Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 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 |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 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. |
| 15 | */ |
| 16 | |
| 17 | package android.nfc; |
| 18 | |
| 19 | import android.os.Parcel; |
| 20 | import android.os.Parcelable; |
| 21 | |
| 22 | import java.lang.UnsupportedOperationException; |
| 23 | |
| 24 | /** |
| 25 | * NDEF Record data. |
| 26 | * <p> |
| 27 | * Immutable data class. An NDEF record always contains |
| 28 | * <ul> |
| 29 | * <li>3-bit TNF field |
| 30 | * <li>Variable length type |
| 31 | * <li>Variable length ID |
| 32 | * <li>Variable length payload |
| 33 | * </ul> |
| 34 | * The TNF (Type Name Format) field indicates how to interpret the type field. |
| 35 | * <p> |
| 36 | * This class represents a logical (unchunked) NDEF record. The underlying |
| 37 | * representation may be chunked across several NDEF records when the payload is |
| 38 | * large. |
| 39 | */ |
| 40 | public class NdefRecord implements Parcelable { |
| 41 | /** |
| 42 | * Indicates no type, id, or payload is associated with this NDEF Record. |
| 43 | * <p> |
| 44 | * Type, id and payload fields must all be empty to be a valid TNF_EMPTY |
| 45 | * record. |
| 46 | */ |
| 47 | public static final short TNF_EMPTY = 0x00; |
| 48 | |
| 49 | /** |
| 50 | * Indicates the type field uses the RTD type name format. |
| 51 | * <p> |
| 52 | * Use this TNF with RTD types such as RTD_TEXT, RTD_URI. |
| 53 | */ |
| 54 | public static final short TNF_WELL_KNOWN = 0x01; |
| 55 | |
| 56 | /** |
| 57 | * Indicates the type field contains a value that follows the media-type BNF |
| 58 | * construct defined by RFC 2046. |
| 59 | */ |
| 60 | public static final short TNF_MIME_MEDIA = 0x02; |
| 61 | |
| 62 | /** |
| 63 | * Indicates the type field contains a value that follows the absolute-URI |
| 64 | * BNF construct defined by RFC 3986. |
| 65 | */ |
| 66 | public static final short TNF_ABSOLUTE_URI = 0x03; |
| 67 | |
| 68 | /** |
| 69 | * Indicates the type field contains a value that follows the RTD external |
| 70 | * name specification. |
| 71 | * <p> |
| 72 | * Note this TNF should not be used with RTD_TEXT or RTD_URI constants. |
| 73 | * Those are well known RTD constants, not external RTD constants. |
| 74 | */ |
| 75 | public static final short TNF_EXTERNAL_TYPE = 0x04; |
| 76 | |
| 77 | /** |
| 78 | * Indicates the payload type is unknown. |
| 79 | * <p> |
| 80 | * This is similar to the "application/octet-stream" MIME type. The payload |
| 81 | * type is not explicitly encoded within the NDEF Message. |
| 82 | * <p> |
| 83 | * The type field must be empty to be a valid TNF_UNKNOWN record. |
| 84 | */ |
| 85 | public static final short TNF_UNKNOWN = 0x05; |
| 86 | |
| 87 | /** |
| 88 | * Indicates the payload is an intermediate or final chunk of a chunked |
| 89 | * NDEF Record. |
| 90 | * <p> |
| 91 | * The payload type is specified in the first chunk, and subsequent chunks |
| 92 | * must use TNF_UNCHANGED with an empty type field. TNF_UNCHANGED must not |
| 93 | * be used in any other situation. |
| 94 | */ |
| 95 | public static final short TNF_UNCHANGED = 0x06; |
| 96 | |
| 97 | /** |
| 98 | * Reserved TNF type. |
| 99 | * <p> |
| 100 | * The NFC Forum NDEF Specification v1.0 suggests for NDEF parsers to treat this |
| 101 | * value like TNF_UNKNOWN. |
| 102 | * @hide |
| 103 | */ |
| 104 | public static final short TNF_RESERVED = 0x07; |
| 105 | |
| 106 | /** |
| 107 | * RTD Text type. For use with TNF_WELL_KNOWN. |
| 108 | */ |
| 109 | public static final byte[] RTD_TEXT = {0x54}; // "T" |
| 110 | |
| 111 | /** |
| 112 | * RTD URI type. For use with TNF_WELL_KNOWN. |
| 113 | */ |
| 114 | public static final byte[] RTD_URI = {0x55}; // "U" |
| 115 | |
| 116 | /** |
| 117 | * RTD Smart Poster type. For use with TNF_WELL_KNOWN. |
| 118 | */ |
| 119 | public static final byte[] RTD_SMART_POSTER = {0x53, 0x70}; // "Sp" |
| 120 | |
| 121 | /** |
| 122 | * RTD Alternative Carrier type. For use with TNF_WELL_KNOWN. |
| 123 | */ |
| 124 | public static final byte[] RTD_ALTERNATIVE_CARRIER = {0x61, 0x63}; // "ac" |
| 125 | |
| 126 | /** |
| 127 | * RTD Handover Carrier type. For use with TNF_WELL_KNOWN. |
| 128 | */ |
| 129 | public static final byte[] RTD_HANDOVER_CARRIER = {0x48, 0x63}; // "Hc" |
| 130 | |
| 131 | /** |
| 132 | * RTD Handover Request type. For use with TNF_WELL_KNOWN. |
| 133 | */ |
| 134 | public static final byte[] RTD_HANDOVER_REQUEST = {0x48, 0x72}; // "Hr" |
| 135 | |
| 136 | /** |
| 137 | * RTD Handover Select type. For use with TNF_WELL_KNOWN. |
| 138 | */ |
| 139 | public static final byte[] RTD_HANDOVER_SELECT = {0x48, 0x73}; // "Hs" |
| 140 | |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 141 | private static final byte FLAG_MB = (byte) 0x80; |
| 142 | private static final byte FLAG_ME = (byte) 0x40; |
| 143 | private static final byte FLAG_CF = (byte) 0x20; |
| 144 | private static final byte FLAG_SR = (byte) 0x10; |
| 145 | private static final byte FLAG_IL = (byte) 0x08; |
| 146 | |
| 147 | private final byte mFlags; |
| 148 | private final short mTnf; |
| 149 | private final byte[] mType; |
| 150 | private final byte[] mId; |
| 151 | private final byte[] mPayload; |
