// ===== CFData =====
func convertBytesToCFData(data []byte) C.CFDataRef {
var ptr *C.UInt8
if len(data) > 0 {
ptr = (*C.UInt8)((&data[0]))
}
return C.CFDataCreate(nil, ptr, C.CFIndex(len(data)))
}
func CGImageCreateWithImage(img image.Image) (cgimg C.CGImageRef, err error) {
var data imageData
if data, err = extractImageData(img); err != nil {
return
}
memory := C.CFDataCreate(
nil,
(*C.UInt8)(unsafe.Pointer(&data.pixels[0])),
C.CFIndex(len(data.pixels)),
)
provider := C.CGDataProviderCreateWithCFData(memory)
cgimg = C.CGImageCreate(
C.size_t(data.width),
C.size_t(data.height),
C.size_t(data.bpc),
C.size_t(data.bpp),
C.size_t(data.stride),
data.colors,
data.info,
provider,
nil,
false,
C.kCGRenderingIntentDefault,
)
C.CFRelease(provider)
C.CFRelease(memory)
C.CFRelease(data.colors)
return
}
// The returned CFDataRef, if non-nil, must be released via CFRelease.
func bytesToCFData(b []byte) C.CFDataRef {
var p *C.UInt8
if len(b) > 0 {
p = (*C.UInt8)(&b[0])
}
return C.CFDataCreate(nil, p, C.CFIndex(len(b)))
}
func CFNetServiceSetTXTData(cns *CFNetService, data []byte) bool {
p := unsafe.Pointer(nil)
if data != nil && len(data) > 0 {
p = unsafe.Pointer(&data[0])
}
data_ := C.CFDataCreate(nil, (*C.UInt8)(p), C.CFIndex(len(data)))
retval := C.CFNetServiceSetTXTData(cns.ref, data_)
C.CFRelease((C.CFTypeRef)(data_))
return retval != 0
}
// BytesToCFData will return a CFDataRef and if non-nil, must be released with
// Release(ref).
func BytesToCFData(b []byte) (C.CFDataRef, error) {
if uint64(len(b)) > math.MaxUint32 {
return nil, errors.New("Data is too large")
}
var p *C.UInt8
if len(b) > 0 {
p = (*C.UInt8)(&b[0])
}
cfData := C.CFDataCreate(nil, p, C.CFIndex(len(b)))
if cfData == nil {
return nil, fmt.Errorf("CFDataCreate failed")
}
return cfData, nil
}