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 (p *innerCBuffer) Close() error {
if p.cptr != nil {
C.webpFree(p.cptr)
}
*p = innerCBuffer{}
// no need for a finalizer anymore
runtime.SetFinalizer(p, nil)
return nil
}
func webpGetXMP(data []byte) (metadata []byte, err error) {
if len(data) == 0 {
err = errors.New("webpGetXMP: bad arguments")
return
}
isCBuf := false
cData := cgoSafePtr(data, isCBuf)
defer cgoFreePtr(cData, isCBuf)
rv := C.cgoWebpGetXMP((*C.uint8_t)(cData), C.size_t(len(data)))
if rv.ok != 1 {
err = errors.New("webpGetXMP: failed")
return
}
metadata = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
}
func (p *innerCBuffer) Resize(size int) error {
if size < 0 {
return errors.New("webp: cBuffer.Resize, bad size!")
}
if p.dontResize {
return errors.New("webp: cBuffer.Resize, donot resize!")
}
if n := len(p.data); n > 0 && n != size {
C.webpFree(p.cptr)
p.cptr = nil
p.data = nil
}
p.Close()
if size > 0 {
p.cptr = C.webpMalloc(C.size_t(size))
p.data = (*[1 << 30]byte)(p.cptr)[0:size:size]
}
return nil
}
func webpSetEXIF(data, metadata []byte) (newData []byte, err error) {
if len(data) == 0 || len(metadata) == 0 {
err = errors.New("webpSetEXIF: bad arguments")
return
}
isCBuf := false
cData := cgoSafePtr(data, isCBuf)
defer cgoFreePtr(cData, isCBuf)
cMetadata := cgoSafePtr(metadata, isCBuf)
defer cgoFreePtr(cMetadata, isCBuf)
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("webpSetEXIF: failed")
return
}
newData = C.GoBytes(unsafe.Pointer(rv.ptr), C.int(rv.size))
C.webpFree(unsafe.Pointer(rv.ptr))
return
}