public int read()

in src/main/java/org/apache/commons/crypto/stream/CtrCryptoInputStream.java [520:554]

• 30 lines of code
• 7 McCabe index (conditional complexity)

    public int read(final ByteBuffer buf) throws IOException {
        checkStream();
        int unread = outBuffer.remaining();
        if (unread <= 0) { // Fill the unread decrypted data buffer firstly
            final int n = input.read(inBuffer);
            if (n <= 0) {
                return n;
            }

            streamOffset += n; // Read n bytes
            if (buf.isDirect() && buf.remaining() >= inBuffer.position()
                    && padding == 0) {
                // Use buf as the output buffer directly
                decryptInPlace(buf);
                padding = postDecryption(streamOffset);
                return n;
            }
            // Use outBuffer as the output buffer
            decrypt();
            padding = postDecryption(streamOffset);
        }

        // Copy decrypted data from outBuffer to buf
        unread = outBuffer.remaining();
        final int toRead = buf.remaining();
        if (toRead <= unread) {
            final int limit = outBuffer.limit();
            outBuffer.limit(outBuffer.position() + toRead);
            buf.put(outBuffer);
            outBuffer.limit(limit);
            return toRead;
        }
        buf.put(outBuffer);
        return unread;
    }