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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 package org.chromium.mojo.bindings; | |
| 6 | |
| 7 import org.chromium.mojo.bindings.Interface.Proxy; | |
| 8 import org.chromium.mojo.system.DataPipe; | |
| 9 import org.chromium.mojo.system.Handle; | |
| 10 import org.chromium.mojo.system.InvalidHandle; | |
| 11 import org.chromium.mojo.system.MessagePipeHandle; | |
| 12 import org.chromium.mojo.system.SharedBufferHandle; | |
| 13 import org.chromium.mojo.system.UntypedHandle; | |
| 14 | |
| 15 import java.nio.ByteOrder; | |
| 16 import java.nio.charset.Charset; | |
| 17 | |
| 18 /** | |
| 19 * A Decoder is a helper class for deserializing a mojo struct. It enables deser
ialization of basic | |
| 20 * types from a {@link Message} object at a given offset into it's byte buffer. | |
| 21 */ | |
| 22 public class Decoder { | |
| 23 | |
| 24 /** | |
| 25 * Helper class to validate the decoded message. | |
| 26 */ | |
| 27 static final class Validator { | |
| 28 | |
| 29 /** | |
| 30 * Minimal value for the next handle to deserialize. | |
| 31 */ | |
| 32 private int mMinNextClaimedHandle = 0; | |
| 33 /** | |
| 34 * Minimal value of the start of the next memory to claim. | |
| 35 */ | |
| 36 private long mMinNextMemory = 0; | |
| 37 | |
| 38 /** | |
| 39 * The maximal memory accessible. | |
| 40 */ | |
| 41 private final long mMaxMemory; | |
| 42 | |
| 43 /** | |
| 44 * The number of handles in the message. | |
| 45 */ | |
| 46 private final long mNumberOfHandles; | |
| 47 | |
| 48 /** | |
| 49 * Constructor. | |
| 50 */ | |
| 51 Validator(long maxMemory, int numberOfHandles) { | |
| 52 mMaxMemory = maxMemory; | |
| 53 mNumberOfHandles = numberOfHandles; | |
| 54 } | |
| 55 | |
| 56 public void claimHandle(int handle) { | |
| 57 if (handle < mMinNextClaimedHandle) { | |
| 58 throw new DeserializationException( | |
| 59 "Trying to access handle out of order."); | |
| 60 } | |
| 61 if (handle >= mNumberOfHandles) { | |
| 62 throw new DeserializationException("Trying to access non present
handle."); | |
| 63 } | |
| 64 mMinNextClaimedHandle = handle + 1; | |
| 65 } | |
| 66 | |
| 67 public void claimMemory(long start, long end) { | |
| 68 if (start % BindingsHelper.ALIGNMENT != 0) { | |
| 69 throw new DeserializationException("Incorrect starting alignment
: " + start + "."); | |
| 70 } | |
| 71 if (start < mMinNextMemory) { | |
| 72 throw new DeserializationException("Trying to access memory out
of order."); | |
| 73 } | |
| 74 if (end < start) { | |
| 75 throw new DeserializationException("Incorrect memory range."); | |
| 76 } | |
| 77 if (end > mMaxMemory) { | |
| 78 throw new DeserializationException("Trying to access out of rang
e memory."); | |
| 79 } | |
| 80 mMinNextMemory = BindingsHelper.align(end); | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 /** | |
| 85 * The message to deserialize from. | |
| 86 */ | |
| 87 private final Message mMessage; | |
| 88 | |
| 89 /** | |
| 90 * The base offset in the byte buffer. | |
| 91 */ | |
| 92 private final int mBaseOffset; | |
| 93 | |
| 94 /** | |
| 95 * Validator for the decoded message. | |
| 96 */ | |
| 97 private final Validator mValidator; | |
| 98 | |
| 99 /** | |
| 100 * Constructor. | |
| 101 * | |
| 102 * @param message The message to decode. | |
| 103 */ | |
| 104 public Decoder(Message message) { | |
| 105 this(message, new Validator(message.getData().limit(), message.getHandle
s().size()), 0); | |
| 106 } | |
| 107 | |
| 108 private Decoder(Message message, Validator validator, int baseOffset) { | |
| 109 mMessage = message; | |
| 110 mMessage.getData().order(ByteOrder.LITTLE_ENDIAN); | |
