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1
28
29 package com.caucho.xml.readers;
30
31 import com.caucho.util.CharBuffer;
32 import com.caucho.vfs.ReadStream;
33 import com.caucho.xml.XmlParser;
34
35 import java.io.CharConversionException  ;
36 import java.io.EOFException ;
37 import java.io.IOException ;
38
39
42 public class Utf8Reader extends XmlReader {
43
46 public Utf8Reader()
47 {
48 }
49
50
53 public Utf8Reader(XmlParser parser, ReadStream is)
54 {
55 super(parser, is);
56 }
57
58
61 public int read()
62 throws IOException
63 {
64 int ch1 = _is.read();
65
66 if (ch1 == '\n') {
67 _parser.setLine(++_line);
68 return ch1;
69 }
70 else if (ch1 == '\r') {
71 _parser.setLine(++_line);
72
73 int ch2 = _is.read();
74 if (ch2 == '\n')
75 return '\n';
76
77 if (ch2 < 0) {
78 }
79 else if (ch2 < 0x80)
80 _parser.unread(ch2);
81 else
82 _parser.unread(readSecond(ch2));
83
84 return '\n';
85 }
86 else if (ch1 < 0x80)
87 return ch1;
88 else
89 return readSecond(ch1);
90 }
91
92 private int readSecond(int ch1)
93 throws IOException
94 {
95 if ((ch1 & 0xe0) == 0xc0) {
96 int ch2 = _is.read();
97 if (ch2 < 0)
98 throw new EOFException ("unexpected end of file in utf8 character");
99 else if ((ch2 & 0xc0) != 0x80)
100 throw error(L.l("illegal utf8 encoding {0}", hex(ch1)));
101
102 return ((ch1 & 0x1f) << 6) + (ch2 & 0x3f);
103 }
104 else if ((ch1 & 0xf0) == 0xe0) {
105 int ch2 = _is.read();
106 int ch3 = _is.read();
107
108 if (ch2 < 0)
109 throw new EOFException ("unexpected end of file in utf8 character");
110 else if ((ch2 & 0xc0) != 0x80)
111 throw error(L.l("illegal utf8 encoding at {0} {1} {2}", hex(ch1), hex(ch2), hex(ch3)));
112
113 if (ch3 < 0)
114 throw new EOFException ("unexpected end of file in utf8 character");
115 else if ((ch3 & 0xc0) != 0x80)
116 throw error(L.l("illegal utf8 encoding {0} {1} {2}",
117 hex(ch1), hex(ch2), hex(ch3)));
118
119 int ch = ((ch1 & 0x1f) << 12) + ((ch2 & 0x3f) << 6) + (ch3 & 0x3f);
120
121 if (ch == 0xfeff) return read();
123 else
124 return ch;
125 }
126 else
127 throw error(L.l("illegal utf8 encoding at {0}", hex(ch1)));
128 }
129
130 private String hex(int n)
131 {
132 n = n & 0xff;
133
134 CharBuffer cb = CharBuffer.allocate();
135
136 cb.append("0x");
137
138 int d = n / 16;
139 if (d >= 0 && d <= 9)
140 cb.append((char) ('0' + d));
141 else
142 cb.append((char) ('a' + d - 10));
143
144 d = n % 16;
145 if (d >= 0 && d <= 9)
146 cb.append((char) ('0' + d));
147 else
148 cb.append((char) ('a' + d - 10));
149
150 return cb.close();
151 }
152
153 private CharConversionException error(String msg)
154 {
155 String filename = _parser.getFilename();
156 int line = _parser.getLine();
157
158 if (filename != null)
159 return new CharConversionException (filename + ":" + line + ": " + msg);
160 else
161 return new CharConversionException (msg);
162 }
163 }
164
165 |
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