winpipes.cpp
4.51 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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
// winpipes.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "winpipes.h"
#ifdef WINDOWS_PIPES_AVAILABLE
#include "wait.h"
NAMESPACE_BEGIN(CryptoPP)
WindowsHandle::WindowsHandle(HANDLE h, bool own)
: m_h(h), m_own(own)
{
}
WindowsHandle::~WindowsHandle()
{
if (m_own)
{
try
{
CloseHandle();
}
catch (...)
{
}
}
}
bool WindowsHandle::HandleValid() const
{
return m_h && m_h != INVALID_HANDLE_VALUE;
}
void WindowsHandle::AttachHandle(HANDLE h, bool own)
{
if (m_own)
CloseHandle();
m_h = h;
m_own = own;
HandleChanged();
}
HANDLE WindowsHandle::DetachHandle()
{
HANDLE h = m_h;
m_h = INVALID_HANDLE_VALUE;
HandleChanged();
return h;
}
void WindowsHandle::CloseHandle()
{
if (m_h != INVALID_HANDLE_VALUE)
{
::CloseHandle(m_h);
m_h = INVALID_HANDLE_VALUE;
HandleChanged();
}
}
// ********************************************************
void WindowsPipe::HandleError(const char *operation) const
{
DWORD err = GetLastError();
throw Err(GetHandle(), operation, err);
}
WindowsPipe::Err::Err(HANDLE s, const std::string& operation, int error)
: OS_Error(IO_ERROR, "WindowsPipe: " + operation + " operation failed with error 0x" + IntToString(error, 16), operation, error)
, m_h(s)
{
}
// *************************************************************
WindowsPipeReceiver::WindowsPipeReceiver()
: m_resultPending(false), m_eofReceived(false)
{
m_event.AttachHandle(CreateEvent(NULL, true, false, NULL), true);
CheckAndHandleError("CreateEvent", m_event.HandleValid());
memset(&m_overlapped, 0, sizeof(m_overlapped));
m_overlapped.hEvent = m_event;
}
bool WindowsPipeReceiver::Receive(byte* buf, size_t bufLen)
{
assert(!m_resultPending && !m_eofReceived);
HANDLE h = GetHandle();
// don't queue too much at once, or we might use up non-paged memory
if (ReadFile(h, buf, UnsignedMin((DWORD)128*1024, bufLen), &m_lastResult, &m_overlapped))
{
if (m_lastResult == 0)
m_eofReceived = true;
}
else
{
switch (GetLastError())
{
default:
CheckAndHandleError("ReadFile", false);
case ERROR_BROKEN_PIPE:
case ERROR_HANDLE_EOF:
m_lastResult = 0;
m_eofReceived = true;
break;
case ERROR_IO_PENDING:
m_resultPending = true;
}
}
return !m_resultPending;
}
void WindowsPipeReceiver::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
if (m_resultPending)
container.AddHandle(m_event, CallStack("WindowsPipeReceiver::GetWaitObjects() - result pending", &callStack));
else if (!m_eofReceived)
container.SetNoWait(CallStack("WindowsPipeReceiver::GetWaitObjects() - result ready", &callStack));
}
unsigned int WindowsPipeReceiver::GetReceiveResult()
{
if (m_resultPending)
{
HANDLE h = GetHandle();
if (GetOverlappedResult(h, &m_overlapped, &m_lastResult, false))
{
if (m_lastResult == 0)
m_eofReceived = true;
}
else
{
switch (GetLastError())
{
default:
CheckAndHandleError("GetOverlappedResult", false);
case ERROR_BROKEN_PIPE:
case ERROR_HANDLE_EOF:
m_lastResult = 0;
m_eofReceived = true;
}
}
m_resultPending = false;
}
return m_lastResult;
}
// *************************************************************
WindowsPipeSender::WindowsPipeSender()
: m_resultPending(false), m_lastResult(0)
{
m_event.AttachHandle(CreateEvent(NULL, true, false, NULL), true);
CheckAndHandleError("CreateEvent", m_event.HandleValid());
memset(&m_overlapped, 0, sizeof(m_overlapped));
m_overlapped.hEvent = m_event;
}
void WindowsPipeSender::Send(const byte* buf, size_t bufLen)
{
DWORD written = 0;
HANDLE h = GetHandle();
// don't queue too much at once, or we might use up non-paged memory
if (WriteFile(h, buf, UnsignedMin((DWORD)128*1024, bufLen), &written, &m_overlapped))
{
m_resultPending = false;
m_lastResult = written;
}
else
{
if (GetLastError() != ERROR_IO_PENDING)
CheckAndHandleError("WriteFile", false);
m_resultPending = true;
}
}
void WindowsPipeSender::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
if (m_resultPending)
container.AddHandle(m_event, CallStack("WindowsPipeSender::GetWaitObjects() - result pending", &callStack));
else
container.SetNoWait(CallStack("WindowsPipeSender::GetWaitObjects() - result ready", &callStack));
}
unsigned int WindowsPipeSender::GetSendResult()
{
if (m_resultPending)
{
HANDLE h = GetHandle();
BOOL result = GetOverlappedResult(h, &m_overlapped, &m_lastResult, false);
CheckAndHandleError("GetOverlappedResult", result);
m_resultPending = false;
}
return m_lastResult;
}
NAMESPACE_END
#endif