54           mCachedOffset(0), mCachedSize(0), mCacheBufferSize(0) {}  in HeifDataSource()
90     off64_t mCachedOffset;  member in android::HeifDataSource
115     if (offset < mCachedOffset) {  in readAt()
119             mCachedOffset = offset;  in readAt()
124             mCachedOffset = 0;  in readAt()
133     if (mEOS && (offset < mCachedOffset ||  in readAt()
134                  offset >= (off64_t)(mCachedOffset + mCachedSize))) {  in readAt()
141     CHECK(offset >= mCachedOffset);  in readAt()
158     if (offset + size <= mCachedOffset + mCachedSize) {  in readAt()
159         memcpy(mMemory->pointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()
164     if ((off64_t)(offset + size) > mCachedOffset + kMaxCacheBufferSize) {  in readAt()
179         if (newCachedOffset < mCachedOffset) {  in readAt()
180             newCachedOffset = mCachedOffset;  in readAt()
183         int64_t newCachedSize = (int64_t)(mCachedOffset + mCachedSize) - newCachedOffset;  in readAt()
188             memcpy(dst, mCache.get() + newCachedOffset - mCachedOffset, newCachedSize);  in readAt()
201                 mCachedOffset = newCachedOffset;  in readAt()
213         mCachedOffset = newCachedOffset;  in readAt()
217                 (long long)mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
221         while (offset + size > mCachedOffset + newCacheBufferSize) {  in readAt()
232                     (long long) mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
235     size_t bytesToRead = offset + size - mCachedOffset - mCachedSize;  in readAt()
247             (long long) mCachedOffset, mCachedSize);  in readAt()
250     int64_t bytesAvailable = mCachedOffset + mCachedSize - offset;  in readAt()
257     memcpy(mMemory->pointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()