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
|
// Copyright 2017 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 <limits>
#include <vector>
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_string.h"
namespace {
class CFX_UTF8Encoder {
public:
CFX_UTF8Encoder() {}
~CFX_UTF8Encoder() {}
void Input(wchar_t unicodeAsWchar) {
uint32_t unicode = static_cast<uint32_t>(unicodeAsWchar);
if (unicode < 0x80) {
m_Buffer.push_back(unicode);
} else {
if (unicode >= 0x80000000)
return;
int nbytes = 0;
if (unicode < 0x800)
nbytes = 2;
else if (unicode < 0x10000)
nbytes = 3;
else if (unicode < 0x200000)
nbytes = 4;
else if (unicode < 0x4000000)
nbytes = 5;
else
nbytes = 6;
static uint8_t prefix[] = {0xc0, 0xe0, 0xf0, 0xf8, 0xfc};
int order = 1 << ((nbytes - 1) * 6);
int code = unicodeAsWchar;
m_Buffer.push_back(prefix[nbytes - 2] | (code / order));
for (int i = 0; i < nbytes - 1; i++) {
code = code % order;
order >>= 6;
m_Buffer.push_back(0x80 | (code / order));
}
}
}
// The data returned by GetResult() is invalidated when this is modified by
// appending any data.
CFX_ByteStringC GetResult() const {
return CFX_ByteStringC(m_Buffer.data(), m_Buffer.size());
}
private:
std::vector<uint8_t> m_Buffer;
};
} // namespace
CFX_ByteString FX_UTF8Encode(const CFX_WideStringC& wsStr) {
FX_STRSIZE len = wsStr.GetLength();
const wchar_t* pStr = wsStr.unterminated_c_str();
CFX_UTF8Encoder encoder;
while (len-- > 0)
encoder.Input(*pStr++);
return CFX_ByteString(encoder.GetResult());
}
namespace {
const float fraction_scales[] = {0.1f, 0.01f, 0.001f,
0.0001f, 0.00001f, 0.000001f,
0.0000001f, 0.00000001f, 0.000000001f,
0.0000000001f, 0.00000000001f};
float FractionalScale(size_t scale_factor, int value) {
return fraction_scales[scale_factor] * value;
}
} // namespace
bool FX_atonum(const CFX_ByteStringC& strc, void* pData) {
if (strc.Contains('.')) {
float* pFloat = static_cast<float*>(pData);
*pFloat = FX_atof(strc);
return false;
}
// Note, numbers in PDF are typically of the form 123, -123, etc. But,
// for things like the Permissions on the encryption hash the number is
// actually an unsigned value. We use a uint32_t so we can deal with the
// unsigned and then check for overflow if the user actually signed the value.
// The Permissions flag is listed in Table 3.20 PDF 1.7 spec.
pdfium::base::CheckedNumeric<uint32_t> integer = 0;
bool bNegative = false;
bool bSigned = false;
FX_STRSIZE cc = 0;
if (strc[0] == '+') {
cc++;
bSigned = true;
} else if (strc[0] == '-') {
bNegative = true;
bSigned = true;
cc++;
}
while (cc < strc.GetLength() && std::isdigit(strc[cc])) {
integer = integer * 10 + FXSYS_DecimalCharToInt(strc.CharAt(cc));
if (!integer.IsValid())
break;
cc++;
}
// We have a sign, and the value was greater then a regular integer
// we've overflowed, reset to the default value.
if (bSigned) {
if (bNegative) {
if (integer.ValueOrDefault(0) >
static_cast<uint32_t>(std::numeric_limits<int>::max()) + 1) {
integer = 0;
}
} else if (integer.ValueOrDefault(0) >
static_cast<uint32_t>(std::numeric_limits<int>::max())) {
integer = 0;
}
}
// Switch back to the int space so we can flip to a negative if we need.
uint32_t uValue = integer.ValueOrDefault(0);
int32_t value = static_cast<int>(uValue);
if (bNegative)
value = -value;
int* pInt = static_cast<int*>(pData);
*pInt = value;
return true;
}
float FX_atof(const CFX_ByteStringC& strc) {
if (strc.IsEmpty())
return 0.0;
int cc = 0;
bool bNegative = false;
int len = strc.GetLength();
if (strc[0] == '+') {
cc++;
} else if (strc[0] == '-') {
bNegative = true;
cc++;
}
while (cc < len) {
if (strc[cc] != '+' && strc[cc] != '-')
break;
cc++;
}
float value = 0;
while (cc < len) {
if (strc[cc] == '.')
break;
value = value * 10 + FXSYS_DecimalCharToInt(strc.CharAt(cc));
cc++;
}
int scale = 0;
if (cc < len && strc[cc] == '.') {
cc++;
while (cc < len) {
value += FractionalScale(scale, FXSYS_DecimalCharToInt(strc.CharAt(cc)));
scale++;
if (scale == FX_ArraySize(fraction_scales))
break;
cc++;
}
}
return bNegative ? -value : value;
}
float FX_atof(const CFX_WideStringC& wsStr) {
return FX_atof(FX_UTF8Encode(wsStr).c_str());
}
FX_STRSIZE FX_ftoa(float d, char* buf) {
buf[0] = '0';
buf[1] = '\0';
if (d == 0.0f) {
return 1;
}
bool bNegative = false;
if (d < 0) {
bNegative = true;
d = -d;
}
int scale = 1;
int scaled = FXSYS_round(d);
while (scaled < 100000) {
if (scale == 1000000) {
break;
}
scale *= 10;
scaled = FXSYS_round(d * scale);
}
if (scaled == 0) {
return 1;
}
char buf2[32];
FX_STRSIZE buf_size = 0;
if (bNegative) {
buf[buf_size++] = '-';
}
int i = scaled / scale;
FXSYS_itoa(i, buf2, 10);
FX_STRSIZE len = FXSYS_strlen(buf2);
memcpy(buf + buf_size, buf2, len);
buf_size += len;
int fraction = scaled % scale;
if (fraction == 0) {
return buf_size;
}
buf[buf_size++] = '.';
scale /= 10;
while (fraction) {
buf[buf_size++] = '0' + fraction / scale;
fraction %= scale;
scale /= 10;
}
return buf_size;
}
|
