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

//========================================================================
//
// Link.cc
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <stddef.h>
#include <string.h>
#include "gmem.h"
#include "GString.h"
#include "Error.h"
#include "Object.h"
#include "Array.h"
#include "Dict.h"
#include "Link.h"

//------------------------------------------------------------------------
// LinkAction
//------------------------------------------------------------------------

LinkAction *LinkAction::parseDest(Object *obj) {
  LinkAction *action;

  action = new LinkGoTo(obj);
  if (!action->isOk()) {
    delete action;
    return NULL;
  }
  return action;
}

LinkAction *LinkAction::parseAction(Object *obj, GString *baseURI) {
  LinkAction *action;
  Object obj2, obj3, obj4;

  if (!obj->isDict()) {
    error(-1, "Bad annotation action");
    return NULL;
  }

  obj->dictLookup("S", &obj2);

  // GoTo action
  if (obj2.isName("GoTo")) {
    obj->dictLookup("D", &obj3);
    action = new LinkGoTo(&obj3);
    obj3.free();

  // GoToR action
  } else if (obj2.isName("GoToR")) {
    obj->dictLookup("F", &obj3);
    obj->dictLookup("D", &obj4);
    action = new LinkGoToR(&obj3, &obj4);
    obj3.free();
    obj4.free();

  // Launch action
  } else if (obj2.isName("Launch")) {
    action = new LinkLaunch(obj);

  // URI action
  } else if (obj2.isName("URI")) {
    obj->dictLookup("URI", &obj3);
    action = new LinkURI(&obj3, baseURI);
    obj3.free();

  // Named action
  } else if (obj2.isName("Named")) {
    obj->dictLookup("N", &obj3);
    action = new LinkNamed(&obj3);
    obj3.free();

  // Movie action
  } else if (obj2.isName("Movie")) {
    obj->dictLookupNF("Annot", &obj3);
    obj->dictLookup("T", &obj4);
    action = new LinkMovie(&obj3, &obj4);
    obj3.free();
    obj4.free();

  // unknown action
  } else if (obj2.isName()) {
    action = new LinkUnknown(obj2.getName());

  // action is missing or wrong type
  } else {
    error(-1, "Bad annotation action");
    action = NULL;
  }

  obj2.free();

  if (action && !action->isOk()) {
    delete action;
    return NULL;
  }
  return action;
}

GString *LinkAction::getFileSpecName(Object *fileSpecObj) {
  GString *name;
  Object obj1;

  name = NULL;

  // string
  if (fileSpecObj->isString()) {
    name = fileSpecObj->getString()->copy();

  // dictionary
  } else if (fileSpecObj->isDict()) {
#ifdef WIN32
    if (!fileSpecObj->dictLookup("DOS", &obj1)->isString()) {
#else
    if (!fileSpecObj->dictLookup("Unix", &obj1)->isString()) {
#endif
      obj1.free();
      fileSpecObj->dictLookup("F", &obj1);
    }
    if (obj1.isString()) {
      name = obj1.getString()->copy();
    } else {
      error(-1, "Illegal file spec in link");
    }
    obj1.free();

  // error
  } else {
    error(-1, "Illegal file spec in link");
  }

  // system-dependent path manipulation
  if (name) {
#ifdef WIN32
    int i, j;

    // "//...."             --> "\...."
    // "/x/...."            --> "x:\...."
    // "/server/share/...." --> "\\server\share\...."
    // convert escaped slashes to slashes and unescaped slashes to backslashes
    i = 0;
    if (name->getChar(0) == '/') {
      if (name->getLength() >= 2 && name->getChar(1) == '/') {
	name->del(0);
	i = 0;
      } else if (name->getLength() >= 2 &&
		 ((name->getChar(1) >= 'a' && name->getChar(1) <= 'z') ||
		  (name->getChar(1) >= 'A' && name->getChar(1) <= 'Z')) &&
		 (name->getLength() == 2 || name->getChar(2) == '/')) {
	name->setChar(0, name->getChar(1));
	name->setChar(1, ':');
	i = 2;
      } else {
	for (j = 2; j < name->getLength(); ++j) {
	  if (name->getChar(j-1) != '\\' &&
	      name->getChar(j) == '/') {
	    break;
	  }
	}
	if (j < name->getLength()) {
	  name->setChar(0, '\\');
	  name->insert(0, '\\');
	  i = 2;
	}
      }
    }
    for (; i < name->getLength(); ++i) {
      if (name->getChar(i) == '/') {
	name->setChar(i, '\\');
      } else if (name->getChar(i) == '\\' &&
		 i+1 < name->getLength() &&
		 name->getChar(i+1) == '/') {
	name->del(i);
      }
    }
#else
    // no manipulation needed for Unix
#endif
  }

  return name;
}

//------------------------------------------------------------------------
// LinkDest
//------------------------------------------------------------------------

