func (ke keychainError) Error() string {
errorMessageCFString := C.SecCopyErrorMessageString(C.OSStatus(ke), nil)
defer C.CFRelease(C.CFTypeRef(errorMessageCFString))
errorMessageCString := C.CFStringGetCStringPtr(errorMessageCFString, C.kCFStringEncodingASCII)
if errorMessageCString != nil {
return C.GoString(errorMessageCString)
}
return fmt.Sprintf("keychainError with unknown error code %d", C.OSStatus(ke))
}
//export go_audiofile_readproc
func go_audiofile_readproc(data unsafe.Pointer, inPosition C.SInt64, requestCount C.UInt32, buffer unsafe.Pointer, actualCount *C.UInt32) C.OSStatus {
af := (*AudioFile)(data)
length := int(requestCount)
hdr := reflect.SliceHeader{
Data: uintptr(buffer),
Len: length,
Cap: length,
}
bslice := *(*[]byte)(unsafe.Pointer(&hdr))
n, err := af.target.ReadAt(bslice, int64(inPosition))
*actualCount = C.UInt32(n)
if err == io.EOF {
return C.kAudioFileEndOfFileError
} else if err != nil {
return C.kAudioFileUnspecifiedError
}
return C.OSStatus(0)
}
//export go_audiofile_writeproc
func go_audiofile_writeproc(data unsafe.Pointer, inPosition C.SInt64, requestCount C.UInt32, buffer unsafe.Pointer, actualCount *C.UInt32) C.OSStatus {
af := (*AudioFile)(data)
length := int(requestCount)
hdr := reflect.SliceHeader{
Data: uintptr(buffer),
Len: length,
Cap: length,
}
bslice := *(*[]byte)(unsafe.Pointer(&hdr))
npos := int64(inPosition)
n, err := af.target.WriteAt(bslice, npos)
*actualCount = C.UInt32(n)
if err != nil {
return C.kAudioFileUnspecifiedError
}
if npos+int64(n) > af.fileSize {
af.fileSize = npos + int64(n)
}
return C.OSStatus(0)
}