func lookup_field(msg *message.Message, fn string, fi int, ai int) (int,
unsafe.Pointer, int) {
var field *message.Field
if fi != 0 {
fields := msg.FindAllFields(fn)
if fi >= len(fields) {
return 0, unsafe.Pointer(nil), 0
}
field = fields[fi]
} else {
if field = msg.FindFirstField(fn); field == nil {
return 0, unsafe.Pointer(nil), 0
}
}
fieldType := int(field.GetValueType())
switch field.GetValueType() {
case message.Field_STRING:
if ai >= len(field.ValueString) {
return fieldType, unsafe.Pointer(nil), 0
}
value := field.ValueString[ai]
cs := C.CString(value) // freed by the caller
return fieldType, unsafe.Pointer(cs), len(value)
case message.Field_BYTES:
if ai >= len(field.ValueBytes) {
return fieldType, unsafe.Pointer(nil), 0
}
value := field.ValueBytes[ai]
return fieldType, unsafe.Pointer(&field.ValueBytes[ai][0]), len(value)
case message.Field_INTEGER:
if ai >= len(field.ValueInteger) {
return fieldType, unsafe.Pointer(nil), 0
}
return fieldType, unsafe.Pointer(&field.ValueInteger[ai]), 0
case message.Field_DOUBLE:
if ai >= len(field.ValueDouble) {
return fieldType, unsafe.Pointer(nil), 0
}
return fieldType, unsafe.Pointer(&field.ValueDouble[ai]), 0
case message.Field_BOOL:
if ai >= len(field.ValueBool) {
return fieldType, unsafe.Pointer(nil), 0
}
return fieldType, unsafe.Pointer(&field.ValueBool[ai]), 0
}
return 0, unsafe.Pointer(nil), 0
}
func getFieldAsString(msg *message.Message, mvar *messageVariable) string {
var field *message.Field
if mvar.fi != 0 {
fields := msg.FindAllFields(mvar.name)
if mvar.fi >= len(fields) {
return ""
}
field = fields[mvar.fi]
} else {
if field = msg.FindFirstField(mvar.name); field == nil {
return ""
}
}
switch field.GetValueType() {
case message.Field_STRING:
if mvar.ai >= len(field.ValueString) {
return ""
}
return field.ValueString[mvar.ai]
case message.Field_BYTES:
if mvar.ai >= len(field.ValueBytes) {
return ""
}
return string(field.ValueBytes[mvar.ai])
case message.Field_INTEGER:
if mvar.ai >= len(field.ValueInteger) {
return ""
}
return fmt.Sprintf("%d", field.ValueInteger[mvar.ai])
case message.Field_DOUBLE:
if mvar.ai >= len(field.ValueDouble) {
return ""
}
return fmt.Sprintf("%g", field.ValueDouble[mvar.ai])
case message.Field_BOOL:
if mvar.ai >= len(field.ValueBool) {
return ""
}
return fmt.Sprintf("%t", field.ValueBool[mvar.ai])
}
return ""
}