LinkDest::LinkDest(Array *a) {
  Object obj1, obj2;

  // initialize fields
  left = bottom = right = top = zoom = 0;
  ok = gFalse;

  // get page
  if (a->getLength() < 2) {
    error(-1, "Annotation destination array is too short");
    return;
  }
  a->getNF(0, &obj1);
  if (obj1.isInt()) {
    pageNum = obj1.getInt() + 1;
    pageIsRef = gFalse;
  } else if (obj1.isRef()) {
    pageRef.num = obj1.getRefNum();
    pageRef.gen = obj1.getRefGen();
    pageIsRef = gTrue;
  } else {
    error(-1, "Bad annotation destination");
    goto err2;
  }
  obj1.free();

  // get destination type
  a->get(1, &obj1);

  // XYZ link
  if (obj1.isName("XYZ")) {
    kind = destXYZ;
    if (a->getLength() < 3) {
      changeLeft = gFalse;
    } else {
      a->get(2, &obj2);
      if (obj2.isNull()) {
	changeLeft = gFalse;
      } else if (obj2.isNum()) {
	changeLeft = gTrue;
	left = obj2.getNum();
      } else {
	error(-1, "Bad annotation destination position");
	goto err1;
      }
      obj2.free();
    }
    if (a->getLength() < 4) {
      changeTop = gFalse;
    } else {
      a->get(3, &obj2);
      if (obj2.isNull()) {
	changeTop = gFalse;
      } else if (obj2.isNum()) {
	changeTop = gTrue;
	top = obj2.getNum();
      } else {
	error(-1, "Bad annotation destination position");
	goto err1;
      }
      obj2.free();
    }
    if (a->getLength() < 5) {
      changeZoom = gFalse;
    } else {
      a->get(4, &obj2);
      if (obj2.isNull()) {
	changeZoom = gFalse;
      } else if (obj2.isNum()) {
	changeZoom = gTrue;
	zoom = obj2.getNum();
      } else {
	error(-1, "Bad annotation destination position");
	goto err1;
      }
      obj2.free();
    }

  // Fit link
  } else if (obj1.isName("Fit")) {
    if (a->getLength() < 2) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFit;

  // FitH link
  } else if (obj1.isName("FitH")) {
    if (a->getLength() < 3) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFitH;
    if (!a->get(2, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    top = obj2.getNum();
    obj2.free();

  // FitV link
  } else if (obj1.isName("FitV")) {
    if (a->getLength() < 3) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFitV;
    if (!a->get(2, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    left = obj2.getNum();
    obj2.free();

  // FitR link
  } else if (obj1.isName("FitR")) {
    if (a->getLength() < 6) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFitR;
    if (!a->get(2, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    left = obj2.getNum();
    obj2.free();
    if (!a->get(3, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    bottom = obj2.getNum();
    obj2.free();
    if (!a->get(4, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    right = obj2.getNum();
    obj2.free();
    if (!a->get(5, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    top = obj2.getNum();
    obj2.free();

  // FitB link
  } else if (obj1.isName("FitB")) {
    if (a->getLength() < 2) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFitB;

  // FitBH link
  } else if (obj1.isName("FitBH")) {
    if (a->getLength() < 3) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFitBH;
    if (!a->get(2, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    top = obj2.getNum();
    obj2.free();

  // FitBV link
  } else if (obj1.isName("FitBV")) {
    if (a->getLength() < 3) {
      error(-1, "Annotation destination array is too short");
      goto err2;
    }
    kind = destFitBV;
    if (!a->get(2, &obj2)->isNum()) {
      error(-1, "Bad annotation destination position");
      kind = destFit;
    }
    left = obj2.getNum();
    obj2.free();

  // unknown link kind
  } else {
    error(-1, "Unknown annotation destination type");
    goto err2;
  }

  obj1.free();
  ok = gTrue;
  return;

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