private static int packBits()

in src/main/java/org/apache/xmlgraphics/image/codec/tiff/TIFFImageEncoder.java [1314:1360]
43 lines of code
15 McCabe index (conditional complexity)

    private static int packBits(byte[] input, int inOffset, int inCount,
                                byte[] output, int outOffset) {
        int inMax = inOffset + inCount - 1;
        int inMaxMinus1 = inMax - 1;

        while (inOffset <= inMax) {
            int run = 1;
            byte replicate = input[inOffset];
            while (run < 127 && inOffset < inMax
                  && input[inOffset] == input[inOffset + 1]) {
                run++;
                inOffset++;
            }
            if (run > 1) {
                inOffset++;
                output[outOffset++] = (byte)(-(run - 1));
                output[outOffset++] = replicate;
            }

            run = 0;
            int saveOffset = outOffset;
            while (run < 128
                  && ((inOffset < inMax
                    && input[inOffset] != input[inOffset + 1])
                   || (inOffset < inMaxMinus1
                    && input[inOffset] != input[inOffset + 2]))) {
                run++;
                output[++outOffset] = input[inOffset++];
            }
            if (run > 0) {
                output[saveOffset] = (byte)(run - 1);
                outOffset++;
            }

            if (inOffset == inMax) {
                if (run > 0 && run < 128) {
                    output[saveOffset]++;
                    output[outOffset++] = input[inOffset++];
                } else {
                    output[outOffset++] = (byte)0;
                    output[outOffset++] = input[inOffset++];
                }
            }
        }

        return outOffset;
    }