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
|
// Copyright 2014 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/fxcrt/cfx_fileaccess_windows.h"
#include <memory>
#include "core/fxcrt/fx_string.h"
#include "third_party/base/ptr_util.h"
#if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
namespace {
void GetFileMode(uint32_t dwMode,
uint32_t& dwAccess,
uint32_t& dwShare,
uint32_t& dwCreation) {
dwAccess = GENERIC_READ;
dwShare = FILE_SHARE_READ | FILE_SHARE_WRITE;
if (!(dwMode & FX_FILEMODE_ReadOnly)) {
dwAccess |= GENERIC_WRITE;
dwCreation = (dwMode & FX_FILEMODE_Truncate) ? CREATE_ALWAYS : OPEN_ALWAYS;
} else {
dwCreation = OPEN_EXISTING;
}
}
} // namespace
// static
std::unique_ptr<IFX_FileAccess> IFX_FileAccess::Create() {
return pdfium::MakeUnique<CFX_FileAccess_Windows>();
}
#ifdef __cplusplus
extern "C" {
#endif
WINBASEAPI BOOL WINAPI GetFileSizeEx(HANDLE hFile, PLARGE_INTEGER lpFileSize);
WINBASEAPI BOOL WINAPI SetFilePointerEx(HANDLE hFile,
LARGE_INTEGER liDistanceToMove,
PLARGE_INTEGER lpNewFilePointer,
DWORD dwMoveMethod);
#ifdef __cplusplus
}
#endif
CFX_FileAccess_Windows::CFX_FileAccess_Windows() : m_hFile(nullptr) {}
CFX_FileAccess_Windows::~CFX_FileAccess_Windows() {
Close();
}
bool CFX_FileAccess_Windows::Open(const ByteStringView& fileName,
uint32_t dwMode) {
if (m_hFile)
return false;
uint32_t dwAccess, dwShare, dwCreation;
GetFileMode(dwMode, dwAccess, dwShare, dwCreation);
m_hFile = ::CreateFileA(fileName.unterminated_c_str(), dwAccess, dwShare,
nullptr, dwCreation, FILE_ATTRIBUTE_NORMAL, nullptr);
if (m_hFile == INVALID_HANDLE_VALUE)
m_hFile = nullptr;
return !!m_hFile;
}
bool CFX_FileAccess_Windows::Open(const WideStringView& fileName,
uint32_t dwMode) {
if (m_hFile)
return false;
uint32_t dwAccess, dwShare, dwCreation;
GetFileMode(dwMode, dwAccess, dwShare, dwCreation);
m_hFile =
::CreateFileW((LPCWSTR)fileName.unterminated_c_str(), dwAccess, dwShare,
nullptr, dwCreation, FILE_ATTRIBUTE_NORMAL, nullptr);
if (m_hFile == INVALID_HANDLE_VALUE)
m_hFile = nullptr;
return !!m_hFile;
}
void CFX_FileAccess_Windows::Close() {
if (!m_hFile)
return;
::CloseHandle(m_hFile);
m_hFile = nullptr;
}
FX_FILESIZE CFX_FileAccess_Windows::GetSize() const {
if (!m_hFile)
return 0;
LARGE_INTEGER size = {};
if (!::GetFileSizeEx(m_hFile, &size))
return 0;
return (FX_FILESIZE)size.QuadPart;
}
FX_FILESIZE CFX_FileAccess_Windows::GetPosition() const {
if (!m_hFile)
return (FX_FILESIZE)-1;
LARGE_INTEGER dist = {};
LARGE_INTEGER newPos = {};
if (!::SetFilePointerEx(m_hFile, dist, &newPos, FILE_CURRENT))
return (FX_FILESIZE)-1;
return (FX_FILESIZE)newPos.QuadPart;
}
FX_FILESIZE CFX_FileAccess_Windows::SetPosition(FX_FILESIZE pos) {
if (!m_hFile)
return (FX_FILESIZE)-1;
LARGE_INTEGER dist;
dist.QuadPart = pos;
LARGE_INTEGER newPos = {};
if (!::SetFilePointerEx(m_hFile, dist, &newPos, FILE_BEGIN))
return (FX_FILESIZE)-1;
return (FX_FILESIZE)newPos.QuadPart;
}
size_t CFX_FileAccess_Windows::Read(void* pBuffer, size_t szBuffer) {
if (!m_hFile)
return 0;
size_t szRead = 0;
if (!::ReadFile(m_hFile, pBuffer, (DWORD)szBuffer, (LPDWORD)&szRead,
nullptr)) {
return 0;
}
return szRead;
}
size_t CFX_FileAccess_Windows::Write(const void* pBuffer, size_t szBuffer) {
if (!m_hFile)
return 0;
size_t szWrite = 0;
if (!::WriteFile(m_hFile, pBuffer, (DWORD)szBuffer, (LPDWORD)&szWrite,
nullptr)) {
return 0;
}
return szWrite;
}
size_t CFX_FileAccess_Windows::ReadPos(void* pBuffer,
size_t szBuffer,
FX_FILESIZE pos) {
if (!m_hFile)
return 0;
if (pos >= GetSize())
return 0;
if (SetPosition(pos) == (FX_FILESIZE)-1)
return 0;
return Read(pBuffer, szBuffer);
}
size_t CFX_FileAccess_Windows::WritePos(const void* pBuffer,
size_t szBuffer,
FX_FILESIZE pos) {
if (!m_hFile) {
return 0;
}
if (SetPosition(pos) == (FX_FILESIZE)-1) {
return 0;
}
return Write(pBuffer, szBuffer);
}
bool CFX_FileAccess_Windows::Flush() {
if (!m_hFile)
return false;
return !!::FlushFileBuffers(m_hFile);
}
bool CFX_FileAccess_Windows::Truncate(FX_FILESIZE szFile) {
if (SetPosition(szFile) == (FX_FILESIZE)-1)
return false;
return !!::SetEndOfFile(m_hFile);
}
#endif
|
