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#include <sensor/Sensor.h>
18
19#include <inttypes.h>
20
21#include <binder/AppOpsManager.h>
22#include <binder/IPermissionController.h>
23#include <binder/IServiceManager.h>
24
25// ----------------------------------------------------------------------------
26namespace android {
27// ----------------------------------------------------------------------------
28
29Sensor::Sensor(const char * name) :
30        mName(name), mHandle(0), mType(0),
31        mMinValue(0), mMaxValue(0), mResolution(0),
32        mPower(0), mMinDelay(0), mVersion(0), mFifoReservedEventCount(0),
33        mFifoMaxEventCount(0), mRequiredAppOp(-1),
34        mMaxDelay(0), mFlags(0) {
35}
36
37Sensor::Sensor(struct sensor_t const* hwSensor, int halVersion) :
38        Sensor(*hwSensor, uuid_t(), halVersion) {
39}
40
41Sensor::Sensor(struct sensor_t const& hwSensor, const uuid_t& uuid, int halVersion) :
42        Sensor("") {
43    mName = hwSensor.name;
44    mVendor = hwSensor.vendor;
45    mVersion = hwSensor.version;
46    mHandle = hwSensor.handle;
47    mType = hwSensor.type;
48    mMinValue = 0;                      // FIXME: minValue
49    mMaxValue = hwSensor.maxRange;      // FIXME: maxValue
50    mResolution = hwSensor.resolution;
51    mPower = hwSensor.power;
52    mMinDelay = hwSensor.minDelay;
53    mFlags = 0;
54    mUuid = uuid;
55
56    // Set fifo event count zero for older devices which do not support batching. Fused
57    // sensors also have their fifo counts set to zero.
58    if (halVersion > SENSORS_DEVICE_API_VERSION_1_0) {
59        mFifoReservedEventCount = hwSensor.fifoReservedEventCount;
60        mFifoMaxEventCount = hwSensor.fifoMaxEventCount;
61    } else {
62        mFifoReservedEventCount = 0;
63        mFifoMaxEventCount = 0;
64    }
65
66    if (halVersion >= SENSORS_DEVICE_API_VERSION_1_3) {
67        if (hwSensor.maxDelay > INT_MAX) {
68            // Max delay is declared as a 64 bit integer for 64 bit architectures. But it should
69            // always fit in a 32 bit integer, log error and cap it to INT_MAX.
70            ALOGE("Sensor maxDelay overflow error %s %" PRId64, mName.string(),
71                  static_cast<int64_t>(hwSensor.maxDelay));
72            mMaxDelay = INT_MAX;
73        } else {
74            mMaxDelay = static_cast<int32_t>(hwSensor.maxDelay);
75        }
76    } else {
77        // For older hals set maxDelay to 0.
78        mMaxDelay = 0;
79    }
80
81    // Ensure existing sensors have correct string type, required permissions and reporting mode.
82    // Set reportingMode for all android defined sensor types, set wake-up flag only for proximity
83    // sensor, significant motion, tilt, pick_up gesture, wake gesture and glance gesture on older
84    // HALs. Newer HALs can define both wake-up and non wake-up proximity sensors.
85    // All the OEM defined defined sensors have flags set to whatever is provided by the HAL.
