1 /*
2  * Copyright (C) 2012 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 // #define LOG_NDEBUG 0
18 
19 #define LOG_TAG "Camera2-Metadata"
20 #include <utils/Log.h>
21 #include <utils/Errors.h>
22 
23 #include <camera/CameraMetadata.h>
24 #include <binder/Parcel.h>
25 
26 namespace android {
27 
28 #define ALIGN_TO(val, alignment) \
29     (((uintptr_t)(val) + ((alignment) - 1)) & ~((alignment) - 1))
30 
31 typedef Parcel::WritableBlob WritableBlob;
32 typedef Parcel::ReadableBlob ReadableBlob;
33 
CameraMetadata()34 CameraMetadata::CameraMetadata() :
35         mBuffer(NULL), mLocked(false) {
36 }
37 
CameraMetadata(size_t entryCapacity,size_t dataCapacity)38 CameraMetadata::CameraMetadata(size_t entryCapacity, size_t dataCapacity) :
39         mLocked(false)
40 {
41     mBuffer = allocate_camera_metadata(entryCapacity, dataCapacity);
42 }
43 
CameraMetadata(const CameraMetadata & other)44 CameraMetadata::CameraMetadata(const CameraMetadata &other) :
45         mLocked(false) {
46     mBuffer = clone_camera_metadata(other.mBuffer);
47 }
48 
CameraMetadata(camera_metadata_t * buffer)49 CameraMetadata::CameraMetadata(camera_metadata_t *buffer) :
50         mBuffer(NULL), mLocked(false) {
51     acquire(buffer);
52 }
53 
operator =(const CameraMetadata & other)54 CameraMetadata &CameraMetadata::operator=(const CameraMetadata &other) {
55     return operator=(other.mBuffer);
56 }
57 
operator =(const camera_metadata_t * buffer)58 CameraMetadata &CameraMetadata::operator=(const camera_metadata_t *buffer) {
59     if (mLocked) {
60         ALOGE("%s: Assignment to a locked CameraMetadata!", __FUNCTION__);
61         return *this;
62     }
63 
64     if (CC_LIKELY(buffer != mBuffer)) {
65         camera_metadata_t *newBuffer = clone_camera_metadata(buffer);
66         clear();
67         mBuffer = newBuffer;
68     }
69     return *this;
70 }
71 
~CameraMetadata()72 CameraMetadata::~CameraMetadata() {
73     mLocked = false;
74     clear();
75 }
76 
getAndLock()77 const camera_metadata_t* CameraMetadata::getAndLock() {
78     mLocked = true;
79     return mBuffer;
80 }
81 
unlock(const camera_metadata_t * buffer)82 status_t CameraMetadata::unlock(const camera_metadata_t *buffer) {
83     if (!mLocked) {
84         ALOGE("%s: Can't unlock a non-locked CameraMetadata!", __FUNCTION__);
85         return INVALID_OPERATION;
86     }
87     if (buffer != mBuffer) {
88         ALOGE("%s: Can't unlock CameraMetadata with wrong pointer!",
89                 __FUNCTION__);
90         return BAD_VALUE;
91     }
92     mLocked = false;
93     return OK;
94 }
95 
release()96 camera_metadata_t* CameraMetadata::release() {
97     if (mLocked) {
98         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
99         return NULL;
100     }
101     camera_metadata_t *released = mBuffer;
102     mBuffer = NULL;
103     return released;
104 }
105 
clear()106 void CameraMetadata::clear() {
107     if (mLocked) {
108         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
109         return;
110     }
111     if (mBuffer) {
112         free_camera_metadata(mBuffer);
113         mBuffer = NULL;
114     }
115 }
116 
acquire(camera_metadata_t * buffer)117 void CameraMetadata::acquire(camera_metadata_t *buffer) {
118     if (mLocked) {
119         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
120         return;
121     }
122     clear();
123     mBuffer = buffer;
124 
125     ALOGE_IF(validate_camera_metadata_structure(mBuffer, /*size*/NULL) != OK,
126              "%s: Failed to validate metadata structure %p",
127              __FUNCTION__, buffer);
128 }
129 
acquire(CameraMetadata & other)130 void CameraMetadata::acquire(CameraMetadata &other) {
131     if (mLocked) {
132         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
133         return;
134     }
135     acquire(other.release());
136 }
137 
append(const CameraMetadata & other)138 status_t CameraMetadata::append(const CameraMetadata &other) {
139     return append(other.mBuffer);
140 }
141 
append(const camera_metadata_t * other)142 status_t CameraMetadata::append(const camera_metadata_t* other) {
143     if (mLocked) {
144         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
145         return INVALID_OPERATION;
146     }
147     size_t extraEntries = get_camera_metadata_entry_count(other);
148     size_t extraData = get_camera_metadata_data_count(other);
149     resizeIfNeeded(extraEntries, extraData);
150 
151     return append_camera_metadata(mBuffer, other);
152 }
153 
entryCount() const154 size_t CameraMetadata::entryCount() const {