| 111 mBaseOffset = baseOffset; | |
| 112 mValidator = validator; | |
| 113 } | |
| 114 | |
| 115 /** | |
| 116 * Deserializes a {@link DataHeader} at the current position. | |
| 117 */ | |
| 118 public DataHeader readDataHeader() { | |
| 119 // Claim the memory for the header. | |
| 120 mValidator.claimMemory(mBaseOffset, mBaseOffset + DataHeader.HEADER_SIZE
); | |
| 121 DataHeader result = readDataHeaderAtOffset(0, false); | |
| 122 // Claim the rest of the memory. | |
| 123 mValidator.claimMemory(mBaseOffset + DataHeader.HEADER_SIZE, mBaseOffset
+ result.size); | |
| 124 return result; | |
| 125 } | |
| 126 | |
| 127 /** | |
| 128 * Deserializes a {@link DataHeader} for an union at the given offset. | |
| 129 */ | |
| 130 public DataHeader readDataHeaderForUnion(int offset) { | |
| 131 DataHeader result = readDataHeaderAtOffset(offset, true); | |
| 132 if (result.size == 0) { | |
| 133 if (result.elementsOrVersion != 0) { | |
| 134 throw new DeserializationException( | |
| 135 "Unexpected version tag for a null union. Expecting 0, f
ound: " | |
| 136 + result.elementsOrVersion); | |
| 137 } | |
| 138 } else if (result.size != BindingsHelper.UNION_SIZE) { | |
| 139 throw new DeserializationException( | |
| 140 "Unexpected size of an union. The size must be 0 for a null
union, or 16 for " | |
| 141 + "a non-null union."); | |
| 142 } | |
| 143 return result; | |
| 144 } | |
| 145 | |
| 146 /** | |
| 147 * @returns a decoder suitable to decode an union defined as the root object
of a message. | |
| 148 */ | |
| 149 public Decoder decoderForSerializedUnion() { | |
| 150 mValidator.claimMemory(0, BindingsHelper.UNION_SIZE); | |
| 151 return this; | |
| 152 } | |
| 153 | |
| 154 /** | |
| 155 * Deserializes a {@link DataHeader} at the given offset. | |
| 156 */ | |
| 157 private DataHeader readDataHeaderAtOffset(int offset, boolean isUnion) { | |
| 158 int size = readInt(offset + DataHeader.SIZE_OFFSET); | |
| 159 int elementsOrVersion = readInt(offset + DataHeader.ELEMENTS_OR_VERSION_
OFFSET); | |
| 160 if (size < 0) { | |
| 161 throw new DeserializationException( | |
| 162 "Negative size. Unsigned integers are not valid for java."); | |
| 163 } | |
| 164 if (elementsOrVersion < 0 && (!isUnion || elementsOrVersion != -1)) { | |
| 165 throw new DeserializationException( | |
| 166 "Negative elements or version. Unsigned integers are not val
id for java."); | |
| 167 } | |
| 168 | |
| 169 return new DataHeader(size, elementsOrVersion); | |
| 170 } | |
| 171 | |
| 172 public DataHeader readAndValidateDataHeader(DataHeader[] versionArray) { | |
| 173 DataHeader header = readDataHeader(); | |
| 174 int maxVersionIndex = versionArray.length - 1; | |
| 175 if (header.elementsOrVersion <= versionArray[maxVersionIndex].elementsOr
Version) { | |
| 176 DataHeader referenceHeader = null; | |
| 177 for (int index = maxVersionIndex; index >= 0; index--) { | |
| 178 DataHeader dataHeader = versionArray[index]; | |
| 179 if (header.elementsOrVersion >= dataHeader.elementsOrVersion) { | |
| 180 referenceHeader = dataHeader; | |
| 181 break; | |
| 182 } | |
| 183 } | |
| 184 if (referenceHeader == null || referenceHeader.size != header.size)
{ | |
| 185 throw new DeserializationException( | |
| 186 "Header doesn't correspond to any known version."); | |
| 187 } | |
| 188 } else { | |
| 189 if (header.size < versionArray[maxVersionIndex].size) { | |
| 190 throw new DeserializationException("Message newer than the last
known version" | |
| 191 + " cannot be shorter than required by the last known ve
rsion."); | |
| 192 } | |
| 193 } | |
| 194 return header; | |
| 195 } | |
| 196 | |
| 197 /** | |
