Move NDEF URI helper method into android.nfc.NfcRecord
Change-Id: Ia044e45cbe2cd06c4844d15a57f1c1f392cf65cd
diff --git a/core/java/android/nfc/NdefRecord.java b/core/java/android/nfc/NdefRecord.java
index fe215fd..3fd26dd 100644
--- a/core/java/android/nfc/NdefRecord.java
+++ b/core/java/android/nfc/NdefRecord.java
@@ -16,10 +16,13 @@
package android.nfc;
+import android.net.Uri;
import android.os.Parcel;
import android.os.Parcelable;
import java.lang.UnsupportedOperationException;
+import java.nio.charset.Charsets;
+import java.util.Arrays;
/**
* Represents a logical (unchunked) NDEF (NFC Data Exchange Format) record.
@@ -142,6 +145,50 @@
private static final byte FLAG_SR = (byte) 0x10;
private static final byte FLAG_IL = (byte) 0x08;
+ /**
+ * NFC Forum "URI Record Type Definition"
+ *
+ * This is a mapping of "URI Identifier Codes" to URI string prefixes,
+ * per section 3.2.2 of the NFC Forum URI Record Type Definition document.
+ */
+ private static final String[] URI_PREFIX_MAP = new String[] {
+ "", // 0x00
+ "http://www.", // 0x01
+ "https://www.", // 0x02
+ "http://", // 0x03
+ "https://", // 0x04
+ "tel:", // 0x05
+ "mailto:", // 0x06
+ "ftp://anonymous:anonymous@", // 0x07
+ "ftp://ftp.", // 0x08
+ "ftps://", // 0x09
+ "sftp://", // 0x0A
+ "smb://", // 0x0B
+ "nfs://", // 0x0C
+ "ftp://", // 0x0D
+ "dav://", // 0x0E
+ "news:", // 0x0F
+ "telnet://", // 0x10
+ "imap:", // 0x11
+ "rtsp://", // 0x12
+ "urn:", // 0x13
+ "pop:", // 0x14
+ "sip:", // 0x15
+ "sips:", // 0x16
+ "tftp:", // 0x17
+ "btspp://", // 0x18
+ "btl2cap://", // 0x19
+ "btgoep://", // 0x1A
+ "tcpobex://", // 0x1B
+ "irdaobex://", // 0x1C
+ "file://", // 0x1D
+ "urn:epc:id:", // 0x1E
+ "urn:epc:tag:", // 0x1F
+ "urn:epc:pat:", // 0x20
+ "urn:epc:raw:", // 0x21
+ "urn:epc:", // 0x22
+ };
+
private final byte mFlags;
private final short mTnf;
private final byte[] mType;
@@ -256,6 +303,50 @@
}
/**
+ * Helper to return the NdefRecord as a URI.
+ * TODO: Consider making a member method instead of static
+ * TODO: Consider more validation that this is a URI record
+ * TODO: Make a public API
+ * @hide
+ */
+ public static Uri parseWellKnownUriRecord(NdefRecord record) throws FormatException {
+ byte[] payload = record.getPayload();
+ if (payload.length < 2) {
+ throw new FormatException("Payload is not a valid URI (missing prefix)");
+ }
+
+ /*
+ * payload[0] contains the URI Identifier Code, per the
+ * NFC Forum "URI Record Type Definition" section 3.2.2.
+ *
+ * payload[1]...payload[payload.length - 1] contains the rest of
+ * the URI.
+ */
+ int prefixIndex = (payload[0] & 0xff);
+ if (prefixIndex < 0 || prefixIndex >= URI_PREFIX_MAP.length) {
+ throw new FormatException("Payload is not a valid URI (invalid prefix)");
+ }
+ String prefix = URI_PREFIX_MAP[prefixIndex];
+ byte[] fullUri = concat(prefix.getBytes(Charsets.UTF_8),
+ Arrays.copyOfRange(payload, 1, payload.length));
+ return Uri.parse(new String(fullUri, Charsets.UTF_8));
+ }
+
+ private static byte[] concat(byte[]... arrays) {
+ int length = 0;
+ for (byte[] array : arrays) {
+ length += array.length;
+ }
+ byte[] result = new byte[length];
+ int pos = 0;
+ for (byte[] array : arrays) {
+ System.arraycopy(array, 0, result, pos, array.length);
+ pos += array.length;
+ }
+ return result;
+ }
+
+ /**
* Returns this entire NDEF Record as a byte array.
*/
public byte[] toByteArray() {