The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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.drm.mobile1; |
| 18 | |
| 19 | import java.io.*; |
| 20 | |
| 21 | /** |
| 22 | * This class provides interfaces to access the DRM raw content. |
| 23 | */ |
| 24 | public class DrmRawContent { |
| 25 | /** |
| 26 | * The "application/vnd.oma.drm.message" mime type. |
| 27 | */ |
| 28 | public static final String DRM_MIMETYPE_MESSAGE_STRING = "application/vnd.oma.drm.message"; |
| 29 | |
| 30 | /** |
| 31 | * The "application/vnd.oma.drm.content" mime type. |
| 32 | */ |
| 33 | public static final String DRM_MIMETYPE_CONTENT_STRING = "application/vnd.oma.drm.content"; |
| 34 | |
| 35 | /** |
| 36 | * The DRM delivery type: Forward-Lock |
| 37 | */ |
| 38 | public static final int DRM_FORWARD_LOCK = 1; |
| 39 | |
| 40 | /** |
| 41 | * The DRM delivery type: Combined Delivery |
| 42 | */ |
| 43 | public static final int DRM_COMBINED_DELIVERY = 2; |
| 44 | |
| 45 | /** |
| 46 | * The DRM delivery type: Separate Delivery |
| 47 | */ |
| 48 | public static final int DRM_SEPARATE_DELIVERY = 3; |
| 49 | |
| 50 | /** |
| 51 | * The DRM delivery type: Separate Delivery in DRM message |
| 52 | */ |
| 53 | public static final int DRM_SEPARATE_DELIVERY_DM = 4; |
| 54 | |
| 55 | /** |
| 56 | * The DRM media content length is unknown currently |
| 57 | */ |
| 58 | public static final int DRM_UNKNOWN_DATA_LEN = -1; |
| 59 | |
| 60 | |
| 61 | /** |
| 62 | * The id of "application/vnd.oma.drm.message" mime type. |
| 63 | */ |
| 64 | private static final int DRM_MIMETYPE_MESSAGE = 1; |
| 65 | |
| 66 | /** |
| 67 | * The id of "application/vnd.oma.drm.content" mime type. |
| 68 | */ |
| 69 | private static final int DRM_MIMETYPE_CONTENT = 2; |
| 70 | |
| 71 | /** |
| 72 | * Successful operation. |
| 73 | */ |
| 74 | private static final int JNI_DRM_SUCCESS = 0; |
| 75 | |
| 76 | /** |
| 77 | * General failure. |
| 78 | */ |
| 79 | private static final int JNI_DRM_FAILURE = -1; |
| 80 | |
| 81 | /** |
| 82 | * Indicates the end of the DRM content is reached. |
| 83 | */ |
| 84 | private static final int JNI_DRM_EOF = -2; |
| 85 | |
| 86 | /** |
| 87 | * The media content length is unknown from native method |
| 88 | */ |
| 89 | private static final int JNI_DRM_UNKNOWN_DATA_LEN = -3; |
| 90 | |
| 91 | /** |
| 92 | * The member to save the original InputStream data. |
| 93 | */ |
| 94 | private BufferedInputStream inData; |
| 95 | |
| 96 | /** |
| 97 | * The member to save the original InputStream data length. |
| 98 | */ |
| 99 | private int inDataLen; |
| 100 | |
| 101 | /** |
| 102 | * The unique id to this DRM content. It will be initialized |
| 103 | * in constructor by native method. And it will not be changed |
| 104 | * after initialization. |
| 105 | */ |
| 106 | private int id; |
| 107 | |
| 108 | /** |
| 109 | * The rights issuer address of this DRM object. |
| 110 | */ |
| 111 | private String rightsIssuer; |
| 112 | |
| 113 | /** |
| 114 | * The media content type of this DRM object. |
| 115 | */ |
| 116 | private String mediaType; |
| 117 | |
| 118 | /** |
| 119 | * The delivery method type of this DRM object. |
| 120 | */ |
| 121 | private int rawType; |
| 122 | |
| 123 | |
| 124 | /** |
| 125 | * Construct a DrmRawContent object. |
| 126 | * |
| 127 | * @param inRawdata object of DRM raw data stream. |
| 128 | * @param len the length of raw data can be read. |
| 129 | * @param mimeTypeStr the mime type of the DRM content. |
| 130 | */ |
| 131 | public DrmRawContent(InputStream inRawdata, int len, String mimeTypeStr) throws DrmException, IOException { |
| 132 | int mimeType; |
| 133 | |
| 134 | id = -1; |
