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update.go
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update.go
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// package update provides methods for updating EXIF data in JPEG files.
package update
import (
"fmt"
"github.com/dsoprea/go-exif/v3"
"github.com/dsoprea/go-exif/v3/common"
"github.com/dsoprea/go-jpeg-image-structure/v2"
"github.com/sfomuseum/go-exif-update/tags"
"io"
_ "log"
"strconv"
)
var ti *exif.TagIndex
var tag_paths []*exifcommon.IfdIdentity
func init() {
ti = exif.NewTagIndex()
// https://github.com/dsoprea/go-exif/blob/de2141190595193aa097a2bf3205ba0cf76dc14b/tags_data.go
tag_paths = []*exifcommon.IfdIdentity{
exifcommon.IfdStandardIfdIdentity,
exifcommon.IfdExifStandardIfdIdentity,
exifcommon.IfdExifIopStandardIfdIdentity,
exifcommon.IfdGpsInfoStandardIfdIdentity,
exifcommon.Ifd1StandardIfdIdentity,
}
}
// PrepareAndUpdateExif attempts to prepare and translate EXIF properties in defined in exif_props
// in to their appropriate dsoprea/go-exif types and format and then updates the EXIF data encoded in
// r and writes that data to wr. This method also supports a handful of custom properties that are
// prefixed with X- and used to populate known EXIF properties. These are:
// * X-Latitude and X-Longitude, which convert and assign decimal latitude and longitude coordinates
// in to their GPSLatitude/Longitude and GPSLatitude/LongitudeRef EXIF properties.
func PrepareAndUpdateExif(r io.Reader, wr io.Writer, exif_props map[string]interface{}) error {
prepared := make(map[string]interface{})
var lat float64
var lon float64
x_lat, has_lat := exif_props["X-Latitude"]
x_lon, has_lon := exif_props["X-Longitude"]
if has_lat && !has_lon {
return fmt.Errorf("Missing X-Longitude property (X-Latitude is set)")
}
if has_lon && !has_lat {
return fmt.Errorf("Missing X-Latitude property (X-Longitude is set)")
}
if has_lat && has_lon {
switch x_lat.(type) {
case float64:
lat = x_lat.(float64)
case string:
l, err := strconv.ParseFloat(x_lat.(string), 64)
if err != nil {
return err
}
lat = l
default:
return fmt.Errorf("Invalid type for latitude, %T", lat)
}
switch x_lon.(type) {
case float64:
lon = x_lon.(float64)
case string:
l, err := strconv.ParseFloat(x_lon.(string), 64)
if err != nil {
return err
}
lon = l
default:
return fmt.Errorf("Invalid type for longitude")
}
err := AppendGPSPropertiesWithLatitudeAndLongitude(prepared, lat, lon)
if err != nil {
return err
}
delete(exif_props, "X-Latitude")
delete(exif_props, "X-Longitude")
}
for k, v := range exif_props {
str_v := fmt.Sprintf("%v", v)
v2, err := PrepareTag(k, str_v)
if err != nil {
return fmt.Errorf("Failed to prepare tag '%s', %v", k, err)
}
prepared[k] = v2
}
return UpdateExif(r, wr, prepared)
}
// This is really nothing more than a thin wrapper around the example code in
// dsoprea's go-jpeg-image-structure package.
// UpdateExif updates the EXIF data encoded in r and writes that data to wr.
func UpdateExif(r io.Reader, wr io.Writer, exif_props map[string]interface{}) error {
img_data, err := io.ReadAll(r)
// https://pkg.go.dev/github.com/dsoprea/go-jpeg-image-structure/v2?utm_source=godoc#example-SegmentList.SetExif
jmp := jpegstructure.NewJpegMediaParser()
intfc, err := jmp.ParseBytes(img_data)
if err != nil {
return err
}
sl := intfc.(*jpegstructure.SegmentList)
rootIb, err := sl.ConstructExifBuilder()
if err != nil {
return err
}
for k, v := range exif_props {
ok, err := tags.IsSupported(k)
if err != nil {
return err
}
if !ok {
return fmt.Errorf("Tag '%s' is not supported at this time", k)
}
id, _, err := GetIndexedTagFromName(k)
if err != nil {
return err
}
err = setExifTag(rootIb, id.UnindexedString(), k, v)
if err != nil {
return err
}
}
// Update the exif segment.
err = sl.SetExif(rootIb)
if err != nil {
return err
}
return sl.Write(wr)
}
// Return the *exifcommon.IfdIdentity and *exif.IndexedTag instances associated
// with a given EXIF string tag name.
func GetIndexedTagFromName(k string) (*exifcommon.IfdIdentity, *exif.IndexedTag, error) {
for _, id := range tag_paths {
t, err := ti.GetWithName(id, k)
if err != nil {
continue
}
return id, t, nil
}
return nil, nil, fmt.Errorf("Unrecognized tag, %s", k)
}
// Cribbed from https://github.com/dsoprea/go-exif/issues/11
func setExifTag(rootIB *exif.IfdBuilder, ifdPath string, tagName string, tagValue interface{}) error {
// log.Printf("setTag(): ifdPath: %v, tagName: %v, tagValue: %v", ifdPath, tagName, tagValue)
ifdIb, err := exif.GetOrCreateIbFromRootIb(rootIB, ifdPath)
if err != nil {
return fmt.Errorf("Failed to get or create IB for %s: %v", ifdPath, err)
}
err = ifdIb.SetStandardWithName(tagName, tagValue)
if err != nil {
return fmt.Errorf("failed to set %s tag: %v", tagName, err)
}
return nil
}