Merge "stagefright: TinyCacheSource to read continuously" into mnc-dev

    }

    // Check if the cache satisfies the read.

    if (offset >= mCachedOffset && offset + size <= mCachedOffset + mCachedSize) {

    if (mCachedOffset <= offset && offset < mCachedOffset + mCachedSize) {

        if (offset + size <= mCachedOffset + mCachedSize) {

            memcpy(data, &mCache[offset - mCachedOffset], size);

            return size;

        } else {

            // If the cache hits only partially, flush the cache and read the

            // remainder.

            // This value is guaranteed to be greater than 0 because of the

            // enclosing if statement.

            const ssize_t remaining = mCachedOffset + mCachedSize - offset;

            memcpy(data, &mCache[offset - mCachedOffset], remaining);

            const ssize_t readMore = readAt(offset + remaining,

                    (uint8_t*)data + remaining, size - remaining);

            if (readMore < 0) {

                return readMore;

            }

            return remaining + readMore;

        }

    }

    // Fill the cache and copy to the caller.