Source Code Cross Referenced for FileSystemAbstract.java in  » 6.0-JDK-Modules » j2me » com » sun » satsa » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 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:        package com.sun.satsa.util;
028:
029:        import java.io.IOException;
030:
031:        /**
032:         * This class provides interface to card file system.
033:         */
034:        abstract public class FileSystemAbstract {
035:
036:            /** Expected maximum path depth. */
037:            static final int MAX_PATH_DEPTH = 10;
038:            /** APDU INS byte. */
039:            protected static final byte INS_SELECT = (byte) 0xa4;
040:            /** APDU INS byte. */
041:            protected static final byte INS_READ = (byte) 0xb0;
042:            /** APDU INS byte. */
043:            protected static final byte INS_UPDATE = (byte) 0xd6;
044:            /** Root path for this application. */
045:            short[] root;
046:            /** The length of path to current DF. */
047:            int pathLength;
048:            /**
049:             * Path to the current DF. Element at index pathLength contains EF
050:             * identifier if EF is selected.
051:             */
052:            short[] currentPath;
053:            /** Connection used by this file system. */
054:            protected Connection apdu;
055:            /** Size of currently selected EF or -1 if DF is selected. */
056:            protected int currentFileSize;
057:            /** True if currently selected file is EF. */
058:            protected boolean isEFSelected;
059:
060:            /**
061:             * Constructs new FileSystem object.
062:             * @param apdu connection to be used by this object.
063:             */
064:            public FileSystemAbstract(Connection apdu) {
065:                this .apdu = apdu;
066:            }
067:
068:            /**
069:             * Sets the root directory for this file system.
070:             * @param root root directory path
071:             */
072:            public void setRoot(short[] root) {
073:
074:                this .root = root;
075:                currentPath = new short[MAX_PATH_DEPTH];
076:
077:                for (int j = 0; j < root.length; j++) {
078:                    currentPath[j] = root[j];
079:                }
080:                pathLength = root.length;
081:            }
082:
083:            /**
084:             * Sends the select DF command to the card.
085:             * @param root short[] directory path
086:             * @throws IOException if IO error occurs
087:             */
088:            public void selectRoot(short[] root) throws IOException {
089:                setRoot(root);
090:                for (int i = 0; i < root.length; i++) {
091:                    byte[] data = apdu.resetCommand().putShort(root[i])
092:                            .sendCommand(INS_SELECT, 0x0100);
093:                }
094:            }
095:
096:            /**
097:             * If necessary converts path into completely specified path.
098:             * @param t TLV object that contains octet string representing path
099:             * @return completely specified path
100:             * @throws IOException if path is incorrect
101:             */
102:            public short[] makePath(TLV t) throws IOException {
103:
104:                short[] path;
105:                short s = Utils.getShort(t.data, t.valueOffset);
106:                if (root == null) { // only file IDs are used
107:                    if (t.length == 2) {
108:                        path = new short[1];
109:                        path[0] = s;
110:                        return path;
111:                    }
112:                    throw new IOException("Invalid path - ID expected");
113:                }
114:
115:                // absolute path
116:                if (s == 0x3f00) {
117:                    path = new short[t.length / 2];
118:                    for (int i = 0; i < path.length; i++) {
119:                        path[i] = Utils.getShort(t.data, t.valueOffset + i * 2);
120:                    }
121:                    return path;
122:                }
123:
124:                // it must be relative path
125:                int len = root.length + t.length / 2;
126:                int offset = t.valueOffset;
127:
128:                if (s == 0x3fff) {
129:                    len--;
130:                    offset += 2;
131:                } else {
132:                    if (t.length != 2) {
133:                        throw new IOException(
134:                                "Invalid path - file ID must be used");
135:                    }
136:                }
137:
138:                path = new short[len];
139:                System.arraycopy(root, 0, path, 0, root.length);
140:                for (int i = root.length; i < path.length; i++) {
141:                    path[i] = Utils.getShort(t.data, offset);
142:                    offset += 2;
143:                }
144:                return path;
145:            }
146:
147:            /**
148:             * Selects file using only SELECT APDU command with file identifier.
