Method unpack

ij/src/main/java/ij/plugin/BMP_Reader.java:217–245

(byte[] rawData, int rawOffset, int bpp, byte[] byteData, int byteOffset, int w)

        }

        void unpack(byte[] rawData, int rawOffset, int bpp, byte[] byteData, int byteOffset, int w) throws Exception {
                int j = byteOffset;
                int k = rawOffset;
                byte mask;
                int pixPerByte;

                switch (bpp) {
                case 1: mask = (byte)0x01; pixPerByte = 8; break;
                case 4: mask = (byte)0x0f; pixPerByte = 2; break;
                case 8: mask = (byte)0xff; pixPerByte = 1; break;
                default:
                        throw new Exception("Unsupported bits-per-pixel value: " + bpp);
                }

                for (int i = 0;;) {
                        int shift = 8 - bpp;
                        for (int ii = 0; ii < pixPerByte; ii++) {
                                byte br = rawData[k];
                                br >>= shift;
                                byteData[j] = (byte)(br & mask);
                                //System.out.println("Setting byteData[" + j + "]=" + Test.byteToHex(byteData[j]));
                                j++;
                                i++;
                                if (i == w) return;
                                shift -= bpp;
                        }
                        k++;
                }
        }

        void unpack24(byte[] rawData, int rawOffset, int[] intData, int intOffset, int w) {
                int j = intOffset;