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Copy pathattribute_encoder.go
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537 lines (453 loc) · 11.6 KB
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package ipp
import (
"encoding/binary"
"fmt"
"io"
)
// AttributeEncoder encodes attribute to a io.Writer
type AttributeEncoder struct {
writer io.Writer
}
// NewAttributeEncoder returns a new encoder that writes to w
func NewAttributeEncoder(w io.Writer) *AttributeEncoder {
return &AttributeEncoder{w}
}
// Encode encodes a attribute and its value to a io.Writer
// the tag is determined by the AttributeTagMapping map
func (e *AttributeEncoder) Encode(attribute string, value any) error {
tag, ok := AttributeTagMapping[attribute]
if !ok {
return fmt.Errorf("cannot get tag of attribute %s", attribute)
}
switch v := value.(type) {
case int:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeInteger(int32(v)); err != nil {
return err
}
case int16:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeInteger(int32(v)); err != nil {
return err
}
case int8:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeInteger(int32(v)); err != nil {
return err
}
case int32:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeInteger(v); err != nil {
return err
}
case int64:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeInteger(int32(v)); err != nil {
return err
}
case []int:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeInteger(int32(val)); err != nil {
return err
}
}
case []int16:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeInteger(int32(val)); err != nil {
return err
}
}
case []int8:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeInteger(int32(val)); err != nil {
return err
}
}
case []int32:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeInteger(val); err != nil {
return err
}
}
case []int64:
if tag != TagInteger && tag != TagEnum {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeInteger(int32(val)); err != nil {
return err
}
}
case bool:
if tag != TagBoolean {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeBoolean(v); err != nil {
return err
}
case []bool:
if tag != TagBoolean {
return fmt.Errorf("tag for attribute %s does not match with value type", attribute)
}
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeBoolean(val); err != nil {
return err
}
}
case string:
if err := e.encodeTag(tag); err != nil {
return err
}
if err := e.encodeString(attribute); err != nil {
return err
}
if err := e.encodeString(v); err != nil {
return err
}
case []string:
for index, val := range v {
if err := e.encodeTag(tag); err != nil {
return err
}
if index == 0 {
if err := e.encodeString(attribute); err != nil {
return err
}
} else {
if err := e.writeNullByte(); err != nil {
return err
}
}
if err := e.encodeString(val); err != nil {
return err
}
}
case Collection:
if err := e.encodeCollection(attribute, v); err != nil {
return err
}
case []Collection:
for index, col := range v {
if index == 0 {
if err := e.encodeCollection(attribute, col); err != nil {
return err
}
} else {
if err := e.encodeAdditionalCollection(col); err != nil {
return err
}
}
}
default:
return fmt.Errorf("type %T is not supported", value)
}
return nil
}
func (e *AttributeEncoder) encodeString(s string) error {
if err := binary.Write(e.writer, binary.BigEndian, int16(len(s))); err != nil {
return err
}
_, err := e.writer.Write([]byte(s))
return err
}
const sizeInteger = int16(4)
func (e *AttributeEncoder) encodeInteger(i int32) error {
if err := binary.Write(e.writer, binary.BigEndian, sizeInteger); err != nil {
return err
}
return binary.Write(e.writer, binary.BigEndian, i)
}
const sizeBoolean = int16(1)
func (e *AttributeEncoder) encodeBoolean(b bool) error {
if err := binary.Write(e.writer, binary.BigEndian, sizeBoolean); err != nil {
return err
}
return binary.Write(e.writer, binary.BigEndian, b)
}
func (e *AttributeEncoder) encodeTag(t int8) error {
return binary.Write(e.writer, binary.BigEndian, t)
}
func (e *AttributeEncoder) writeNullByte() error {
return binary.Write(e.writer, binary.BigEndian, int16(0))
}
func (e *AttributeEncoder) encodeCollection(name string, col Collection) error {
// Write beginCollection tag
if err := e.encodeTag(TagBeginCollection); err != nil {
return err
}
// Write attribute name
if err := e.encodeString(name); err != nil {
return err
}
// Write value length (0 for beginCollection)
if err := e.writeNullByte(); err != nil {
return err
}
// Encode each member attribute
for memberName, attrs := range col {
if err := e.encodeMemberAttributes(memberName, attrs); err != nil {
return err
}
}
// Write endCollection tag
if err := e.encodeTag(TagEndCollection); err != nil {
return err
}
// Write empty name length
if err := e.writeNullByte(); err != nil {
return err
}
// Write value length (0 for endCollection)
if err := e.writeNullByte(); err != nil {
return err
}
return nil
}
func (e *AttributeEncoder) encodeAdditionalCollection(col Collection) error {
// Write beginCollection tag for additional collection value
if err := e.encodeTag(TagBeginCollection); err != nil {
return err
}
// Write empty name length (for additional values)
if err := e.writeNullByte(); err != nil {
return err
}
// Write value length (0 for beginCollection)
if err := e.writeNullByte(); err != nil {
return err
}
// Encode each member attribute
for memberName, attrs := range col {
if err := e.encodeMemberAttributes(memberName, attrs); err != nil {
return err
}
}
// Write endCollection tag
if err := e.encodeTag(TagEndCollection); err != nil {
return err
}
// Write empty name length
if err := e.writeNullByte(); err != nil {
return err
}
// Write value length (0 for endCollection)
if err := e.writeNullByte(); err != nil {
return err
}
return nil
}
func (e *AttributeEncoder) encodeMemberAttributes(memberName string, attrs []Attribute) error {
for _, attr := range attrs {
// Write memberName tag
if err := e.encodeTag(TagMemberName); err != nil {
return err
}
// Write name length (0 for memberName tag per RFC 3382 Section 7.1)
if err := e.writeNullByte(); err != nil {
return err
}
// Write value length (length of member name)
if err := binary.Write(e.writer, binary.BigEndian, int16(len(memberName))); err != nil {
return err
}
// Write member name as the value
if _, err := e.writer.Write([]byte(memberName)); err != nil {
return err
}
// Write the actual value tag
if err := e.encodeTag(attr.Tag); err != nil {
return err
}
// Write empty name length (the name is in the memberName tag)
if err := e.writeNullByte(); err != nil {
return err
}
// Encode the value based on its type
switch attr.Tag {
case TagEnum, TagInteger:
// Handle both int and int32 types
var intVal int32
switch v := attr.Value.(type) {
case int32:
intVal = v
case int:
intVal = int32(v)
default:
return fmt.Errorf("integer attribute has unsupported type %T", attr.Value)
}
if err := e.encodeInteger(intVal); err != nil {
return err
}
case TagBoolean:
if err := e.encodeBoolean(attr.Value.(bool)); err != nil {
return err
}
case TagBeginCollection:
// For nested collections, we need to handle them specially
if col, ok := attr.Value.(Collection); ok {
// Write value length (0 for beginCollection)
if err := e.writeNullByte(); err != nil {
return err
}
// Encode the nested collection members
for nestedMemberName, nestedAttrs := range col {
if err := e.encodeMemberAttributes(nestedMemberName, nestedAttrs); err != nil {
return err
}
}
// Write endCollection tag for nested collection
if err := e.encodeTag(TagEndCollection); err != nil {
return err
}
// Write empty name length
if err := e.writeNullByte(); err != nil {
return err
}
// Write value length (0 for endCollection)
if err := e.writeNullByte(); err != nil {
return err
}
}
default:
// For strings and other types
if str, ok := attr.Value.(string); ok {
if err := e.encodeString(str); err != nil {
return err
}
} else {
return fmt.Errorf("unsupported member attribute value type: %T", attr.Value)
}
}
}
return nil
}