155     return (mBuffer == NULL) ? 0 :
156             get_camera_metadata_entry_count(mBuffer);
157 }
158 
isEmpty() const159 bool CameraMetadata::isEmpty() const {
160     return entryCount() == 0;
161 }
162 
sort()163 status_t CameraMetadata::sort() {
164     if (mLocked) {
165         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
166         return INVALID_OPERATION;
167     }
168     return sort_camera_metadata(mBuffer);
169 }
170 
checkType(uint32_t tag,uint8_t expectedType)171 status_t CameraMetadata::checkType(uint32_t tag, uint8_t expectedType) {
172     int tagType = get_camera_metadata_tag_type(tag);
173     if ( CC_UNLIKELY(tagType == -1)) {
174         ALOGE("Update metadata entry: Unknown tag %d", tag);
175         return INVALID_OPERATION;
176     }
177     if ( CC_UNLIKELY(tagType != expectedType) ) {
178         ALOGE("Mismatched tag type when updating entry %s (%d) of type %s; "
179                 "got type %s data instead ",
180                 get_camera_metadata_tag_name(tag), tag,
181                 camera_metadata_type_names[tagType],
182                 camera_metadata_type_names[expectedType]);
183         return INVALID_OPERATION;
184     }
185     return OK;
186 }
187 
update(uint32_t tag,const int32_t * data,size_t data_count)188 status_t CameraMetadata::update(uint32_t tag,
189         const int32_t *data, size_t data_count) {
190     status_t res;
191     if (mLocked) {
192         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
193         return INVALID_OPERATION;
194     }
195     if ( (res = checkType(tag, TYPE_INT32)) != OK) {
196         return res;
197     }
198     return updateImpl(tag, (const void*)data, data_count);
199 }
200 
update(uint32_t tag,const uint8_t * data,size_t data_count)201 status_t CameraMetadata::update(uint32_t tag,
202         const uint8_t *data, size_t data_count) {
203     status_t res;
204     if (mLocked) {
205         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
206         return INVALID_OPERATION;
207     }
208     if ( (res = checkType(tag, TYPE_BYTE)) != OK) {
209         return res;
210     }
211     return updateImpl(tag, (const void*)data, data_count);
212 }
213 
update(uint32_t tag,const float * data,size_t data_count)214 status_t CameraMetadata::update(uint32_t tag,
215         const float *data, size_t data_count) {
216     status_t res;
217     if (mLocked) {
218         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
219         return INVALID_OPERATION;
220     }
221     if ( (res = checkType(tag, TYPE_FLOAT)) != OK) {
222         return res;
223     }
224     return updateImpl(tag, (const void*)data, data_count);
225 }
226 
update(uint32_t tag,const int64_t * data,size_t data_count)227 status_t CameraMetadata::update(uint32_t tag,
228         const int64_t *data, size_t data_count) {
229     status_t res;
230     if (mLocked) {
231         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
232         return INVALID_OPERATION;
233     }
234     if ( (res = checkType(tag, TYPE_INT64)) != OK) {
235         return res;
236     }
237     return updateImpl(tag, (const void*)data, data_count);
238 }
239 
update(uint32_t tag,const double * data,size_t data_count)240 status_t CameraMetadata::update(uint32_t tag,
241         const double *data, size_t data_count) {
242     status_t res;
243     if (mLocked) {
244         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
245         return INVALID_OPERATION;
246     }
247     if ( (res = checkType(tag, TYPE_DOUBLE)) != OK) {
248         return res;
249     }
250     return updateImpl(tag, (const void*)data, data_count);
251 }
252 
update(uint32_t tag,const camera_metadata_rational_t * data,size_t data_count)253 status_t CameraMetadata::update(uint32_t tag,
254         const camera_metadata_rational_t *data, size_t data_count) {
255     status_t res;
256     if (mLocked) {
257         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
258         return INVALID_OPERATION;
259     }
260     if ( (res = checkType(tag, TYPE_RATIONAL)) != OK) {
261         return res;
262     }
263     return updateImpl(tag, (const void*)data, data_count);
264 }
265 
update(uint32_t tag,const String8 & string)266 status_t CameraMetadata::update(uint32_t tag,
267         const String8 &string) {
268     status_t res;
269     if (mLocked) {
270         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
271         return INVALID_OPERATION;
272     }
273     if ( (res = checkType(tag, TYPE_BYTE)) != OK) {
274         return res;
275     }
276     // string.size() doesn't count the null termination character.
