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
|
// 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
#ifndef CORE_FXCRT_CFX_STRING_C_TEMPLATE_H_
#define CORE_FXCRT_CFX_STRING_C_TEMPLATE_H_
#include <algorithm>
#include <type_traits>
#include <utility>
#include <vector>
#include "core/fxcrt/cfx_unowned_ptr.h"
#include "core/fxcrt/fx_system.h"
#include "third_party/base/optional.h"
#include "third_party/base/stl_util.h"
// An immutable string with caller-provided storage which must outlive the
// string itself. These are not necessarily nul-terminated, so that substring
// extraction (via the Mid(), Left(), and Right() methods) is copy-free.
template <typename T>
class CFX_StringCTemplate {
public:
using CharType = T;
using UnsignedType = typename std::make_unsigned<CharType>::type;
using const_iterator = const CharType*;
CFX_StringCTemplate() : m_Ptr(nullptr), m_Length(0) {}
// Deliberately implicit to avoid calling on every string literal.
// NOLINTNEXTLINE(runtime/explicit)
CFX_StringCTemplate(const CharType* ptr)
: m_Ptr(reinterpret_cast<const UnsignedType*>(ptr)),
m_Length(ptr ? FXSYS_len(ptr) : 0) {}
CFX_StringCTemplate(const CharType* ptr, FX_STRSIZE len)
: m_Ptr(reinterpret_cast<const UnsignedType*>(ptr)),
m_Length(len < 0 ? FXSYS_len(ptr) : len) {}
template <typename U = UnsignedType>
CFX_StringCTemplate(
const UnsignedType* ptr,
FX_STRSIZE size,
typename std::enable_if<!std::is_same<U, CharType>::value>::type* = 0)
: m_Ptr(ptr), m_Length(size) {}
// Deliberately implicit to avoid calling on every string literal.
// |ch| must be an lvalue that outlives the the CFX_StringCTemplate.
// NOLINTNEXTLINE(runtime/explicit)
CFX_StringCTemplate(CharType& ch) {
m_Ptr = reinterpret_cast<const UnsignedType*>(&ch);
m_Length = 1;
}
CFX_StringCTemplate(const CFX_StringCTemplate& src) {
m_Ptr = src.m_Ptr;
m_Length = src.m_Length;
}
// Any changes to |vec| invalidate the string.
explicit CFX_StringCTemplate(const std::vector<UnsignedType>& vec) {
m_Length = pdfium::CollectionSize<FX_STRSIZE>(vec);
m_Ptr = m_Length ? vec.data() : nullptr;
}
CFX_StringCTemplate& operator=(const CharType* src) {
m_Ptr = reinterpret_cast<const UnsignedType*>(src);
m_Length = src ? FXSYS_len(src) : 0;
return *this;
}
CFX_StringCTemplate& operator=(const CFX_StringCTemplate& src) {
m_Ptr = src.m_Ptr;
m_Length = src.m_Length;
return *this;
}
const_iterator begin() const {
return reinterpret_cast<const CharType*>(m_Ptr.Get());
}
const_iterator end() const {
return m_Ptr ? reinterpret_cast<const CharType*>(m_Ptr.Get()) + m_Length
: nullptr;
}
bool operator==(const CharType* ptr) const {
return FXSYS_len(ptr) == m_Length &&
FXSYS_cmp(ptr, reinterpret_cast<const CharType*>(m_Ptr.Get()),
m_Length) == 0;
}
bool operator==(const CFX_StringCTemplate& other) const {
return other.m_Length == m_Length &&
FXSYS_cmp(reinterpret_cast<const CharType*>(other.m_Ptr.Get()),
reinterpret_cast<const CharType*>(m_Ptr.Get()),
m_Length) == 0;
}
bool operator!=(const CharType* ptr) const { return !(*this == ptr); }
bool operator!=(const CFX_StringCTemplate& other) const {
return !(*this == other);
}
uint32_t GetID() const {
