forked from pdfcpu/pdfcpu
-
Notifications
You must be signed in to change notification settings - Fork 0
/
destination.go
169 lines (121 loc) · 4.17 KB
/
destination.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*
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 (
pdf "github.com/pdfcpu/pdfcpu/pkg/pdfcpu"
"github.com/pkg/errors"
)
func validateDestinationArrayFirstElement(xRefTable *pdf.XRefTable, a pdf.Array) (pdf.Object, error) {
o, err := xRefTable.Dereference(a[0])
if err != nil || o == nil {
return nil, err
}
switch o := o.(type) {
case pdf.Integer, pdf.Name: // no further processing
case pdf.Dict:
if o.Type() == nil || (*o.Type() != "Page" && *o.Type() != "Pages") {
err = errors.New("pdfcpu: validateDestinationArrayFirstElement: first element refers to invalid destination page dict" + *o.Type())
}
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 pdf.Array) bool {
l := len(a)
return l == 2 || l == 3 || l == 5 || l == 6 || l == 4 // 4 = hack! see below
}
func validateDestinationArray(xRefTable *pdf.XRefTable, a pdf.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].(pdf.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 == pdf.ValidationRelaxed {
nameErr = !pdf.MemberOf(name.Value(), []string{"Fit", "FitB", "FitH"})
} else {
nameErr = !pdf.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 *pdf.XRefTable, d pdf.Dict) error {
// D, required, array
a, err := validateArrayEntry(xRefTable, d, "DestinationDict", "D", REQUIRED, pdf.V10, nil)
if err != nil || a == nil {
return err
}
return validateDestinationArray(xRefTable, a)
}
func validateDestination(xRefTable *pdf.XRefTable, o pdf.Object) error {
o, err := xRefTable.Dereference(o)
if err != nil || o == nil {
return err
}
switch o := o.(type) {
case pdf.Name:
// no further processing.
case pdf.StringLiteral:
// no further processing.
case pdf.HexLiteral:
// no further processing.
case pdf.Dict:
err = validateDestinationDict(xRefTable, o)
case pdf.Array:
err = validateDestinationArray(xRefTable, o)
default:
err = errors.New("pdfcpu: validateDestination: unsupported PDF object")
}
return err
}
func validateDestinationEntry(xRefTable *pdf.XRefTable, d pdf.Dict, dictName string, entryName string, required bool, sinceVersion pdf.Version) error {
// see 12.3.2
o, err := validateEntry(xRefTable, d, dictName, entryName, required, sinceVersion)
if err != nil {
return err
}
return validateDestination(xRefTable, o)
}