| 198 * Deserializes a {@link DataHeader} at the given offset and checks if it is
correct for an | |
| 199 * array where elements are pointers. | |
| 200 */ | |
| 201 public DataHeader readDataHeaderForPointerArray(int expectedLength) { | |
| 202 return readDataHeaderForArray(BindingsHelper.POINTER_SIZE, expectedLengt
h); | |
| 203 } | |
| 204 | |
| 205 /** | |
| 206 * Deserializes a {@link DataHeader} at the given offset and checks if it is
correct for an | |
| 207 * array where elements are unions. | |
| 208 */ | |
| 209 public DataHeader readDataHeaderForUnionArray(int expectedLength) { | |
| 210 return readDataHeaderForArray(BindingsHelper.UNION_SIZE, expectedLength)
; | |
| 211 } | |
| 212 | |
| 213 /** | |
| 214 * Deserializes a {@link DataHeader} at the given offset and checks if it is
correct for a map. | |
| 215 */ | |
| 216 public void readDataHeaderForMap() { | |
| 217 DataHeader si = readDataHeader(); | |
| 218 if (si.size != BindingsHelper.MAP_STRUCT_HEADER.size) { | |
| 219 throw new DeserializationException( | |
| 220 "Incorrect header for map. The size is incorrect."); | |
| 221 } | |
| 222 if (si.elementsOrVersion != BindingsHelper.MAP_STRUCT_HEADER.elementsOrV
ersion) { | |
| 223 throw new DeserializationException( | |
| 224 "Incorrect header for map. The version is incorrect."); | |
| 225 } | |
| 226 } | |
| 227 | |
| 228 /** | |
| 229 * Deserializes a byte at the given offset. | |
| 230 */ | |
| 231 public byte readByte(int offset) { | |
| 232 validateBufferSize(offset, 1); | |
| 233 return mMessage.getData().get(mBaseOffset + offset); | |
| 234 } | |
| 235 | |
| 236 /** | |
| 237 * Deserializes a boolean at the given offset, re-using any partially read b
yte. | |
| 238 */ | |
| 239 public boolean readBoolean(int offset, int bit) { | |
| 240 validateBufferSize(offset, 1); | |
| 241 return (readByte(offset) & (1 << bit)) != 0; | |
| 242 } | |
| 243 | |
| 244 /** | |
| 245 * Deserializes a short at the given offset. | |
| 246 */ | |
| 247 public short readShort(int offset) { | |
| 248 validateBufferSize(offset, 2); | |
| 249 return mMessage.getData().getShort(mBaseOffset + offset); | |
| 250 } | |
| 251 | |
| 252 /** | |
| 253 * Deserializes an int at the given offset. | |
| 254 */ | |
| 255 public int readInt(int offset) { | |
| 256 validateBufferSize(offset, 4); | |
| 257 return mMessage.getData().getInt(mBaseOffset + offset); | |
| 258 } | |
| 259 | |
| 260 /** | |
| 261 * Deserializes a float at the given offset. | |
| 262 */ | |
| 263 public float readFloat(int offset) { | |
| 264 validateBufferSize(offset, 4); | |
| 265 return mMessage.getData().getFloat(mBaseOffset + offset); | |
| 266 } | |
| 267 | |
| 268 /** | |
| 269 * Deserializes a long at the given offset. | |
| 270 */ | |
| 271 public long readLong(int offset) { | |
| 272 validateBufferSize(offset, 8); | |
| 273 return mMessage.getData().getLong(mBaseOffset + offset); | |
| 274 } | |
| 275 | |
| 276 /** | |
| 277 * Deserializes a double at the given offset. | |
| 278 */ | |
| 279 public double readDouble(int offset) { | |
| 280 validateBufferSize(offset, 8); | |
| 281 return mMessage.getData().getDouble(mBaseOffset + offset); | |
| 282 } | |
| 283 | |
| 284 /** | |
| 285 * Deserializes a pointer at the given offset. Returns a Decoder suitable to
decode the content | |
| 286 * of the pointer. | |
| 287 */ | |
| 288 public Decoder readPointer(int offset, boolean nullable) { | |
| 289 int basePosition = mBaseOffset + offset; | |
| 290 long pointerOffset = readLong(offset); | |
| 291 if (pointerOffset == 0) { | |
| 292 if (!nullable) { | |
| 293 throw new DeserializationException( | |
| 294 "Trying to decode null pointer for a non-nullable type."
