forked from pdfcpu/pdfcpu
/
destination.go
187 lines (136 loc) · 4.68 KB
/
destination.go
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/*
Copyright 2018 The pdfcpu Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package validate
import (
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model"
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/types"
"github.com/pkg/errors"
)
func validateDestinationArrayFirstElement(xRefTable *model.XRefTable, a types.Array) (types.Object, error) {
o, err := xRefTable.Dereference(a[0])
if err != nil || o == nil {
return nil, err
}
if o == nil {
return nil, errors.Errorf("destination array invalid: %s", a)
}
switch o := o.(type) {
case types.Integer, types.Name: // no further processing
case types.Dict:
if o.Type() == nil || (o.Type() != nil && (*o.Type() != "Page" && *o.Type() != "Pages")) {
err = errors.Errorf("pdfcpu: validateDestinationArrayFirstElement: first element must be a pageDict indRef or an integer: %v (%T)", o, o)
}
default:
err = errors.Errorf("pdfcpu: validateDestinationArrayFirstElement: first element must be a pageDict indRef or an integer: %v (%T)", o, o)
}
return o, err
}
func validateDestinationArrayLength(a types.Array) bool {
l := len(a)
return l == 2 || l == 3 || l == 5 || l == 6 || l == 4 // 4 = hack! see below
}
func validateDestinationArray(xRefTable *model.XRefTable, a types.Array) error {
// Validate first element: indRef of page dict or pageNumber(int) of remote doc for remote Go-to Action or nil.
o, err := validateDestinationArrayFirstElement(xRefTable, a)
if err != nil || o == nil {
return err
}
if !validateDestinationArrayLength(a) {
return errors.Errorf("pdfcpu: validateDestinationArray: invalid length: %d", len(a))
}
// NOTE if len == 4 we possible have a missing first element, which should be an indRef to the dest page.
// TODO Investigate.
i := 1
// if len(a) == 4 {
// i = 0
// }
// Validate rest of array elements.
name, ok := a[i].(types.Name)
if !ok {
return errors.Errorf("pdfcpu: validateDestinationArray: second element must be a name %v (%d)", a[i], i)
}
var nameErr bool
switch len(a) {
case 2:
if xRefTable.ValidationMode == model.ValidationRelaxed {
nameErr = !types.MemberOf(name.Value(), []string{"Fit", "FitB", "FitH"})
} else {
nameErr = !types.MemberOf(name.Value(), []string{"Fit", "FitB"})
}
case 3:
nameErr = name.Value() != "FitH" && name.Value() != "FitV" && name.Value() != "FitBH"
case 4:
// TODO Cleanup
// hack for #381 - possibly zoom == null or 0
// eg. [(886 0 R) XYZ 53 303]
nameErr = name.Value() != "XYZ"
case 5:
nameErr = name.Value() != "XYZ"
case 6:
nameErr = name.Value() != "FitR"
default:
return errors.Errorf("validateDestinationArray: array length %d not allowed: %v", len(a), a)
}
if nameErr {
return errors.New("pdfcpu: validateDestinationArray: arr[1] corrupt")
}
return nil
}
func validateDestinationDict(xRefTable *model.XRefTable, d types.Dict) error {
// D, required, array
a, err := validateArrayEntry(xRefTable, d, "DestinationDict", "D", REQUIRED, model.V10, nil)
if err != nil || a == nil {
return err
}
return validateDestinationArray(xRefTable, a)
}
func validateDestination(xRefTable *model.XRefTable, o types.Object, forAction bool) (string, error) {
o, err := xRefTable.Dereference(o)
if err != nil || o == nil {
return "", err
}
switch o := o.(type) {
case types.Name:
return o.Value(), nil
case types.StringLiteral:
return types.StringLiteralToString(o)
case types.HexLiteral:
return types.HexLiteralToString(o)
case types.Dict:
if forAction {
return "", errors.New("pdfcpu: validateDestination: unsupported PDF object")
}
err = validateDestinationDict(xRefTable, o)
case types.Array:
err = validateDestinationArray(xRefTable, o)
default:
err = errors.New("pdfcpu: validateDestination: unsupported PDF object")
}
return "", err
}
func validateActionDestinationEntry(xRefTable *model.XRefTable, d types.Dict, dictName string, entryName string, required bool, sinceVersion model.Version) error {
// see 12.3.2
o, err := validateEntry(xRefTable, d, dictName, entryName, required, sinceVersion)
if err != nil {
return err
}
name, err := validateDestination(xRefTable, o, true)
if err != nil {
return err
}
if len(name) > 0 && xRefTable.IsMerging() {
nm := xRefTable.NameRef("Dests")
nm.Add(name, d)
}
return nil
}