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
|
/*****************************************************************
|
| Platinum - Stream Pump
|
| Copyright (c) 2004-2010, Plutinosoft, LLC.
| All rights reserved.
| http://www.plutinosoft.com
|
| This program is free software; you can redistribute it and/or
| modify it under the terms of the GNU General Public License
| as published by the Free Software Foundation; either version 2
| of the License, or (at your option) any later version.
|
| OEMs, ISVs, VARs and other distributors that combine and
| distribute commercially licensed software with Platinum software
| and do not wish to distribute the source code for the commercially
| licensed software under version 2, or (at your option) any later
| version, of the GNU General Public License (the "GPL") must enter
| into a commercial license agreement with Plutinosoft, LLC.
| licensing@plutinosoft.com
|
| This program is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with this program; see the file LICENSE.txt. If not, write to
| the Free Software Foundation, Inc.,
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
| http://www.gnu.org/licenses/gpl-2.0.html
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "PltStreamPump.h"
#include "NptUtils.h"
/*----------------------------------------------------------------------
| PLT_StreamPump::PLT_StreamPump
+---------------------------------------------------------------------*/
PLT_StreamPump::PLT_StreamPump(NPT_Size size) :
m_TotalBytesRead(0),
m_TotalBytesWritten(0)
{
m_RingBuffer = new NPT_RingBuffer(size);
}
/*----------------------------------------------------------------------
| PLT_StreamPump::~PLT_StreamPump
+---------------------------------------------------------------------*/
PLT_StreamPump::~PLT_StreamPump()
{
delete m_RingBuffer;
}
/*----------------------------------------------------------------------+
| PLT_StreamPump::PushData
+----------------------------------------------------------------------*/
NPT_Result
PLT_StreamPump::PushData(NPT_OutputStream& output,
NPT_Size& bytes_written)
{
NPT_Result res = NPT_ERROR_WOULD_BLOCK;
NPT_Size count = 0;
NPT_Size bytes_available = m_RingBuffer->GetContiguousAvailable();
bytes_written = 0;
if (bytes_available) {
res = output.Write(m_RingBuffer->GetReadPointer(), bytes_available, &count);
m_RingBuffer->MoveOut(count);
bytes_written += count;
// check if we wrapped around
bytes_available = m_RingBuffer->GetContiguousAvailable();
if (NPT_SUCCEEDED(res) && bytes_available) {
res = output.Write(m_RingBuffer->GetReadPointer(), bytes_available, &count);
m_RingBuffer->MoveOut(count);
bytes_written += count;
}
}
m_TotalBytesWritten += bytes_written;
return res;
}
/*----------------------------------------------------------------------+
| PLT_StreamPump::PullData
+----------------------------------------------------------------------*/
NPT_Result
PLT_StreamPump::PullData(NPT_InputStream& input,
NPT_Size max_bytes_to_read)
{
NPT_Result res = NPT_ERROR_WOULD_BLOCK;
NPT_Size byte_space = m_RingBuffer->GetContiguousSpace();
// check that there is space left
// make sure we don't read more than our contiguous space
NPT_Size nb_to_read = (max_bytes_to_read<byte_space)?max_bytes_to_read:byte_space;
if (nb_to_read > 0) {
NPT_Size count;
res = input.Read(m_RingBuffer->GetWritePointer(), nb_to_read, &count);
m_RingBuffer->MoveIn(count);
max_bytes_to_read -= count;
m_TotalBytesRead += count;
byte_space = m_RingBuffer->GetContiguousSpace();
nb_to_read = (max_bytes_to_read<byte_space)?max_bytes_to_read:byte_space;
// if we filled our contiguous space, and we wrapped, check if there is more to read
if (NPT_SUCCEEDED(res) && (nb_to_read > 0)) {
res = input.Read(m_RingBuffer->GetWritePointer(), nb_to_read, &count);
m_RingBuffer->MoveIn(count);
m_TotalBytesRead += count;
}
}
return res;
}
/*----------------------------------------------------------------------
| PLT_PipeInputStreamPump::PLT_PipeInputStreamPump
+---------------------------------------------------------------------*/
PLT_PipeInputStreamPump::PLT_PipeInputStreamPump(NPT_OutputStreamReference& output,
NPT_Size size) :
PLT_StreamPump(size),
m_Output(output),
m_LastRes(NPT_SUCCESS)
{
}
/*----------------------------------------------------------------------
| PLT_PipeInputStreamPump::~PLT_PipeInputStreamPump
+---------------------------------------------------------------------*/
PLT_PipeInputStreamPump::~PLT_PipeInputStreamPump()
{
}
/*----------------------------------------------------------------------
| PLT_PipeInputStreamPump::Receive
+---------------------------------------------------------------------*/
NPT_Result
PLT_PipeInputStreamPump::Receive(NPT_InputStream& input,
NPT_Size max_bytes_to_read,
NPT_Size* bytes_read)
{
NPT_Size count;
NPT_Result res;
if ((m_LastRes == NPT_SUCCESS) || (m_LastRes == NPT_ERROR_WOULD_BLOCK)) {
// look at what we have buffered already from out input
// and if have less than what was asked, read more
NPT_Size available = m_RingBuffer->GetAvailable();
if (available < max_bytes_to_read) {
m_LastRes = PullData(input, max_bytes_to_read-available);
}
} else if (!m_RingBuffer->GetAvailable()) {
// if the buffer is now empty, return the input last error
return m_LastRes;
}
// write as much as we can on the output stream
res = PushData(*m_Output, count);
if (bytes_read) *bytes_read = count;
return res;
}
/*----------------------------------------------------------------------
| PLT_PipeOutputStreamPump::PLT_PipeOutputStreamPump
+---------------------------------------------------------------------*/
PLT_PipeOutputStreamPump::PLT_PipeOutputStreamPump(NPT_InputStreamReference& input,
NPT_Size size /* 65535 */,
NPT_Size max_bytes_to_read /* = 0 */) :
PLT_StreamPump(size),
m_Input(input),
m_MaxBytesToRead(max_bytes_to_read),
m_LastRes(NPT_SUCCESS)
{
}
/*----------------------------------------------------------------------
| PLT_PipeOutputStreamPump::~PLT_PipeOutputStreamPump
+---------------------------------------------------------------------*/
PLT_PipeOutputStreamPump::~PLT_PipeOutputStreamPump()
{
}
/*----------------------------------------------------------------------
| PLT_PipeOutputStreamPump::Transmit
+---------------------------------------------------------------------*/
NPT_Result
PLT_PipeOutputStreamPump::Transmit(NPT_OutputStream& output)
{
NPT_Size count;
NPT_Result res;
if ((m_LastRes == NPT_SUCCESS) || (m_LastRes == NPT_ERROR_WOULD_BLOCK)) {
// fill the entire space by default
NPT_Size max_space = m_RingBuffer->GetSpace();
if (max_space) {
NPT_Size max_to_read = max_space;
if (m_MaxBytesToRead != 0) {
// if a total maximum amount was set, make sure we don't read more
max_to_read = ((m_MaxBytesToRead - m_TotalBytesRead) < max_space) ? (m_MaxBytesToRead - m_TotalBytesRead) : max_space;
}
// any data to read
if (max_to_read) {
m_LastRes = PullData(*m_Input, max_to_read);
} else {
m_LastRes = NPT_ERROR_EOS;
}
}
} else if (!m_RingBuffer->GetAvailable()) {
// if the buffer is now empty, return the input last error
return m_LastRes;
}
// write as much as we can on the output stream
res = PushData(output, count);
return res;
}
|
