void encode()

in kerby-common/kerby-util/src/main/java/org/apache/kerby/util/Base64.java [447:510]
59 lines of code
18 McCabe index (conditional complexity)

    void encode(byte[] in, int inPos, int inAvail) {
        if (eof) {
            return;
        }
        // inAvail < 0 is how we're informed of EOF in the underlying data we're
        // encoding.
        if (inAvail < 0) {
            eof = true;
            if (buffer == null || buffer.length - pos < encodeSize) {
                resizeBuffer();
            }
            switch (modulus) {
                case 1 :
                    buffer[pos++] = encodeTable[(x >> 2) & MASK_6BITS];
                    buffer[pos++] = encodeTable[(x << 4) & MASK_6BITS];
                    // URL-SAFE skips the padding to further reduce size.
                    if (encodeTable == STANDARD_ENCODE_TABLE) {
                        buffer[pos++] = PAD;
                        buffer[pos++] = PAD;
                    }
                    break;

                case 2 :
                    buffer[pos++] = encodeTable[(x >> 10) & MASK_6BITS];
                    buffer[pos++] = encodeTable[(x >> 4) & MASK_6BITS];
                    buffer[pos++] = encodeTable[(x << 2) & MASK_6BITS];
                    // URL-SAFE skips the padding to further reduce size.
                    if (encodeTable == STANDARD_ENCODE_TABLE) {
                        buffer[pos++] = PAD;
                    }
                    break;
                default:
                    break;
            }
            if (lineLength > 0 && pos > 0) {
                System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
                pos += lineSeparator.length;
            }
        } else {
            for (int i = 0; i < inAvail; i++) {
                if (buffer == null || buffer.length - pos < encodeSize) {
                    resizeBuffer();
                }
                modulus = (++modulus) % 3;
                int b = in[inPos++];
                if (b < 0) {
                    b += 256;
                }
                x = (x << 8) + b;
                if (0 == modulus) {
                    buffer[pos++] = encodeTable[(x >> 18) & MASK_6BITS];
                    buffer[pos++] = encodeTable[(x >> 12) & MASK_6BITS];
                    buffer[pos++] = encodeTable[(x >> 6) & MASK_6BITS];
                    buffer[pos++] = encodeTable[x & MASK_6BITS];
                    currentLinePos += 4;
                    if (lineLength > 0 && lineLength <= currentLinePos) {
                        System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
                        pos += lineSeparator.length;
                        currentLinePos = 0;
                    }
                }
            }
        }
    }