86    switch (mType) {
87    case SENSOR_TYPE_ACCELEROMETER:
88        mStringType = SENSOR_STRING_TYPE_ACCELEROMETER;
89        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
90        break;
91    case SENSOR_TYPE_AMBIENT_TEMPERATURE:
92        mStringType = SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE;
93        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
94        break;
95    case SENSOR_TYPE_GAME_ROTATION_VECTOR:
96        mStringType = SENSOR_STRING_TYPE_GAME_ROTATION_VECTOR;
97        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
98        break;
99    case SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR:
100        mStringType = SENSOR_STRING_TYPE_GEOMAGNETIC_ROTATION_VECTOR;
101        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
102        break;
103    case SENSOR_TYPE_GRAVITY:
104        mStringType = SENSOR_STRING_TYPE_GRAVITY;
105        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
106        break;
107    case SENSOR_TYPE_GYROSCOPE:
108        mStringType = SENSOR_STRING_TYPE_GYROSCOPE;
109        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
110        break;
111    case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
112        mStringType = SENSOR_STRING_TYPE_GYROSCOPE_UNCALIBRATED;
113        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
114        break;
115    case SENSOR_TYPE_HEART_RATE: {
116        mStringType = SENSOR_STRING_TYPE_HEART_RATE;
117        mRequiredPermission = SENSOR_PERMISSION_BODY_SENSORS;
118        AppOpsManager appOps;
119        mRequiredAppOp = appOps.permissionToOpCode(String16(SENSOR_PERMISSION_BODY_SENSORS));
120        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
121        } break;
122    case SENSOR_TYPE_LIGHT:
123        mStringType = SENSOR_STRING_TYPE_LIGHT;
124        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
125        break;
126    case SENSOR_TYPE_LINEAR_ACCELERATION:
127        mStringType = SENSOR_STRING_TYPE_LINEAR_ACCELERATION;
128        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
129        break;
130    case SENSOR_TYPE_MAGNETIC_FIELD:
131        mStringType = SENSOR_STRING_TYPE_MAGNETIC_FIELD;
132        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
133        break;
134    case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
135        mStringType = SENSOR_STRING_TYPE_MAGNETIC_FIELD_UNCALIBRATED;
136        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
137        break;
138    case SENSOR_TYPE_ORIENTATION:
139        mStringType = SENSOR_STRING_TYPE_ORIENTATION;
140        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
141        break;
142    case SENSOR_TYPE_PRESSURE:
143        mStringType = SENSOR_STRING_TYPE_PRESSURE;
144        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
145        break;
146    case SENSOR_TYPE_PROXIMITY:
147        mStringType = SENSOR_STRING_TYPE_PROXIMITY;
148        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
149        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
150            mFlags |= SENSOR_FLAG_WAKE_UP;
151        }
152        break;
153    case SENSOR_TYPE_RELATIVE_HUMIDITY:
154        mStringType = SENSOR_STRING_TYPE_RELATIVE_HUMIDITY;
155        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
156        break;
157    case SENSOR_TYPE_ROTATION_VECTOR:
158        mStringType = SENSOR_STRING_TYPE_ROTATION_VECTOR;
159        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
160        break;
161    case SENSOR_TYPE_SIGNIFICANT_MOTION:
162        mStringType = SENSOR_STRING_TYPE_SIGNIFICANT_MOTION;
163        mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
164        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
165            mFlags |= SENSOR_FLAG_WAKE_UP;
166        }
167        break;
168    case SENSOR_TYPE_STEP_COUNTER:
169        mStringType = SENSOR_STRING_TYPE_STEP_COUNTER;
170        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
171        break;
172    case SENSOR_TYPE_STEP_DETECTOR:
173        mStringType = SENSOR_STRING_TYPE_STEP_DETECTOR;
174        mFlags |= SENSOR_FLAG_SPECIAL_REPORTING_MODE;
175        break;
176    case SENSOR_TYPE_TEMPERATURE:
177        mStringType = SENSOR_STRING_TYPE_TEMPERATURE;
178        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
179        break;
180    case SENSOR_TYPE_TILT_DETECTOR:
181        mStringType = SENSOR_STRING_TYPE_TILT_DETECTOR;
182        mFlags |= SENSOR_FLAG_SPECIAL_REPORTING_MODE;
183        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
184            mFlags |= SENSOR_FLAG_WAKE_UP;
