Source Code Cross Referenced for Base64Decoder.java in  » Report » jasperreports-2.0.1 » org » w3c » tools » codec » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Report » jasperreports 2.0.1 » org.w3c.tools.codec 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright © World Wide Web Consortium, (Massachusetts Institute of Technology, 
003:         * Institut National de Recherche en Informatique et en Automatique, Keio University).
004:         * All Rights Reserved. http://www.w3.org/Consortium/Legal/
005:         */
006:        package org.w3c.tools.codec;
007:
008:        import java.io.ByteArrayInputStream;
009:        import java.io.ByteArrayOutputStream;
010:        import java.io.FileInputStream;
011:        import java.io.IOException;
012:        import java.io.InputStream;
013:        import java.io.OutputStream;
014:        import java.io.UnsupportedEncodingException;
015:
016:        /**
017:         * Decode a BASE64 encoded input stream to some output stream.
018:         * This class implements BASE64 decoding, as specified in the
019:         * <a href="http://ds.internic.net/rfc/rfc1521.txt">MIME specification</a>.
020:         * @see org.w3c.tools.codec.Base64Encoder
021:         */
022:        public class Base64Decoder {
023:            private static final int BUFFER_SIZE = 1024;
024:
025:            InputStream in = null;
026:            OutputStream out = null;
027:            boolean stringp = false;
028:
029:            private void printHex(int x) {
030:                int h = (x & 0xf0) >> 4;
031:                int l = (x & 0x0f);
032:                System.out.print((new Character((char) ((h > 9) ? 'A' + h - 10
033:                        : '0' + h))).toString()
034:                        + (new Character((char) ((l > 9) ? 'A' + l - 10
035:                                : '0' + l))).toString());
036:            }
037:
038:            private void printHex(byte buf[], int off, int len) {
039:                while (off < len) {
040:                    printHex(buf[off++]);
041:                    System.out.print(" ");
042:                }
043:                System.out.println("");
044:            }
045:
046:            private void printHex(String s) {
047:                byte bytes[];
048:                try {
049:                    bytes = s.getBytes("ISO-8859-1");
050:                } catch (UnsupportedEncodingException ex) {
051:                    throw new RuntimeException(this .getClass().getName()
052:                            + "[printHex] Unable to convert"
053:                            + "properly char to bytes");
054:                }
055:                printHex(bytes, 0, bytes.length);
056:            }
057:
058:            private final int get1(byte buf[], int off) {
059:                return ((buf[off] & 0x3f) << 2) | ((buf[off + 1] & 0x30) >>> 4);
060:            }
061:
062:            private final int get2(byte buf[], int off) {
063:                return ((buf[off + 1] & 0x0f) << 4)
064:                        | ((buf[off + 2] & 0x3c) >>> 2);
065:            }
066:
067:            private final int get3(byte buf[], int off) {
068:                return ((buf[off + 2] & 0x03) << 6) | (buf[off + 3] & 0x3f);
069:            }
070:
071:            private final int check(int ch) {
072:                if ((ch >= 'A') && (ch <= 'Z')) {
073:                    return ch - 'A';
074:                } else if ((ch >= 'a') && (ch <= 'z')) {
075:                    return ch - 'a' + 26;
076:                } else if ((ch >= '0') && (ch <= '9')) {
077:                    return ch - '0' + 52;
078:                } else {
079:                    switch (ch) {
080:                    case '=':
081:                        return 65;
082:                    case '+':
083:                        return 62;
084:                    case '/':
085:                        return 63;
086:                    default:
087:                        return -1;
088:                    }
089:                }
090:            }
091:
092:            /**
093:             * Do the actual decoding.
094:             * Process the input stream by decoding it and emiting the resulting bytes
095:             * into the output stream.
096:             * @exception IOException If the input or output stream accesses failed.
097:             * @exception Base64FormatException If the input stream is not compliant
098:             *    with the BASE64 specification.
