QPDF_String.cc
3.35 KB
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
#include <qpdf/QPDF_String.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QTC.hh>
// DO NOT USE ctype -- it is locale dependent for some things, and
// it's not worth the risk of including it in case it may accidentally
// be used.
#include <string.h>
// See above about ctype.
static bool is_ascii_printable(char ch)
{
return ((ch >= 32) && (ch <= 126));
}
static bool is_iso_latin1_printable(char ch)
{
return (((ch >= 32) && (ch <= 126)) ||
(static_cast<unsigned char>(ch) >= 160));
}
QPDF_String::QPDF_String(std::string const& val) :
val(val)
{
}
QPDF_String::~QPDF_String()
{
}
QPDF_String*
QPDF_String::new_utf16(std::string const& utf8_val)
{
return new QPDF_String(QUtil::utf8_to_utf16(utf8_val));
}
std::string
QPDF_String::unparse()
{
return unparse(false);
}
JSON
QPDF_String::getJSON()
{
return JSON::makeString(getUTF8Val());
}
QPDFObject::object_type_e
QPDF_String::getTypeCode() const
{
return QPDFObject::ot_string;
}
char const*
QPDF_String::getTypeName() const
{
return "string";
}
std::string
QPDF_String::unparse(bool force_binary)
{
bool use_hexstring = force_binary;
if (! use_hexstring)
{
unsigned int nonprintable = 0;
int consecutive_printable = 0;
for (unsigned int i = 0; i < this->val.length(); ++i)
{
char ch = this->val.at(i);
// Note: do not use locale to determine printability. The
// PDF specification accepts arbitrary binary data. Some
// locales imply multibyte characters. We'll consider
// something printable if it is printable in 7-bit ASCII.
// We'll code this manually rather than being rude and
// setting locale.
if ((ch == 0) || (! (is_ascii_printable(ch) ||
strchr("\n\r\t\b\f", ch))))
{
++nonprintable;
consecutive_printable = 0;
}
else
{
if (++consecutive_printable > 5)
{
// If there are more than 5 consecutive printable
// characters, I want to see them as such.
nonprintable = 0;
break;
}
}
}
// Use hex notation if more than 20% of the characters are not
// printable in plain ASCII.
if (5 * nonprintable > val.length())
{
use_hexstring = true;
}
}
std::string result;
if (use_hexstring)
{
result += "<" + QUtil::hex_encode(this->val) + ">";
}
else
{
result += "(";
for (unsigned int i = 0; i < this->val.length(); ++i)
{
char ch = this->val.at(i);
switch (ch)
{
case '\n':
result += "\\n";
break;
case '\r':
result += "\\r";
break;
case '\t':
result += "\\t";
break;
case '\b':
result += "\\b";
break;
case '\f':
result += "\\f";
break;
case '(':
result += "\\(";
break;
case ')':
result += "\\)";
break;
case '\\':
result += "\\\\";
break;
default:
if (is_iso_latin1_printable(ch))
{
result += this->val.at(i);
}
else
{
result += "\\" + QUtil::int_to_string_base(
static_cast<int>(static_cast<unsigned char>(ch)),
8, 3);
}
break;
}
}
result += ")";
}
return result;
}
std::string
QPDF_String::getVal() const
{
return this->val;
}
std::string
QPDF_String::getUTF8Val() const
{
if (QUtil::is_utf16(this->val))
{
return QUtil::utf16_to_utf8(this->val);
}
else
{
return QUtil::pdf_doc_to_utf8(this->val);
}
}