huh.c

  size_t chunk_len;
  char *chunk;
  int offset;
  size_t length;
  size_t nparsed;

  if (!JS_ConvertArguments(cx, argc, JS_ARGV(cx, vp), "Sii", &str, &offset, &length)) {
    return JS_FALSE;
  }
  chunk_len = JS_GetStringEncodingLength(cx, str);
  chunk = (char*)malloc(chunk_len);
  chunk_len = JS_EncodeStringToBuffer(str, chunk, chunk_len); 

  this = JS_THIS_OBJECT(cx, vp);
  parser = (http_parser*)JS_GetInstancePrivate(cx, this, &HttpParser_class, NULL);

  if (offset < 0 || offset > chunk_len) {
    JS_ReportError(cx, "Offset is out of bounds");
    free(chunk);
    return JS_FALSE;
  }
  printf("length %d, chunk_len %d, offset %d\n", (int)length, (int)chunk_len, (int)offset);
  printf("chunk_len - offset %d\n", (int)(chunk_len - offset));
  if (length < 0) printf("length < 0\n");
  if (length > (chunk_len - offset)) printf("(length > (chunk_len - offset))\n");
  if ((length < 0) || (length > (chunk_len - offset))) {
    JS_ReportError(cx, "Invalid length or length extends beyond end of chunk");
    free(chunk);
    return JS_FALSE;
  }