); | |
| 295 } | |
| 296 return null; | |
| 297 } | |
| 298 int newPosition = (int) (basePosition + pointerOffset); | |
| 299 // The method |getDecoderAtPosition| will validate that the pointer addr
ess is valid. | |
| 300 return getDecoderAtPosition(newPosition); | |
| 301 | |
| 302 } | |
| 303 | |
| 304 /** | |
| 305 * Deserializes an array of boolean at the given offset. | |
| 306 */ | |
| 307 public boolean[] readBooleans(int offset, int arrayNullability, int expected
Length) { | |
| 308 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 309 if (d == null) { | |
| 310 return null; | |
| 311 } | |
| 312 DataHeader si = d.readDataHeaderForBooleanArray(expectedLength); | |
| 313 byte[] bytes = new byte[(si.elementsOrVersion + 7) / BindingsHelper.ALIG
NMENT]; | |
| 314 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 315 d.mMessage.getData().get(bytes); | |
| 316 boolean[] result = new boolean[si.elementsOrVersion]; | |
| 317 for (int i = 0; i < bytes.length; ++i) { | |
| 318 for (int j = 0; j < BindingsHelper.ALIGNMENT; ++j) { | |
| 319 int booleanIndex = i * BindingsHelper.ALIGNMENT + j; | |
| 320 if (booleanIndex < result.length) { | |
| 321 result[booleanIndex] = (bytes[i] & (1 << j)) != 0; | |
| 322 } | |
| 323 } | |
| 324 } | |
| 325 return result; | |
| 326 } | |
| 327 | |
| 328 /** | |
| 329 * Deserializes an array of bytes at the given offset. | |
| 330 */ | |
| 331 public byte[] readBytes(int offset, int arrayNullability, int expectedLength
) { | |
| 332 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 333 if (d == null) { | |
| 334 return null; | |
| 335 } | |
| 336 DataHeader si = d.readDataHeaderForArray(1, expectedLength); | |
| 337 byte[] result = new byte[si.elementsOrVersion]; | |
| 338 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 339 d.mMessage.getData().get(result); | |
| 340 return result; | |
| 341 } | |
| 342 | |
| 343 /** | |
| 344 * Deserializes an array of shorts at the given offset. | |
| 345 */ | |
| 346 public short[] readShorts(int offset, int arrayNullability, int expectedLeng
th) { | |
| 347 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 348 if (d == null) { | |
| 349 return null; | |
| 350 } | |
| 351 DataHeader si = d.readDataHeaderForArray(2, expectedLength); | |
| 352 short[] result = new short[si.elementsOrVersion]; | |
| 353 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 354 d.mMessage.getData().asShortBuffer().get(result); | |
| 355 return result; | |
| 356 } | |
| 357 | |
| 358 /** | |
| 359 * Deserializes an array of ints at the given offset. | |
| 360 */ | |
| 361 public int[] readInts(int offset, int arrayNullability, int expectedLength)
{ | |
| 362 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 363 if (d == null) { | |
| 364 return null; | |
| 365 } | |
| 366 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 367 int[] result = new int[si.elementsOrVersion]; | |
| 368 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 369 d.mMessage.getData().asIntBuffer().get(result); | |
| 370 return result; | |
| 371 } | |
| 372 | |
| 373 /** | |
| 374 * Deserializes an array of floats at the given offset. | |
| 375 */ | |
| 376 public float[] readFloats(int offset, int arrayNullability, int expectedLeng
th) { | |
| 377 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 378 if (d == null) { | |
| 379 return null; | |
| 380 } | |
| 381 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 382 float[] result = new float[si.elementsOrVersion]; | |
