72           mCachedOffset(0), mCachedSize(0), mCacheBufferSize(0) {}  in HeifDataSource()
105     off64_t mCachedOffset;  member in android::HeifDataSource
130     if (offset < mCachedOffset) {  in readAt()
134             mCachedOffset = offset;  in readAt()
139             mCachedOffset = 0;  in readAt()
148     if (mEOS && (offset < mCachedOffset ||  in readAt()
149                  offset >= (off64_t)(mCachedOffset + mCachedSize))) {  in readAt()
156     CHECK(offset >= mCachedOffset);  in readAt()
173     if (offset + size <= mCachedOffset + mCachedSize) {  in readAt()
174         memcpy(mMemory->unsecurePointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()
179     if ((off64_t)(offset + size) > mCachedOffset + kMaxCacheBufferSize) {  in readAt()
194         if (newCachedOffset < mCachedOffset) {  in readAt()
195             newCachedOffset = mCachedOffset;  in readAt()
198         int64_t newCachedSize = (int64_t)(mCachedOffset + mCachedSize) - newCachedOffset;  in readAt()
203             memcpy(dst, mCache.get() + newCachedOffset - mCachedOffset, newCachedSize);  in readAt()
216                 mCachedOffset = newCachedOffset;  in readAt()
228         mCachedOffset = newCachedOffset;  in readAt()
232                 (long long)mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
236         while (offset + size > mCachedOffset + newCacheBufferSize) {  in readAt()
247                     (long long) mCachedOffset, mCachedSize, mCacheBufferSize);  in readAt()
250     size_t bytesToRead = offset + size - mCachedOffset - mCachedSize;  in readAt()
262             (long long) mCachedOffset, mCachedSize);  in readAt()
265     int64_t bytesAvailable = mCachedOffset + mCachedSize - offset;  in readAt()
272     memcpy(mMemory->unsecurePointer(), mCache.get() + offset - mCachedOffset, size);  in readAt()