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package org.yaml.snakeyaml.reader; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.InputStreamReader; |
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import java.io.PushbackInputStream; |
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import java.io.Reader; |
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import java.nio.charset.Charset; |
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import java.nio.charset.CharsetDecoder; |
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import java.nio.charset.CodingErrorAction; |
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public class UnicodeReader extends Reader { |
54 | 1 | private static final Charset UTF8 = Charset.forName("UTF-8"); |
55 | 1 | private static final Charset UTF16BE = Charset.forName("UTF-16BE"); |
56 | 1 | private static final Charset UTF16LE = Charset.forName("UTF-16LE"); |
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PushbackInputStream internalIn; |
59 | 1355 | InputStreamReader internalIn2 = null; |
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private static final int BOM_SIZE = 3; |
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67 | 1355 | public UnicodeReader(InputStream in) { |
68 | 1355 | internalIn = new PushbackInputStream(in, BOM_SIZE); |
69 | 1355 | } |
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public String getEncoding() { |
76 | 4 | return internalIn2.getEncoding(); |
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} |
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protected void init() throws IOException { |
84 | 2685 | if (internalIn2 != null) |
85 | 1330 | return; |
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Charset encoding; |
88 | 1355 | byte bom[] = new byte[BOM_SIZE]; |
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int n, unread; |
90 | 1355 | n = internalIn.read(bom, 0, bom.length); |
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92 | 1354 | if ((bom[0] == (byte) 0xEF) && (bom[1] == (byte) 0xBB) && (bom[2] == (byte) 0xBF)) { |
93 | 2 | encoding = UTF8; |
94 | 2 | unread = n - 3; |
95 | 1352 | } else if ((bom[0] == (byte) 0xFE) && (bom[1] == (byte) 0xFF)) { |
96 | 2 | encoding = UTF16BE; |
97 | 2 | unread = n - 2; |
98 | 1350 | } else if ((bom[0] == (byte) 0xFF) && (bom[1] == (byte) 0xFE)) { |
99 | 1 | encoding = UTF16LE; |
100 | 1 | unread = n - 2; |
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} else { |
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103 | 1349 | encoding = UTF8; |
104 | 1349 | unread = n; |
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} |
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107 | 1354 | if (unread > 0) |
108 | 1347 | internalIn.unread(bom, (n - unread), unread); |
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111 | 1354 | CharsetDecoder decoder = encoding.newDecoder().onUnmappableCharacter( |
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CodingErrorAction.REPORT); |
113 | 1354 | internalIn2 = new InputStreamReader(internalIn, decoder); |
114 | 1354 | } |
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public void close() throws IOException { |
117 | 1 | init(); |
118 | 1 | internalIn2.close(); |
119 | 1 | } |
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public int read(char[] cbuf, int off, int len) throws IOException { |
122 | 2684 | init(); |
123 | 2683 | return internalIn2.read(cbuf, off, len); |
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} |
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} |