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node.go
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node.go
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package binres
// NodeHeader is header all xml node types have, providing additional
// information regarding an xml node over binChunkHeader.
type NodeHeader struct {
chunkHeader
LineNumber uint32 // line number in source file this element appears
Comment PoolRef // optional xml comment associated with element, MaxUint32 if none
}
// UnmarshalBinary creates a node header from binary data
func (hdr *NodeHeader) UnmarshalBinary(bin []byte) error {
if err := (&hdr.chunkHeader).UnmarshalBinary(bin); err != nil {
return err
}
hdr.LineNumber = btou32(bin[8:])
hdr.Comment = PoolRef(btou32(bin[12:]))
return nil
}
// MarshalBinary outputs the binary format from a given header
func (hdr *NodeHeader) MarshalBinary() ([]byte, error) {
bin := make([]byte, 16)
b, err := hdr.chunkHeader.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin, b)
putu32(bin[8:], hdr.LineNumber)
putu32(bin[12:], uint32(hdr.Comment))
return bin, nil
}
// Namespace represents an XML namespace
type Namespace struct {
NodeHeader
prefix PoolRef
uri PoolRef
end *Namespace // TODO don't let this type be recursive
}
// UnmarshalBinary creates a namespace from binary data
func (ns *Namespace) UnmarshalBinary(bin []byte) error {
if err := (&ns.NodeHeader).UnmarshalBinary(bin); err != nil {
return err
}
buf := bin[ns.headerByteSize:]
ns.prefix = PoolRef(btou32(buf))
ns.uri = PoolRef(btou32(buf[4:]))
return nil
}
// MarshalBinary outputs the binary format from a given namespace
func (ns *Namespace) MarshalBinary() ([]byte, error) {
if ns.end == nil {
ns.typ = ResXMLEndNamespace
} else {
ns.typ = ResXMLStartNamespace
}
ns.headerByteSize = 16
ns.byteSize = 24
bin := make([]byte, ns.byteSize)
b, err := ns.NodeHeader.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin, b)
putu32(bin[16:], uint32(ns.prefix))
putu32(bin[20:], uint32(ns.uri))
return bin, nil
}
// Element represents an XML element
type Element struct {
NodeHeader
NS PoolRef
Name PoolRef // name of node if element, otherwise chardata if CDATA
AttributeStart uint16 // byte offset where attrs start
AttributeSize uint16 // byte size of attrs
AttributeCount uint16 // length of attrs
IDIndex uint16 // Index (1-based) of the "id" attribute. 0 if none.
ClassIndex uint16 // Index (1-based) of the "class" attribute. 0 if none.
StyleIndex uint16 // Index (1-based) of the "style" attribute. 0 if none.
attrs []*Attribute
Children []*Element
end *ElementEnd
head, tail *CharData
}
// UnmarshalBinary creates an element from binary data
func (el *Element) UnmarshalBinary(buf []byte) error {
if err := (&el.NodeHeader).UnmarshalBinary(buf); err != nil {
return err
}
buf = buf[el.headerByteSize:]
el.NS = PoolRef(btou32(buf))
el.Name = PoolRef(btou32(buf[4:]))
el.AttributeStart = btou16(buf[8:])
el.AttributeSize = btou16(buf[10:])
el.AttributeCount = btou16(buf[12:])
el.IDIndex = btou16(buf[14:])
el.ClassIndex = btou16(buf[16:])
el.StyleIndex = btou16(buf[18:])
buf = buf[el.AttributeStart:]
el.attrs = make([]*Attribute, int(el.AttributeCount))
for i := range el.attrs {
attr := new(Attribute)
if err := attr.UnmarshalBinary(buf); err != nil {
return err
}
el.attrs[i] = attr
buf = buf[el.AttributeSize:]
}
return nil
}
// MarshalBinary outputs the binary format from a given element
func (el *Element) MarshalBinary() ([]byte, error) {
el.typ = ResXMLStartElement
el.headerByteSize = 16
el.AttributeSize = 20
el.AttributeStart = 20
el.AttributeCount = uint16(len(el.attrs))
el.IDIndex = 0
el.ClassIndex = 0
el.StyleIndex = 0
el.byteSize = uint32(el.headerByteSize) + uint32(el.AttributeStart) + uint32(len(el.attrs)*int(el.AttributeSize))
bin := make([]byte, el.byteSize)
b, err := el.NodeHeader.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin, b)
putu32(bin[16:], uint32(el.NS))
putu32(bin[20:], uint32(el.Name))
putu16(bin[24:], el.AttributeStart)
putu16(bin[26:], el.AttributeSize)
putu16(bin[28:], el.AttributeCount)
putu16(bin[30:], el.IDIndex)
putu16(bin[32:], el.ClassIndex)
putu16(bin[34:], el.StyleIndex)
buf := bin[36:]
for _, attr := range el.attrs {
b, err := attr.MarshalBinary()
if err != nil {
return nil, err
}
copy(buf, b)
buf = buf[int(el.AttributeSize):]
}
return bin, nil
}
// ElementEnd marks the end of an element node, either Element or CharData.
