Source Code Cross Referenced for ChunkedInputStream.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » server » http » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.server.http 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.server.http;
030:
031:        import com.caucho.vfs.ReadStream;
032:        import com.caucho.vfs.StreamImpl;
033:
034:        import java.io.IOException;
035:
036:        /**
037:         * StreamImpl so servlets can read POST data as a normal stream.
038:         */
039:        class ChunkedInputStream extends StreamImpl {
040:            private ReadStream _next;
041:            private int _available;
042:
043:            void init(ReadStream next) {
044:                _next = next;
045:                _available = 0;
046:            }
047:
048:            public boolean canRead() {
049:                return true;
050:            }
051:
052:            public int getAvailable() {
053:                return _available;
054:            }
055:
056:            /**
057:             * Reads more data from the input stream.
058:             */
059:            public int read(byte[] buf, int offset, int len) throws IOException {
060:                // The chunk still has more data left
061:                if (_available > 0) {
062:                    if (_available < len)
063:                        len = _available;
064:
065:                    len = _next.read(buf, offset, len);
066:
067:                    if (len > 0)
068:                        _available -= len;
069:                }
070:                // The chunk is done, so read the next chunk
071:                else if (_available == 0) {
072:                    _available = readChunkLength();
073:
074:                    // the new chunk has data
075:                    if (_available > 0) {
076:                        if (_available < len)
077:                            len = _available;
078:
079:                        len = _next.read(buf, offset, len);
080:
081:                        if (len > 0)
082:                            _available -= len;
083:                    }
084:                    // the new chunk is the last
085:                    else {
086:                        _available = -1;
087:                        len = -1;
088:                    }
089:                } else
090:                    len = -1;
091:
092:                return len;
093:            }
094:
095:            /**
096:             * Reads the next chunk length from the input stream.
097:             */
098:            private int readChunkLength() throws IOException {
099:                int length = 0;
100:                int ch;
101:
102:                // skip whitespace
103:                for (ch = _next.read(); ch == '\r' || ch == ' ' || ch == '\n'; ch = _next
104:                        .read()) {
105:                }
106:
107:                // XXX: This doesn't properly handle the case when when the browser
108:                // sends headers at the end of the data.  See the HTTP/1.1 spec.
109:                for (; ch > 0 && ch != '\r' && ch != '\n'; ch = _next.read()) {
110:                    if (ch >= '0' && ch <= '9')
111:                        length = 16 * length + ch - '0';
112:                    else if (ch >= 'a' && ch <= 'f')
113:                        length = 16 * length + ch - 'a' + 10;
114:                    else if (ch >= 'A' && ch <= 'F')
115:                        length = 16 * length + ch - 'A' + 10;
116:                    else if (ch == ' ' || ch == '\t') {
117:                        //if (dbg.canWrite())
118:                        //  dbg.println("unexpected chunk whitespace.");
119:                    } else
120:                        throw new IOException(
121:                                "HTTP/1.1 protocol error: bad chunk");
122:                }
123:
124:                if (ch == '\r')
125:                    ch = _next.read();
126:
127:                return length;
128:            }
129:        }
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