static void staticCopyRange()

in src/main/java/org/apache/sling/servlets/get/impl/helpers/StreamRenderer.java [559:590]

• 27 lines of code
• 6 McCabe index (conditional complexity)

    static void staticCopyRange(InputStream istream,
            OutputStream ostream, long start, long end) throws IOException {
        long position = 0;
        byte buffer[] = new byte[IO_BUFFER_SIZE];

        while (position < start) {
            long skipped = istream.skip(start - position);
            if (skipped == 0) {
                // skip() may return zero if for whatever reason it wasn't
                // able to advance the stream. In such cases we need to
                // fall back to read() to force the skipping of bytes.
                int len = (int) Math.min(start - position, buffer.length);
                skipped = istream.read(buffer, 0, len);
                if (skipped == -1) {
                    throw new IOException("Failed to skip " + start
                            + " bytes; only skipped " + position + " bytes");
                }
            }
            position += skipped;
        }

        while (position < end) {
            int len = (int) Math.min(end - position, buffer.length);
            int read = istream.read(buffer, 0, len);
            if (read != -1) {
                position += read;
                ostream.write(buffer, 0, read);
            } else {
                break;
            }
        }
    }