| 152 | |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 153 | /** |
| 154 | * Construct an NDEF Record. |
| 155 | * <p> |
| 156 | * Applications should not attempt to manually chunk NDEF Records - the |
| 157 | * implementation of android.nfc will automatically chunk an NDEF Record |
| 158 | * when necessary (and only present a single logical NDEF Record to the |
| 159 | * application). So applications should not use TNF_UNCHANGED. |
| 160 | * |
| 161 | * @param tnf a 3-bit TNF constant |
| 162 | * @param type byte array, containing zero to 255 bytes, must not be null |
| 163 | * @param id byte array, containing zero to 255 bytes, must not be null |
| 164 | * @param payload byte array, containing zero to (2 ** 32 - 1) bytes, |
| 165 | * must not be null |
| 166 | */ |
| 167 | public NdefRecord(short tnf, byte[] type, byte[] id, byte[] payload) { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 168 | /* check arguments */ |
| 169 | if ((type == null) || (id == null) || (payload == null)) { |
| 170 | throw new IllegalArgumentException("Illegal null argument"); |
| 171 | } |
| 172 | |
| 173 | /* generate flag */ |
| 174 | byte flags = FLAG_MB | FLAG_ME; |
| 175 | |
| 176 | /* Determine if it is a short record */ |
| 177 | if(payload.length < 0xFF) { |
| 178 | flags |= FLAG_SR; |
| 179 | } |
| 180 | |
| 181 | /* Determine if an id is present */ |
| 182 | if(id.length != 0) { |
| 183 | flags |= FLAG_IL; |
| 184 | } |
| 185 | |
| 186 | mFlags = flags; |
| 187 | mTnf = tnf; |
| 188 | mType = type.clone(); |
| 189 | mId = id.clone(); |
| 190 | mPayload = payload.clone(); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Construct an NDEF Record from raw bytes. |
| 195 | * <p> |
| 196 | * Validation is performed to make sure the header is valid, and that |
| 197 | * the id, type and payload sizes appear to be valid. |
| 198 | * |
| 199 | * @throws FormatException if the data is not a valid NDEF record |
| 200 | */ |
| 201 | public NdefRecord(byte[] data) { |
| 202 | throw new UnsupportedOperationException(); |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Returns the 3-bit TNF. |
| 207 | * <p> |
| 208 | * TNF is the top-level type. |
| 209 | */ |
| 210 | public short getTnf() { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 211 | return mTnf; |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Returns the variable length Type field. |
| 216 | * <p> |
| 217 | * This should be used in conjunction with the TNF field to determine the |
| 218 | * payload format. |
| 219 | */ |
| 220 | public byte[] getType() { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 221 | return mType.clone(); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Returns the variable length ID. |
| 226 | */ |
| 227 | public byte[] getId() { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 228 | return mId.clone(); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Returns the variable length payload. |
| 233 | */ |
| 234 | public byte[] getPayload() { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 235 | return mPayload.clone(); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Return this NDEF Record as a byte array. |
| 240 | * @hide |
| 241 | */ |
| 242 | public byte[] toByteArray() { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 243 | return generate(mFlags, mTnf, mType, mId, mPayload); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 244 | } |
| 245 | |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 246 | public int describeContents() { |
| 247 | return 0; |
| 248 | } |
| 249 | |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 250 | public void writeToParcel(Parcel dest, int flags) { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 251 | dest.writeInt(mTnf); |
| 252 | dest.writeInt(mType.length); |
| 253 | dest.writeByteArray(mType); |
| 254 | dest.writeInt(mId.length); |
| 255 | dest.writeByteArray(mId); |
| 256 | dest.writeInt(mPayload.length); |
| 257 | dest.writeByteArray(mPayload); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | public static final Parcelable.Creator<NdefRecord> CREATOR = |
| 261 | new Parcelable.Creator<NdefRecord>() { |
| 262 | public NdefRecord createFromParcel(Parcel in) { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 263 | short tnf = (short)in.readInt(); |
| 264 | int typeLength = in.readInt(); |
| 265 | byte[] type = new byte[typeLength]; |
| 266 | in.readByteArray(type); |
| 267 | int idLength = in.readInt(); |
| 268 | byte[] id = new byte[idLength]; |
| 269 | in.readByteArray(id); |
| 270 | int payloadLength = in.readInt(); |
| 271 | byte[] payload = new byte[payloadLength]; |
| 272 | in.readByteArray(payload); |
| 273 | |
| 274 | return new NdefRecord(tnf, type, id, payload); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 275 | } |
| 276 | public NdefRecord[] newArray(int size) { |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 277 | return new NdefRecord[size]; |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 278 | } |
| 279 | }; |
Nick Pelly | 590b73b | 2010-10-12 13:00:50 -0700 | [diff] [blame^] | 280 | |
| 281 | private native byte[] generate(short flags, short tnf, byte[] type, byte[] id, byte[] data); |
Nick Pelly | dc99379 | 2010-10-04 11:17:25 -0700 | [diff] [blame] | 282 | } |