static jbyteArray android_os_Parcel_readBlob(JNIEnv* env, jclass clazz, jlong nativePtr)
{
jbyteArray ret = NULL;
Parcel* parcel = reinterpret_cast<Parcel*>(nativePtr);
if (parcel != NULL) {
int32_t len = parcel->readInt32();
if (len >= 0) {
android::Parcel::ReadableBlob blob;
android::status_t err = parcel->readBlob(len, &blob);
if (err != NO_ERROR) {
signalExceptionForError(env, clazz, err);
return NULL;
}
ret = env->NewByteArray(len);
if (ret != NULL) {
jbyte* a2 = (jbyte*)env->GetPrimitiveArrayCritical(ret, 0);
if (a2) {
memcpy(a2, blob.data(), len);
env->ReleasePrimitiveArrayCritical(ret, a2, 0);
}
}
blob.release();
}
}
return ret;
}
status_t CameraMetadata::readFromParcel(const Parcel& data,
camera_metadata_t** out) {
status_t err = OK;
camera_metadata_t* metadata = NULL;
if (out) {
*out = NULL;
}
// See CameraMetadata::writeToParcel for parcel data layout diagram and explanation.
// arg0 = blobSize (int32)
int32_t blobSizeTmp = -1;
if ((err = data.readInt32(&blobSizeTmp)) != OK) {
ALOGE("%s: Failed to read metadata size (error %d %s)",
__FUNCTION__, err, strerror(-err));
return err;
}
const size_t blobSize = static_cast<size_t>(blobSizeTmp);
const size_t alignment = get_camera_metadata_alignment();
// Special case: zero blob size means zero sized (NULL) metadata.
if (blobSize == 0) {
ALOGV("%s: Read 0-sized metadata", __FUNCTION__);
return OK;
}
if (blobSize <= alignment) {
ALOGE("%s: metadata blob is malformed, blobSize(%zu) should be larger than alignment(%zu)",
__FUNCTION__, blobSize, alignment);
return BAD_VALUE;
}
const size_t metadataSize = blobSize - alignment;
// NOTE: this doesn't make sense to me. shouldn't the blob
// know how big it is? why do we have to specify the size
// to Parcel::readBlob ?
ReadableBlob blob;
// arg1 = metadata (blob)
do {
if ((err = data.readBlob(blobSize, &blob)) != OK) {
ALOGE("%s: Failed to read metadata blob (sized %zu). Possible "
" serialization bug. Error %d %s",
__FUNCTION__, blobSize, err, strerror(-err));
break;
}
// arg2 = offset (blob)
// Must be after blob since we don't know offset until after writeBlob.
int32_t offsetTmp;
if ((err = data.readInt32(&offsetTmp)) != OK) {
ALOGE("%s: Failed to read metadata offsetTmp (error %d %s)",
__FUNCTION__, err, strerror(-err));
break;
}
const size_t offset = static_cast<size_t>(offsetTmp);
if (offset >= alignment) {
ALOGE("%s: metadata offset(%zu) should be less than alignment(%zu)",
__FUNCTION__, blobSize, alignment);
err = BAD_VALUE;
break;
}
const uintptr_t metadataStart = reinterpret_cast<uintptr_t>(blob.data()) + offset;
const camera_metadata_t* tmp =
reinterpret_cast<const camera_metadata_t*>(metadataStart);
ALOGV("%s: alignment is: %zu, metadata start: %p, offset: %zu",
__FUNCTION__, alignment, tmp, offset);
metadata = allocate_copy_camera_metadata_checked(tmp, metadataSize);
if (metadata == NULL) {
// We consider that allocation only fails if the validation
// also failed, therefore the readFromParcel was a failure.
ALOGE("%s: metadata allocation and copy failed", __FUNCTION__);
err = BAD_VALUE;
}
} while(0);
blob.release();
if (out) {
ALOGV("%s: Set out metadata to %p", __FUNCTION__, metadata);
*out = metadata;
} else if (metadata != NULL) {
ALOGV("%s: Freed camera metadata at %p", __FUNCTION__, metadata);
free_camera_metadata(metadata);
}
return err;
}