Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 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 | package android.hardware.location; |
| 17 | |
Arthur Ishiguro | f2b6f01 | 2017-11-28 15:21:38 -0800 | [diff] [blame] | 18 | import android.annotation.SystemApi; |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 19 | import android.os.Parcel; |
| 20 | import android.os.Parcelable; |
| 21 | import android.util.Log; |
| 22 | |
| 23 | import java.nio.BufferUnderflowException; |
| 24 | import java.nio.ByteBuffer; |
| 25 | import java.nio.ByteOrder; |
Arthur Ishiguro | 0d719c2 | 2017-10-30 16:41:40 -0700 | [diff] [blame] | 26 | import java.util.Arrays; |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 27 | |
| 28 | /** |
| 29 | * @hide |
| 30 | */ |
Arthur Ishiguro | f2b6f01 | 2017-11-28 15:21:38 -0800 | [diff] [blame] | 31 | @SystemApi |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 32 | public final class NanoAppBinary implements Parcelable { |
| 33 | private static final String TAG = "NanoAppBinary"; |
| 34 | |
| 35 | /* |
| 36 | * The contents of the app binary. |
| 37 | */ |
| 38 | private byte[] mNanoAppBinary; |
| 39 | |
| 40 | /* |
| 41 | * Contents of the nanoapp binary header. |
| 42 | * |
| 43 | * Only valid if mHasValidHeader is true. |
| 44 | * See nano_app_binary_t in context_hub.h for details. |
| 45 | */ |
| 46 | private int mHeaderVersion; |
| 47 | private int mMagic; |
| 48 | private long mNanoAppId; |
| 49 | private int mNanoAppVersion; |
| 50 | private int mFlags; |
| 51 | private long mHwHubType; |
| 52 | private byte mTargetChreApiMajorVersion; |
| 53 | private byte mTargetChreApiMinorVersion; |
| 54 | |
| 55 | private boolean mHasValidHeader = false; |
| 56 | |
| 57 | /* |
| 58 | * The header version used to parse the binary in parseBinaryHeader(). |
| 59 | */ |
| 60 | private static final int EXPECTED_HEADER_VERSION = 1; |
| 61 | |
| 62 | /* |
Arthur Ishiguro | 0d719c2 | 2017-10-30 16:41:40 -0700 | [diff] [blame] | 63 | * The magic value expected in the header as defined in context_hub.h. |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 64 | */ |
| 65 | private static final int EXPECTED_MAGIC_VALUE = |
| 66 | (((int) 'N' << 0) | ((int) 'A' << 8) | ((int) 'N' << 16) | ((int) 'O' << 24)); |
| 67 | |
| 68 | /* |
| 69 | * Byte order established in context_hub.h |
| 70 | */ |
| 71 | private static final ByteOrder HEADER_ORDER = ByteOrder.LITTLE_ENDIAN; |
| 72 | |
Arthur Ishiguro | 0d719c2 | 2017-10-30 16:41:40 -0700 | [diff] [blame] | 73 | /* |
| 74 | * The size of the header in bytes as defined in context_hub.h. |
| 75 | */ |
| 76 | private static final int HEADER_SIZE_BYTES = 40; |
| 77 | |
| 78 | /* |
| 79 | * The bit fields for mFlags as defined in context_hub.h. |
| 80 | */ |
| 81 | private static final int NANOAPP_SIGNED_FLAG_BIT = 0x1; |
| 82 | private static final int NANOAPP_ENCRYPTED_FLAG_BIT = 0x2; |
| 83 | |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 84 | public NanoAppBinary(byte[] appBinary) { |
| 85 | mNanoAppBinary = appBinary; |
| 86 | parseBinaryHeader(); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Parses the binary header and populates its field using mNanoAppBinary. |
| 91 | */ |
| 92 | private void parseBinaryHeader() { |
| 93 | ByteBuffer buf = ByteBuffer.wrap(mNanoAppBinary).order(HEADER_ORDER); |
| 94 | |
| 95 | mHasValidHeader = false; |
| 96 | try { |
| 97 | mHeaderVersion = buf.getInt(); |
| 98 | if (mHeaderVersion != EXPECTED_HEADER_VERSION) { |
| 99 | Log.e(TAG, "Unexpected header version " + mHeaderVersion + " while parsing header" |
| 100 | + " (expected " + EXPECTED_HEADER_VERSION + ")"); |
| 101 | return; |
| 102 | } |
| 103 | |
| 104 | mMagic = buf.getInt(); |
| 105 | mNanoAppId = buf.getLong(); |
| 106 | mNanoAppVersion = buf.getInt(); |
| 107 | mFlags = buf.getInt(); |
| 108 | mHwHubType = buf.getLong(); |
| 109 | mTargetChreApiMajorVersion = buf.get(); |
| 110 | mTargetChreApiMinorVersion = buf.get(); |
| 111 | } catch (BufferUnderflowException e) { |
| 112 | Log.e(TAG, "Not enough contents in nanoapp header"); |
| 113 | return; |
| 114 | } |
| 115 | |
| 116 | if (mMagic != EXPECTED_MAGIC_VALUE) { |
| 117 | Log.e(TAG, "Unexpected magic value " + String.format("0x%08X", mMagic) |
| 118 | + "while parsing header (expected " |
| 119 | + String.format("0x%08X", EXPECTED_MAGIC_VALUE) + ")"); |
| 120 | } else { |
| 121 | mHasValidHeader = true; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * @return the app binary byte array |
| 127 | */ |
