static int checkBuf()

in tjunittest.c [212:306]
89 lines of code
22 McCabe index (conditional complexity)

static int checkBuf(void *buf, int w, int h, int pf,  int subsamp,
                    tjscalingfactor sf, int bottomUp)
{
  int roffset = tjRedOffset[pf];
  int goffset = tjGreenOffset[pf];
  int boffset = tjBlueOffset[pf];
  int aoffset = tjAlphaOffset[pf];
  int ps = tjPixelSize[pf];
  int index, row, col, retval = 1;
  int halfway = 16 * sf.num / sf.denom;
  int blocksize = 8 * sf.num / sf.denom;

  if (pf == TJPF_GRAY) roffset = goffset = boffset = 0;

  if (pf == TJPF_CMYK) {
    for (row = 0; row < h; row++) {
      for (col = 0; col < w; col++) {
        int c, m, y, k;

        if (bottomUp) index = (h - row - 1) * w + col;
        else index = row * w + col;
        c = getVal(buf, index * ps);
        m = getVal(buf, index * ps + 1);
        y = getVal(buf, index * ps + 2);
        k = getVal(buf, index * ps + 3);
        if (((row / blocksize) + (col / blocksize)) % 2 == 0) {
          CHECKVALMAX(c);  CHECKVALMAX(m);  CHECKVALMAX(y);
          if (row < halfway) CHECKVALMAX(k)
          else CHECKVAL0(k)
        } else {
          CHECKVALMAX(c);  CHECKVAL0(y);  CHECKVALMAX(k);
          if (row < halfway) CHECKVAL0(m)
          else CHECKVALMAX(m)
        }
      }
    }
    return 1;
  }

  for (row = 0; row < h; row++) {
    for (col = 0; col < w; col++) {
      int r, g, b, a;

      if (bottomUp) index = (h - row - 1) * w + col;
      else index = row * w + col;
      r = getVal(buf, index * ps + roffset);
      g = getVal(buf, index * ps + goffset);
      b = getVal(buf, index * ps + boffset);
      a = aoffset >= 0 ? getVal(buf, index * ps + aoffset) : maxSample;
      if (((row / blocksize) + (col / blocksize)) % 2 == 0) {
        if (row < halfway) {
          CHECKVALMAX(r);  CHECKVALMAX(g);  CHECKVALMAX(b);
        } else {
          CHECKVAL0(r);  CHECKVAL0(g);  CHECKVAL0(b);
        }
      } else {
        if (subsamp == TJSAMP_GRAY) {
          if (row < halfway) {
            CHECKVAL(r, redToY);  CHECKVAL(g, redToY);  CHECKVAL(b, redToY);
          } else {
            CHECKVAL(r, yellowToY);  CHECKVAL(g, yellowToY);
            CHECKVAL(b, yellowToY);
          }
        } else {
          if (row < halfway) {
            CHECKVALMAX(r);  CHECKVAL0(g);  CHECKVAL0(b);
          } else {
            CHECKVALMAX(r);  CHECKVALMAX(g);  CHECKVAL0(b);
          }
        }
      }
      CHECKVALMAX(a);
    }
  }

bailout:
  if (retval == 0) {
    for (row = 0; row < h; row++) {
      for (col = 0; col < w; col++) {
        if (pf == TJPF_CMYK)
          printf("%.3d/%.3d/%.3d/%.3d ", getVal(buf, (row * w + col) * ps),
                 getVal(buf, (row * w + col) * ps + 1),
                 getVal(buf, (row * w + col) * ps + 2),
                 getVal(buf, (row * w + col) * ps + 3));
        else
          printf("%.3d/%.3d/%.3d ",
                 getVal(buf, (row * w + col) * ps + roffset),
                 getVal(buf, (row * w + col) * ps + goffset),
                 getVal(buf, (row * w + col) * ps + boffset));
      }
      printf("\n");
    }
  }
  return retval;
}