149:             * According to WIM specification support of this selection method
150:             * is mandatory.
151:             * @param path file path
152:             * @throws IOException if IO error occurs
153:             */
154:            public void select(short[] path) throws IOException {
155:
156:                if (root == null) {
157:                    if (path.length == 1) {
158:                        select(path[0]);
159:                        return;
160:                    }
161:                    throw new IOException("Invalid path - file ID must be used");
162:                }
163:
164:                int c = 0; // index of first path element that differs
165:                while (c < pathLength && c < path.length) {
166:                    if (currentPath[c] != path[c]) {
167:                        break;
168:                    }
169:                    c++;
170:                }
171:
172:                if (c == 0) {
173:                    throw new IOException("Invalid path - wrong root directory");
174:                }
175:
176:                if (c == pathLength && pathLength == (path.length - 1)
177:                        && isEFSelected
178:                        && currentPath[pathLength] == path[pathLength]) {
179:                    return;
180:                }
181:
182:                while (c < pathLength) {
183:                    pathLength--;
184:                    select(currentPath[pathLength]);
185:                }
186:
187:                while (pathLength < path.length) {
188:                    select(path[pathLength]);
189:                    currentPath[pathLength] = path[pathLength];
190:                    if (isEFSelected) {
191:                        if (pathLength == path.length - 1) {
192:                            break;
193:                        }
194:                        throw new IOException("Invalid path - EF in path");
195:                    }
196:                    pathLength++;
197:                }
198:            }
199:
200:            /**
201:             * Selects file by ID.
202:             * @param id file ID
203:             * @throws IOException if IOError occurs
204:             */
205:            abstract public void select(short id) throws IOException;
206:
207:            /**
208:             * Reads the current EF.
209:             * @return array that contains EF body.
210:             * @throws IOException if IO error occurs
211:             */
212:            public byte[] readFile() throws IOException {
213:                byte[] data = readData(0, currentFileSize, 0);
214:                return data;
215:            }
216:
217:            /**
218:             * Reads part of selected file.
219:             * @param offset the offset into data buffer where data should be
220:             * placed
221:             * @param length data length
222:             * @param fileOffset file data offset
223:             * @throws IOException if IO error occurs
224:             * @return data byte array of the data
225:             */
226:            abstract public byte[] readData(int offset, int length,
227:                    int fileOffset) throws IOException;
228:
229:            /**
230:             * Loads and parses one DER encoded object.
231:             * @param l location of the object.
232:             * @return the object.
233:             * @throws IOException if I/O error occurs
234:             * @throws TLVException if parsing error occurs
235:             */
236:            public TLV loadObject(Location l) throws IOException, TLVException {
237:                select(l.path);
238:                byte[] tmp = readData(0, l.length, l.offset);
239:                return new TLV(tmp, 0);
240:            }
241:
242:            /**
243:             * Converts PKCS#15 path into location.
244:             * @param path TLV structure that represents path
245:             * @return Location object
246:             */
247:            public Location pathToLocation(TLV path) throws IOException {
248:
249:                try {
250:                    if (path.type == TLV.SEQUENCE_TYPE) {
251:                        path = path.child;
252:                    }
253:
254:                    short[] p = makePath(path);
255:                    int offset = 0;
256:                    int length = -1;
257:
258:                    if (path.next != null) {
259:                        offset = path.next.getInteger();
260:                        length = path.next.next.getInteger();
261:                    }
262:                    return new Location(p, offset, length);
263:                } catch (IOException e) {
264:                    throw new IOException("Invalid path structure");
265:                } catch (NullPointerException npe) {
266:                    throw new IOException("Invalid path structure");
267:                } catch (IndexOutOfBoundsException iobe) {
268:                    throw new IOException("Invalid path structure");
269:                }
270:            }
271:
272:            /**
273:             * Returns the size of currently selected EF or -1 if DF is
274:             * selected.
275:             * @return file size
276:             */
277:            public int getCurrrentFileSize() {
278:                return currentFileSize;
279:            }
280:        }
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