func convertCFStringToString(cfStr C.CFStringRef) string {
cstrPtr := C.CFStringGetCStringPtr(cfStr, C.kCFStringEncodingUTF8)
if cstrPtr != nil {
return C.GoString(cstrPtr)
}
// quick path doesn't work, so copy the bytes out to a buffer
length := C.CFStringGetLength(cfStr)
if length == 0 {
// short-cut for empty strings
return ""
}
cfRange := C.CFRange{0, length}
enc := C.CFStringEncoding(C.kCFStringEncodingUTF8)
// first find the buffer size necessary
var usedBufLen C.CFIndex
if C.CFStringGetBytes(cfStr, cfRange, enc, 0, C.false, nil, 0, &usedBufLen) > 0 {
bytes := make([]byte, usedBufLen)
buffer := (*C.UInt8)(unsafe.Pointer(&bytes[0]))
if C.CFStringGetBytes(cfStr, cfRange, enc, 0, C.false, buffer, usedBufLen, nil) > 0 {
// bytes is now filled up
// convert it to a string
header := (*reflect.SliceHeader)(unsafe.Pointer(&bytes))
strHeader := &reflect.StringHeader{
Data: header.Data,
Len: header.Len,
}
return *(*string)(unsafe.Pointer(strHeader))
}
}
// we failed to convert, for some reason. Too bad there's no nil string
return ""
}
func NSStringToString(inString Object) string {
cr := C.CFStringRef(unsafe.Pointer(inString))
var usedBufLen C.CFIndex
rng := C.CFRange{C.CFIndex(0), C.CFStringGetLength(cr)}
n := int(C.CFStringGetBytes(cr, rng, C.kCFStringEncodingUTF8, 0, 0, nil, 0, &usedBufLen))
if n <= 0 {
return ""
}
buf := make([]byte, int(usedBufLen))
C.CFStringGetBytes(cr, rng, C.kCFStringEncodingUTF8, 0, 0, (*C.UInt8)(unsafe.Pointer(&buf[0])), C.CFIndex(len(buf)), &usedBufLen)
sh := &reflect.StringHeader{
Data: uintptr(unsafe.Pointer(&buf[0])),
Len: int(usedBufLen),
}
return *(*string)(unsafe.Pointer(sh))
}
// CFStringToString converts a CFStringRef to a string.
func CFStringToString(s C.CFStringRef) string {
p := C.CFStringGetCStringPtr(s, C.kCFStringEncodingUTF8)
if p != nil {
return C.GoString(p)
}
length := C.CFStringGetLength(s)
if length == 0 {
return ""
}
maxBufLen := C.CFStringGetMaximumSizeForEncoding(length, C.kCFStringEncodingUTF8)
if maxBufLen == 0 {
return ""
}
buf := make([]byte, maxBufLen)
var usedBufLen C.CFIndex
_ = C.CFStringGetBytes(s, C.CFRange{0, length}, C.kCFStringEncodingUTF8, C.UInt8(0), C.false, (*C.UInt8)(&buf[0]), maxBufLen, &usedBufLen)
return string(buf[:usedBufLen])
}
// cfstringGo creates a Go string for a CoreFoundation string using the CoreFoundation UTF-8 converter.
// For short strings this is an efficiency nightmare! In this package this function is not currently used
// in any critical path.
func cfstringGo(cfs C.CFStringRef) string {
var usedBufLen C.CFIndex
n := C.cfstring_utf8_length(cfs, &usedBufLen)
if n <= 0 {
return ""
}
rng := C.CFRange{location: C.CFIndex(0), length: n}
buf := make([]byte, int(usedBufLen))
bufp := unsafe.Pointer(&buf[0])
C.CFStringGetBytes(cfs, rng, C.kCFStringEncodingUTF8, 0, 0, (*C.UInt8)(bufp), C.CFIndex(len(buf)), &usedBufLen)
sh := &reflect.StringHeader{
Data: uintptr(bufp),
Len: int(usedBufLen),
}
return *(*string)(unsafe.Pointer(sh))
}
// Converts a CGStringRef object to a Go string.
func CFStringToGoString(s C.CFStringRef) string {
ptr := C.CFStringGetCStringPtr(s, C.kCFStringEncodingUTF8)
if ptr != nil {
return C.GoString(ptr)
}
n := C.CFStringGetLength(s)
b := make([]byte, int(4*n))
C.CFStringGetBytes(
s,
C.CFRangeMake(0, n),
C.kCFStringEncodingUTF8,
'?',
0,
(*C.UInt8)(unsafe.Pointer(&b[0])),
C.CFIndex(len(b)),
&n,
)
return string(b[:n])
}
