001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2013 GRANITE DATA SERVICES S.A.S.
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.messaging.jmf.codec.std.impl;
022
023 import java.io.IOException;
024 import java.io.OutputStream;
025
026 import org.granite.messaging.jmf.DumpContext;
027 import org.granite.messaging.jmf.InputContext;
028 import org.granite.messaging.jmf.OutputContext;
029 import org.granite.messaging.jmf.codec.std.IntegerCodec;
030
031 /**
032 * @author Franck WOLFF
033 */
034 public class IntegerCodecImpl extends AbstractIntegerStringCodec<Integer> implements IntegerCodec {
035
036 public int getObjectType() {
037 return JMF_INTEGER_OBJECT;
038 }
039
040 public Class<?> getObjectClass() {
041 return Integer.class;
042 }
043
044 public int getPrimitiveType() {
045 return JMF_INTEGER;
046 }
047
048 public Class<?> getPrimitiveClass() {
049 return Integer.TYPE;
050 }
051
052 public void encode(OutputContext ctx, Integer v) throws IOException {
053 writeIntData(ctx, JMF_INTEGER_OBJECT, v.intValue());
054 }
055
056 public Integer decode(InputContext ctx, int parameterizedJmfType) throws IOException {
057 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
058
059 if (jmfType != JMF_INTEGER_OBJECT)
060 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
061
062 return Integer.valueOf(readIntData(ctx, parameterizedJmfType));
063 }
064
065 public void encodePrimitive(OutputContext ctx, int v) throws IOException {
066 writeIntData(ctx, JMF_INTEGER, v);
067 }
068
069 public int decodePrimitive(InputContext ctx) throws IOException {
070 int parameterizedJmfType = ctx.safeRead();
071 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
072
073 if (jmfType != JMF_INTEGER)
074 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
075
076 return readIntData(ctx, parameterizedJmfType);
077 }
078
079 public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
080 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
081
082 switch (jmfType) {
083 case JMF_INTEGER:
084 ctx.indentPrintLn("int: " + readIntData(ctx, parameterizedJmfType));
085 break;
086 case JMF_INTEGER_OBJECT:
087 ctx.indentPrintLn(Integer.class.getName() + ": " + Integer.valueOf(readIntData(ctx, parameterizedJmfType)));
088 break;
089 default:
090 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
091 }
092 }
093
094 protected void writeIntData(OutputContext ctx, int jmfType, int v) throws IOException {
095 IntegerComponents ics = intComponents(v);
096 ctx.getOutputStream().write((ics.sign << 7) | (ics.length << 5) | jmfType);
097 writeIntData(ctx, ics);
098 }
099
100 protected int readIntData(InputContext ctx, int parameterizedJmfType) throws IOException {
101 return readIntData(ctx, (parameterizedJmfType >> 5) & 0x03, (parameterizedJmfType & 0x80) != 0);
102 }
103
104 public void writeVariableInt(OutputContext ctx, int v) throws IOException {
105
106 final OutputStream os = ctx.getOutputStream();
107
108 if (v == Integer.MIN_VALUE)
109 os.write(0x80); // negative 0.
110 else {
111 int sign = 0x00;
112 if (v < 0) {
113 sign = 0x80;
114 v = -v;
115 }
116
117 int bytesCount = lengthOfVariableAbsoluteInt(v);
118 v -= deltaForVariableAbsoluteIntLength(bytesCount);
119
120 switch (bytesCount) {
121 case 0:
122 os.write(sign | v);
123 break;
124 case 1: case 2: case 3:
125 os.write(sign | 0x40 | (v >> (bytesCount * 7)));
126 for (int i = bytesCount - 1; i > 0; i--)
127 os.write(0x80 | (v >> (i * 7)));
128 os.write(0x7F & v);
129 break;
130 case 4:
131 os.write(sign | 0x40 | (v >> 29));
132 os.write(0x80 | (v >> 22));
133 os.write(0x80 | (v >> 15));
134 os.write(0x80 | (v >> 8));
135 os.write(v);
136 break;
137 }
138 }
139 }
140
141 public int readVariableInt(InputContext ctx) throws IOException {
142 int v = ctx.safeRead();
143
144 if (v == 0x80)
145 v = Integer.MIN_VALUE;
146 else {
147 boolean opposite = ((v & 0x80) != 0);
148 boolean readNext = (v & 0x40) != 0;
149
150 v &= 0x3F;
151
152 if (readNext) {
153 int l = 1;
154 for (int i = 1; i <= 3; i++) {
155 int u = ctx.safeRead();
156 v = (v << 7) | (u & 0x7F);
157 if ((u & 0x80) == 0) {
158 readNext = false;
159 break;
160 }
161 l++;
162 }
163 if (readNext)
164 v = (v << 8) | ctx.safeRead();
165 v += deltaForVariableAbsoluteIntLength(l);
166 }
167
168 if (opposite)
169 v = -v;
170 }
171
172 return v;
173 }
174
175 protected static final int[] VARIABLE_INT_DELTAS = new int[5];
176 static {
177 VARIABLE_INT_DELTAS[0] = 0;
178 for (int i = 1; i < VARIABLE_INT_DELTAS.length; i++)
179 VARIABLE_INT_DELTAS[i] = (VARIABLE_INT_DELTAS[i-1] << 7) | 0x40;
180 }
181
182 protected static int lengthOfVariableAbsoluteInt(int abs) {
183 for (int i = 1; i < VARIABLE_INT_DELTAS.length; i++) {
184 if (abs < VARIABLE_INT_DELTAS[i])
185 return (i - 1);
186 }
187 return 4;
188 }
189
190 protected static int deltaForVariableAbsoluteIntLength(int len) {
191 return VARIABLE_INT_DELTAS[len];
192 }
193 }