Source Code Cross Referenced for MsgAjp.java in  » Sevlet-Container » tomcat-connectors » org » apache » jk » common » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat connectors » org.apache.jk.common 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 1999-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:
017:        package org.apache.jk.common;
018:
019:        import java.io.IOException;
020:
021:        import org.apache.jk.core.Msg;
022:        import org.apache.tomcat.util.buf.ByteChunk;
023:        import org.apache.tomcat.util.buf.MessageBytes;
024:
025:        /**
026:         * A single packet for communication between the web server and the
027:         * container.  Designed to be reused many times with no creation of
028:         * garbage.  Understands the format of data types for these packets.
029:         * Can be used (somewhat confusingly) for both incoming and outgoing
030:         * packets.  
031:         *
032:         * @see Ajp14/Ajp13Packet 
033:         *
034:         * @author Henri Gomez [hgomez@apache.org]
035:         * @author Dan Milstein [danmil@shore.net]
036:         * @author Keith Wannamaker [Keith@Wannamaker.org]
037:         * @author Kevin Seguin
038:         * @author Costin Manolache
039:         */
040:        public class MsgAjp extends Msg {
041:            private static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory
042:                    .getLog(MsgAjp.class);
043:
044:            // that's the original buffer size in ajp13 - otherwise we'll get interoperability problems.
045:            private byte buf[] = new byte[8 * 1024];
046:            // The current read or write position in the buffer
047:            private int pos;
048:            /**
049:             * This actually means different things depending on whether the
050:             * packet is read or write.  For read, it's the length of the
051:             * payload (excluding the header).  For write, it's the length of
052:             * the packet as a whole (counting the header).  Oh, well.
053:             */
054:            private int len;
055:
056:            /**
057:             * Prepare this packet for accumulating a message from the container to
058:             * the web server.  Set the write position to just after the header
059:             * (but leave the length unwritten, because it is as yet unknown).
060:             */
061:            public void reset() {
062:                len = 4;
063:                pos = 4;
064:            }
065:
066:            /**
067:             * For a packet to be sent to the web server, finish the process of
068:             * accumulating data and write the length of the data payload into
069:             * the header.  
070:             */
071:            public void end() {
072:                len = pos;
073:                int dLen = len - 4;
074:
075:                buf[0] = (byte) 0x41;
076:                buf[1] = (byte) 0x42;
077:                buf[2] = (byte) ((dLen >>> 8) & 0xFF);
078:                buf[3] = (byte) (dLen & 0xFF);
079:            }
080:
081:            public byte[] getBuffer() {
082:                return buf;
083:            }
084:
085:            public int getLen() {
086:                return len;
087:            }
088:
089:            // ============ Data Writing Methods ===================
090:
091:            /**
092:             * Add an int.
093:             *
094:             * @param val The integer to write.
095:             */
096:            public void appendInt(int val) {
097:                buf[pos++] = (byte) ((val >>> 8) & 0xFF);
098:                buf[pos++] = (byte) (val & 0xFF);
099:            }
100:
101:            public void appendByte(int val) {
102:                buf[pos++] = (byte) val;
103:            }
104:
105:            public void appendLongInt(int val) {
106:                buf[pos++] = (byte) ((val >>> 24) & 0xFF);
107:                buf[pos++] = (byte) ((val >>> 16) & 0xFF);
108:                buf[pos++] = (byte) ((val >>> 8) & 0xFF);
109:                buf[pos++] = (byte) (val & 0xFF);
110:            }
111:
112:            /**
113:             * Write a String out at the current write position.  Strings are
114:             * encoded with the length in two bytes first, then the string, and
115:             * then a terminating \0 (which is <B>not</B> included in the
116:             * encoded length).  The terminator is for the convenience of the C
117:             * code, where it saves a round of copying.  A null string is
118:             * encoded as a string with length 0.  
119:             */
120:            public void appendBytes(MessageBytes mb) throws IOException {
121:                if (mb == null || mb.isNull()) {
122:                    appendInt(0);
123:                    appendByte(0);
124:                    return;
125:                }
126:
127:                // XXX Convert !!
128:                ByteChunk bc = mb.getByteChunk();
129:                appendByteChunk(bc);
130:            }
131:
132:            public void appendByteChunk(ByteChunk bc) throws IOException {
133:                if (bc == null) {
134:                    log.error("appendByteChunk() null");
135:                    appendInt(0);
136:                    appendByte(0);
137:                    return;
138:                }
139:
140:                byte[] bytes = bc.getBytes();
141:                int start = bc.getStart();
142:                appendInt(bc.getLength());
143:                cpBytes(bytes, start, bc.getLength());
144:                appendByte(0);
145:            }
146:
147:            /** 
148:             * Copy a chunk of bytes into the packet, starting at the current
149:             * write position.  The chunk of bytes is encoded with the length
150:             * in two bytes first, then the data itself, and finally a
151:             * terminating \0 (which is <B>not</B> included in the encoded
152:             * length).
153:             *
154:             * @param b The array from which to copy bytes.
155:             * @param off The offset into the array at which to start copying
156:             * @param len The number of bytes to copy.  