185        }
186        break;
187    case SENSOR_TYPE_WAKE_GESTURE:
188        mStringType = SENSOR_STRING_TYPE_WAKE_GESTURE;
189        mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
190        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
191            mFlags |= SENSOR_FLAG_WAKE_UP;
192        }
193        break;
194    case SENSOR_TYPE_GLANCE_GESTURE:
195        mStringType = SENSOR_STRING_TYPE_GLANCE_GESTURE;
196        mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
197        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
198            mFlags |= SENSOR_FLAG_WAKE_UP;
199        }
200        break;
201    case SENSOR_TYPE_PICK_UP_GESTURE:
202        mStringType = SENSOR_STRING_TYPE_PICK_UP_GESTURE;
203        mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
204        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
205            mFlags |= SENSOR_FLAG_WAKE_UP;
206        }
207        break;
208    case SENSOR_TYPE_LOW_LATENCY_OFFBODY_DETECT:
209        mStringType = SENSOR_STRING_TYPE_LOW_LATENCY_OFFBODY_DETECT;
210        mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
211        break;
212    case SENSOR_TYPE_WRIST_TILT_GESTURE:
213        mStringType = SENSOR_STRING_TYPE_WRIST_TILT_GESTURE;
214        mFlags |= SENSOR_FLAG_SPECIAL_REPORTING_MODE;
215        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
216            mFlags |= SENSOR_FLAG_WAKE_UP;
217        }
218        break;
219    case SENSOR_TYPE_DYNAMIC_SENSOR_META:
220        mStringType = SENSOR_STRING_TYPE_DYNAMIC_SENSOR_META;
221        mFlags |= SENSOR_FLAG_SPECIAL_REPORTING_MODE; // special trigger
222        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
223            mFlags |= SENSOR_FLAG_WAKE_UP;
224        }
225        break;
226    case SENSOR_TYPE_POSE_6DOF:
227        mStringType = SENSOR_STRING_TYPE_POSE_6DOF;
228        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
229        break;
230    case SENSOR_TYPE_STATIONARY_DETECT:
231        mStringType = SENSOR_STRING_TYPE_STATIONARY_DETECT;
232        mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
233        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
234            mFlags |= SENSOR_FLAG_WAKE_UP;
235        }
236        break;
237    case SENSOR_TYPE_MOTION_DETECT:
238        mStringType = SENSOR_STRING_TYPE_MOTION_DETECT;
239        mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
240        if (halVersion < SENSORS_DEVICE_API_VERSION_1_3) {
241            mFlags |= SENSOR_FLAG_WAKE_UP;
242        }
243        break;
244    case SENSOR_TYPE_HEART_BEAT:
245        mStringType = SENSOR_STRING_TYPE_HEART_BEAT;
246        mFlags |= SENSOR_FLAG_SPECIAL_REPORTING_MODE;
247        break;
248
249    // TODO:  Placeholder for LLOB sensor type
250
251
252    case SENSOR_TYPE_ACCELEROMETER_UNCALIBRATED:
253        mStringType = SENSOR_STRING_TYPE_ACCELEROMETER_UNCALIBRATED;
254        mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
255        break;
256    default:
257        // Only pipe the stringType, requiredPermission and flags for custom sensors.
258        if (halVersion > SENSORS_DEVICE_API_VERSION_1_0 && hwSensor.stringType) {
259            mStringType = hwSensor.stringType;
260        }
261        if (halVersion > SENSORS_DEVICE_API_VERSION_1_0 && hwSensor.requiredPermission) {
262            mRequiredPermission = hwSensor.requiredPermission;
263            if (!strcmp(mRequiredPermission, SENSOR_PERMISSION_BODY_SENSORS)) {
264                AppOpsManager appOps;
265                mRequiredAppOp = appOps.permissionToOpCode(String16(SENSOR_PERMISSION_BODY_SENSORS));
266            }
267        }
268
269        if (halVersion >= SENSORS_DEVICE_API_VERSION_1_3) {
270            mFlags = static_cast<uint32_t>(hwSensor.flags);
271        } else {
272            // This is an OEM defined sensor on an older HAL. Use minDelay to determine the
273            // reporting mode of the sensor.
274            if (mMinDelay > 0) {
275                mFlags |= SENSOR_FLAG_CONTINUOUS_MODE;
276            } else if (mMinDelay == 0) {
277                mFlags |= SENSOR_FLAG_ON_CHANGE_MODE;
278            } else if (mMinDelay < 0) {
279                mFlags |= SENSOR_FLAG_ONE_SHOT_MODE;
280            }
281        }
282        break;
283    }
284
285    if (halVersion >= SENSORS_DEVICE_API_VERSION_1_3) {
286        // Wake-up flag of HAL 1.3 and above is set here
287        mFlags |= (hwSensor.flags & SENSOR_FLAG_WAKE_UP);
288
289        // Log error if the reporting mode is not as expected, but respect HAL setting.
