func webpGetEXIF(data []byte) (metadata []byte, err error) {
if len(data) == 0 {
err = errors.New("webpGetEXIF: bad arguments")
return
}
isCBuf := false
cData := cgoSafePtr(data, isCBuf)
defer cgoFreePtr(cData, isCBuf)
rv := C.cgoWebpGetEXIF((*C.uint8_t)(cData), C.size_t(len(data)))
if rv.ok != 1 {
err = errors.New("webpGetEXIF: failed")
return
}
metadata = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
}
func webpGetMetadata(data []byte, format string) (metadata []byte, err error) {
if len(data) == 0 {
err = errors.New("webpGetMetadata: bad arguments")
return
}
isCBuf := false
cData := cgoSafePtr(data, isCBuf)
defer cgoFreePtr(cData, isCBuf)
switch format {
case "EXIF":
rv := C.cgoWebpGetEXIF((*C.uint8_t)(cData), C.size_t(len(data)))
if rv.ok != 1 {
err = errors.New("webpGetMetadata: not found")
return
}
metadata = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
case "ICCP":
rv := C.cgoWebpGetICCP((*C.uint8_t)(cData), C.size_t(len(data)))
if rv.ok != 1 {
err = errors.New("webpGetMetadata: not found")
return
}
metadata = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
case "XMP":
rv := C.cgoWebpGetXMP((*C.uint8_t)(cData), C.size_t(len(data)))
if rv.ok != 1 {
err = errors.New("webpGetMetadata: not found")
return
}
metadata = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
default:
err = errors.New("webpGetMetadata: unknown format")
return
}
}