Source Code Cross Referenced for InflaterInputStream.java in  » 6.0-JDK-Modules » j2me » java » util » zip » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.util.zip 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)InflaterInputStream.java	1.38 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.util.zip;
029:
030:        import java.io.FilterInputStream;
031:        import java.io.InputStream;
032:        import java.io.IOException;
033:        import java.io.EOFException;
034:
035:        /**
036:         * This class implements a stream filter for uncompressing data in the
037:         * "deflate" compression format. It is also used as the basis for other
038:         * decompression filters, such as GZIPInputStream.
039:         * NOTE: <B>java.util.zip.GZIPInputStream</B> is found in J2ME CDC profiles 
040:         * such as J2ME Foundation Profile.
041:         *
042:         * @see		Inflater
043:         * @version 	1.28, 02/02/00
044:         * @author 	David Connelly
045:         */
046:        public class InflaterInputStream extends FilterInputStream {
047:            /**
048:             * Decompressor for this stream.
049:             */
050:            protected Inflater inf;
051:
052:            /**
053:             * Input buffer for decompression.
054:             */
055:            protected byte[] buf;
056:
057:            /**
058:             * Length of input buffer.
059:             */
060:            protected int len;
061:
062:            private boolean closed = false;
063:            // this flag is set to true after EOF has reached
064:            private boolean reachEOF = false;
065:
066:            /**
067:             * Check to make sure that this stream has not been closed
068:             */
069:            private void ensureOpen() throws IOException {
070:                if (closed) {
071:                    throw new IOException("Stream closed");
072:                }
073:            }
074:
075:            /**
076:             * Creates a new input stream with the specified decompressor and
077:             * buffer size.
078:             * @param in the input stream
079:             * @param inf the decompressor ("inflater")
080:             * @param size the input buffer size
081:             * @exception IllegalArgumentException if size is <= 0
082:             */
083:            public InflaterInputStream(InputStream in, Inflater inf, int size) {
084:                super (in);
085:                if (in == null || inf == null) {
086:                    throw new NullPointerException();
087:                } else if (size <= 0) {
088:                    throw new IllegalArgumentException("buffer size <= 0");
089:                }
090:                this .inf = inf;
091:                buf = new byte[size];
092:            }
093:
094:            /**
095:             * Creates a new input stream with the specified decompressor and a
096:             * default buffer size.
097:             * @param in the input stream
098:             * @param inf the decompressor ("inflater")
099:             */
100:            public InflaterInputStream(InputStream in, Inflater inf) {
101:                this (in, inf, 512);
102:            }
103:
104:            boolean usesDefaultInflater = false;
105:
106:            /**
107:             * Creates a new input stream with a default decompressor and buffer size.
108:             * @param in the input stream
109:             */
110:            public InflaterInputStream(InputStream in) {
111:                this (in, new Inflater());
112:                usesDefaultInflater = true;
113:            }
114:
115:            private byte[] singleByteBuf = new byte[1];
116:
117:            /**
118:             * Reads a byte of uncompressed data. This method will block until
119:             * enough input is available for decompression.
120:             * @return the byte read, or -1 if end of compressed input is reached
121:             * @exception IOException if an I/O error has occurred
122:             */
123:            public int read() throws IOException {
124:                ensureOpen();
125:                return read(singleByteBuf, 0, 1) == -1 ? -1
126:                        : singleByteBuf[0] & 0xff;
127:            }
128:
129:            /**
130:             * Reads uncompressed data into an array of bytes. This method will
131:             * block until some input can be decompressed.
132:             * @param b the buffer into which the data is read
133:             * @param off the start offset of the data
134:             * @param len the maximum number of bytes read
135:             * @return the actual number of bytes read, or -1 if the end of the
136:             *         compressed input is reached or a preset dictionary is needed
137:             * @exception ZipException if a ZIP format error has occurred
138:             * @exception IOException if an I/O error has occurred
139:             */
140:            public int read(byte[] b, int off, int len) throws IOException {
141:                ensureOpen();
142:                if ((off | len | (off + len) | (b.length - (off + len))) < 0) {
143:                    throw new IndexOutOfBoundsException();
144:                } else if (len == 0) {
145:                    return 0;
146:                }
147:                try {
148:                    int bytesRead = 0;
149:                    while (len > 0) {
150:                        int n = inf.inflate(b, off, len);
151:                        if (n == 0) {
152:                            if (inf.finished() || inf.needsDictionary()) {
153:                                reachEOF = true;
154:                                if (bytesRead > 0) {
155:                                    return bytesRead;
156:                                } else {
157:                                    return -1;
158:                                }
159:                            }
160:                            if (inf.needsInput()) {
161:                                fill();
162:                            }
163:                        }
164:                        bytesRead += n;
165:                        off += n;
166:                        len -= n;
167:                    }
168:                    return bytesRead;
169:                } catch (DataFormatException e) {
170:                    String s = e.getMessage();
171:                    throw new ZipException(s != null ? s
172:                            : "Invalid ZLIB data format");
173:                }
174:            }
175:
176:            /**
177:             * Returns 0 after EOF has reached, otherwise always return 1.
178:             * <p>
179:             * Programs should not count on this method to return the actual number
180:             * of bytes that could be read without blocking.
181:             *
182:             * @return     1 before EOF and 0 after EOF.
183:             * @exception  IOException  if an I/O error occurs.
184:             * 
185:             */
186:            public int available() throws IOException {
187:                ensureOpen();
188:                if (reachEOF) {
189:                    return 0;
190:                } else {
191:                    return 1;
192:                }
193:            }
194:
195:            private byte[] b = new byte[512];
196:
197:            /**
198:             * Skips specified number of bytes of uncompressed data.
199:             * @param n the number of bytes to skip
200:             * @return the actual number of bytes skipped.
201:             * @exception IOException if an I/O error has occurred
202:             * @exception IllegalArgumentException if n < 0
203:             */
204:            public long skip(long n) throws IOException {
205:                if (n < 0) {
206:                    throw new IllegalArgumentException("negative skip length");
207:                }
208:                ensureOpen();
209:                int max = (int) Math.min(n, Integer.MAX_VALUE);
210:                int total = 0;
211:                while (total < max) {
212:                    int len = max - total;
213:                    if (len > b.length) {
214:                        len = b.length;
215:                    }
216:                    len = read(b, 0, len);
217:                    if (len == -1) {
218:                        reachEOF = true;
219:                        break;
220:                    }
221:                    total += len;
222:                }
223:                return total;
224:            }
225:
226:            /**
227:             * Closes the input stream.
228:             * @exception IOException if an I/O error has occurred
229:             */
230:            public void close() throws IOException {
231:                if (!closed) {
232:                    if (usesDefaultInflater)
233:                        inf.end();
234:                    in.close();
235:                    closed = true;
236:                }
237:            }
238:
239:            /**
240:             * Fills input buffer with more data to decompress.
241:             * @exception IOException if an I/O error has occurred
242:             */
243:            protected void fill() throws IOException {
244:                ensureOpen();
245:                len = in.read(buf, 0, buf.length);
246:                if (len == -1) {
247:                    throw new EOFException(
248:                            "Unexpected end of ZLIB input stream");
249:                }
250:                inf.setInput(buf, 0, len);
251:            }
252:        }
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