290        int actualReportingMode = (hwSensor.flags & REPORTING_MODE_MASK) >> REPORTING_MODE_SHIFT;
291        int expectedReportingMode = (mFlags & REPORTING_MODE_MASK) >> REPORTING_MODE_SHIFT;
292        if (actualReportingMode != expectedReportingMode) {
293            ALOGE("Reporting Mode incorrect: sensor %s handle=%#010" PRIx32 " type=%" PRId32 " "
294                   "actual=%d expected=%d",
295                   mName.string(), mHandle, mType, actualReportingMode, expectedReportingMode);
296        }
297    }
298
299    // Feature flags
300    // Set DYNAMIC_SENSOR_MASK and ADDITIONAL_INFO_MASK flag here. Compatible with HAL 1_3.
301    if (halVersion >= SENSORS_DEVICE_API_VERSION_1_3) {
302        mFlags |= hwSensor.flags & (DYNAMIC_SENSOR_MASK | ADDITIONAL_INFO_MASK);
303    }
304    // Set DIRECT_REPORT_MASK and DIRECT_CHANNEL_MASK flags. Compatible with HAL 1_3.
305    if (halVersion >= SENSORS_DEVICE_API_VERSION_1_3) {
306        // only on continuous sensors direct report mode is defined
307        if ((mFlags & REPORTING_MODE_MASK) == SENSOR_FLAG_CONTINUOUS_MODE) {
308            mFlags |= hwSensor.flags
309                & (SENSOR_FLAG_MASK_DIRECT_REPORT | SENSOR_FLAG_MASK_DIRECT_CHANNEL);
310        }
311    }
312    // Set DATA_INJECTION flag here. Defined in HAL 1_4.
313    if (halVersion >= SENSORS_DEVICE_API_VERSION_1_4) {
314        mFlags |= (hwSensor.flags & DATA_INJECTION_MASK);
315    }
316
317    if (mRequiredPermission.length() > 0) {
318        // If the sensor is protected by a permission we need to know if it is
319        // a runtime one to determine whether we can use the permission cache.
320        sp<IBinder> binder = defaultServiceManager()->getService(String16("permission"));
321        if (binder != 0) {
322            sp<IPermissionController> permCtrl = interface_cast<IPermissionController>(binder);
323            mRequiredPermissionRuntime = permCtrl->isRuntimePermission(
324                    String16(mRequiredPermission));
325        }
326    }
327}
328
329Sensor::~Sensor() {
330}
331
332const String8& Sensor::getName() const {
333    return mName;
334}
335
336const String8& Sensor::getVendor() const {
337    return mVendor;
338}
339
340int32_t Sensor::getHandle() const {
341    return mHandle;
342}
343
344int32_t Sensor::getType() const {
345    return mType;
346}
347
348float Sensor::getMinValue() const {
349    return mMinValue;
350}
351
352float Sensor::getMaxValue() const {
353    return mMaxValue;
354}
355
356float Sensor::getResolution() const {
357    return mResolution;
358}
359
360float Sensor::getPowerUsage() const {
361    return mPower;
362}
363
364int32_t Sensor::getMinDelay() const {
365    return mMinDelay;
366}
367
368nsecs_t Sensor::getMinDelayNs() const {
369    return getMinDelay() * 1000;
370}
371
372int32_t Sensor::getVersion() const {
373    return mVersion;
374}
375
376uint32_t Sensor::getFifoReservedEventCount() const {
377    return mFifoReservedEventCount;
378}
379
380uint32_t Sensor::getFifoMaxEventCount() const {
381    return mFifoMaxEventCount;
382}
383
384const String8& Sensor::getStringType() const {
385    return mStringType;
386}
387
388const String8& Sensor::getRequiredPermission() const {
389    return mRequiredPermission;
390}
391
392bool Sensor::isRequiredPermissionRuntime() const {
393    return mRequiredPermissionRuntime;
394}
395
396int32_t Sensor::getRequiredAppOp() const {
397    return mRequiredAppOp;
398}
399
400int32_t Sensor::getMaxDelay() const {
401    return mMaxDelay;
402}
403
404uint32_t Sensor::getFlags() const {
405    return mFlags;
406}
407
408bool Sensor::isWakeUpSensor() const {
409    return (mFlags & SENSOR_FLAG_WAKE_UP) != 0;
