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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/*
* Copyright 2017 Vincent Sanders <vince@netsurf-browser.org>
*
* This file is part of libnspsl
*
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
*/
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "nspdferror.h"
#include "cos_object.h"
#include "pdf_doc.h"
nspdferror cos_free_object(struct cos_object *cos_obj)
{
struct cos_dictionary_entry *dentry;
struct cos_array_entry *aentry;
switch (cos_obj->type) {
case COS_TYPE_NAME:
free(cos_obj->u.n);
break;
case COS_TYPE_STRING:
free(cos_obj->u.s->data);
free(cos_obj->u.s);
break;
case COS_TYPE_DICTIONARY:
dentry = cos_obj->u.dictionary;
while (dentry != NULL) {
struct cos_dictionary_entry *odentry;
cos_free_object(dentry->key);
cos_free_object(dentry->value);
odentry = dentry;
dentry = dentry->next;
free(odentry);
}
break;
case COS_TYPE_ARRAY:
aentry = cos_obj->u.array;
while (aentry != NULL) {
struct cos_array_entry *oaentry;
cos_free_object(aentry->value);
oaentry = aentry;
aentry = aentry->next;
free(oaentry);
}
break;
case COS_TYPE_STREAM:
free(cos_obj->u.stream);
break;
}
free(cos_obj);
return NSPDFERROR_OK;
}
/*
* extracts a value for a key in a dictionary.
*
* this finds and returns a value for a given key removing it from a dictionary
*/
nspdferror
cos_extract_dictionary_value(struct cos_object *dict,
const char *key,
struct cos_object **value_out)
{
struct cos_dictionary_entry *entry;
struct cos_dictionary_entry **prev;
if (dict->type != COS_TYPE_DICTIONARY) {
return NSPDFERROR_TYPE;
}
prev = &dict->u.dictionary;
entry = *prev;
while (entry != NULL) {
if (strcmp(entry->key->u.n, key) == 0) {
*value_out = entry->value;
*prev = entry->next;
cos_free_object(entry->key);
free(entry);
return NSPDFERROR_OK;
}
prev = &entry->next;
entry = *prev;
}
return NSPDFERROR_NOTFOUND;
}
/*
* get a value for a key from a dictionary
*/
nspdferror
cos_get_dictionary_value(struct pdf_doc *doc,
struct cos_object *dict,
const char *key,
struct cos_object **value_out)
{
nspdferror res;
struct cos_dictionary_entry *entry;
res = xref_get_referenced(doc, &dict);
if (res == NSPDFERROR_OK) {
if (dict->type != COS_TYPE_DICTIONARY) {
res = NSPDFERROR_TYPE;
} else {
res = NSPDFERROR_NOTFOUND;
entry = dict->u.dictionary;
while (entry != NULL) {
if (strcmp(entry->key->u.n, key) == 0) {
*value_out = entry->value;
res = NSPDFERROR_OK;
break;
}
entry = entry->next;
}
}
}
return res;
}
nspdferror
cos_get_dictionary_int(struct pdf_doc *doc,
struct cos_object *dict,
const char *key,
int64_t *value_out)
{
nspdferror res;
struct cos_object *dict_value;
res = cos_get_dictionary_value(doc, dict, key, &dict_value);
if (res != NSPDFERROR_OK) {
return res;
}
return cos_get_int(doc, dict_value, value_out);
}
nspdferror
cos_get_dictionary_name(struct pdf_doc *doc,
struct cos_object *dict,
const char *key,
const char **value_out)
{
nspdferror res;
struct cos_object *dict_value;
res = cos_get_dictionary_value(doc, dict, key, &dict_value);
if (res != NSPDFERROR_OK) {
return res;
}
return cos_get_name(doc, dict_value, value_out);
}
nspdferror
cos_get_dictionary_dictionary(struct pdf_doc *doc,
struct cos_object *dict,
const char *key,
struct cos_object **value_out)
{
nspdferror res;
struct cos_object *dict_value;
res = cos_get_dictionary_value(doc, dict, key, &dict_value);
if (res != NSPDFERROR_OK) {
return res;
}
return cos_get_dictionary(doc, dict_value, value_out);
}
nspdferror
cos_get_int(struct pdf_doc *doc,
struct cos_object *cobj,
int64_t *value_out)
{
nspdferror res;
res = xref_get_referenced(doc, &cobj);
if (res == NSPDFERROR_OK) {
if (cobj->type != COS_TYPE_INT) {
res = NSPDFERROR_TYPE;
} else {
*value_out = cobj->u.i;
}
}
return res;
}
nspdferror
cos_get_name(struct pdf_doc *doc,
struct cos_object *cobj,
const char **value_out)
{
nspdferror res;
res = xref_get_referenced(doc, &cobj);
if (res == NSPDFERROR_OK) {
if (cobj->type != COS_TYPE_NAME) {
res = NSPDFERROR_TYPE;
} else {
*value_out = cobj->u.n;
}
}
return res;
}
nspdferror
cos_get_dictionary(struct pdf_doc *doc,
struct cos_object *cobj,
struct cos_object **value_out)
{
nspdferror res;
res = xref_get_referenced(doc, &cobj);
if (res == NSPDFERROR_OK) {
if (cobj->type != COS_TYPE_DICTIONARY) {
res = NSPDFERROR_TYPE;
} else {
*value_out = cobj;
}
}
return res;
}
|
