mirror of
https://github.com/superseriousbusiness/gotosocial.git
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352 lines
7.4 KiB
Go
352 lines
7.4 KiB
Go
package jpegstructure
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import (
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"bytes"
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"errors"
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"fmt"
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"crypto/sha1"
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"encoding/hex"
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"github.com/dsoprea/go-exif/v3"
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"github.com/dsoprea/go-exif/v3/common"
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"github.com/dsoprea/go-iptc"
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"github.com/dsoprea/go-logging"
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"github.com/dsoprea/go-photoshop-info-format"
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"github.com/dsoprea/go-utility/v2/image"
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)
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const (
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pirIptcImageResourceId = uint16(0x0404)
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)
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var (
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// exifPrefix is the prefix found at the top of an EXIF slice. This is JPEG-
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// specific.
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exifPrefix = []byte{'E', 'x', 'i', 'f', 0, 0}
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xmpPrefix = []byte("http://ns.adobe.com/xap/1.0/\000")
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ps30Prefix = []byte("Photoshop 3.0\000")
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)
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var (
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// ErrNoXmp is returned if XMP data was requested but not found.
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ErrNoXmp = errors.New("no XMP data")
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// ErrNoIptc is returned if IPTC data was requested but not found.
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ErrNoIptc = errors.New("no IPTC data")
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// ErrNoPhotoshopData is returned if Photoshop info was requested but not
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// found.
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ErrNoPhotoshopData = errors.New("no photoshop data")
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)
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// SofSegment has info read from a SOF segment.
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type SofSegment struct {
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// BitsPerSample is the bits-per-sample.
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BitsPerSample byte
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// Width is the image width.
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Width uint16
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// Height is the image height.
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Height uint16
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// ComponentCount is the number of color components.
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ComponentCount byte
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}
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// String returns a string representation of the SOF segment.
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func (ss SofSegment) String() string {
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// TODO(dustin): Add test
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return fmt.Sprintf("SOF<BitsPerSample=(%d) Width=(%d) Height=(%d) ComponentCount=(%d)>", ss.BitsPerSample, ss.Width, ss.Height, ss.ComponentCount)
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}
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// SegmentVisitor describes a segment-visitor struct.
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type SegmentVisitor interface {
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// HandleSegment is triggered for each segment encountered as well as the
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// scan-data.
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HandleSegment(markerId byte, markerName string, counter int, lastIsScanData bool) error
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}
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// SofSegmentVisitor describes a visitor that is only called for each SOF
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// segment.
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type SofSegmentVisitor interface {
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// HandleSof is called for each encountered SOF segment.
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HandleSof(sof *SofSegment) error
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}
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// Segment describes a single segment.
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type Segment struct {
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MarkerId byte
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MarkerName string
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Offset int
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Data []byte
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photoshopInfo map[uint16]photoshopinfo.Photoshop30InfoRecord
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iptcTags map[iptc.StreamTagKey][]iptc.TagData
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}
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// SetExif encodes and sets EXIF data into this segment.
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func (s *Segment) SetExif(ib *exif.IfdBuilder) (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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ibe := exif.NewIfdByteEncoder()
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exifData, err := ibe.EncodeToExif(ib)
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log.PanicIf(err)
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l := len(exifPrefix)
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s.Data = make([]byte, l+len(exifData))
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copy(s.Data[0:], exifPrefix)
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copy(s.Data[l:], exifData)
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return nil
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}
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// Exif returns an `exif.Ifd` instance for the EXIF data we currently have.
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func (s *Segment) Exif() (rootIfd *exif.Ifd, data []byte, 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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l := len(exifPrefix)
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rawExif := s.Data[l:]
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jpegLogger.Debugf(nil, "Attempting to parse (%d) byte EXIF blob (Exif).", len(rawExif))
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im, err := exifcommon.NewIfdMappingWithStandard()
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log.PanicIf(err)
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ti := exif.NewTagIndex()
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_, index, err := exif.Collect(im, ti, rawExif)
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log.PanicIf(err)
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return index.RootIfd, rawExif, nil
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}
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// FlatExif parses the EXIF data and just returns a list of tags.
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func (s *Segment) FlatExif() (exifTags []exif.ExifTag, 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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// TODO(dustin): Add test
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l := len(exifPrefix)
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rawExif := s.Data[l:]
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jpegLogger.Debugf(nil, "Attempting to parse (%d) byte EXIF blob (FlatExif).", len(rawExif))
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exifTags, _, err = exif.GetFlatExifData(rawExif, nil)
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log.PanicIf(err)
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return exifTags, nil
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}
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// EmbeddedString returns a string of properties that can be embedded into an
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// longer string of properties.