| 383 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 384 d.mMessage.getData().asFloatBuffer().get(result); | |
| 385 return result; | |
| 386 } | |
| 387 | |
| 388 /** | |
| 389 * Deserializes an array of longs at the given offset. | |
| 390 */ | |
| 391 public long[] readLongs(int offset, int arrayNullability, int expectedLength
) { | |
| 392 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 393 if (d == null) { | |
| 394 return null; | |
| 395 } | |
| 396 DataHeader si = d.readDataHeaderForArray(8, expectedLength); | |
| 397 long[] result = new long[si.elementsOrVersion]; | |
| 398 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 399 d.mMessage.getData().asLongBuffer().get(result); | |
| 400 return result; | |
| 401 } | |
| 402 | |
| 403 /** | |
| 404 * Deserializes an array of doubles at the given offset. | |
| 405 */ | |
| 406 public double[] readDoubles(int offset, int arrayNullability, int expectedLe
ngth) { | |
| 407 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 408 if (d == null) { | |
| 409 return null; | |
| 410 } | |
| 411 DataHeader si = d.readDataHeaderForArray(8, expectedLength); | |
| 412 double[] result = new double[si.elementsOrVersion]; | |
| 413 d.mMessage.getData().position(d.mBaseOffset + DataHeader.HEADER_SIZE); | |
| 414 d.mMessage.getData().asDoubleBuffer().get(result); | |
| 415 return result; | |
| 416 } | |
| 417 | |
| 418 /** | |
| 419 * Deserializes an |Handle| at the given offset. | |
| 420 */ | |
| 421 public Handle readHandle(int offset, boolean nullable) { | |
| 422 int index = readInt(offset); | |
| 423 if (index == -1) { | |
| 424 if (!nullable) { | |
| 425 throw new DeserializationException( | |
| 426 "Trying to decode an invalid handle for a non-nullable t
ype."); | |
| 427 } | |
| 428 return InvalidHandle.INSTANCE; | |
| 429 } | |
| 430 mValidator.claimHandle(index); | |
| 431 return mMessage.getHandles().get(index); | |
| 432 } | |
| 433 | |
| 434 /** | |
| 435 * Deserializes an |UntypedHandle| at the given offset. | |
| 436 */ | |
| 437 public UntypedHandle readUntypedHandle(int offset, boolean nullable) { | |
| 438 return readHandle(offset, nullable).toUntypedHandle(); | |
| 439 } | |
| 440 | |
| 441 /** | |
| 442 * Deserializes a |ConsumerHandle| at the given offset. | |
| 443 */ | |
| 444 public DataPipe.ConsumerHandle readConsumerHandle(int offset, boolean nullab
le) { | |
| 445 return readUntypedHandle(offset, nullable).toDataPipeConsumerHandle(); | |
| 446 } | |
| 447 | |
| 448 /** | |
| 449 * Deserializes a |ProducerHandle| at the given offset. | |
| 450 */ | |
| 451 public DataPipe.ProducerHandle readProducerHandle(int offset, boolean nullab
le) { | |
| 452 return readUntypedHandle(offset, nullable).toDataPipeProducerHandle(); | |
| 453 } | |
| 454 | |
| 455 /** | |
| 456 * Deserializes a |MessagePipeHandle| at the given offset. | |
| 457 */ | |
| 458 public MessagePipeHandle readMessagePipeHandle(int offset, boolean nullable)
{ | |
| 459 return readUntypedHandle(offset, nullable).toMessagePipeHandle(); | |
| 460 } | |
| 461 | |
| 462 /** | |
| 463 * Deserializes a |SharedBufferHandle| at the given offset. | |
| 464 */ | |
| 465 public SharedBufferHandle readSharedBufferHandle(int offset, boolean nullabl
e) { | |
| 466 return readUntypedHandle(offset, nullable).toSharedBufferHandle(); | |
| 467 } | |
| 468 | |
| 469 /** | |
| 470 * Deserializes an interface at the given offset. | |
