Simple roundtrip from ipptool works.
This commit is contained in:
252
packages/ipp/messages.go
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252
packages/ipp/messages.go
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@@ -0,0 +1,252 @@
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package ipp
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import (
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"encoding/binary"
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"fmt"
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"io"
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log "github.com/sirupsen/logrus"
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)
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// References
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// https://tools.ietf.org/html/rfc8010
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// https://tools.ietf.org/html/rfc8011
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// Defined value tags
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// from rfc8010
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type tag uint8
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const (
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// attribute group tags
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beginAttribute tag = 0x00
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operationAttributes tag = 0x01
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jobAttributes tag = 0x02
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endOfAttributes tag = 0x03
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printerAttributes tag = 0x04
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unsupportedAttributes tag = 0x05
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// Out of band
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unsupportedValueTag tag = 0x10
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unknownValueTag tag = 0x12
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noValueValueTag tag = 0x13
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// Integer values
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integerValueTag tag = 0x21
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booleanValueTag tag = 0x22
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enumValueTag tag = 0x23
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// octetString Tags
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octetStringValueTag tag = 0x30
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dateTimeValueTag tag = 0x31
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resolutionValueTag tag = 0x32
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rangeOfIntegerValueTag tag = 0x33
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begCollectionValueTag tag = 0x34
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textWithLanguageValueTag tag = 0x35
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nameWithLanguageValueTag tag = 0x36
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endCollectionValueTag tag = 0x37
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// Character string values
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textWithoutLanguagageValueTag tag = 0x41
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nameWithoutLanguagageValueTag tag = 0x42
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keyWordValueTag tag = 0x44
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uriValueTag tag = 0x45
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uriSchemeValueTag tag = 0x46
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charsetValueTag tag = 0x47
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naturalLanguagageValueTag tag = 0x48
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mimeMediaTypeValueTag tag = 0x49
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memberAttrNameValueTag tag = 0x4a
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)
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// Operation-id, defined in rfc8011
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type operationId uint16
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const (
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PrintJob operationId = 0x0002
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PrintURI operationId = 0x0003
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ValidateJob operationId = 0x0004
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CreateJob operationId = 0x0005
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SendDocument operationId = 0x0006
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SendURI operationId = 0x0007
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CancelJob operationId = 0x0008
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GetJobAttributes operationId = 0x0009
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GetJobs operationId = 0x000a
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GetPrinterAttributes operationId = 0x000b
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HoldJob operationId = 0x000c
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ReleaseJob operationId = 0x000d
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RestartJob operationId = 0x000e
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PausePrinter operationId = 0x0010
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ResumePrinter operationId = 0x0011
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PurgeJobs operationId = 0x0012
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)
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type statusCode uint16
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const (
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SuccessfulOk statusCode = 0x0000
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ClientErrorBadRequest statusCode = 0x0400
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)
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type versionNumber uint16
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func (v versionNumber) String() string {
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vn := uint16(v)
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return fmt.Sprintf("%x.%x", vn&0xff00>>8, vn&0x00ff)
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}
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type ippRequestHeader struct {
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versionNumber versionNumber
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operationId operationId
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requestId uint32
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}
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func (h *ippRequestHeader) marshal(byteStream io.Reader) {
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binary.Read(byteStream, binary.BigEndian, &h.versionNumber)
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binary.Read(byteStream, binary.BigEndian, &h.operationId)
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binary.Read(byteStream, binary.BigEndian, &h.requestId)
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}
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func (h ippRequestHeader) String() string {
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return fmt.Sprintf("Version number: %v Operation Id: %v Request Id: %v", h.versionNumber, h.operationId, h.requestId)
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}
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type Attribute interface {
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valueTag() tag
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unmarshal(io.Reader)
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marshal() []byte
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size() int
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}
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type Request struct {
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header ippRequestHeader
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operationAttributes map[string]Attribute
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jobAttributes map[string]Attribute
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printerAttributes map[string]Attribute
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}
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func NewRequest() *Request {
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r := new(Request)
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r.operationAttributes = make(map[string]Attribute)
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r.jobAttributes = make(map[string]Attribute)