277     return updateImpl(tag, (const void*)string.string(), string.size() + 1);
278 }
279 
updateImpl(uint32_t tag,const void * data,size_t data_count)280 status_t CameraMetadata::updateImpl(uint32_t tag, const void *data,
281         size_t data_count) {
282     status_t res;
283     if (mLocked) {
284         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
285         return INVALID_OPERATION;
286     }
287     int type = get_camera_metadata_tag_type(tag);
288     if (type == -1) {
289         ALOGE("%s: Tag %d not found", __FUNCTION__, tag);
290         return BAD_VALUE;
291     }
292     size_t data_size = calculate_camera_metadata_entry_data_size(type,
293             data_count);
294 
295     res = resizeIfNeeded(1, data_size);
296 
297     if (res == OK) {
298         camera_metadata_entry_t entry;
299         res = find_camera_metadata_entry(mBuffer, tag, &entry);
300         if (res == NAME_NOT_FOUND) {
301             res = add_camera_metadata_entry(mBuffer,
302                     tag, data, data_count);
303         } else if (res == OK) {
304             res = update_camera_metadata_entry(mBuffer,
305                     entry.index, data, data_count, NULL);
306         }
307     }
308 
309     if (res != OK) {
310         ALOGE("%s: Unable to update metadata entry %s.%s (%x): %s (%d)",
311                 __FUNCTION__, get_camera_metadata_section_name(tag),
312                 get_camera_metadata_tag_name(tag), tag, strerror(-res), res);
313     }
314 
315     IF_ALOGV() {
316         ALOGE_IF(validate_camera_metadata_structure(mBuffer, /*size*/NULL) !=
317                  OK,
318 
319                  "%s: Failed to validate metadata structure after update %p",
320                  __FUNCTION__, mBuffer);
321     }
322 
323     return res;
324 }
325 
exists(uint32_t tag) const326 bool CameraMetadata::exists(uint32_t tag) const {
327     camera_metadata_ro_entry entry;
328     return find_camera_metadata_ro_entry(mBuffer, tag, &entry) == 0;
329 }
330 
find(uint32_t tag)331 camera_metadata_entry_t CameraMetadata::find(uint32_t tag) {
332     status_t res;
333     camera_metadata_entry entry;
334     if (mLocked) {
335         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
336         entry.count = 0;
337         return entry;
338     }
339     res = find_camera_metadata_entry(mBuffer, tag, &entry);
340     if (CC_UNLIKELY( res != OK )) {
341         entry.count = 0;
342         entry.data.u8 = NULL;
343     }
344     return entry;
345 }
346 
find(uint32_t tag) const347 camera_metadata_ro_entry_t CameraMetadata::find(uint32_t tag) const {
348     status_t res;
349     camera_metadata_ro_entry entry;
350     res = find_camera_metadata_ro_entry(mBuffer, tag, &entry);
351     if (CC_UNLIKELY( res != OK )) {
352         entry.count = 0;
353         entry.data.u8 = NULL;
354     }
355     return entry;
356 }
357 
erase(uint32_t tag)358 status_t CameraMetadata::erase(uint32_t tag) {
359     camera_metadata_entry_t entry;
360     status_t res;
361     if (mLocked) {
362         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
363         return INVALID_OPERATION;
364     }
365     res = find_camera_metadata_entry(mBuffer, tag, &entry);
366     if (res == NAME_NOT_FOUND) {
367         return OK;
368     } else if (res != OK) {
369         ALOGE("%s: Error looking for entry %s.%s (%x): %s %d",
370                 __FUNCTION__,
