71           mCachedOffset(0), mCachedSize(0), mCacheBufferSize(0) {}  in HeifDataSource()
104     off64_t mCachedOffset;  member in android::HeifDataSource
129     if (offset < mCachedOffset) {  in readAt()
133             mCachedOffset = offset;  in readAt()
138             mCachedOffset = 0;  in readAt()
147     if (mEOS && (offset < mCachedOffset ||  in readAt()
148                  offset >= (off64_t)(mCachedOffset + mCachedSize))) {  in readAt()
155     CHECK(offset >= mCachedOffset);  in readAt()
172     if (offset + size <= mCachedOffset + mCachedSize) {  in readAt()
173         memcpy(mMemory->unsecurePointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()
178     if ((off64_t)(offset + size) > mCachedOffset + kMaxCacheBufferSize) {  in readAt()
193         if (newCachedOffset < mCachedOffset) {  in readAt()
194             newCachedOffset = mCachedOffset;  in readAt()
197         int64_t newCachedSize = (int64_t)(mCachedOffset + mCachedSize) - newCachedOffset;  in readAt()
202             memcpy(dst, mCache.get() + newCachedOffset - mCachedOffset, newCachedSize);  in readAt()
215                 mCachedOffset = newCachedOffset;  in readAt()
227         mCachedOffset = newCachedOffset;  in readAt()
231                 (long long)mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
235         while (offset + size > mCachedOffset + newCacheBufferSize) {  in readAt()
246                     (long long) mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
249     size_t bytesToRead = offset + size - mCachedOffset - mCachedSize;  in readAt()
261             (long long) mCachedOffset, mCachedSize);  in readAt()
264     int64_t bytesAvailable = mCachedOffset + mCachedSize - offset;  in readAt()
271     memcpy(mMemory->unsecurePointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()