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r.printerAttributes = make(map[string]Attribute)
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return r
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}
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func (r Request) String() string {
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s := r.header.String() + "\n" + " OperationAttributes" + "\n"
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for _, a := range r.operationAttributes {
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s = s + fmt.Sprintf(" %v (%v)\n", a, a.valueTag())
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}
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return s
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}
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// log.Info(r.Header)
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// log.Info(r.ContentLength)
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//body := make([]byte, r.ContentLength)
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//body.Read(body)
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func (r *Request) UnMarshal(body io.Reader) {
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r.header.marshal(body)
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log.Infof("Header %v", r.header)
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var tag tag
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err := binary.Read(body, binary.BigEndian, &tag)
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if err != nil {
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log.Error(err.Error())
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}
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log.Infof("got tag - %v", tag)
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if tag == operationAttributes {
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nextoperationattr:
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for tag != endOfAttributes {
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var lastKeyword *keyWord
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err = binary.Read(body, binary.BigEndian, &tag)
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if err != nil {
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log.Error(err.Error())
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}
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log.Infof("Value tag - %v", tag)
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switch tag {
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case endOfAttributes:
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err = binary.Read(body, binary.BigEndian, &tag)
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if err == io.EOF {
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// No more data
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return
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}
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if err != nil {
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log.Error(err.Error())
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}
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log.Infof("got tag - %v", tag)
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err = binary.Read(body, binary.BigEndian, &tag)
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if err != nil {
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log.Error(err.Error())
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}
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log.Infof("got tag - %v", tag)
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break nextoperationattr
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case charsetValueTag:
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c := NewCharSetValue("", "")
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c.unmarshal(body)
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r.operationAttributes[c.name] = c
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log.Infof("%v %v", c.name, c.value)
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case uriValueTag:
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u := newUriValue("", "")
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u.unmarshal(body)
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r.operationAttributes[u.name] = u
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log.Infof("%v %v", u.name, u.value)
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case naturalLanguagageValueTag:
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n := newNaturalLanguagage("", "")
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n.unmarshal(body)
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r.operationAttributes[n.name] = n
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log.Infof("%v %v", n.name, n.value)
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case keyWordValueTag:
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k := newKeyWord()
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k.unmarshal(body)
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r.operationAttributes[k.name] = k
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if k.name == "" {
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lastKeyword.addValue(k.values[0])
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} else {
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lastKeyword = k
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}
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default:
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log.Errorf("Unsupported tag %v", tag)
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}
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}
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log.Infof("Value tag %v", tag)
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} else {
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log.Error("unexpected tag")
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// TODO Return something sensible here
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}
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}
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func (r *Request) RequestId() uint32 {
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return r.header.requestId
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}
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func unmarshalSingleValue(byteStream io.Reader) (string, string) {
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var length uint16
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binary.Read(byteStream, binary.BigEndian, &length)
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//log.Infof("Length %v", length)
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attributeName := make([]byte, length)
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if length > 0 {
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binary.Read(byteStream, binary.BigEndian, attributeName)
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//log.Infof("Valuename %v", string(attributeName))
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}
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binary.Read(byteStream, binary.BigEndian, &length)
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//log.Infof("Length %v", length)
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attributeValue := make([]byte, length)
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binary.Read(byteStream, binary.BigEndian, attributeValue)
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//log.Infof("Value %v", string(attributeValue))
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return string(attributeName), string(attributeValue)
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}
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func marshalNameValue(name, value string, b []byte) {
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p := 0
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binary.BigEndian.PutUint16(b[p:p+2], uint16(len(name)))
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p += 2
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copy(b[p:], []byte(name))
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p += len(name)
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binary.BigEndian.PutUint16(b[p:p+2], uint16(len(value)))
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p += 2
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copy(b[p:], []byte(value))
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}
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