2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.client.result.optional;
19 import com.google.zxing.Result;
20 import com.google.zxing.client.result.TextParsedResult;
23 * Recognizes an NDEF message that encodes text according to the
24 * "Text Record Type Definition" specification.
26 * @author srowen@google.com (Sean Owen)
28 final class NDEFTextResultParser extends AbstractNDEFResultParser {
30 public static TextParsedResult parse(Result result) {
31 byte[] bytes = result.getRawBytes();
35 NDEFRecord ndefRecord = NDEFRecord.readRecord(bytes, 0);
36 if (ndefRecord == null || !ndefRecord.isMessageBegin() || !ndefRecord.isMessageEnd()) {
39 if (!ndefRecord.getType().equals(NDEFRecord.TEXT_WELL_KNOWN_TYPE)) {
42 String[] languageText = decodeTextPayload(ndefRecord.getPayload());
43 return new TextParsedResult(languageText[0], languageText[1]);
46 static String[] decodeTextPayload(byte[] payload) {
47 byte statusByte = payload[0];
48 boolean isUTF16 = (statusByte & 0x80) != 0;
49 int languageLength = statusByte & 0x1F;
50 // language is always ASCII-encoded:
51 String language = bytesToString(payload, 1, languageLength, "US-ASCII");
52 String encoding = isUTF16 ? "UTF-16" : "UTF8";
53 String text = bytesToString(payload, 1 + languageLength, payload.length - languageLength - 1, encoding);
54 return new String[] { language, text };