54           mCachedOffset(0), mCachedSize(0), mCacheBufferSize(0) {}  in HeifDataSource()
87     off64_t mCachedOffset;  member in android::HeifDataSource
112     if (offset < mCachedOffset) {  in readAt()
116             mCachedOffset = offset;  in readAt()
121             mCachedOffset = 0;  in readAt()
130     if (mEOS && (offset < mCachedOffset ||  in readAt()
131                  offset >= (off64_t)(mCachedOffset + mCachedSize))) {  in readAt()
138     CHECK(offset >= mCachedOffset);  in readAt()
155     if (offset + size <= mCachedOffset + mCachedSize) {  in readAt()
156         memcpy(mMemory->pointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()
161     if ((off64_t)(offset + size) > mCachedOffset + kMaxCacheBufferSize) {  in readAt()
176         if (newCachedOffset < mCachedOffset) {  in readAt()
177             newCachedOffset = mCachedOffset;  in readAt()
180         int64_t newCachedSize = (int64_t)(mCachedOffset + mCachedSize) - newCachedOffset;  in readAt()
185             memcpy(dst, mCache.get() + newCachedOffset - mCachedOffset, newCachedSize);  in readAt()
198                 mCachedOffset = newCachedOffset;  in readAt()
210         mCachedOffset = newCachedOffset;  in readAt()
214                 (long long)mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
218         while (offset + size > mCachedOffset + newCacheBufferSize) {  in readAt()
229                     (long long) mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
232     size_t bytesToRead = offset + size - mCachedOffset - mCachedSize;  in readAt()
244             (long long) mCachedOffset, mCachedSize);  in readAt()
247     int64_t bytesAvailable = mCachedOffset + mCachedSize - offset;  in readAt()
254     memcpy(mMemory->pointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()