func webpSetMetadata(data, metadata []byte, format string) (newData []byte, err error) {
if len(data) == 0 || len(metadata) == 0 {
err = errors.New("webpSetMetadata: bad arguments")
return
}
isCBuf := false
cData := cgoSafePtr(data, isCBuf)
defer cgoFreePtr(cData, isCBuf)
cMetadata := cgoSafePtr(metadata, isCBuf)
defer cgoFreePtr(cMetadata, isCBuf)
switch format {
case "EXIF":
rv := C.cgoWebpSetEXIF(
(*C.uint8_t)(cData), C.size_t(len(data)),
(*C.char)(cMetadata), C.size_t(len(metadata)),
)
if rv.ok != 1 {
err = errors.New("webpSetMetadata: failed")
return
}
newData = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
case "ICCP":
rv := C.cgoWebpSetICCP(
(*C.uint8_t)(cData), C.size_t(len(data)),
(*C.char)(cMetadata), C.size_t(len(metadata)),
)
if rv.ok != 1 {
err = errors.New("webpSetMetadata: failed")
return
}
newData = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
case "XMP":
rv := C.cgoWebpSetXMP(
(*C.uint8_t)(cData), C.size_t(len(data)),
(*C.char)(cMetadata), C.size_t(len(metadata)),
)
if rv.ok != 1 {
err = errors.New("webpSetMetadata: failed")
return
}
newData = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
default:
err = errors.New("webpSetMetadata: unknown format")
return
}
}
func webpSetXMP(data, metadata []byte) (newData []byte, err error) {
if len(data) == 0 || len(metadata) == 0 {
err = errors.New("webpSetXMP: bad arguments")
return
}
isCBuf := false
cData := cgoSafePtr(data, isCBuf)
defer cgoFreePtr(cData, isCBuf)
cMetadata := cgoSafePtr(metadata, isCBuf)
defer cgoFreePtr(cMetadata, isCBuf)
rv := C.cgoWebpSetXMP(
(*C.uint8_t)(cData), C.size_t(len(data)),
(*C.char)(cMetadata), C.size_t(len(metadata)),
)
if rv.ok != 1 {
err = errors.New("webpSetXMP: failed")
return
}
newData = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
}