| 135 | inData = new BufferedInputStream(inRawdata, 1024); |
| 136 | inDataLen = len; |
| 137 | |
| 138 | if (DRM_MIMETYPE_MESSAGE_STRING.equals(mimeTypeStr)) |
| 139 | mimeType = DRM_MIMETYPE_MESSAGE; |
| 140 | else if (DRM_MIMETYPE_CONTENT_STRING.equals(mimeTypeStr)) |
| 141 | mimeType = DRM_MIMETYPE_CONTENT; |
| 142 | else |
| 143 | throw new IllegalArgumentException("mimeType must be DRM_MIMETYPE_MESSAGE or DRM_MIMETYPE_CONTENT"); |
| 144 | |
| 145 | if (len <= 0) |
| 146 | throw new IllegalArgumentException("len must be > 0"); |
| 147 | |
| 148 | /* call native method to initialize this DRM content */ |
| 149 | id = nativeConstructDrmContent(inData, inDataLen, mimeType); |
| 150 | |
| 151 | if (JNI_DRM_FAILURE == id) |
| 152 | throw new DrmException("nativeConstructDrmContent() returned JNI_DRM_FAILURE"); |
| 153 | |
| 154 | /* init the rights issuer field. */ |
| 155 | rightsIssuer = nativeGetRightsAddress(); |
| 156 | |
| 157 | /* init the raw content type. */ |
| 158 | rawType = nativeGetDeliveryMethod(); |
| 159 | if (JNI_DRM_FAILURE == rawType) |
| 160 | throw new DrmException("nativeGetDeliveryMethod() returned JNI_DRM_FAILURE"); |
| 161 | |
| 162 | /* init the media content type. */ |
| 163 | mediaType = nativeGetContentType(); |
| 164 | if (null == mediaType) |
| 165 | throw new DrmException("nativeGetContentType() returned null"); |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Get rights address from raw Seperate Delivery content. |
| 170 | * |
| 171 | * @return the string of the rights issuer address, |
| 172 | * or null if no rights issuer. |
| 173 | */ |
| 174 | public String getRightsAddress() { |
| 175 | return rightsIssuer; |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Get the type of the raw DRM content. |
| 180 | * |
| 181 | * @return one of the following delivery type of this DRM content: |
| 182 | * #DRM_FORWARD_LOCK |
| 183 | * #DRM_COMBINED_DELIVERY |
| 184 | * #DRM_SEPARATE_DELIVERY |
| 185 | * #DRM_SEPARATE_DELIVERY_DM |
| 186 | */ |
| 187 | public int getRawType() { |
| 188 | return rawType; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Get one InputStream object to read decrypted content. |
| 193 | * |
| 194 | * @param rights the rights object contain decrypted key. |
| 195 | * |
| 196 | * @return the InputStream object of decrypted media content. |
| 197 | */ |
| 198 | public InputStream getContentInputStream(DrmRights rights) { |
| 199 | if (null == rights) |
| 200 | throw new NullPointerException(); |
| 201 | |
| 202 | return new DrmInputStream(rights); |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Get the type of the decrypted media content. |
| 207 | * |
| 208 | * @return the decrypted media content type of this DRM content. |
| 209 | */ |
| 210 | public String getContentType() { |
| 211 | return mediaType; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Get the length of the decrypted media content. |
| 216 | * |
| 217 | * @param rights the rights object contain decrypted key. |
| 218 | * |
| 219 | * @return the length of the decrypted media content. |
| 220 | * #DRM_UNKNOWN_DATA_LEN if the length is unknown currently. |
| 221 | */ |
| 222 | public int getContentLength(DrmRights rights) throws DrmException { |
| 223 | /** |
| 224 | * Because currently the media object associate with rights object |
| 225 | * has been handled in native logic, so here it is not need to deal |
| 226 | * the rights. But for the apps, it is mandatory for user to get |
| 227 | * the rights object before get the media content length. |
| 228 | */ |
| 229 | if (null == rights) |
| 230 | throw new NullPointerException(); |
| 231 | |
| 232 | int mediaLen = nativeGetContentLength(); |
