link.cc

这是一个做pdf阅读器的源代码文件,是大家学习阅读器资料的很好参考

LinkDest::LinkDest(LinkDest *dest) {
  kind = dest->kind;
  pageIsRef = dest->pageIsRef;
  if (pageIsRef)
    pageRef = dest->pageRef;
  else
    pageNum = dest->pageNum;
  left = dest->left;
  bottom = dest->bottom;
  right = dest->right;
  top = dest->top;
  zoom = dest->zoom;
  changeLeft = dest->changeLeft;
  changeTop = dest->changeTop;
  changeZoom = dest->changeZoom;
  ok = gTrue;
}

//------------------------------------------------------------------------
// LinkGoTo
//------------------------------------------------------------------------

LinkGoTo::LinkGoTo(Object *destObj) {
  dest = NULL;
  namedDest = NULL;

  // named destination
  if (destObj->isName()) {
    namedDest = new GString(destObj->getName());
  } else if (destObj->isString()) {
    namedDest = destObj->getString()->copy();

  // destination dictionary
  } else if (destObj->isArray()) {
    dest = new LinkDest(destObj->getArray());
    if (!dest->isOk()) {
      delete dest;
      dest = NULL;
    }

  // error
  } else {
    error(-1, "Illegal annotation destination");
  }
}

LinkGoTo::~LinkGoTo() {
  if (dest)
    delete dest;
  if (namedDest)
    delete namedDest;
}

//------------------------------------------------------------------------
// LinkGoToR
//------------------------------------------------------------------------

LinkGoToR::LinkGoToR(Object *fileSpecObj, Object *destObj) {
  dest = NULL;
  namedDest = NULL;

  // get file name
  fileName = getFileSpecName(fileSpecObj);

  // named destination
  if (destObj->isName()) {
    namedDest = new GString(destObj->getName());
  } else if (destObj->isString()) {
    namedDest = destObj->getString()->copy();

  // destination dictionary
  } else if (destObj->isArray()) {
    dest = new LinkDest(destObj->getArray());
    if (!dest->isOk()) {
      delete dest;
      dest = NULL;
    }

  // error
  } else {
    error(-1, "Illegal annotation destination");
  }
}

LinkGoToR::~LinkGoToR() {
  if (fileName)
    delete fileName;
  if (dest)
    delete dest;
  if (namedDest)
    delete namedDest;
}


//------------------------------------------------------------------------
// LinkLaunch
//------------------------------------------------------------------------

LinkLaunch::LinkLaunch(Object *actionObj) {
  Object obj1, obj2;

  fileName = NULL;
  params = NULL;

  if (actionObj->isDict()) {
    if (!actionObj->dictLookup("F", &obj1)->isNull()) {
      fileName = getFileSpecName(&obj1);
    } else {
      obj1.free();
#ifdef WIN32
      if (actionObj->dictLookup("Win", &obj1)->isDict()) {
	obj1.dictLookup("F", &obj2);
	fileName = getFileSpecName(&obj2);
	obj2.free();
	if (obj1.dictLookup("P", &obj2)->isString()) {
	  params = obj2.getString()->copy();
	}
	obj2.free();
      } else {
	error(-1, "Bad launch-type link action");
      }
#else
      //~ This hasn't been defined by Adobe yet, so assume it looks
      //~ just like the Win dictionary until they say otherwise.
      if (actionObj->dictLookup("Unix", &obj1)->isDict()) {
	obj1.dictLookup("F", &obj2);
	fileName = getFileSpecName(&obj2);
	obj2.free();
	if (obj1.dictLookup("P", &obj2)->isString()) {
	  params = obj2.getString()->copy();
	}
	obj2.free();
      } else {
	error(-1, "Bad launch-type link action");
      }
#endif
    }
    obj1.free();
  }
}

LinkLaunch::~LinkLaunch() {
  if (fileName)
    delete fileName;
  if (params)
    delete params;
}

//------------------------------------------------------------------------
// LinkURI
//------------------------------------------------------------------------

LinkURI::LinkURI(Object *uriObj, GString *baseURI) {
  GString *uri2;
  int n;
  char c;

  uri = NULL;
  if (uriObj->isString()) {
    uri2 = uriObj->getString()->copy();
    if (baseURI && baseURI->getLength() > 0) {
      n = strcspn(uri2->getCString(), "/:");
      if (n == uri2->getLength() || uri2->getChar(n) == '/') {
	uri = baseURI->copy();
	c = uri->getChar(uri->getLength() - 1);
	if (c == '/' || c == '?') {
	  if (uri2->getChar(0) == '/') {
	    uri2->del(0);
	  }
	} else {
	  if (uri2->getChar(0) != '/') {
	    uri->append('/');
	  }
	}
	uri->append(uri2);
	delete uri2;
      } else {
	uri = uri2;
      }
    } else {
      uri = uri2;
    }
  } else {
    error(-1, "Illegal URI-type link");
  }
}