Arthur Ishiguro | 0d719c2 | 2017-10-30 16:41:40 -0700 | [diff] [blame] | 128 | public byte[] getBinary() { |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 129 | return mNanoAppBinary; |
| 130 | } |
| 131 | |
| 132 | /** |
Arthur Ishiguro | 0d719c2 | 2017-10-30 16:41:40 -0700 | [diff] [blame] | 133 | * @return the app binary byte array without the leading header |
| 134 | * |
| 135 | * @throws IndexOutOfBoundsException if the nanoapp binary size is smaller than the header size |
| 136 | * @throws NullPointerException if the nanoapp binary is null |
| 137 | */ |
| 138 | public byte[] getBinaryNoHeader() { |
| 139 | if (mNanoAppBinary.length < HEADER_SIZE_BYTES) { |
| 140 | throw new IndexOutOfBoundsException("NanoAppBinary binary byte size (" |
| 141 | + mNanoAppBinary.length + ") is less than header size (" + HEADER_SIZE_BYTES + ")"); |
| 142 | } |
| 143 | |
| 144 | return Arrays.copyOfRange(mNanoAppBinary, HEADER_SIZE_BYTES, mNanoAppBinary.length); |
| 145 | } |
| 146 | |
| 147 | /** |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 148 | * @return {@code true} if the header is valid, {@code false} otherwise |
| 149 | */ |
| 150 | public boolean hasValidHeader() { |
| 151 | return mHasValidHeader; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * @return the header version |
| 156 | */ |
| 157 | public int getHeaderVersion() { |
| 158 | return mHeaderVersion; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * @return the app ID parsed from the nanoapp header |
| 163 | */ |
| 164 | public long getNanoAppId() { |
| 165 | return mNanoAppId; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * @return the app version parsed from the nanoapp header |
| 170 | */ |
| 171 | public int getNanoAppVersion() { |
| 172 | return mNanoAppVersion; |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * @return the compile target hub type parsed from the nanoapp header |
| 177 | */ |
| 178 | public long getHwHubType() { |
| 179 | return mHwHubType; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * @return the target CHRE API major version parsed from the nanoapp header |
| 184 | */ |
| 185 | public byte getTargetChreApiMajorVersion() { |
| 186 | return mTargetChreApiMajorVersion; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * @return the target CHRE API minor version parsed from the nanoapp header |
| 191 | */ |
| 192 | public byte getTargetChreApiMinorVersion() { |
| 193 | return mTargetChreApiMinorVersion; |
| 194 | } |
| 195 | |
Arthur Ishiguro | 0d719c2 | 2017-10-30 16:41:40 -0700 | [diff] [blame] | 196 | /** |
| 197 | * Returns the flags for the nanoapp as defined in context_hub.h. |
| 198 | * |
| 199 | * This method is meant to be used by the Context Hub Service. |
| 200 | * |
| 201 | * @return the flags for the nanoapp |
| 202 | */ |
| 203 | public int getFlags() { |
| 204 | return mFlags; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * @return {@code true} if the nanoapp binary is signed, {@code false} otherwise |
| 209 | */ |
| 210 | public boolean isSigned() { |
| 211 | return (mFlags & NANOAPP_SIGNED_FLAG_BIT) != 0; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * @return {@code true} if the nanoapp binary is encrypted, {@code false} otherwise |
| 216 | */ |
| 217 | public boolean isEncrypted() { |
| 218 | return (mFlags & NANOAPP_ENCRYPTED_FLAG_BIT) != 0; |
| 219 | } |
| 220 | |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 221 | private NanoAppBinary(Parcel in) { |
| 222 | int binaryLength = in.readInt(); |
| 223 | mNanoAppBinary = new byte[binaryLength]; |
| 224 | in.readByteArray(mNanoAppBinary); |
| 225 | |
| 226 | parseBinaryHeader(); |
| 227 | } |
| 228 | |
| 229 | @Override |
| 230 | public int describeContents() { |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | @Override |
| 235 | public void writeToParcel(Parcel out, int flags) { |
| 236 | out.writeInt(mNanoAppBinary.length); |
| 237 | out.writeByteArray(mNanoAppBinary); |
| 238 | } |
| 239 | |
Jeff Sharkey | 9e8f83d | 2019-02-28 12:06:45 -0700 | [diff] [blame] | 240 | public static final @android.annotation.NonNull Creator<NanoAppBinary> CREATOR = |
Arthur Ishiguro | b9ae7bd | 2017-10-09 12:47:52 -0700 | [diff] [blame] | 241 | new Creator<NanoAppBinary>() { |
| 242 | @Override |
| 243 | public NanoAppBinary createFromParcel(Parcel in) { |
| 244 | return new NanoAppBinary(in); |
| 245 | } |
| 246 | |
| 247 | @Override |
| 248 | public NanoAppBinary[] newArray(int size) { |
| 249 | return new NanoAppBinary[size]; |
| 250 | } |
| 251 | }; |
| 252 | } |