410}
411
412bool Sensor::isDynamicSensor() const {
413    return (mFlags & SENSOR_FLAG_DYNAMIC_SENSOR) != 0;
414}
415
416bool Sensor::isDataInjectionSupported() const {
417    return (mFlags & SENSOR_FLAG_DATA_INJECTION) != 0;
418}
419
420bool Sensor::hasAdditionalInfo() const {
421    return (mFlags & SENSOR_FLAG_ADDITIONAL_INFO) != 0;
422}
423
424int32_t Sensor::getHighestDirectReportRateLevel() const {
425    return ((mFlags & SENSOR_FLAG_MASK_DIRECT_REPORT) >> SENSOR_FLAG_SHIFT_DIRECT_REPORT);
426}
427
428bool Sensor::isDirectChannelTypeSupported(int32_t sharedMemType) const {
429    switch (sharedMemType) {
430        case SENSOR_DIRECT_MEM_TYPE_ASHMEM:
431            return mFlags & SENSOR_FLAG_DIRECT_CHANNEL_ASHMEM;
432        case SENSOR_DIRECT_MEM_TYPE_GRALLOC:
433            return mFlags & SENSOR_FLAG_DIRECT_CHANNEL_GRALLOC;
434        default:
435            return false;
436    }
437}
438
439int32_t Sensor::getReportingMode() const {
440    return ((mFlags & REPORTING_MODE_MASK) >> REPORTING_MODE_SHIFT);
441}
442
443const Sensor::uuid_t& Sensor::getUuid() const {
444    return mUuid;
445}
446
447void Sensor::setId(int32_t id) {
448    mUuid.i64[0] = id;
449    mUuid.i64[1] = 0;
450}
451
452int32_t Sensor::getId() const {
453    return int32_t(mUuid.i64[0]);
454}
455
456size_t Sensor::getFlattenedSize() const {
457    size_t fixedSize =
458            sizeof(mVersion) + sizeof(mHandle) + sizeof(mType) +
459            sizeof(mMinValue) + sizeof(mMaxValue) + sizeof(mResolution) +
460            sizeof(mPower) + sizeof(mMinDelay) + sizeof(mFifoMaxEventCount) +
461            sizeof(mFifoMaxEventCount) + sizeof(mRequiredPermissionRuntime) +
462            sizeof(mRequiredAppOp) + sizeof(mMaxDelay) + sizeof(mFlags) + sizeof(mUuid);
463
464    size_t variableSize =
465            sizeof(uint32_t) + FlattenableUtils::align<4>(mName.length()) +
466            sizeof(uint32_t) + FlattenableUtils::align<4>(mVendor.length()) +
467            sizeof(uint32_t) + FlattenableUtils::align<4>(mStringType.length()) +
468            sizeof(uint32_t) + FlattenableUtils::align<4>(mRequiredPermission.length());
469
470    return fixedSize + variableSize;
471}
472
473status_t Sensor::flatten(void* buffer, size_t size) const {
474    if (size < getFlattenedSize()) {
475        return NO_MEMORY;
476    }
477
478    flattenString8(buffer, size, mName);
479    flattenString8(buffer, size, mVendor);
480    FlattenableUtils::write(buffer, size, mVersion);
481    FlattenableUtils::write(buffer, size, mHandle);
482    FlattenableUtils::write(buffer, size, mType);
483    FlattenableUtils::write(buffer, size, mMinValue);
484    FlattenableUtils::write(buffer, size, mMaxValue);
485    FlattenableUtils::write(buffer, size, mResolution);
486    FlattenableUtils::write(buffer, size, mPower);
487    FlattenableUtils::write(buffer, size, mMinDelay);
488    FlattenableUtils::write(buffer, size, mFifoReservedEventCount);
489    FlattenableUtils::write(buffer, size, mFifoMaxEventCount);
490    flattenString8(buffer, size, mStringType);
491    flattenString8(buffer, size, mRequiredPermission);
492    FlattenableUtils::write(buffer, size, mRequiredPermissionRuntime);
493    FlattenableUtils::write(buffer, size, mRequiredAppOp);
494    FlattenableUtils::write(buffer, size, mMaxDelay);
495    FlattenableUtils::write(buffer, size, mFlags);
496    if (mUuid.i64[1] != 0) {
497        // We should never hit this case with our current API, but we
498        // could via a careless API change.  If that happens,
499        // this code will keep us from leaking our UUID (while probably
500        // breaking dynamic sensors).  See b/29547335.