| 471 * | |
| 472 * @return a proxy to the service. | |
| 473 */ | |
| 474 public <P extends Proxy> P readServiceInterface(int offset, boolean nullable
, | |
| 475 Interface.Manager<?, P> manager) { | |
| 476 MessagePipeHandle handle = readMessagePipeHandle(offset, nullable); | |
| 477 if (!handle.isValid()) { | |
| 478 return null; | |
| 479 } | |
| 480 int version = readInt(offset + BindingsHelper.SERIALIZED_HANDLE_SIZE); | |
| 481 return manager.attachProxy(handle, version); | |
| 482 } | |
| 483 | |
| 484 /** | |
| 485 * Deserializes a |InterfaceRequest| at the given offset. | |
| 486 */ | |
| 487 public <I extends Interface> InterfaceRequest<I> readInterfaceRequest(int of
fset, | |
| 488 boolean nullable) { | |
| 489 MessagePipeHandle handle = readMessagePipeHandle(offset, nullable); | |
| 490 if (handle == null) { | |
| 491 return null; | |
| 492 } | |
| 493 return new InterfaceRequest<I>(handle); | |
| 494 } | |
| 495 | |
| 496 /** | |
| 497 * Deserializes a string at the given offset. | |
| 498 */ | |
| 499 public String readString(int offset, boolean nullable) { | |
| 500 final int arrayNullability = nullable ? BindingsHelper.ARRAY_NULLABLE :
0; | |
| 501 byte[] bytes = readBytes(offset, arrayNullability, BindingsHelper.UNSPEC
IFIED_ARRAY_LENGTH); | |
| 502 if (bytes == null) { | |
| 503 return null; | |
| 504 } | |
| 505 return new String(bytes, Charset.forName("utf8")); | |
| 506 } | |
| 507 | |
| 508 /** | |
| 509 * Deserializes an array of |Handle| at the given offset. | |
| 510 */ | |
| 511 public Handle[] readHandles(int offset, int arrayNullability, int expectedLe
ngth) { | |
| 512 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 513 if (d == null) { | |
| 514 return null; | |
| 515 } | |
| 516 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 517 Handle[] result = new Handle[si.elementsOrVersion]; | |
| 518 for (int i = 0; i < result.length; ++i) { | |
| 519 result[i] = d.readHandle( | |
| 520 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 521 BindingsHelper.isElementNullable(arrayNullability)); | |
| 522 } | |
| 523 return result; | |
| 524 } | |
| 525 | |
| 526 /** | |
| 527 * Deserializes an array of |UntypedHandle| at the given offset. | |
| 528 */ | |
| 529 public UntypedHandle[] readUntypedHandles( | |
| 530 int offset, int arrayNullability, int expectedLength) { | |
| 531 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 532 if (d == null) { | |
| 533 return null; | |
| 534 } | |
| 535 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 536 UntypedHandle[] result = new UntypedHandle[si.elementsOrVersion]; | |
| 537 for (int i = 0; i < result.length; ++i) { | |
| 538 result[i] = d.readUntypedHandle( | |
| 539 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 540 BindingsHelper.isElementNullable(arrayNullability)); | |
| 541 } | |
| 542 return result; | |
| 543 } | |
| 544 | |
| 545 /** | |
| 546 * Deserializes an array of |ConsumerHandle| at the given offset. | |
| 547 */ | |
| 548 public DataPipe.ConsumerHandle[] readConsumerHandles( | |
| 549 int offset, int arrayNullability, int expectedLength) { | |
| 550 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 551 if (d == null) { | |
| 552 return null; | |
| 553 } | |
| 554 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 555 DataPipe.ConsumerHandle[] result = new DataPipe.ConsumerHandle[si.elemen
tsOrVersion]; | |
| 556 for (int i = 0; i < result.length; ++i) { | |
