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1
4
5 package com.etymon.pjx;
6
7 import java.io.*;
8 import java.nio.*;
9
10
14 public class PdfString
15 extends PdfObject {
16
17
20 protected String  _s;
21
22
26 public PdfString(String s) {
27 _s = s;
28 }
29
30 public boolean equals(Object obj) {
31
32 if ( (obj == null) || ( !(obj instanceof PdfString) ) ) {
33 return false;
34 }
35
36 return _s.equals( ((PdfString)obj)._s );
37 }
38
39
43 public String getString() {
44 return _s;
45 }
46
47 public int hashCode() {
48 return _s.hashCode();
49 }
50
51
57 protected static boolean isWhiteSpace(char ch) {
58 switch(ch) {
59 case 0:
60 case '\t':
61 case '\n':
62 case '\f':
63 case '\r':
64 case ' ':
65 return true;
66 default:
67 return false;
68 }
69 }
70
71
76 protected static String pdfToString(CharBuffer buf) throws PdfFormatException {
77
78 try {
79
80 char ch;
82 do {
83 ch = buf.get();
84 } while (isWhiteSpace(ch));
85
87 if (ch == '(') {
88 return decodeLiteralString(buf);
89 }
90 else if (ch == '<') {
91 return decodeHexString(buf);
92 }
93 else {
94 throw new PdfFormatException("'(' or '<' expected at beginning of string.");
95 }
96
97 }
98 catch (BufferUnderflowException e) {
99 throw new PdfFormatException("End of buffer reached while parsing string.");
100 }
101
102 }
103
104 protected static String decodeLiteralString(CharBuffer buf)
105 throws BufferUnderflowException, PdfFormatException {
106
107 char ch, chc, che;
108 boolean append;
109 boolean escaping = false;
110 int paren = 0; StringBuffer sb = new StringBuffer ();
112 char[] code = new char[3];
113 int codeLen;
114 boolean done = false;
115
116 do {
117
118 ch = buf.get();
119
120 append = true;
121
122 che = ch;
123
124 if (escaping) {
125
126 escaping = false;
127
128 switch (ch) {
129 case 'n':
130 che = '\n';
131 break;
132 case 'r':
133 che = '\r';
134 break;
135 case 't':
136 che = '\t';
137 break;
138 case 'b':
139 che = '\b';
140 break;
141 case 'f':
142 che = '\f';
143 break;
144 case '(':
145 che = '(';
146 break;
147 case ')':
148 che = ')';
149 break;
150 case '\\':
151 che = '\\';
152 break;
153 case '0':
154 case '1':
155 case '2':
156 case '3':
157 case '4':
158 case '5':
159 case '6':
160 case '7':
161 case '8':
162 case '9':
163 append = false;
164 code[0] = ch;
165 codeLen = 1;
166 boolean code_done = false;
167 do {
168 chc = buf.get();
169 switch (chc) {
170 case '0':
171 case '1':
172 case '2':
173 case '3':
174 case '4':
175 case '5':
176 case '6':
177 case '7':
178 case '8':
179 if (codeLen < 3) {
180 code[codeLen++] = chc;
181 break;
182 }
183 default:
184 code_done = true;
185 buf.position( buf.position() - 1 );
186 }
187 } while (!code_done);
188 sb.append( (char)Integer.parseInt(new String (code, 0, codeLen), 8) );
189 break;
190 case '\r':
191 case '\n':
192 append = false;
193 do {
194 chc = buf.get();
195 } while ( (chc == '\r') || (chc == '\n') );
196 buf.position ( buf.position() - 1 );
197 break;
198 default:
199 }
200
201 } else {
202
203 switch (ch) {
204 case '(':
205 paren++;
206 break;
207 case ')':
208 if (paren > 0) {
209 paren--;
210 } else {
211 append = false;
212 done = true;
213 }
214 break;
215 case '\\':
216 escaping = true;
217 append = false;
218 break;
219 case '\r':
220 if (buf.get() != '\n') {
221 buf.position( buf.position() - 1 );
222 }
223 che = '\n';
224 break;
225 default:
226 }
227
228 }
230 if (append) {
231 sb.append(che);
232 }
233
234 } while (!done);
235
236 return sb.toString();
237
238 }
239
240 protected static String decodeHexString(CharBuffer buf)
241 throws BufferUnderflowException, PdfFormatException {
242
243 char ch;
244 boolean done = false;
245 StringBuffer sb = new StringBuffer ();
246 char[] hex = new char[2];
247 int hexLen = 0;
248
249 do {
250
251 ch = buf.get();
252
253 switch (ch) {
254 case '0':
255 case '1':
256 case '2':
257 case '3':
258 case '4':
259 case '5':
260 case '6':
261 case '7':
262 case '8':
263 case '9':
264 case 'A':
265 case 'B':
266 case 'C':
267 case 'D':
268 case 'E':
269 case 'F':
270 case 'a':
271 case 'b':
272 case 'c':
273 case 'd':
274 case 'e':
275 case 'f':
276 hex[hexLen] = ch;
277 hexLen++;
278 break;
279 case '>':
280 done = true;
281 case 0:
282 case '\t':
283 case '\n':
284 case '\f':
285 case '\r':
286 case ' ':
287 break;
288 default:
289 throw new PdfFormatException("Unrecognized character in hexadecimal string.");
290 }
291
292 if ( (done) && (hexLen == 1) ) {
293 hex[1] = '0';
294 hexLen = 2;
295 }
296
297 if (hexLen >= 2) {
298 sb.append( (char)Integer.parseInt(new String (hex), 16) );
299 hexLen = 0;
300 }
301
302 } while (!done);
303
304 return sb.toString();
305
306 }
307
308 protected int writePdf(PdfWriter w, boolean spacing) throws IOException {
309
310 DataOutputStream dos = w.getDataOutputStream();
311
312 int count = 1;
313 dos.write('(');
314
315 String s = _s;
316 int len = s.length();
317
318 for (int x = 0; x < len; x++) {
319
320 char ch = s.charAt(x);
321
322 switch (ch) {
323 case '(':
324 dos.writeBytes("\\(");
325 count += 2;
326 break;
327 case ')':
328 dos.writeBytes("\\)");
329 count += 2;
330 break;
331 case '\\':
332 dos.writeBytes("\\\\");
333 count += 2;
334 break;
335 case '\r':
336 dos.writeBytes("\\r");
337 count += 2;
338 break;
339 case '\n':
340 dos.writeBytes("\\n");
341 count += 2;
342 break;
343 default:
344 dos.write(ch);
345 count++;
346 }
347
348 }
350 dos.write(')');
351 return count + 1;
352
353 }
354
355 }
356 |
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