501        ALOGW("Sensor with UUID being flattened; sending 0.  Expect "
502              "bad dynamic sensor behavior");
503        uuid_t tmpUuid;  // default constructor makes this 0.
504        FlattenableUtils::write(buffer, size, tmpUuid);
505    } else {
506        FlattenableUtils::write(buffer, size, mUuid);
507    }
508    return NO_ERROR;
509}
510
511status_t Sensor::unflatten(void const* buffer, size_t size) {
512    if (!unflattenString8(buffer, size, mName)) {
513        return NO_MEMORY;
514    }
515    if (!unflattenString8(buffer, size, mVendor)) {
516        return NO_MEMORY;
517    }
518
519    size_t fixedSize1 =
520            sizeof(mVersion) + sizeof(mHandle) + sizeof(mType) + sizeof(mMinValue) +
521            sizeof(mMaxValue) + sizeof(mResolution) + sizeof(mPower) + sizeof(mMinDelay) +
522            sizeof(mFifoMaxEventCount) + sizeof(mFifoMaxEventCount);
523    if (size < fixedSize1) {
524        return NO_MEMORY;
525    }
526
527    FlattenableUtils::read(buffer, size, mVersion);
528    FlattenableUtils::read(buffer, size, mHandle);
529    FlattenableUtils::read(buffer, size, mType);
530    FlattenableUtils::read(buffer, size, mMinValue);
531    FlattenableUtils::read(buffer, size, mMaxValue);
532    FlattenableUtils::read(buffer, size, mResolution);
533    FlattenableUtils::read(buffer, size, mPower);
534    FlattenableUtils::read(buffer, size, mMinDelay);
535    FlattenableUtils::read(buffer, size, mFifoReservedEventCount);
536    FlattenableUtils::read(buffer, size, mFifoMaxEventCount);
537
538    if (!unflattenString8(buffer, size, mStringType)) {
539        return NO_MEMORY;
540    }
541    if (!unflattenString8(buffer, size, mRequiredPermission)) {
542        return NO_MEMORY;
543    }
544
545    size_t fixedSize2 =
546            sizeof(mRequiredPermissionRuntime) + sizeof(mRequiredAppOp) + sizeof(mMaxDelay) +
547            sizeof(mFlags) + sizeof(mUuid);
548    if (size < fixedSize2) {
549        return NO_MEMORY;
550    }
551
552    FlattenableUtils::read(buffer, size, mRequiredPermissionRuntime);
553    FlattenableUtils::read(buffer, size, mRequiredAppOp);
554    FlattenableUtils::read(buffer, size, mMaxDelay);
555    FlattenableUtils::read(buffer, size, mFlags);
556    FlattenableUtils::read(buffer, size, mUuid);
557    return NO_ERROR;
558}
559
560void Sensor::flattenString8(void*& buffer, size_t& size,
561        const String8& string8) {
562    uint32_t len = static_cast<uint32_t>(string8.length());
563    FlattenableUtils::write(buffer, size, len);
564    memcpy(static_cast<char*>(buffer), string8.string(), len);
565    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
566}
567
568bool Sensor::unflattenString8(void const*& buffer, size_t& size, String8& outputString8) {
569    uint32_t len;
570    if (size < sizeof(len)) {
571        return false;
572    }
573    FlattenableUtils::read(buffer, size, len);
574    if (size < len) {
575        return false;
576    }
577    outputString8.setTo(static_cast<char const*>(buffer), len);
578    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
579    return true;
580}
581
582// ----------------------------------------------------------------------------
583}; // namespace android
584