| 233 | |
| 234 | if (JNI_DRM_FAILURE == mediaLen) |
| 235 | throw new DrmException("nativeGetContentLength() returned JNI_DRM_FAILURE"); |
| 236 | |
| 237 | if (JNI_DRM_UNKNOWN_DATA_LEN == mediaLen) |
| 238 | return DRM_UNKNOWN_DATA_LEN; |
| 239 | |
| 240 | return mediaLen; |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * This class provide a InputStream to the DRM media content. |
| 245 | */ |
| 246 | class DrmInputStream extends InputStream |
| 247 | { |
| 248 | /** |
| 249 | * The flag to indicate whether this stream is closed or not. |
| 250 | */ |
| 251 | private boolean isClosed; |
| 252 | |
| 253 | /** |
| 254 | * The offset of this DRM content to be reset. |
| 255 | */ |
| 256 | private int offset; |
| 257 | |
| 258 | /** |
| 259 | * A byte of data to be readed. |
| 260 | */ |
| 261 | private byte[] b; |
| 262 | |
| 263 | /** |
| 264 | * Construct a DrmInputStream instance. |
| 265 | */ |
| 266 | public DrmInputStream(DrmRights rights) { |
| 267 | /** |
| 268 | * Because currently the media object associate with rights object |
| 269 | * has been handled in native logic, so here it is not need to deal |
| 270 | * the rights. But for the apps, it is mandatory for user to get |
| 271 | * the rights object before get the media content data. |
| 272 | */ |
| 273 | |
| 274 | isClosed = false; |
| 275 | offset = 0; |
| 276 | b = new byte[1]; |
| 277 | } |
| 278 | |
| 279 | /* Non-javadoc |
| 280 | * @see java.io.InputStream#available() |
| 281 | */ |
| 282 | public int available() throws IOException { |
| 283 | /* call native method to get this DRM decrypted media content length */ |
| 284 | int len = nativeGetContentLength(); |
| 285 | |
| 286 | if (JNI_DRM_FAILURE == len) |
| 287 | throw new IOException(); |
| 288 | |
| 289 | /* if the length is unknown, just return 0 for available value */ |
| 290 | if (JNI_DRM_UNKNOWN_DATA_LEN == len) |
| 291 | return 0; |
| 292 | |
| 293 | int availableLen = len - offset; |
| 294 | if (availableLen < 0) |
| 295 | throw new IOException(); |
| 296 | |
| 297 | return availableLen; |
| 298 | } |
| 299 | |
| 300 | /* Non-javadoc |
| 301 | * @see java.io.InputStream#read() |
| 302 | */ |
| 303 | public int read() throws IOException { |
| 304 | int res; |
| 305 | |
| 306 | res = read(b, 0, 1); |
| 307 | |
| 308 | if (-1 == res) |
| 309 | return -1; |
| 310 | |
| 311 | return b[0] & 0xff; |
| 312 | } |
| 313 | |
| 314 | /* Non-javadoc |
| 315 | * @see java.io.InputStream#read(byte) |
| 316 | */ |
| 317 | public int read(byte[] b) throws IOException { |
| 318 | return read(b, 0, b.length); |
| 319 | } |
| 320 | |
| 321 | /* Non-javadoc |
| 322 | * @see java.io.InputStream#read(byte, int, int) |
| 323 | */ |
| 324 | public int read(byte[] b, int off, int len) throws IOException { |
| 325 | if (null == b) |
| 326 | throw new NullPointerException(); |
| 327 | if (off < 0 || len < 0 || off + len > b.length) |
| 328 | throw new IndexOutOfBoundsException(); |
| 329 | if (true == isClosed) |
| 330 | throw new IOException(); |
| 331 | |
| 332 | if (0 == len) |
| 333 | return 0; |
| 334 | |
| 335 | len = nativeReadContent(b, off, len, offset); |
| 336 | |
| 337 | if (JNI_DRM_FAILURE == len) |
| 338 | throw new IOException(); |
| 339 | else if (JNI_DRM_EOF == len) |
| 340 | return -1; |
| 341 | |
| 342 | offset += len; |
| 343 | |
| 344 | return len; |
| 345 | } |
| 346 | |
| 347 | /* Non-javadoc |
| 348 | * @see java.io.InputStream#markSupported() |
| 349 | */ |
| 350 | public boolean markSupported() { |
| 351 | return false; |
| 352 | } |
| 353 | |
| 354 | /* Non-javadoc |
| 355 | * @see java.io.InputStream#mark(int) |
| 356 | */ |
| 357 | public void mark(int readlimit) { |
