geopackage-sdk/src/main/java/mil/nga/geopackage/extension/coverage/CoverageDataPngImage.java
public void flushStream() {
        if (outputStream != null) {
            if (imageBytes == null) {
                imageBytes = outputStream.toByteArray();
            }
            try {
                outputStream.close();
            } catch (IOException e) {
                Log.w(CoverageDataPngImage.class.getSimpleName(), "Failed to close output stream", e);
            }
        }
    }
public void flushStream() {
        if (outputStream != null) {
            if (imageBytes == null) {
                imageBytes = outputStream.toByteArray();
            }
            try {
                outputStream.close();
            } catch (IOException e) {
                Log.w(CoverageDataPngImage.class.getSimpleName(), "Failed to close output stream", e);
            }
        }
    }
Flush the output stream and set the image bytes, close the stream