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func (s *Segment) EmbeddedString() string {
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h := sha1.New()
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h.Write(s.Data)
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// TODO(dustin): Add test
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digestString := hex.EncodeToString(h.Sum(nil))
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return fmt.Sprintf("OFFSET=(0x%08x %10d) ID=(0x%02x) NAME=[%-5s] SIZE=(%10d) SHA1=[%s]", s.Offset, s.Offset, s.MarkerId, markerNames[s.MarkerId], len(s.Data), digestString)
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}
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// String returns a descriptive string.
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func (s *Segment) String() string {
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// TODO(dustin): Add test
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return fmt.Sprintf("Segment<%s>", s.EmbeddedString())
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}
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// IsExif returns true if EXIF data.
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func (s *Segment) IsExif() bool {
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if s.MarkerId != MARKER_APP1 {
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return false
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}
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// TODO(dustin): Add test
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l := len(exifPrefix)
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if len(s.Data) < l {
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return false
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}
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if bytes.Equal(s.Data[:l], exifPrefix) == false {
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return false
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}
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return true
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}
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// IsXmp returns true if XMP data.
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func (s *Segment) IsXmp() bool {
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if s.MarkerId != MARKER_APP1 {
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return false
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}
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// TODO(dustin): Add test
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l := len(xmpPrefix)
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if len(s.Data) < l {
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return false
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}
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if bytes.Equal(s.Data[:l], xmpPrefix) == false {
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return false
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}
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return true
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}
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// FormattedXmp returns a formatted XML string. This only makes sense for a
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// segment comprised of XML data (like XMP).
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func (s *Segment) FormattedXmp() (formatted string, 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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// TODO(dustin): Add test
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if s.IsXmp() != true {
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log.Panicf("not an XMP segment")
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}
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l := len(xmpPrefix)
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raw := string(s.Data[l:])
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formatted, err = FormatXml(raw)
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log.PanicIf(err)
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return formatted, nil
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}
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func (s *Segment) parsePhotoshopInfo() (photoshopInfo map[uint16]photoshopinfo.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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if s.photoshopInfo != nil {
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return s.photoshopInfo, nil
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}
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if s.MarkerId != MARKER_APP13 {
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return nil, ErrNoPhotoshopData
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}
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l := len(ps30Prefix)
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if len(s.Data) < l {
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return nil, ErrNoPhotoshopData
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}
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if bytes.Equal(s.Data[:l], ps30Prefix) == false {
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return nil, ErrNoPhotoshopData
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}
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data := s.Data[l:]
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b := bytes.NewBuffer(data)
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// Parse it.
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pirIndex, err := photoshopinfo.ReadPhotoshop30Info(b)
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log.PanicIf(err)
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s.photoshopInfo = pirIndex
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return s.photoshopInfo, nil
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}
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// IsIptc returns true if XMP data.
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func (s *Segment) IsIptc() bool {
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// TODO(dustin): Add test
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// There's a cost to determining if there's IPTC data, so we won't do it
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// more than once.
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if s.iptcTags != nil {
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return true
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}
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photoshopInfo, err := s.parsePhotoshopInfo()
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if err != nil {
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if err == ErrNoPhotoshopData {
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return false
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}
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log.Panic(err)
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}
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// Bail if the Photoshop info doesn't have IPTC data.
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_, found := photoshopInfo[pirIptcImageResourceId]
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if found == false {
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return false
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}
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return true
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}
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// Iptc parses Photoshop info (if present) and then parses the IPTC info inside
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// it (if present).
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func (s *Segment) Iptc() (tags map[iptc.StreamTagKey][]iptc.TagData, 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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// Cache the parse.
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if s.iptcTags != nil {
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return s.iptcTags, nil
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}
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photoshopInfo, err := s.parsePhotoshopInfo()
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log.PanicIf(err)
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iptcPir, found := photoshopInfo[pirIptcImageResourceId]
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if found == false {
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return nil, ErrNoIptc
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}
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b := bytes.NewBuffer(iptcPir.Data)
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tags, err = iptc.ParseStream(b)
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log.PanicIf(err)
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s.iptcTags = tags
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return tags, nil
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}
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var (
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// Enforce interface conformance.
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_ riimage.MediaContext = new(Segment)
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)
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