157:             */
158:            public void appendBytes(byte b[], int off, int numBytes) {
159:                appendInt(numBytes);
160:                cpBytes(b, off, numBytes);
161:                appendByte(0);
162:            }
163:
164:            private void cpBytes(byte b[], int off, int numBytes) {
165:                if (pos + numBytes >= buf.length) {
166:                    log.error("Buffer overflow: buffer.len=" + buf.length
167:                            + " pos=" + pos + " data=" + numBytes);
168:                    dump("Overflow/coBytes");
169:                    log.error("Overflow ", new Throwable());
170:                    return;
171:                }
172:                System.arraycopy(b, off, buf, pos, numBytes);
173:                pos += numBytes;
174:                // buf[pos + numBytes] = 0; // Terminating \0
175:            }
176:
177:            // ============ Data Reading Methods ===================
178:
179:            /**
180:             * Read an integer from packet, and advance the read position past
181:             * it.  Integers are encoded as two unsigned bytes with the
182:             * high-order byte first, and, as far as I can tell, in
183:             * little-endian order within each byte.  
184:             */
185:            public int getInt() {
186:                int b1 = buf[pos++] & 0xFF; // No swap, Java order
187:                int b2 = buf[pos++] & 0xFF;
188:
189:                return (b1 << 8) + b2;
190:            }
191:
192:            public int peekInt() {
193:                int b1 = buf[pos] & 0xFF; // No swap, Java order
194:                int b2 = buf[pos + 1] & 0xFF;
195:
196:                return (b1 << 8) + b2;
197:            }
198:
199:            public byte getByte() {
200:                byte res = buf[pos++];
201:                return res;
202:            }
203:
204:            public byte peekByte() {
205:                byte res = buf[pos];
206:                return res;
207:            }
208:
209:            public void getBytes(MessageBytes mb) {
210:                int length = getInt();
211:                if ((length == 0xFFFF) || (length == -1)) {
212:                    mb.setString(null);
213:                    return;
214:                }
215:                mb.setBytes(buf, pos, length);
216:                pos += length;
217:                pos++; // Skip the terminating \0
218:            }
219:
220:            /**
221:             * Copy a chunk of bytes from the packet into an array and advance
222:             * the read position past the chunk.  See appendBytes() for details
223:             * on the encoding.
224:             *
225:             * @return The number of bytes copied.
226:             */
227:            public int getBytes(byte dest[]) {
228:                int length = getInt();
229:                if (length > buf.length) {
230:                    // XXX Should be if(pos + length > buff.legth)?
231:                    log.error("getBytes() buffer overflow " + length + " "
232:                            + buf.length);
233:                }
234:
235:                if ((length == 0xFFFF) || (length == -1)) {
236:                    log.info("Null string " + length);
237:                    return 0;
238:                }
239:
240:                System.arraycopy(buf, pos, dest, 0, length);
241:                pos += length;
242:                pos++; // Skip terminating \0  XXX I believe this is wrong but harmless
243:                return length;
244:            }
245:
246:            /**
247:             * Read a 32 bits integer from packet, and advance the read position past
248:             * it.  Integers are encoded as four unsigned bytes with the
249:             * high-order byte first, and, as far as I can tell, in
250:             * little-endian order within each byte.
251:             */
252:            public int getLongInt() {
253:                int b1 = buf[pos++] & 0xFF; // No swap, Java order
254:                b1 <<= 8;
255:                b1 |= (buf[pos++] & 0xFF);
256:                b1 <<= 8;
257:                b1 |= (buf[pos++] & 0xFF);
258:                b1 <<= 8;
259:                b1 |= (buf[pos++] & 0xFF);
260:                return b1;
261:            }
262:
263:            public int getHeaderLength() {
264:                return 4;
265:            }
266:
267:            public int processHeader() {
268:                pos = 0;
269:                int mark = getInt();
270:                len = getInt();
271:
272:                if (mark != 0x1234 && mark != 0x4142) {
273:                    // XXX Logging
274:                    log.error("BAD packet signature " + mark);
275:                    dump("In: ");
276:                    return -1;
277:                }
278:
279:                if (log.isDebugEnabled())
280:                    log.debug("Received " + len + " " + buf[0]);
281:                return len;
282:            }
283:
284:            public void dump(String msg) {
285:                log.debug(msg + ": " + buf + " " + pos + "/" + (len + 4));
286:                int max = pos;
287:                if (len + 4 > pos)
288:                    max = len + 4;
289:                if (max > 1000)
290:                    max = 1000;
291:                for (int j = 0; j < max; j += 16)
292:                    System.out.println(hexLine(buf, j, len));
293:
294:            }
295:
296:            /* -------------------- Utilities -------------------- */
297:            // XXX Move to util package
298:            public static String hexLine(byte buf[], int start, int len) {
299:                StringBuffer sb = new StringBuffer();
300:                for (int i = start; i < start + 16; i++) {
301:                    if (i < len + 4)
302:                        sb.append(hex(buf[i]) + " ");
303:                    else
304:                        sb.append("   ");
305:                }
306:                sb.append(" | ");
307:                for (int i = start; i < start + 16 && i < len + 4; i++) {
308:                    if (!Character.isISOControl((char) buf[i]))
309:                        sb.append(new Character((char) buf[i]));
310:                    else
311:                        sb.append(".");
312:                }
313:                return sb.toString();
314:            }
315:
316:            private static String hex(int x) {
317:                //	    if( x < 0) x=256 + x;
318:                String h = Integer.toHexString(x);
319:                if (h.length() == 1)
320:                    h = "0" + h;
321:                return h.substring(h.length() - 2);
322:            }
323:
324:        }
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