120 lines
2.5 KiB
Go
120 lines
2.5 KiB
Go
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package photoshopinfo
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import (
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"fmt"
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"io"
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"encoding/binary"
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log "github.com/dsoprea/go-logging"
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)
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var (
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defaultByteOrder = binary.BigEndian
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)
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// Photoshop30InfoRecord is the data for one parsed Photoshop-info record.
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type Photoshop30InfoRecord struct {
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// RecordType is the record-type.
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RecordType string
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// ImageResourceId is the image resource-ID.
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ImageResourceId uint16
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// Name is the name of the record. It is optional and will be an empty-
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// string if not present.
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Name string
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// Data is the raw record data.
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Data []byte
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}
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// String returns a descriptive string.
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func (pir Photoshop30InfoRecord) String() string {
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return fmt.Sprintf("RECORD-TYPE=[%s] IMAGE-RESOURCE-ID=[0x%04x] NAME=[%s] DATA-SIZE=(%d)", pir.RecordType, pir.ImageResourceId, pir.Name, len(pir.Data))
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}
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// ReadPhotoshop30InfoRecord parses a single photoshop-info record.
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func ReadPhotoshop30InfoRecord(r io.Reader) (pir Photoshop30InfoRecord, err error) {
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defer func() {
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if state := recover(); state != nil {
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err = log.Wrap(state.(error))
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}
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}()
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recordType := make([]byte, 4)
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_, err = io.ReadFull(r, recordType)
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if err != nil {
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if err == io.EOF {
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return pir, err
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}
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log.Panic(err)
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}
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// TODO(dustin): Move BigEndian to constant/config.
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irId := uint16(0)
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err = binary.Read(r, defaultByteOrder, &irId)
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log.PanicIf(err)
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nameSize := uint8(0)
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err = binary.Read(r, defaultByteOrder, &nameSize)
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log.PanicIf(err)
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// Add an extra byte if the two length+data size is odd to make the total
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// bytes read even.
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doAddPadding := (1+nameSize)%2 == 1
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if doAddPadding == true {
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nameSize++
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}
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name := make([]byte, nameSize)
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_, err = io.ReadFull(r, name)
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log.PanicIf(err)
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// If the last byte is padding, truncate it.
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if doAddPadding == true {
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name = name[:nameSize-1]
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}
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dataSize := uint32(0)
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err = binary.Read(r, defaultByteOrder, &dataSize)
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log.PanicIf(err)
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data := make([]byte, dataSize+dataSize%2)
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_, err = io.ReadFull(r, data)
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log.PanicIf(err)
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data = data[:dataSize]
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pir = Photoshop30InfoRecord{
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RecordType: string(recordType),
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ImageResourceId: irId,
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Name: string(name),
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Data: data,
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}
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return pir, nil
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}
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// ReadPhotoshop30Info parses a sequence of photoship-info records from the stream.
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func ReadPhotoshop30Info(r io.Reader) (pirIndex map[uint16]Photoshop30InfoRecord, err error) {
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pirIndex = make(map[uint16]Photoshop30InfoRecord)
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for {
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pir, err := ReadPhotoshop30InfoRecord(r)
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if err != nil {
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if err == io.EOF {
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break
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}
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log.Panic(err)
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}
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pirIndex[pir.ImageResourceId] = pir
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}
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return pirIndex, nil
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}
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