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writer.go
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writer.go
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package main
import (
"io"
"time"
)
// Writer is responsible for writing nodes to FBX
type Writer struct {
w io.Writer
currentOffset uint64
err error
complete bool
}
// NewWriter creates a new writer and immediately writes the FBX header and
// top node
func NewWriter(w io.Writer) (Writer, error) {
// Write header
n, err := w.Write([]byte{
75, 97, 121, 100,
97, 114, 97, 32,
70, 66, 88, 32,
66, 105, 110, 97,
114, 121, 32, 32,
0, 26, 0, 76, 29,
0, 0,
})
fbxWriter := Writer{
w: w,
currentOffset: uint64(n),
err: nil,
complete: false,
}
if err != nil {
return fbxWriter, err
}
creationTime := time.Now()
fbxWriter.WriteNode(NewNodeParent(
"FBXHeaderExtension",
NewNodeInt32("FBXHeaderVersion", 1003),
NewNodeInt32("FBXVersion", 7500),
NewNodeInt32("EncryptionType", 0),
CreateTimestampNode(creationTime),
NewNodeString("Creator", "https://github.com/EliCDavis"),
))
fbxWriter.WriteNode(NewNodeString("CreationTime", creationTime.String()))
fbxWriter.WriteNode(NewNodeString("Creator", "https://github.com/EliCDavis"))
return fbxWriter, nil
}
// WriteNode writes a node to the writer, and returns true if you can continue writing
func (w *Writer) WriteNode(n *Node) bool {
if w.err != nil || w.complete {
return false
}
newOffset, err := n.Write(w.w, w.currentOffset, false)
if err != nil {
w.err = err
return false
}
w.currentOffset = newOffset
return true
}
func (w *Writer) Complete() error {
if w.err != nil || w.complete {
return w.err
}
n, err := w.w.Write([]byte{
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
})
w.currentOffset += uint64(n)
w.err = err
return w.err
}