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
|
/*
* 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 <stdio.h>
#include "nspdferror.h"
#include "byte_class.h"
#include "cos_object.h"
#include "pdf_doc.h"
/**
* move offset to next non whitespace byte
*/
nspdferror doc_skip_ws(struct pdf_doc *doc, uint64_t *offset)
{
uint8_t c;
/* TODO sort out keeping offset in range */
c = DOC_BYTE(doc, *offset);
while ((bclass[c] & (BC_WSPC | BC_CMNT) ) != 0) {
(*offset)++;
/* skip comments */
if ((bclass[c] & BC_CMNT) != 0) {
c = DOC_BYTE(doc, *offset);
while ((bclass[c] & BC_EOLM ) == 0) {
(*offset)++;
c = DOC_BYTE(doc, *offset);
}
}
c = DOC_BYTE(doc, *offset);
}
return NSPDFERROR_OK;
}
/**
* move offset to next non eol byte
*/
nspdferror doc_skip_eol(struct pdf_doc *doc, uint64_t *offset)
{
uint8_t c;
/* TODO sort out keeping offset in range */
c = DOC_BYTE(doc, *offset);
while ((bclass[c] & BC_EOLM) != 0) {
(*offset)++;
c = DOC_BYTE(doc, *offset);
}
return NSPDFERROR_OK;
}
static struct cos_object cos_null_obj = {
.type = COS_TYPE_NULL,
};
nspdferror
xref_get_referenced(struct pdf_doc *doc, struct cos_object **cobj_out)
{
nspdferror res;
struct cos_object *cobj;
struct cos_object *indirect;
uint64_t offset;
struct xref_table_entry *entry;
cobj = *cobj_out;
if (cobj->type != COS_TYPE_REFERENCE) {
/* not passed a reference object so just return what was passed */
return NSPDFERROR_OK;
}
entry = doc->xref_table + cobj->u.reference->id;
/* check if referenced object is in range and exists. return null object if
* not
*/
if ((cobj->u.reference->id >= doc->xref_size) ||
(cobj->u.reference->id == 0) ||
(entry->ref.id == 0)) {
*cobj_out = &cos_null_obj;
return NSPDFERROR_OK;
}
if (entry->object == NULL) {
/* indirect object has never been decoded */
offset = entry->offset;
res = cos_decode_object(doc, &offset, &indirect);
if (res != NSPDFERROR_OK) {
printf("failed to decode indirect object\n");
return res;
}
entry->object = indirect;
}
*cobj_out = entry->object;
return NSPDFERROR_OK;
}
|
