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| 1 // Copyright 2016 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.base; |
| 6 |
| 7 import android.os.Parcel; |
| 8 import android.os.Parcelable; |
| 9 |
| 10 import org.chromium.base.annotations.CalledByNative; |
| 11 |
| 12 /** |
| 13 * This class mirrors unguessable_token.h . Since tokens are passed by value, |
| 14 * we don't bother to maintain a native token. This implements Parcelable so |
| 15 * that it may be sent via binder. |
| 16 * |
| 17 * To get one of these from native, one must start with a |
| 18 * base::UnguessableToken, then create a Java object from it. See |
| 19 * jni_unguessable_token.h for information. |
| 20 */ |
| 21 public class UnguessableToken implements Parcelable { |
| 22 private final long mHigh; |
| 23 private final long mLow; |
| 24 |
| 25 private UnguessableToken(long high, long low) { |
| 26 mHigh = high; |
| 27 mLow = low; |
| 28 } |
| 29 |
| 30 @CalledByNative |
| 31 private static UnguessableToken create(long high, long low) { |
| 32 return new UnguessableToken(high, low); |
| 33 } |
| 34 |
| 35 @CalledByNative |
| 36 private long getHighForSerialization() { |
| 37 return mHigh; |
| 38 } |
| 39 |
| 40 @CalledByNative |
| 41 private long getLowForSerialization() { |
| 42 return mLow; |
| 43 } |
| 44 |
| 45 @Override |
| 46 public int describeContents() { |
| 47 return 0; |
| 48 } |
| 49 |
| 50 @Override |
| 51 public void writeToParcel(Parcel dest, int flags) { |
| 52 dest.writeLong(mHigh); |
| 53 dest.writeLong(mLow); |
| 54 } |
| 55 |
| 56 public static final Parcelable.Creator<UnguessableToken> CREATOR = |
| 57 new Parcelable.Creator<UnguessableToken>() { |
| 58 @Override |
| 59 public UnguessableToken createFromParcel(Parcel source) { |
| 60 long high = source.readLong(); |
| 61 long low = source.readLong(); |
| 62 if (high == 0 || low == 0) { |
| 63 // Refuse to create an empty UnguessableToken. |
| 64 return null; |
| 65 } |
| 66 return new UnguessableToken(high, low); |
| 67 } |
| 68 |
| 69 @Override |
| 70 public UnguessableToken[] newArray(int size) { |
| 71 return new UnguessableToken[size]; |
| 72 } |
| 73 }; |
| 74 |
| 75 // To avoid unwieldy calls in JNI for tests, parcel and unparcel. |
| 76 // TODO(liberato): It would be nice if we could include this only with a |
| 77 // java driver that's linked only with unit tests, but i don't see a way |
| 78 // to do that. |
| 79 @CalledByNative |
| 80 private UnguessableToken parcelAndUnparcelForTesting() { |
| 81 Parcel parcel = Parcel.obtain(); |
| 82 writeToParcel(parcel, 0); |
| 83 |
| 84 // Rewind the parcel and un-parcel. |
| 85 parcel.setDataPosition(0); |
| 86 UnguessableToken token = CREATOR.createFromParcel(parcel); |
| 87 parcel.recycle(); |
| 88 |
| 89 return token; |
| 90 } |
| 91 }; |
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