371                 get_camera_metadata_section_name(tag),
372                 get_camera_metadata_tag_name(tag), tag, strerror(-res), res);
373         return res;
374     }
375     res = delete_camera_metadata_entry(mBuffer, entry.index);
376     if (res != OK) {
377         ALOGE("%s: Error deleting entry %s.%s (%x): %s %d",
378                 __FUNCTION__,
379                 get_camera_metadata_section_name(tag),
380                 get_camera_metadata_tag_name(tag), tag, strerror(-res), res);
381     }
382     return res;
383 }
384 
dump(int fd,int verbosity,int indentation) const385 void CameraMetadata::dump(int fd, int verbosity, int indentation) const {
386     dump_indented_camera_metadata(mBuffer, fd, verbosity, indentation);
387 }
388 
resizeIfNeeded(size_t extraEntries,size_t extraData)389 status_t CameraMetadata::resizeIfNeeded(size_t extraEntries, size_t extraData) {
390     if (mBuffer == NULL) {
391         mBuffer = allocate_camera_metadata(extraEntries * 2, extraData * 2);
392         if (mBuffer == NULL) {
393             ALOGE("%s: Can't allocate larger metadata buffer", __FUNCTION__);
394             return NO_MEMORY;
395         }
396     } else {
397         size_t currentEntryCount = get_camera_metadata_entry_count(mBuffer);
398         size_t currentEntryCap = get_camera_metadata_entry_capacity(mBuffer);
399         size_t newEntryCount = currentEntryCount +
400                 extraEntries;
401         newEntryCount = (newEntryCount > currentEntryCap) ?
402                 newEntryCount * 2 : currentEntryCap;
403 
404         size_t currentDataCount = get_camera_metadata_data_count(mBuffer);
405         size_t currentDataCap = get_camera_metadata_data_capacity(mBuffer);
406         size_t newDataCount = currentDataCount +
407                 extraData;
408         newDataCount = (newDataCount > currentDataCap) ?
409                 newDataCount * 2 : currentDataCap;
410 
411         if (newEntryCount > currentEntryCap ||
412                 newDataCount > currentDataCap) {
413             camera_metadata_t *oldBuffer = mBuffer;
414             mBuffer = allocate_camera_metadata(newEntryCount,
415                     newDataCount);
416             if (mBuffer == NULL) {
417                 ALOGE("%s: Can't allocate larger metadata buffer", __FUNCTION__);
418                 return NO_MEMORY;
419             }
420             append_camera_metadata(mBuffer, oldBuffer);
421             free_camera_metadata(oldBuffer);
422         }
423     }
424     return OK;
425 }
426 
readFromParcel(const Parcel & data,camera_metadata_t ** out)427 status_t CameraMetadata::readFromParcel(const Parcel& data,
428                                         camera_metadata_t** out) {
429 
430     status_t err = OK;
431 
432     camera_metadata_t* metadata = NULL;
433 
434     if (out) {
435         *out = NULL;
436     }
437 
438     // See CameraMetadata::writeToParcel for parcel data layout diagram and explanation.
439     // arg0 = blobSize (int32)
440     int32_t blobSizeTmp = -1;
441     if ((err = data.readInt32(&blobSizeTmp)) != OK) {
442         ALOGE("%s: Failed to read metadata size (error %d %s)",
443               __FUNCTION__, err, strerror(-err));
444         return err;
445     }
446     const size_t blobSize = static_cast<size_t>(blobSizeTmp);
447     const size_t alignment = get_camera_metadata_alignment();
448 
449     // Special case: zero blob size means zero sized (NULL) metadata.