if (m_Length == 0)
return 0;
uint32_t strid = 0;
FX_STRSIZE size = std::min(4, m_Length);
for (FX_STRSIZE i = 0; i < size; i++)
strid = strid * 256 + m_Ptr.Get()[i];
return strid << ((4 - size) * 8);
}
const UnsignedType* raw_str() const { return m_Ptr.Get(); }
const CharType* unterminated_c_str() const {
return reinterpret_cast<const CharType*>(m_Ptr.Get());
}
FX_STRSIZE GetLength() const { return m_Length; }
bool IsEmpty() const { return m_Length == 0; }
bool IsValidIndex(FX_STRSIZE index) const {
return 0 <= index && index < GetLength();
}
bool IsValidLength(FX_STRSIZE length) const {
return 0 <= length && length <= GetLength();
}
const UnsignedType& operator[](const FX_STRSIZE index) const {
ASSERT(IsValidIndex(index));
return m_Ptr.Get()[index];
}
const CharType CharAt(const FX_STRSIZE index) const {
ASSERT(IsValidIndex(index));
return static_cast<CharType>(m_Ptr.Get()[index]);
}
pdfium::Optional<FX_STRSIZE> Find(CharType ch) const {
const UnsignedType* found = reinterpret_cast<const UnsignedType*>(FXSYS_chr(
reinterpret_cast<const CharType*>(m_Ptr.Get()), ch, m_Length));
return found ? pdfium::Optional<FX_STRSIZE>(found - m_Ptr.Get())
: pdfium::Optional<FX_STRSIZE>();
}
bool Contains(CharType ch) const { return Find(ch).has_value(); }
CFX_StringCTemplate Mid(FX_STRSIZE first, FX_STRSIZE count) const {
if (!m_Ptr.Get())
return CFX_StringCTemplate();
if (!IsValidIndex(first))
return CFX_StringCTemplate();
if (count == 0 || !IsValidLength(count))
return CFX_StringCTemplate();
if (!IsValidIndex(first + count - 1))
return CFX_StringCTemplate();
return CFX_StringCTemplate(m_Ptr.Get() + first, count);
}
CFX_StringCTemplate Left(FX_STRSIZE count) const {
if (count == 0 || !IsValidLength(count))
return CFX_StringCTemplate();
return Mid(0, count);
}
CFX_StringCTemplate Right(FX_STRSIZE count) const {
if (count == 0 || !IsValidLength(count))
return CFX_StringCTemplate();
return Mid(GetLength() - count, count);
}
bool operator<(const CFX_StringCTemplate& that) const {
int result = FXSYS_cmp(reinterpret_cast<const CharType*>(m_Ptr.Get()),
reinterpret_cast<const CharType*>(that.m_Ptr.Get()),
std::min(m_Length, that.m_Length));
return result < 0 || (result == 0 && m_Length < that.m_Length);
}
bool operator>(const CFX_StringCTemplate& that) const {
int result = FXSYS_cmp(reinterpret_cast<const CharType*>(m_Ptr.Get()),
reinterpret_cast<const CharType*>(that.m_Ptr.Get()),
std::min(m_Length, that.m_Length));
return result > 0 || (result == 0 && m_Length > that.m_Length);
}
protected:
CFX_UnownedPtr<const UnsignedType> m_Ptr;
FX_STRSIZE m_Length;
private:
void* operator new(size_t) throw() { return nullptr; }
};
template <typename T>
inline bool operator==(const T* lhs, const CFX_StringCTemplate<T>& rhs) {
return rhs == lhs;
}
template <typename T>
inline bool operator!=(const T* lhs, const CFX_StringCTemplate<T>& rhs) {
return rhs != lhs;
}
extern template class CFX_StringCTemplate<char>;
extern template class CFX_StringCTemplate<wchar_t>;
using CFX_ByteStringC = CFX_StringCTemplate<char>;
using CFX_WideStringC = CFX_StringCTemplate<wchar_t>;
#endif // CORE_FXCRT_CFX_STRING_C_TEMPLATE_H_
|
