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1
57
58
59 package org.enhydra.apache.xml.serialize;
60
61 import java.io.ByteArrayOutputStream  ;
62 import java.io.IOException ;
63 import java.io.OutputStreamWriter ;
64 import java.io.Writer ;
65
66
71 public class SieveEncodingInfo extends EncodingInfo {
72
73 BAOutputStream checkerStream = null;
74 Writer checkerWriter = null;
75 String dangerChars = null;
76
77
82 public SieveEncodingInfo(String mimeName, String javaName,
83 int lastPrintable, String dangers) {
84 super(mimeName, javaName, lastPrintable);
85 this.dangerChars = dangers;
86 }
87
88
91 public SieveEncodingInfo(String mimeName, int lastPrintable) {
92 this(mimeName, mimeName, lastPrintable, null);
93 }
94
95
100 public boolean isPrintable(int ch) {
101 if (this.dangerChars != null && ch <= 0xffff) {
102
106 if (this.dangerChars.indexOf(ch) >= 0)
107 return false;
108 }
109
110 if (ch <= this.lastPrintable)
111 return true;
112
113 boolean printable = true;
114 synchronized (this) {
115 try {
116 if (this.checkerWriter == null) {
117 this.checkerStream = new BAOutputStream(10);
118 this.checkerWriter = new OutputStreamWriter (this.checkerStream, this.javaName);
119 }
120
121 if (ch > 0xffff) {
122 this.checkerWriter.write(((ch-0x10000)>>10)+0xd800);
123 this.checkerWriter.write(((ch-0x10000)&0x3ff)+0xdc00);
124 byte[] result = this.checkerStream.getBuffer();
125 if (this.checkerStream.size() == 2 && result[0] == '?' && result[1] == '?')
126 printable = false;
127 } else {
128 this.checkerWriter.write(ch);
129 this.checkerWriter.flush();
130 byte[] result = this.checkerStream.getBuffer();
131 if (this.checkerStream.size() == 1 && result[0] == '?')
132 printable = false;
133 }
134 this.checkerStream.reset();
135 } catch (IOException ioe) {
136 printable = false;
137 }
138 }
139
140 return printable;
141 }
142
143
148 static class BAOutputStream extends ByteArrayOutputStream {
149 BAOutputStream() {
150 super();
151 }
152
153 BAOutputStream(int size) {
154 super(size);
155 }
156
157 byte[] getBuffer() {
158 return this.buf;
159 }
160 }
161
162 }
163 |
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