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
|
// 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.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfdoc/cpdf_pagelabel.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fpdfdoc/cpdf_numbertree.h"
namespace {
WideString MakeRoman(int num) {
const int kArabic[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
const WideString kRoman[] = {L"m", L"cm", L"d", L"cd", L"c", L"xc", L"l",
L"xl", L"x", L"ix", L"v", L"iv", L"i"};
const int kMaxNum = 1000000;
num %= kMaxNum;
int i = 0;
WideString wsRomanNumber;
while (num > 0) {
while (num >= kArabic[i]) {
num = num - kArabic[i];
wsRomanNumber += kRoman[i];
}
i = i + 1;
}
return wsRomanNumber;
}
WideString MakeLetters(int num) {
if (num == 0)
return WideString();
WideString wsLetters;
const int nMaxCount = 1000;
const int nLetterCount = 26;
--num;
int count = num / nLetterCount + 1;
count %= nMaxCount;
wchar_t ch = L'a' + num % nLetterCount;
for (int i = 0; i < count; i++)
wsLetters += ch;
return wsLetters;
}
WideString GetLabelNumPortion(int num, const ByteString& bsStyle) {
if (bsStyle.IsEmpty())
return L"";
if (bsStyle == "D")
return WideString::Format(L"%d", num);
if (bsStyle == "R") {
WideString wsNumPortion = MakeRoman(num);
wsNumPortion.MakeUpper();
return wsNumPortion;
}
if (bsStyle == "r")
return MakeRoman(num);
if (bsStyle == "A") {
WideString wsNumPortion = MakeLetters(num);
wsNumPortion.MakeUpper();
return wsNumPortion;
}
if (bsStyle == "a")
return MakeLetters(num);
return L"";
}
} // namespace
CPDF_PageLabel::CPDF_PageLabel(CPDF_Document* pDocument)
: m_pDocument(pDocument) {}
CPDF_PageLabel::~CPDF_PageLabel() {}
Optional<WideString> CPDF_PageLabel::GetLabel(int nPage) const {
if (!m_pDocument)
return {};
if (nPage < 0 || nPage >= m_pDocument->GetPageCount())
return {};
const CPDF_Dictionary* pPDFRoot = m_pDocument->GetRoot();
if (!pPDFRoot)
return {};
CPDF_Dictionary* pLabels = pPDFRoot->GetDictFor("PageLabels");
if (!pLabels)
return {};
CPDF_NumberTree numberTree(pLabels);
CPDF_Object* pValue = nullptr;
int n = nPage;
while (n >= 0) {
pValue = numberTree.LookupValue(n);
if (pValue)
break;
n--;
}
WideString label;
if (pValue) {
pValue = pValue->GetDirect();
if (CPDF_Dictionary* pLabel = pValue->AsDictionary()) {
if (pLabel->KeyExist("P"))
label += pLabel->GetUnicodeTextFor("P");
ByteString bsNumberingStyle = pLabel->GetStringFor("S", "");
int nLabelNum = nPage - n + pLabel->GetIntegerFor("St", 1);
WideString wsNumPortion = GetLabelNumPortion(nLabelNum, bsNumberingStyle);
label += wsNumPortion;
return {label};
}
}
label = WideString::Format(L"%d", nPage + 1);
return {label};
}
int32_t CPDF_PageLabel::GetPageByLabel(const ByteStringView& bsLabel) const {
if (!m_pDocument)
return -1;
const CPDF_Dictionary* pPDFRoot = m_pDocument->GetRoot();
if (!pPDFRoot)
return -1;
int nPages = m_pDocument->GetPageCount();
for (int i = 0; i < nPages; i++) {
Optional<WideString> str = GetLabel(i);
if (!str.has_value())
continue;
if (PDF_EncodeText(str.value()).Compare(bsLabel))
return i;
}
int nPage = FXSYS_atoi(ByteString(bsLabel).c_str()); // NUL terminate.
return nPage > 0 && nPage <= nPages ? nPage : -1;
}
int32_t CPDF_PageLabel::GetPageByLabel(const WideStringView& wsLabel) const {
// TODO(tsepez): check usage of c_str() below.
return GetPageByLabel(
PDF_EncodeText(wsLabel.unterminated_c_str()).AsStringView());
}
|