LinkURI::~LinkURI() {
  if (uri)
    delete uri;
}

//------------------------------------------------------------------------
// LinkNamed
//------------------------------------------------------------------------

LinkNamed::LinkNamed(Object *nameObj) {
  name = NULL;
  if (nameObj->isName()) {
    name = new GString(nameObj->getName());
  }
}

LinkNamed::~LinkNamed() {
  if (name) {
    delete name;
  }
}

//------------------------------------------------------------------------
// LinkMovie
//------------------------------------------------------------------------

LinkMovie::LinkMovie(Object *annotObj, Object *titleObj) {
  annotRef.num = -1;
  title = NULL;
  if (annotObj->isRef()) {
    annotRef = annotObj->getRef();
  } else if (titleObj->isString()) {
    title = titleObj->getString()->copy();
  } else {
    error(-1, "Movie action is missing both the Annot and T keys");
  }
}

LinkMovie::~LinkMovie() {
  if (title) {
    delete title;
  }
}

//------------------------------------------------------------------------
// LinkUnknown
//------------------------------------------------------------------------

LinkUnknown::LinkUnknown(char *actionA) {
  action = new GString(actionA);
}

LinkUnknown::~LinkUnknown() {
  delete action;
}

//------------------------------------------------------------------------
// Link
//------------------------------------------------------------------------

Link::Link(Dict *dict, GString *baseURI) {
  Object obj1, obj2;
  double t;

  action = NULL;
  ok = gFalse;

  // get rectangle
  if (!dict->lookup("Rect", &obj1)->isArray()) {
    error(-1, "Annotation rectangle is wrong type");
    goto err2;
  }
  if (!obj1.arrayGet(0, &obj2)->isNum()) {
    error(-1, "Bad annotation rectangle");
    goto err1;
  }
  x1 = obj2.getNum();
  obj2.free();
  if (!obj1.arrayGet(1, &obj2)->isNum()) {
    error(-1, "Bad annotation rectangle");
    goto err1;
  }
  y1 = obj2.getNum();
  obj2.free();
  if (!obj1.arrayGet(2, &obj2)->isNum()) {
    error(-1, "Bad annotation rectangle");
    goto err1;
  }
  x2 = obj2.getNum();
  obj2.free();
  if (!obj1.arrayGet(3, &obj2)->isNum()) {
    error(-1, "Bad annotation rectangle");
    goto err1;
  }
  y2 = obj2.getNum();
  obj2.free();
  obj1.free();
  if (x1 > x2) {
    t = x1;
    x1 = x2;
    x2 = t;
  }
  if (y1 > y2) {
    t = y1;
    y1 = y2;
    y2 = t;
  }

  // look for destination
  if (!dict->lookup("Dest", &obj1)->isNull()) {
    action = LinkAction::parseDest(&obj1);

  // look for action
  } else {
    obj1.free();
    if (dict->lookup("A", &obj1)->isDict()) {
      action = LinkAction::parseAction(&obj1, baseURI);
    }
  }
  obj1.free();

  // check for bad action
  if (action) {
    ok = gTrue;
  }

  return;

 err1:
  obj2.free();
 err2:
  obj1.free();
}

Link::~Link() {
  if (action) {
    delete action;
  }
}

//------------------------------------------------------------------------
// Links
//------------------------------------------------------------------------

Links::Links(Object *annots, GString *baseURI) {
  Link *link;
  Object obj1, obj2;
  int size;
  int i;

  links = NULL;
  size = 0;
  numLinks = 0;

  if (annots->isArray()) {
    for (i = 0; i < annots->arrayGetLength(); ++i) {
      if (annots->arrayGet(i, &obj1)->isDict()) {
	if (obj1.dictLookup("Subtype", &obj2)->isName("Link")) {
	  link = new Link(obj1.getDict(), baseURI);
	  if (link->isOk()) {
	    if (numLinks >= size) {
	      size += 16;
	      links = (Link **)greallocn(links, size, sizeof(Link *));
	    }
	    links[numLinks++] = link;
	  } else {
	    delete link;
	  }
	}
	obj2.free();
      }
      obj1.free();
    }
  }
}

Links::~Links() {
  int i;

  for (i = 0; i < numLinks; ++i)
    delete links[i];
  gfree(links);
}

LinkAction *Links::find(double x, double y) {
  int i;

  for (i = numLinks - 1; i >= 0; --i) {
    if (links[i]->inRect(x, y)) {
      return links[i]->getAction();
    }
  }
  return NULL;
}

GBool Links::onLink(double x, double y) {
  int i;

  for (i = 0; i < numLinks; ++i) {
    if (links[i]->inRect(x, y))
      return gTrue;
  }
  return gFalse;
}