| 557 result[i] = d.readConsumerHandle( | |
| 558 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 559 BindingsHelper.isElementNullable(arrayNullability)); | |
| 560 } | |
| 561 return result; | |
| 562 } | |
| 563 | |
| 564 /** | |
| 565 * Deserializes an array of |ProducerHandle| at the given offset. | |
| 566 */ | |
| 567 public DataPipe.ProducerHandle[] readProducerHandles( | |
| 568 int offset, int arrayNullability, int expectedLength) { | |
| 569 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 570 if (d == null) { | |
| 571 return null; | |
| 572 } | |
| 573 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 574 DataPipe.ProducerHandle[] result = new DataPipe.ProducerHandle[si.elemen
tsOrVersion]; | |
| 575 for (int i = 0; i < result.length; ++i) { | |
| 576 result[i] = d.readProducerHandle( | |
| 577 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 578 BindingsHelper.isElementNullable(arrayNullability)); | |
| 579 } | |
| 580 return result; | |
| 581 | |
| 582 } | |
| 583 | |
| 584 /** | |
| 585 * Deserializes an array of |MessagePipeHandle| at the given offset. | |
| 586 */ | |
| 587 public MessagePipeHandle[] readMessagePipeHandles( | |
| 588 int offset, int arrayNullability, int expectedLength) { | |
| 589 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 590 if (d == null) { | |
| 591 return null; | |
| 592 } | |
| 593 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 594 MessagePipeHandle[] result = new MessagePipeHandle[si.elementsOrVersion]
; | |
| 595 for (int i = 0; i < result.length; ++i) { | |
| 596 result[i] = d.readMessagePipeHandle( | |
| 597 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 598 BindingsHelper.isElementNullable(arrayNullability)); | |
| 599 } | |
| 600 return result; | |
| 601 | |
| 602 } | |
| 603 | |
| 604 /** | |
| 605 * Deserializes an array of |SharedBufferHandle| at the given offset. | |
| 606 */ | |
| 607 public SharedBufferHandle[] readSharedBufferHandles( | |
| 608 int offset, int arrayNullability, int expectedLength) { | |
| 609 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 610 if (d == null) { | |
| 611 return null; | |
| 612 } | |
| 613 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 614 SharedBufferHandle[] result = new SharedBufferHandle[si.elementsOrVersio
n]; | |
| 615 for (int i = 0; i < result.length; ++i) { | |
| 616 result[i] = d.readSharedBufferHandle( | |
| 617 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 618 BindingsHelper.isElementNullable(arrayNullability)); | |
| 619 } | |
| 620 return result; | |
| 621 | |
| 622 } | |
| 623 | |
| 624 /** | |
| 625 * Deserializes an array of |ServiceHandle| at the given offset. | |
| 626 */ | |
| 627 public <S extends Interface, P extends Proxy> S[] readServiceInterfaces( | |
| 628 int offset, int arrayNullability, int expectedLength, Interface.Mana
ger<S, P> manager) { | |
| 629 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 630 if (d == null) { | |
| 631 return null; | |
| 632 } | |
| 633 DataHeader si = | |
| 634 d.readDataHeaderForArray(BindingsHelper.SERIALIZED_INTERFACE_SIZ
E, expectedLength); | |
| 635 S[] result = manager.buildArray(si.elementsOrVersion); | |
| 636 for (int i = 0; i < result.length; ++i) { | |
| 637 // This cast is necessary because java 6 doesn't handle wildcard cor
rectly when using | |
| 638 // Manager<S, ? extends S> | |
| 639 @SuppressWarnings("unchecked") | |
| 640 S value = (S) d.readServiceInterface( | |