type ElementEnd struct {
NodeHeader
NS PoolRef
Name PoolRef // name of node if binElement, raw chardata if binCharData
}
// UnmarshalBinary creates the element end from binary data
func (el *ElementEnd) UnmarshalBinary(bin []byte) error {
err := (&el.NodeHeader).UnmarshalBinary(bin)
if err != nil {
return err
}
buf := bin[el.headerByteSize:]
el.NS = PoolRef(btou32(buf))
el.Name = PoolRef(btou32(buf[4:]))
return nil
}
// MarshalBinary outputs the binary format from a given element end
func (el *ElementEnd) MarshalBinary() ([]byte, error) {
el.typ = ResXMLEndElement
el.headerByteSize = 16
el.byteSize = 24
bin := make([]byte, 24)
b, err := el.NodeHeader.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin, b)
putu32(bin[16:], uint32(el.NS))
putu32(bin[20:], uint32(el.Name))
return bin, nil
}
// Attribute represents an XML attribute
type Attribute struct {
NS PoolRef
Name PoolRef
RawValue PoolRef // The original raw string value of this attribute.
TypedValue Data // Processesd typed value of this attribute.
}
// UnmarshalBinary creates the attribute end from binary data
func (attr *Attribute) UnmarshalBinary(bin []byte) error {
attr.NS = PoolRef(btou32(bin))
attr.Name = PoolRef(btou32(bin[4:]))
attr.RawValue = PoolRef(btou32(bin[8:]))
return (&attr.TypedValue).UnmarshalBinary(bin[12:])
}
// MarshalBinary outputs the binary format from a given attribute
func (attr *Attribute) MarshalBinary() ([]byte, error) {
bin := make([]byte, 20)
putu32(bin, uint32(attr.NS))
putu32(bin[4:], uint32(attr.Name))
putu32(bin[8:], uint32(attr.RawValue))
b, err := attr.TypedValue.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin[12:], b)
return bin, nil
}
// CharData represents a CDATA node and includes ref to node's text value.
type CharData struct {
NodeHeader
RawData PoolRef // raw character data
TypedData Data // typed value of character data
}
// UnmarshalBinary creates the character data from binary data
func (cdt *CharData) UnmarshalBinary(bin []byte) error {
if err := (&cdt.NodeHeader).UnmarshalBinary(bin); err != nil {
return err
}
buf := bin[cdt.headerByteSize:]
cdt.RawData = PoolRef(btou32(buf))
return (&cdt.TypedData).UnmarshalBinary(buf[4:])
}
// MarshalBinary outputs the binary format from given character data
func (cdt *CharData) MarshalBinary() ([]byte, error) {
cdt.typ = ResXMLCharData
cdt.headerByteSize = 16
cdt.byteSize = 28
bin := make([]byte, cdt.byteSize)
b, err := cdt.NodeHeader.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin, b)
putu32(bin[16:], uint32(cdt.RawData))
b, err = cdt.TypedData.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin[20:], b)
return bin, nil
}