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author | Björn Stenberg <bjorn@haxx.se> | 2007-01-08 23:53:00 +0000 |
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committer | Björn Stenberg <bjorn@haxx.se> | 2007-01-08 23:53:00 +0000 |
commit | 7039a05147b8bbfc829babea1c65bd436450b505 (patch) | |
tree | 4ba555eb84ed97b72b0575034d5b0530a393713e /songdbj/org/tritonus/share/TCircularBuffer.java | |
parent | 6d4c19707ef95942e323cbdc89fbbfdbe45e7cc5 (diff) | |
download | rockbox-7039a05147b8bbfc829babea1c65bd436450b505.tar.gz rockbox-7039a05147b8bbfc829babea1c65bd436450b505.zip |
Splitting out songdbj
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11953 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'songdbj/org/tritonus/share/TCircularBuffer.java')
-rw-r--r-- | songdbj/org/tritonus/share/TCircularBuffer.java | 268 |
1 files changed, 0 insertions, 268 deletions
diff --git a/songdbj/org/tritonus/share/TCircularBuffer.java b/songdbj/org/tritonus/share/TCircularBuffer.java deleted file mode 100644 index 11ebc0af01..0000000000 --- a/songdbj/org/tritonus/share/TCircularBuffer.java +++ /dev/null | |||
@@ -1,268 +0,0 @@ | |||
1 | /* | ||
2 | * TCircularBuffer.java | ||
3 | * | ||
4 | * This file is part of Tritonus: http://www.tritonus.org/ | ||
5 | */ | ||
6 | |||
7 | /* | ||
8 | * Copyright (c) 1999 by Matthias Pfisterer | ||
9 | * | ||
10 | * | ||
11 | * This program is free software; you can redistribute it and/or modify | ||
12 | * it under the terms of the GNU Library General Public License as published | ||
13 | * by the Free Software Foundation; either version 2 of the License, or | ||
14 | * (at your option) any later version. | ||
15 | * | ||
16 | * This program is distributed in the hope that it will be useful, | ||
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
19 | * GNU Library General Public License for more details. | ||
20 | * | ||
21 | * You should have received a copy of the GNU Library General Public | ||
22 | * License along with this program; if not, write to the Free Software | ||
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
24 | * | ||
25 | */ | ||
26 | |||
27 | /* | ||
28 | |<--- this code is formatted to fit into 80 columns --->| | ||
29 | */ | ||
30 | |||
31 | package org.tritonus.share; | ||
32 | |||
33 | import org.tritonus.share.TDebug; | ||
34 | |||
35 | |||
36 | |||
37 | public class TCircularBuffer | ||
38 | { | ||
39 | private boolean m_bBlockingRead; | ||
40 | private boolean m_bBlockingWrite; | ||
41 | private byte[] m_abData; | ||
42 | private int m_nSize; | ||
43 | private long m_lReadPos; | ||
44 | private long m_lWritePos; | ||
45 | private Trigger m_trigger; | ||
46 | private boolean m_bOpen; | ||
47 | |||
48 | |||
49 | |||
50 | public TCircularBuffer(int nSize, boolean bBlockingRead, boolean bBlockingWrite, Trigger trigger) | ||
51 | { | ||
52 | m_bBlockingRead = bBlockingRead; | ||
53 | m_bBlockingWrite = bBlockingWrite; | ||
54 | m_nSize = nSize; | ||
55 | m_abData = new byte[m_nSize]; | ||
56 | m_lReadPos = 0; | ||
57 | m_lWritePos = 0; | ||
58 | m_trigger = trigger; | ||
59 | m_bOpen = true; | ||
60 | } | ||
61 | |||
62 | |||
63 | |||
64 | public void close() | ||
65 | { | ||
66 | m_bOpen = false; | ||
67 | // TODO: call notify() ? | ||
68 | } | ||
69 | |||
70 | |||
71 | |||
72 | private boolean isOpen() | ||
73 | { | ||
74 | return m_bOpen; | ||
75 | } | ||
76 | |||
77 | |||
78 | public int availableRead() | ||
79 | { | ||
80 | return (int) (m_lWritePos - m_lReadPos); | ||
81 | } | ||
82 | |||
83 | |||
84 | |||
85 | public int availableWrite() | ||
86 | { | ||
87 | return m_nSize - availableRead(); | ||
88 | } | ||
89 | |||
90 | |||
91 | |||
92 | private int getReadPos() | ||
93 | { | ||
94 | return (int) (m_lReadPos % m_nSize); | ||
95 | } | ||
96 | |||
97 | |||
98 | |||
99 | private int getWritePos() | ||
100 | { | ||
101 | return (int) (m_lWritePos % m_nSize); | ||
102 | } | ||
103 | |||
104 | |||
105 | |||
106 | public int read(byte[] abData) | ||
107 | { | ||
108 | return read(abData, 0, abData.length); | ||
109 | } | ||
110 | |||
111 | |||
112 | |||
113 | public int read(byte[] abData, int nOffset, int nLength) | ||
114 | { | ||
115 | if (TDebug.TraceCircularBuffer) | ||
116 | { | ||
117 | TDebug.out(">TCircularBuffer.read(): called."); | ||
118 | dumpInternalState(); | ||
119 | } | ||
120 | if (! isOpen()) | ||
121 | { | ||
122 | if (availableRead() > 0) | ||