| 641 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_INTERFACE
_SIZE * i, | |
| 642 BindingsHelper.isElementNullable(arrayNullability), manager)
; | |
| 643 result[i] = value; | |
| 644 } | |
| 645 return result; | |
| 646 } | |
| 647 | |
| 648 /** | |
| 649 * Deserializes an array of |InterfaceRequest| at the given offset. | |
| 650 */ | |
| 651 public <I extends Interface> InterfaceRequest<I>[] readInterfaceRequests( | |
| 652 int offset, int arrayNullability, int expectedLength) { | |
| 653 Decoder d = readPointer(offset, BindingsHelper.isArrayNullable(arrayNull
ability)); | |
| 654 if (d == null) { | |
| 655 return null; | |
| 656 } | |
| 657 DataHeader si = d.readDataHeaderForArray(4, expectedLength); | |
| 658 @SuppressWarnings("unchecked") | |
| 659 InterfaceRequest<I>[] result = new InterfaceRequest[si.elementsOrVersion
]; | |
| 660 for (int i = 0; i < result.length; ++i) { | |
| 661 result[i] = d.readInterfaceRequest( | |
| 662 DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SI
ZE * i, | |
| 663 BindingsHelper.isElementNullable(arrayNullability)); | |
| 664 } | |
| 665 return result; | |
| 666 } | |
| 667 | |
| 668 /** | |
| 669 * Returns a view of this decoder at the offset |offset|. | |
| 670 */ | |
| 671 private Decoder getDecoderAtPosition(int offset) { | |
| 672 return new Decoder(mMessage, mValidator, offset); | |
| 673 } | |
| 674 | |
| 675 /** | |
| 676 * Deserializes a {@link DataHeader} at the given offset and checks if it is
correct for an | |
| 677 * array of booleans. | |
| 678 */ | |
| 679 private DataHeader readDataHeaderForBooleanArray(int expectedLength) { | |
| 680 DataHeader dataHeader = readDataHeader(); | |
| 681 if (dataHeader.size < DataHeader.HEADER_SIZE + (dataHeader.elementsOrVer
sion + 7) / 8) { | |
| 682 throw new DeserializationException("Array header is incorrect."); | |
| 683 } | |
| 684 if (expectedLength != BindingsHelper.UNSPECIFIED_ARRAY_LENGTH | |
| 685 && dataHeader.elementsOrVersion != expectedLength) { | |
| 686 throw new DeserializationException("Incorrect array length. Expected
: " + expectedLength | |
| 687 + ", but got: " + dataHeader.elementsOrVersion + "."); | |
| 688 } | |
| 689 return dataHeader; | |
| 690 } | |
| 691 | |
| 692 /** | |
| 693 * Deserializes a {@link DataHeader} of an array at the given offset. | |
| 694 */ | |
| 695 private DataHeader readDataHeaderForArray(long elementSize, int expectedLeng
th) { | |
| 696 DataHeader dataHeader = readDataHeader(); | |
| 697 if (dataHeader.size | |
| 698 < (DataHeader.HEADER_SIZE + elementSize * dataHeader.elementsOrV
ersion)) { | |
| 699 throw new DeserializationException("Array header is incorrect."); | |
| 700 } | |
| 701 if (expectedLength != BindingsHelper.UNSPECIFIED_ARRAY_LENGTH | |
| 702 && dataHeader.elementsOrVersion != expectedLength) { | |
| 703 throw new DeserializationException("Incorrect array length. Expected
: " + expectedLength | |
| 704 + ", but got: " + dataHeader.elementsOrVersion + "."); | |
| 705 } | |
| 706 return dataHeader; | |
| 707 } | |
| 708 | |
| 709 private void validateBufferSize(int offset, int size) { | |
| 710 if (mMessage.getData().limit() < offset + size) { | |
| 711 throw new DeserializationException("Buffer is smaller than expected.
"); | |
| 712 } | |
| 713 } | |
| 714 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2250183003:
Make the fuchsia mojo/public repo the source of truth. (Closed)
Base URL: https://github.com/domokit/mojo.git@master