132
|
1 /*******************************************************************************
|
|
2
|
|
3 copyright: Copyright (c) 2004 Kris Bell. All rights reserved
|
|
4
|
|
5 license: BSD style: $(LICENSE)
|
|
6
|
|
7 version: Initial release: May 2005
|
|
8
|
|
9 author: Kris
|
|
10
|
|
11 *******************************************************************************/
|
|
12
|
|
13 module tango.io.DeviceConduit;
|
|
14
|
|
15 private import tango.sys.Common;
|
|
16
|
|
17 public import tango.io.Conduit;
|
|
18
|
|
19 private import tango.core.Exception;
|
|
20
|
|
21 /*******************************************************************************
|
|
22
|
|
23 Implements a means of reading and writing a file device. Conduits
|
|
24 are the primary means of accessing external data, and are usually
|
|
25 routed through a Buffer.
|
|
26
|
|
27 *******************************************************************************/
|
|
28
|
|
29 class DeviceConduit : Conduit
|
|
30 {
|
|
31 /// expose in superclass definition also
|
|
32 public alias Conduit.error error;
|
|
33
|
|
34 /***********************************************************************
|
|
35
|
|
36 Throw an IOException noting the last error
|
|
37
|
|
38 ***********************************************************************/
|
|
39
|
|
40 final void error ()
|
|
41 {
|
|
42 super.error (toString() ~ " :: " ~ SysError.lastMsg);
|
|
43 }
|
|
44
|
|
45 /***********************************************************************
|
|
46
|
|
47 Return the name of this device
|
|
48
|
|
49 ***********************************************************************/
|
|
50
|
|
51 override char[] toString()
|
|
52 {
|
|
53 return "<device>";
|
|
54 }
|
|
55
|
|
56 /***********************************************************************
|
|
57
|
|
58 Return a preferred size for buffering conduit I/O
|
|
59
|
|
60 ***********************************************************************/
|
|
61
|
|
62 override uint bufferSize ()
|
|
63 {
|
|
64 return 1024 * 16;
|
|
65 }
|
|
66
|
|
67 /***********************************************************************
|
|
68
|
|
69 Windows-specific code
|
|
70
|
|
71 ***********************************************************************/
|
|
72
|
|
73 version (Win32)
|
|
74 {
|
|
75 protected HANDLE handle;
|
|
76
|
|
77 /***************************************************************
|
|
78
|
|
79 Gain access to the standard IO handles (console etc).
|
|
80
|
|
81 ***************************************************************/
|
|
82
|
|
83 protected void reopen (Handle handle)
|
|
84 {
|
|
85 this.handle = cast(HANDLE) handle;
|
|
86 }
|
|
87
|
|
88 /***************************************************************
|
|
89
|
|
90 Return the underlying OS handle of this Conduit
|
|
91
|
|
92 ***************************************************************/
|
|
93
|
|
94 final override Handle fileHandle ()
|
|
95 {
|
|
96 return cast(Handle) handle;
|
|
97 }
|
|
98
|
|
99 /***************************************************************
|
|
100
|
|
101 Release the underlying file
|
|
102
|
|
103 ***************************************************************/
|
|
104
|
|
105 override void detach ()
|
|
106 {
|
|
107 if (handle)
|
|
108 if (! CloseHandle (handle))
|
|
109 error ();
|
|
110 handle = cast(HANDLE) null;
|
|
111 }
|
|
112
|
|
113 /***************************************************************
|
|
114
|
|
115 Read a chunk of bytes from the file into the provided
|
|
116 array (typically that belonging to an IBuffer).
|
|
117
|
|
118 Returns the number of bytes read, or Eof when there is
|
|
119 no further data
|
|
120
|
|
121 ***************************************************************/
|
|
122
|
|
123 override uint read (void[] dst)
|
|
124 {
|
|
125 DWORD read;
|
|
126 void *p = dst.ptr;
|
|
127
|
|
128 if (! ReadFile (handle, p, dst.length, &read, null))
|
|
129 // make Win32 behave like linux
|
|
130 if (SysError.lastCode is ERROR_BROKEN_PIPE)
|
|
131 return Eof;
|
|
132 else
|
|
133 error ();
|
|
134
|
|
135 if (read is 0 && dst.length > 0)
|
|
136 return Eof;
|
|
137 return read;
|
|
138 }
|
|
139
|
|
140 /***************************************************************
|
|
141
|
|
142 Write a chunk of bytes to the file from the provided
|
|
143 array (typically that belonging to an IBuffer)
|
|
144
|
|
145 ***************************************************************/
|
|
146
|
|
147 override uint write (void[] src)
|
|
148 {
|
|
149 DWORD written;
|
|
150
|
|
151 if (! WriteFile (handle, src.ptr, src.length, &written, null))
|
|
152 error ();
|
|
153
|
|
154 return written;
|
|
155 }
|
|
156 }
|
|
157
|
|
158
|
|
159 /***********************************************************************
|
|
160
|
|
161 Unix-specific code.
|
|
162
|
|
163 ***********************************************************************/
|
|
164
|
|
165 version (Posix)
|
|
166 {
|
|
167 protected int handle = -1;
|
|
168
|
|
169 /***************************************************************
|
|
170
|
|
171 Gain access to the standard IO handles (console etc).
|
|
172
|
|
173 ***************************************************************/
|
|
174
|
|
175 protected void reopen (Handle handle)
|
|
176 {
|
|
177 this.handle = handle;
|
|
178 }
|
|
179
|
|
180 /***************************************************************
|
|
181
|
|
182 Return the underlying OS handle of this Conduit
|
|
183
|
|
184 ***************************************************************/
|
|
185
|
|
186 final override Handle fileHandle ()
|
|
187 {
|
|
188 return cast(Handle) handle;
|
|
189 }
|
|
190
|
|
191 /***************************************************************
|
|
192
|
|
193 Release the underlying file
|
|
194
|
|
195 ***************************************************************/
|
|
196
|
|
197 override void detach ()
|
|
198 {
|
|
199 if (handle >= 0)
|
|
200 if (posix.close (handle) is -1)
|
|
201 error ();
|
|
202 handle = -1;
|
|
203 }
|
|
204
|
|
205 /***************************************************************
|
|
206
|
|
207 Read a chunk of bytes from the file into the provided
|
|
208 array (typically that belonging to an IBuffer)
|
|
209
|
|
210 ***************************************************************/
|
|
211
|
|
212 override uint read (void[] dst)
|
|
213 {
|
|
214 int read = posix.read (handle, dst.ptr, dst.length);
|
|
215 if (read == -1)
|
|
216 error ();
|
|
217 else
|
|
218 if (read is 0 && dst.length > 0)
|
|
219 return Eof;
|
|
220 return read;
|
|
221 }
|
|
222
|
|
223 /***************************************************************
|
|
224
|
|
225 Write a chunk of bytes to the file from the provided
|
|
226 array (typically that belonging to an IBuffer)
|
|
227
|
|
228 ***************************************************************/
|
|
229
|
|
230 override uint write (void[] src)
|
|
231 {
|
|
232 int written = posix.write (handle, src.ptr, src.length);
|
|
233 if (written is -1)
|
|
234 error ();
|
|
235 return written;
|
|
236 }
|
|
237 }
|
|
238 }
|
|
239
|
|
240
|