| 358 | } |
| 359 | |
| 360 | /* Non-javadoc |
| 361 | * @see java.io.InputStream#reset() |
| 362 | */ |
| 363 | public void reset() throws IOException { |
| 364 | throw new IOException(); |
| 365 | } |
| 366 | |
| 367 | /* Non-javadoc |
| 368 | * @see java.io.InputStream#skip() |
| 369 | */ |
| 370 | public long skip(long n) throws IOException { |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | /* Non-javadoc |
| 375 | * @see java.io.InputStream#close() |
| 376 | */ |
| 377 | public void close() { |
| 378 | isClosed = true; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | /** |
| 383 | * native method: construct a DRM content according the mime type. |
| 384 | * |
| 385 | * @param data input DRM content data to be parsed. |
| 386 | * @param len the length of the data. |
| 387 | * @param mimeType the mime type of this DRM content. the value of this field includes: |
| 388 | * #DRM_MIMETYPE_MESSAGE |
| 389 | * #DRM_MIMETYPE_CONTENT |
| 390 | * |
| 391 | * @return #the id of the DRM content if succeed. |
| 392 | * #JNI_DRM_FAILURE if fail. |
| 393 | */ |
| 394 | private native int nativeConstructDrmContent(InputStream data, int len, int mimeType); |
| 395 | |
| 396 | /** |
| 397 | * native method: get this DRM content rights issuer. |
| 398 | * |
| 399 | * @return the address of rights issuer if in case of separate delivery. |
| 400 | * null if not separete delivery, or otherwise. |
| 401 | */ |
| 402 | private native String nativeGetRightsAddress(); |
| 403 | |
| 404 | /** |
| 405 | * native method: get this DRM content delivery type. |
| 406 | * |
| 407 | * @return the delivery method, the value may be one of the following: |
| 408 | * #DRM_FORWARD_LOCK |
| 409 | * #DRM_COMBINED_DELIVERY |
| 410 | * #DRM_SEPARATE_DELIVERY |
| 411 | * #DRM_SEPARATE_DELIVERY_DM |
| 412 | * #JNI_DRM_FAILURE if fail. |
| 413 | */ |
| 414 | private native int nativeGetDeliveryMethod(); |
| 415 | |
| 416 | /** |
| 417 | * native method: get a piece of media content data. |
| 418 | * |
| 419 | * @param buf the buffer to save DRM media content data. |
| 420 | * @param bufOff the offset of the buffer to start to save data. |
| 421 | * @param len the number of byte to read. |
| 422 | * @param mediaOff the offset of the media content data to start to read. |
| 423 | * |
| 424 | * @return the length of the media content data has been read. |
| 425 | * #JNI_DRM_EOF if reach to end of the media content. |
| 426 | * #JNI_DRM_FAILURE if fail. |
| 427 | */ |
| 428 | private native int nativeReadContent(byte[] buf, int bufOff, int len, int mediaOff); |
| 429 | |
| 430 | /** |
| 431 | * native method: get this DRM content type. |
| 432 | * |
| 433 | * @return the decrypted media content type. |
| 434 | * null if fail. |
| 435 | */ |
| 436 | private native String nativeGetContentType(); |
| 437 | |
| 438 | /** |
| 439 | * native method: get this DRM decrypted media content length. |
| 440 | * |
| 441 | * @return the length of decrypted media content. |
| 442 | * #JNI_DRM_FAILURE if fail. |
| 443 | * #JNI_DRM_UNKNOWN_DATA_LEN if the length is unknown currently. |
| 444 | */ |
| 445 | private native int nativeGetContentLength(); |
| 446 | |
| 447 | /** |
| 448 | * The finalizer of the DRMRawContent. Do some cleanup. |
| 449 | */ |
| 450 | protected native void finalize(); |
| 451 | |
| 452 | |
| 453 | /** |
| 454 | * Load the shared library to link the native methods. |
| 455 | */ |
| 456 | static { |
| 457 | try { |
| 458 | System.loadLibrary("drm1_jni"); |
| 459 | } |
| 460 | catch (UnsatisfiedLinkError ule) { |
| 461 | System.err.println("WARNING: Could not load libdrm1_jni.so"); |
| 462 | } |
| 463 | } |
| 464 | } |