Index: device/nfc/android/java/src/org/chromium/device/nfc/NfcTypeConverter.java |
diff --git a/device/nfc/android/java/src/org/chromium/device/nfc/NfcTypeConverter.java b/device/nfc/android/java/src/org/chromium/device/nfc/NfcTypeConverter.java |
new file mode 100644 |
index 0000000000000000000000000000000000000000..1c3a85464aaa697f2b2a369b47d628b0734bcd6b |
--- /dev/null |
+++ b/device/nfc/android/java/src/org/chromium/device/nfc/NfcTypeConverter.java |
@@ -0,0 +1,95 @@ |
+// Copyright 2016 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+package org.chromium.device.nfc; |
+ |
+import android.nfc.NdefMessage; |
+import android.nfc.NdefRecord; |
+import android.os.Build; |
+ |
+import org.chromium.base.Log; |
+import org.chromium.mojom.device.nfc.NfcMessage; |
+import org.chromium.mojom.device.nfc.NfcRecord; |
+import org.chromium.mojom.device.nfc.NfcRecordType; |
+ |
+import java.io.UnsupportedEncodingException; |
+import java.util.ArrayList; |
+import java.util.List; |
+ |
+/** |
+ * Utility class that provides convesion between Android NdefMessage |
+ * and mojo NfcMessage data structures. |
+ */ |
+public final class NfcTypeConverter { |
+ private static final String TAG = "NfcTypeConverter"; |
+ private static final String DOMAIN = "w3.org"; |
+ private static final String TYPE = "webnfc"; |
+ private static final String WEBNFC_URN = DOMAIN + ":" + TYPE; |
+ private static final String TEXT_MIME = "text/plain"; |
+ private static final String JSON_MIME = "application/json"; |
+ private static final String CHARSET_UTF8 = ";charset=UTF-8"; |
+ private static final String CHARSET_UTF16 = ";charset=UTF-16"; |
+ |
+ /** |
+ * Converts mojo NfcMessage to android.nfc.NdefMessage |
+ */ |
+ public static NdefMessage toNdefMessage(NfcMessage message) throws InvalidNfcMessageException { |
+ if (message == null || message.data.length == 0) throw new InvalidNfcMessageException(); |
+ |
+ try { |
+ List<NdefRecord> records = new ArrayList<NdefRecord>(); |
+ for (int i = 0; i < message.data.length; ++i) { |
+ records.add(toNdefRecord(message.data[i])); |
+ } |
+ records.add(NdefRecord.createExternal(DOMAIN, TYPE, message.url.getBytes("UTF-8"))); |
+ NdefRecord[] ndefRecords = new NdefRecord[records.size()]; |
+ records.toArray(ndefRecords); |
+ return new NdefMessage(ndefRecords); |
+ } catch (UnsupportedEncodingException | InvalidNfcMessageException |
+ | IllegalArgumentException e) { |
+ throw new InvalidNfcMessageException(); |
+ } |
+ } |
+ |
+ /** |
+ * Returns charset of mojo NfcRecord. Only applicable for URL and TEXT records. |
+ * If charset cannot be determined, UTF-8 charset is used by default. |
+ */ |
+ private static String getCharset(NfcRecord record) { |
+ if (record.mediaType.endsWith(CHARSET_UTF8)) return "UTF-8"; |
+ |
+ // When 16bit WTF::String data is converted to bytearray, it is in LE byte order, without |
+ // BOM. By default, Android interprets UTF-16 charset without BOM as UTF-16BE, thus, use |
+ // UTF-16LE as encoding for text data. |
+ |
+ if (record.mediaType.endsWith(CHARSET_UTF16)) return "UTF-16LE"; |
+ |
+ Log.w(TAG, "Unknown charset, defaulting to UTF-8."); |
+ return "UTF-8"; |
+ } |
+ |
+ /** |
+ * Converts mojo NfcRecord to android.nfc.NdefRecord |
+ */ |
+ private static NdefRecord toNdefRecord(NfcRecord record) throws InvalidNfcMessageException, |
+ IllegalArgumentException, |
+ UnsupportedEncodingException { |
+ switch (record.recordType) { |
+ case NfcRecordType.URL: |
+ return NdefRecord.createUri(new String(record.data, getCharset(record))); |
+ case NfcRecordType.TEXT: |
+ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { |
+ return NdefRecord.createTextRecord( |
+ "en-US", new String(record.data, getCharset(record))); |
+ } else { |
+ return NdefRecord.createMime(TEXT_MIME, record.data); |
+ } |
+ case NfcRecordType.JSON: |
+ case NfcRecordType.OPAQUE_RECORD: |
+ return NdefRecord.createMime(record.mediaType, record.data); |
+ default: |
+ throw new InvalidNfcMessageException(); |
+ } |
+ } |
+} |