123 | { | ||
124 | nLength = Math.min(nLength, availableRead()); | ||
125 | if (TDebug.TraceCircularBuffer) { TDebug.out("reading rest in closed buffer, length: " + nLength); } | ||
126 | } | ||
127 | else | ||
128 | { | ||
129 | if (TDebug.TraceCircularBuffer) { TDebug.out("< not open. returning -1."); } | ||
130 | return -1; | ||
131 | } | ||
132 | } | ||
133 | synchronized (this) | ||
134 | { | ||
135 | if (m_trigger != null && availableRead() < nLength) | ||
136 | { | ||
137 | if (TDebug.TraceCircularBuffer) { TDebug.out("executing trigger."); } | ||
138 | m_trigger.execute(); | ||
139 | } | ||
140 | if (!m_bBlockingRead) | ||
141 | { | ||
142 | nLength = Math.min(availableRead(), nLength); | ||
143 | } | ||
144 | int nRemainingBytes = nLength; | ||
145 | while (nRemainingBytes > 0) | ||
146 | { | ||
147 | while (availableRead() == 0) | ||
148 | { | ||
149 | try | ||
150 | { | ||
151 | wait(); | ||
152 | } | ||
153 | catch (InterruptedException e) | ||
154 | { | ||
155 | if (TDebug.TraceAllExceptions) | ||
156 | { | ||
157 | TDebug.out(e); | ||
158 | } | ||
159 | } | ||
160 | } | ||
161 | int nAvailable = Math.min(availableRead(), nRemainingBytes); | ||
162 | while (nAvailable > 0) | ||
163 | { | ||
164 | int nToRead = Math.min(nAvailable, m_nSize - getReadPos()); | ||
165 | System.arraycopy(m_abData, getReadPos(), abData, nOffset, nToRead); | ||
166 | m_lReadPos += nToRead; | ||
167 | nOffset += nToRead; | ||
168 | nAvailable -= nToRead; | ||
169 | nRemainingBytes -= nToRead; | ||
170 | } | ||
171 | notifyAll(); | ||
172 | } | ||
173 | if (TDebug.TraceCircularBuffer) | ||
174 | { | ||
175 | TDebug.out("After read:"); | ||
176 | dumpInternalState(); | ||
177 | TDebug.out("< completed. Read " + nLength + " bytes"); | ||
178 | } | ||
179 | return nLength; | ||
180 | } | ||
181 | } | ||
182 | |||
183 | |||
184 | public int write(byte[] abData) | ||
185 | { | ||
186 | return write(abData, 0, abData.length); | ||
187 | } | ||
188 | |||
189 | |||
190 | |||
191 | public int write(byte[] abData, int nOffset, int nLength) | ||
192 | { | ||
193 | if (TDebug.TraceCircularBuffer) | ||
194 | { | ||
195 | TDebug.out(">TCircularBuffer.write(): called; nLength: " + nLength); | ||
196 | dumpInternalState(); | ||
197 | } | ||
198 | synchronized (this) | ||
199 | { | ||
200 | if (TDebug.TraceCircularBuffer) { TDebug.out("entered synchronized block."); } | ||
201 | if (!m_bBlockingWrite) | ||
202 | { | ||
203 | nLength = Math.min(availableWrite(), nLength); | ||
204 | } | ||
205 | int nRemainingBytes = nLength; | ||
206 | while (nRemainingBytes > 0) | ||
207 | { | ||
208 | while (availableWrite() == 0) | ||
209 | { | ||
210 | try | ||
211 | { | ||
212 | wait(); | ||
213 | } | ||
214 | catch (InterruptedException e) | ||
215 | { | ||
216 | if (TDebug.TraceAllExceptions) | ||
217 | { | ||
218 | TDebug.out(e); | ||
219 | } | ||
220 | } | ||
221 | } | ||
222 | int nAvailable = Math.min(availableWrite(), nRemainingBytes); | ||
223 | while (nAvailable > 0) | ||
224 | { | ||
225 | int nToWrite = Math.min(nAvailable, m_nSize - getWritePos()); | ||
226 | //TDebug.out("src buf size= " + abData.length + ", offset = " + nOffset + ", dst buf size=" + m_abData.length + " write pos=" + getWritePos() + " len=" + nToWrite); | ||
227 | System.arraycopy(abData, nOffset, m_abData, getWritePos(), nToWrite); | ||
228 | m_lWritePos += nToWrite; | ||
229 | nOffset += nToWrite; | ||
230 | nAvailable -= nToWrite; | ||
231 | nRemainingBytes -= nToWrite; | ||
232 | } | ||
233 | notifyAll(); | ||
234 | } | ||
235 | if (TDebug.TraceCircularBuffer) | ||
236 | { | ||
237 | TDebug.out("After write:"); | ||
238 | dumpInternalState(); | ||
239 | TDebug.out("< completed. Wrote "+nLength+" bytes"); | ||
240 | } | ||
241 | return nLength; | ||
242 | } | ||
243 | } | ||
244 | |||
245 | |||
246 | |||
247 | private void dumpInternalState() | ||
248 | { | ||
249 | TDebug.out("m_lReadPos = " + m_lReadPos + " ^= "+getReadPos()); | ||
250 | TDebug.out("m_lWritePos = " + m_lWritePos + " ^= "+getWritePos()); | ||
251 | TDebug.out("availableRead() = " + availableRead()); | ||
252 | TDebug.out("availableWrite() = " + availableWrite()); | ||
253 | } | ||
254 | |||
255 | |||
256 | |||
257 | public static interface Trigger | ||
258 | { | ||
259 | public void execute(); | ||
260 | } | ||
261 | |||
262 | |||
263 | } | ||
264 | |||
265 | |||
266 | |||
267 | /*** TCircularBuffer.java ***/ | ||
268 | |||