450     if (blobSize == 0) {
451         ALOGV("%s: Read 0-sized metadata", __FUNCTION__);
452         return OK;
453     }
454 
455     if (blobSize <= alignment) {
456         ALOGE("%s: metadata blob is malformed, blobSize(%zu) should be larger than alignment(%zu)",
457                 __FUNCTION__, blobSize, alignment);
458         return BAD_VALUE;
459     }
460 
461     const size_t metadataSize = blobSize - alignment;
462 
463     // NOTE: this doesn't make sense to me. shouldn't the blob
464     // know how big it is? why do we have to specify the size
465     // to Parcel::readBlob ?
466     ReadableBlob blob;
467     // arg1 = metadata (blob)
468     do {
469         if ((err = data.readBlob(blobSize, &blob)) != OK) {
470             ALOGE("%s: Failed to read metadata blob (sized %zu). Possible "
471                   " serialization bug. Error %d %s",
472                   __FUNCTION__, blobSize, err, strerror(-err));
473             break;
474         }
475 
476         // arg2 = offset (blob)
477         // Must be after blob since we don't know offset until after writeBlob.
478         int32_t offsetTmp;
479         if ((err = data.readInt32(&offsetTmp)) != OK) {
480             ALOGE("%s: Failed to read metadata offsetTmp (error %d %s)",
481                   __FUNCTION__, err, strerror(-err));
482             break;
483         }
484         const size_t offset = static_cast<size_t>(offsetTmp);
485         if (offset >= alignment) {
486             ALOGE("%s: metadata offset(%zu) should be less than alignment(%zu)",
487                     __FUNCTION__, blobSize, alignment);
488             err = BAD_VALUE;
489             break;
490         }
491 
492         const uintptr_t metadataStart = reinterpret_cast<uintptr_t>(blob.data()) + offset;
493         const camera_metadata_t* tmp =
494                        reinterpret_cast<const camera_metadata_t*>(metadataStart);
495         ALOGV("%s: alignment is: %zu, metadata start: %p, offset: %zu",
496                 __FUNCTION__, alignment, tmp, offset);
497         metadata = allocate_copy_camera_metadata_checked(tmp, metadataSize);
498         if (metadata == NULL) {
499             // We consider that allocation only fails if the validation
500             // also failed, therefore the readFromParcel was a failure.
501             ALOGE("%s: metadata allocation and copy failed", __FUNCTION__);
502             err = BAD_VALUE;
503         }
504     } while(0);
505     blob.release();
506 
507     if (out) {
508         ALOGV("%s: Set out metadata to %p", __FUNCTION__, metadata);
509         *out = metadata;
510     } else if (metadata != NULL) {
511         ALOGV("%s: Freed camera metadata at %p", __FUNCTION__, metadata);
512         free_camera_metadata(metadata);
513     }
514 
515     return err;
516 }
517 
writeToParcel(Parcel & data,const camera_metadata_t * metadata)518 status_t CameraMetadata::writeToParcel(Parcel& data,
519                                        const camera_metadata_t* metadata) {
520     status_t res = OK;
521 
522     /**
523      * Below is the camera metadata parcel layout:
524      *
525      * |--------------------------------------------|
526      * |             arg0: blobSize                 |
527      * |              (length = 4)                  |
528      * |--------------------------------------------|<--Skip the rest if blobSize == 0.
529      * |                                            |
530      * |                                            |
531      * |              arg1: blob                    |
532      * | (length = variable, see arg1 layout below) |
533      * |                                            |
534      * |                                            |
535      * |--------------------------------------------|
536      * |              arg2: offset                  |
537      * |              (length = 4)                  |
538      * |--------------------------------------------|
539      */
540 
541     // arg0 = blobSize (int32)
542     if (metadata == NULL) {
543         // Write zero blobSize for null metadata.
544         return data.writeInt32(0);
545     }
546 
547     /**
548      * Always make the blob size sufficiently larger, as we need put alignment
549      * padding and metadata into the blob. Since we don't know the alignment
550      * offset before writeBlob. Then write the metadata to aligned offset.
