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
|
// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "public/fpdf_structtree.h"
#include <memory>
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfdoc/cpdf_structelement.h"
#include "core/fpdfdoc/cpdf_structtree.h"
#include "fpdfsdk/fsdk_define.h"
namespace {
CPDF_StructTree* ToStructTree(FPDF_STRUCTTREE struct_tree) {
return static_cast<CPDF_StructTree*>(struct_tree);
}
CPDF_StructElement* ToStructTreeElement(FPDF_STRUCTELEMENT struct_element) {
return static_cast<CPDF_StructElement*>(struct_element);
}
unsigned long WideStringToBuffer(const WideString& str,
void* buffer,
unsigned long buflen) {
if (str.IsEmpty())
return 0;
ByteString encodedStr = str.UTF16LE_Encode();
const unsigned long len = encodedStr.GetLength();
if (buffer && len <= buflen)
memcpy(buffer, encodedStr.c_str(), len);
return len;
}
} // namespace
FPDF_EXPORT FPDF_STRUCTTREE FPDF_CALLCONV
FPDF_StructTree_GetForPage(FPDF_PAGE page) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return nullptr;
return CPDF_StructTree::LoadPage(pPage->m_pDocument.Get(),
pPage->m_pFormDict.Get())
.release();
}
FPDF_EXPORT void FPDF_CALLCONV
FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) {
std::unique_ptr<CPDF_StructTree>(ToStructTree(struct_tree));
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree) {
CPDF_StructTree* tree = ToStructTree(struct_tree);
return tree ? tree->CountTopElements() : -1;
}
FPDF_EXPORT FPDF_STRUCTELEMENT FPDF_CALLCONV
FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index) {
CPDF_StructTree* tree = ToStructTree(struct_tree);
if (!tree || index < 0 || index >= tree->CountTopElements())
return nullptr;
return tree->GetTopElement(index);
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_StructElement_GetAltText(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen) {
CPDF_StructElement* elem = ToStructTreeElement(struct_element);
return (elem && elem->GetDict())
? WideStringToBuffer(elem->GetDict()->GetUnicodeTextFor("Alt"),
buffer, buflen)
: 0;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_StructElement_GetType(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen) {
CPDF_StructElement* elem = ToStructTreeElement(struct_element);
return elem ? WideStringToBuffer(elem->GetType().UTF8Decode(), buffer, buflen)
: 0;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_StructElement_GetTitle(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen) {
CPDF_StructElement* elem = ToStructTreeElement(struct_element);
return elem
? WideStringToBuffer(elem->GetTitle().UTF8Decode(), buffer, buflen)
: 0;
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_StructElement_CountChildren(FPDF_STRUCTELEMENT struct_element) {
CPDF_StructElement* elem = ToStructTreeElement(struct_element);
if (!elem)
return -1;
pdfium::base::CheckedNumeric<int> tmp_size = elem->CountKids();
return tmp_size.ValueOrDefault(-1);
}
FPDF_EXPORT FPDF_STRUCTELEMENT FPDF_CALLCONV
FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element,
int index) {
CPDF_StructElement* elem = ToStructTreeElement(struct_element);
if (!elem || index < 0 || static_cast<size_t>(index) >= elem->CountKids())
return nullptr;
return elem->GetKidIfElement(static_cast<size_t>(index));
}
|