099:             */
100:            public void process() throws IOException, Base64FormatException {
101:                byte buffer[] = new byte[BUFFER_SIZE];
102:                byte chunk[] = new byte[4];
103:                int got = -1;
104:                int ready = 0;
105:
106:                fill: while ((got = in.read(buffer)) > 0) {
107:                    int skiped = 0;
108:                    while (skiped < got) {
109:                        // Check for un-understood characters:
110:                        while (ready < 4) {
111:                            if (skiped >= got)
112:                                continue fill;
113:                            int ch = check(buffer[skiped++]);
114:                            if (ch >= 0)
115:                                chunk[ready++] = (byte) ch;
116:                        }
117:                        if (chunk[2] == 65) {
118:                            out.write(get1(chunk, 0));
119:                            return;
120:                        } else if (chunk[3] == 65) {
121:                            out.write(get1(chunk, 0));
122:                            out.write(get2(chunk, 0));
123:                            return;
124:                        } else {
125:                            out.write(get1(chunk, 0));
126:                            out.write(get2(chunk, 0));
127:                            out.write(get3(chunk, 0));
128:                        }
129:                        ready = 0;
130:                    }
131:                }
132:                if (ready != 0)
133:                    throw new Base64FormatException("Invalid length.");
134:                out.flush();
135:            }
136:
137:            /**
138:             * Do the decoding, and return a String.
139:             * This methods should be called when the decoder is used in
140:             * <em>String</em> mode. It decodes the input string to an output string
141:             * that is returned.
142:             * @exception RuntimeException If the object wasn't constructed to
143:             *    decode a String.
144:             * @exception Base64FormatException If the input string is not compliant 
145:             *     with the BASE64 specification.
146:             */
147:            public String processString() throws Base64FormatException {
148:                if (!stringp)
149:                    throw new RuntimeException(this .getClass().getName()
150:                            + "[processString]" + "invalid call (not a String)");
151:                try {
152:                    process();
153:                } catch (IOException e) {
154:                }
155:                String s;
156:                try {
157:                    s = ((ByteArrayOutputStream) out).toString("ISO-8859-1");
158:                } catch (UnsupportedEncodingException ex) {
159:                    throw new RuntimeException(this .getClass().getName()
160:                            + "[processString] Unable to convert"
161:                            + "properly char to bytes");
162:                }
163:                return s;
164:            }
165:
166:            /**
167:             * Create a decoder to decode a String.
168:             * @param input The string to be decoded.
169:             */
170:            public Base64Decoder(String input) {
171:                byte bytes[];
172:                try {
173:                    bytes = input.getBytes("ISO-8859-1");
174:                } catch (UnsupportedEncodingException ex) {
175:                    throw new RuntimeException(this .getClass().getName()
176:                            + "[Constructor] Unable to convert"
177:                            + "properly char to bytes");
178:                }
179:                this .stringp = true;
180:                this .in = new ByteArrayInputStream(bytes);
181:                this .out = new ByteArrayOutputStream();
182:            }
183:
184:            /**
185:             * Create a decoder to decode a stream.
186:             * @param in The input stream (to be decoded).
187:             * @param out The output stream, to write decoded data to.
188:             */
189:            public Base64Decoder(InputStream in, OutputStream out) {
190:                this .in = in;
191:                this .out = out;
192:                this .stringp = false;
193:            }
194:
195:            /**
196:             * Test the decoder.
197:             * Run it with one argument: the string to be decoded, it will print out
198:             * the decoded value.
199:             */
200:            public static void main(String args[]) {
201:                if (args.length == 1) {
202:                    try {
203:                        Base64Decoder b = new Base64Decoder(args[0]);
204:                        System.out.println("[" + b.processString() + "]");
205:                    } catch (Base64FormatException e) {
206:                        System.out.println("Invalid Base64 format !");
207:                        System.exit(1);
208:                    }
209:                } else if ((args.length == 2) && (args[0].equals("-f"))) {
210:                    try {
211:                        FileInputStream in = new FileInputStream(args[1]);
212:                        Base64Decoder b = new Base64Decoder(in, System.out);
213:                        b.process();
214:                    } catch (Exception ex) {
215:                        System.out.println("error: " + ex.getMessage());
216:                        System.exit(1);
217:                    }
218:                } else {
219:                    System.out.println("Base64Decoder [strong] [-f file]");
220:                }
221:                System.exit(0);
222:            }
223:        }
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