551      */
552     const size_t metadataSize = get_camera_metadata_compact_size(metadata);
553     const size_t alignment = get_camera_metadata_alignment();
554     const size_t blobSize = metadataSize + alignment;
555     res = data.writeInt32(static_cast<int32_t>(blobSize));
556     if (res != OK) {
557         return res;
558     }
559 
560     size_t offset = 0;
561     /**
562      * arg1 = metadata (blob).
563      *
564      * The blob size is the sum of front padding size, metadata size and back padding
565      * size, which is equal to metadataSize + alignment.
566      *
567      * The blob layout is:
568      * |------------------------------------|<----Start address of the blob (unaligned).
569      * |           front padding            |
570      * |          (size = offset)           |
571      * |------------------------------------|<----Aligned start address of metadata.
572      * |                                    |
573      * |                                    |
574      * |            metadata                |
575      * |       (size = metadataSize)        |
576      * |                                    |
577      * |                                    |
578      * |------------------------------------|
579      * |           back padding             |
580      * |     (size = alignment - offset)    |
581      * |------------------------------------|<----End address of blob.
582      *                                            (Blob start address + blob size).
583      */
584     WritableBlob blob;
585     do {
586         res = data.writeBlob(blobSize, &blob);
587         if (res != OK) {
588             break;
589         }
590         const uintptr_t metadataStart = ALIGN_TO(blob.data(), alignment);
591         offset = metadataStart - reinterpret_cast<uintptr_t>(blob.data());
592         ALOGV("%s: alignment is: %zu, metadata start: %p, offset: %zu",
593                 __FUNCTION__, alignment,
594                 reinterpret_cast<const void *>(metadataStart), offset);
595         copy_camera_metadata(reinterpret_cast<void*>(metadataStart), metadataSize, metadata);
596 
597         // Not too big of a problem since receiving side does hard validation
598         // Don't check the size since the compact size could be larger
599         if (validate_camera_metadata_structure(metadata, /*size*/NULL) != OK) {
600             ALOGW("%s: Failed to validate metadata %p before writing blob",
601                    __FUNCTION__, metadata);
602         }
603 
604     } while(false);
605     blob.release();
606 
607     // arg2 = offset (int32)
608     res = data.writeInt32(static_cast<int32_t>(offset));
609 
610     return res;
611 }
612 
readFromParcel(Parcel * parcel)613 status_t CameraMetadata::readFromParcel(Parcel *parcel) {
614 
615     ALOGV("%s: parcel = %p", __FUNCTION__, parcel);
616 
617     status_t res = OK;
618 
619     if (parcel == NULL) {
620         ALOGE("%s: parcel is null", __FUNCTION__);
621         return BAD_VALUE;
622     }
623 
624     if (mLocked) {
625         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
626         return INVALID_OPERATION;
627     }
628 
629     camera_metadata *buffer = NULL;
630     // TODO: reading should return a status code, in case validation fails
631     res = CameraMetadata::readFromParcel(*parcel, &buffer);
632 
633     if (res != NO_ERROR) {
634         ALOGE("%s: Failed to read from parcel. Metadata is unchanged.",
635               __FUNCTION__);
636         return res;
637     }
638 
639     clear();
640     mBuffer = buffer;
641 
642     return OK;
643 }
644 
writeToParcel(Parcel * parcel) const645 status_t CameraMetadata::writeToParcel(Parcel *parcel) const {
646 
647     ALOGV("%s: parcel = %p", __FUNCTION__, parcel);
648 
649     if (parcel == NULL) {
650         ALOGE("%s: parcel is null", __FUNCTION__);
651         return BAD_VALUE;
652     }
653 
654     return CameraMetadata::writeToParcel(*parcel, mBuffer);
655 }
656 
swap(CameraMetadata & other)657 void CameraMetadata::swap(CameraMetadata& other) {
658     if (mLocked) {
659         ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
660         return;
661     } else if (other.mLocked) {
662         ALOGE("%s: Other CameraMetadata is locked", __FUNCTION__);
663         return;
664     }
665 
666     camera_metadata* thisBuf = mBuffer;
667     camera_metadata* otherBuf = other.mBuffer;
668 
669     other.mBuffer = thisBuf;
670     mBuffer = otherBuf;
671 }
672 
673 }; // namespace android
674