorNotAcceptingJobs           Status = 0x0506 // server-error-not-accepting-jobs
	StatusErrorBusy                       Status = 0x0507 // server-error-busy
	StatusErrorJobCanceled                Status = 0x0508 // server-error-job-canceled
	StatusErrorMultipleJobsNotSupported   Status = 0x0509 // server-error-multiple-document-jobs-not-supported
	StatusErrorPrinterIsDeactivated       Status = 0x050a // server-error-printer-is-deactivated
	StatusErrorTooManyJobs                Status = 0x050b // server-error-too-many-jobs
	StatusErrorTooManyDocuments           Status = 0x050c // server-error-too-many-documents
)

func (Status) String 

func (s Status) String() string

String() returns a Status name, as defined by RFC 8010

type String 

type String string

String represents a string Value

Use with: TagText, TagName, TagReservedString, TagKeyword, TagURI, TagURIScheme, TagCharset, TagLanguage, TagMimeType, TagMemberName

func (String) String 

func (v String) String() string

String() converts String value to string

func (String) Type 

func (String) Type() Type

Type returns type of Value

type Tag 

type Tag int

Tag represents a tag used in a binary representation of the IPP message 

const (
	// Delimiter tags
	TagZero                   Tag = 0x00 // Zero tag - used for separators
	TagOperationGroup         Tag = 0x01 // Operation group
	TagJobGroup               Tag = 0x02 // Job group
	TagEnd                    Tag = 0x03 // End-of-attributes
	TagPrinterGroup           Tag = 0x04 // Printer group
	TagUnsupportedGroup       Tag = 0x05 // Unsupported attributes group
	TagSubscriptionGroup      Tag = 0x06 // Subscription group
	TagEventNotificationGroup Tag = 0x07 // Event group
	TagResourceGroup          Tag = 0x08 // Resource group
	TagDocumentGroup          Tag = 0x09 // Document group
	TagSystemGroup            Tag = 0x0a // System group
	TagFuture11Group          Tag = 0x0b // Future group 11
	TagFuture12Group          Tag = 0x0c // Future group 11
	TagFuture13Group          Tag = 0x0d // Future group 11
	TagFuture14Group          Tag = 0x0e // Future group 11
	TagFuture15Group          Tag = 0x0f // Future group 11

	// Value tags
	TagUnsupportedValue Tag = 0x10 // Unsupported value
	TagDefault          Tag = 0x11 // Default value
	TagUnknown          Tag = 0x12 // Unknown value
	TagNoValue          Tag = 0x13 // No-value value
	TagNotSettable      Tag = 0x15 // Not-settable value
	TagDeleteAttr       Tag = 0x16 // Delete-attribute value
	TagAdminDefine      Tag = 0x17 // Admin-defined value
	TagInteger          Tag = 0x21 // Integer value
	TagBoolean          Tag = 0x22 // Boolean value
	TagEnum             Tag = 0x23 // Enumeration value
	TagString           Tag = 0x30 // Octet string value
	TagDateTime         Tag = 0x31 // Date/time value
	TagResolution       Tag = 0x32 // Resolution value
	TagRange            Tag = 0x33 // Range value
	TagBeginCollection  Tag = 0x34 // Beginning of collection value
	TagTextLang         Tag = 0x35 // Text-with-language value
	TagNameLang         Tag = 0x36 // Name-with-language value
	TagEndCollection    Tag = 0x37 // End of collection value
	TagText             Tag = 0x41 // Text value
	TagName             Tag = 0x42 // Name value
	TagReservedString   Tag = 0x43 // Reserved for future string value
	TagKeyword          Tag = 0x44 // Keyword value
	TagURI              Tag = 0x45 // URI value
	TagURIScheme        Tag = 0x46 // URI scheme value
	TagCharset          Tag = 0x47 // Character set value
	TagLanguage         Tag = 0x48 // Language value
	TagMimeType         Tag = 0x49 // MIME media type value
	TagMemberName       Tag = 0x4a // Collection member name value
	TagExtension        Tag = 0x7f // Extension point for 32-bit tags
)

func (Tag) IsDelimiter 

func (tag Tag) IsDelimiter() bool

IsDelimiter returns true for delimiter tags

func (Tag) String 

func (tag Tag) String() string

String() returns a tag name, as defined by RFC 8010

func (Tag) Type 

func (tag Tag) Type() Type

Type returns Type of Value that corresponds to the tag

type TextWithLang 

type TextWithLang struct {
	Lang, Text string // Language and text
}

TextWithLang represents a combination of two strings: one is a name of natural language and second is a text on this language

Use with: TagTextLang, TagNameLang

func (TextWithLang) String 

func (v TextWithLang) String() string

String() converts TextWithLang value to string

func (TextWithLang) Type 

func (TextWithLang) Type() Type

Type returns type of Value

type Time 

type Time struct{ time.Time }

Time represents a DateTime Value

Use with: TagTime

func (Time) String 

func (v Time) String() string

String() converts Time value to string

func (Time) Type 

func (Time) Type() Type

Type returns type of Value

type Type 

type Type int

Type enumerates all possible value types 

const (
	TypeInvalid Type = -1
	TypeVoid    Type = iota
	TypeInteger
	TypeBoolean
	TypeString
	TypeDateTime
	TypeResolution
	TypeRange
	TypeTextWithLang
	TypeBinary
	TypeCollection
)

func (Type) String 

func (t Type) String() string

String converts Type to string, for debugging

type Units 

type Units uint8

Units represents resolution units 

const (
	UnitsDpi  Units = 3 // Dots per inch
	UnitsDpcm Units = 4 // Dots per cm
)

func (Units) String 

func (u Units) String() string

String() converts Units to string

type Value 

type Value interface {
	String() string
	Type() Type
	// contains filtered or unexported methods
}

Value represents an attribute value

type Values 

type Values []struct {
	T Tag   // The tag
	V Value // The value
}

Values represents a slice of Attribute values with tags

func (*Values) Add 

func (values *Values) Add(t Tag, v Value)

Add value to Values

func (Values) Equal 

func (values Values) Equal(values2 Values) bool

Equal checks that two Values are equal

func (Values) String 

func (values Values) String() string

String() converts Values to string

type Version 

type Version uint16

Version represents a protocol version. It consist of Major and Minor version codes, packed into a single 16-bit word 

const DefaultVersion Version = 0x0200

DefaultVersion is the default IPP version

func MakeVersion 

func MakeVersion(major, minor uint8) Version

MakeVersion makes version from major and minor parts

func (Version) Major 

func (v Version) Major() uint8

Major returns a major part of version

func (Version) Minor 

func (v Version) Minor() uint8

Minor returns a minor part of version

func (Version) String 

func (v Version) String() string

String() converts version to string (i.e., 2.0)

type Void 

type Void struct{}

Void represents "no value"

Use with: TagUnsupportedValue, TagDefault, TagUnknown, TagNotSettable, TagDeleteAttr, TagAdminDefine

func (Void) String 

func (Void) String() string

String() converts Void Value to string

func (Void) Type 

func (Void) Type() Type

Type returns type of Value

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