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Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEncodingHelper.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEncodingHelper.java | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEncodingHelper.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEncodingHelper.java new file mode 100644 index 00000000..4d3dab95 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEncodingHelper.java @@ -0,0 +1,252 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +package org.apache.tools.zip; + +import java.nio.ByteBuffer; +import java.nio.charset.Charset; +import java.nio.charset.UnsupportedCharsetException; +import java.util.Collections; +import java.util.HashMap; +import java.util.Map; + +/** + * Static helper functions for robustly encoding filenames in zip files. + */ +public abstract class ZipEncodingHelper { + + /** + * A class, which holds the high characters of a simple encoding + * and lazily instantiates a Simple8BitZipEncoding instance in a + * thread-safe manner. + */ + private static class SimpleEncodingHolder { + + private final char [] highChars; + private Simple8BitZipEncoding encoding; + + /** + * Instantiate a simple encoding holder. + * + * @param highChars The characters for byte codes 128 to 255. + * + * @see Simple8BitZipEncoding#Simple8BitZipEncoding(char[]) + */ + SimpleEncodingHolder(final char [] highChars) { + this.highChars = highChars; + } + + /** + * @return The associated {@link Simple8BitZipEncoding}, which + * is instantiated if not done so far. + */ + public synchronized Simple8BitZipEncoding getEncoding() { + if (this.encoding == null) { + this.encoding = new Simple8BitZipEncoding(this.highChars); + } + return this.encoding; + } + } + + private static final Map<String, SimpleEncodingHolder> simpleEncodings; + + static { + final Map<String, SimpleEncodingHolder> se = + new HashMap<String, SimpleEncodingHolder>(); + + final char[] cp437_high_chars = + new char[] {0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, + 0x00e5, 0x00e7, 0x00ea, 0x00eb, 0x00e8, 0x00ef, + 0x00ee, 0x00ec, 0x00c4, 0x00c5, 0x00c9, 0x00e6, + 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9, + 0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, + 0x20a7, 0x0192, 0x00e1, 0x00ed, 0x00f3, 0x00fa, + 0x00f1, 0x00d1, 0x00aa, 0x00ba, 0x00bf, 0x2310, + 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb, + 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, + 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, + 0x255d, 0x255c, 0x255b, 0x2510, 0x2514, 0x2534, + 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f, + 0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, + 0x256c, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559, + 0x2558, 0x2552, 0x2553, 0x256b, 0x256a, 0x2518, + 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580, + 0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, + 0x00b5, 0x03c4, 0x03a6, 0x0398, 0x03a9, 0x03b4, + 0x221e, 0x03c6, 0x03b5, 0x2229, 0x2261, 0x00b1, + 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248, + 0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, + 0x25a0, 0x00a0}; + + final SimpleEncodingHolder cp437 = new SimpleEncodingHolder(cp437_high_chars); + + se.put("CP437", cp437); + se.put("Cp437", cp437); + se.put("cp437", cp437); + se.put("IBM437", cp437); + se.put("ibm437", cp437); + + final char[] cp850_high_chars = + new char[] {0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, + 0x00e5, 0x00e7, 0x00ea, 0x00eb, 0x00e8, 0x00ef, + 0x00ee, 0x00ec, 0x00c4, 0x00c5, 0x00c9, 0x00e6, + 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9, + 0x00ff, 0x00d6, 0x00dc, 0x00f8, 0x00a3, 0x00d8, + 0x00d7, 0x0192, 0x00e1, 0x00ed, 0x00f3, 0x00fa, + 0x00f1, 0x00d1, 0x00aa, 0x00ba, 0x00bf, 0x00ae, + 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb, + 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x00c1, + 0x00c2, 0x00c0, 0x00a9, 0x2563, 0x2551, 0x2557, + 0x255d, 0x00a2, 0x00a5, 0x2510, 0x2514, 0x2534, + 0x252c, 0x251c, 0x2500, 0x253c, 0x00e3, 0x00c3, + 0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, + 0x256c, 0x00a4, 0x00f0, 0x00d0, 0x00ca, 0x00cb, + 0x00c8, 0x0131, 0x00cd, 0x00ce, 0x00cf, 0x2518, + 0x250c, 0x2588, 0x2584, 0x00a6, 0x00cc, 0x2580, + 0x00d3, 0x00df, 0x00d4, 0x00d2, 0x00f5, 0x00d5, + 0x00b5, 0x00fe, 0x00de, 0x00da, 0x00db, 0x00d9, + 0x00fd, 0x00dd, 0x00af, 0x00b4, 0x00ad, 0x00b1, + 0x2017, 0x00be, 0x00b6, 0x00a7, 0x00f7, 0x00b8, + 0x00b0, 0x00a8, 0x00b7, 0x00b9, 0x00b3, 0x00b2, + 0x25a0, 0x00a0}; + + final SimpleEncodingHolder cp850 = new SimpleEncodingHolder(cp850_high_chars); + + se.put("CP850", cp850); + se.put("Cp850", cp850); + se.put("cp850", cp850); + se.put("IBM850", cp850); + se.put("ibm850", cp850); + simpleEncodings = Collections.unmodifiableMap(se); + } + + /** + * Grow a byte buffer, so it has a minimal capacity or at least + * the double capacity of the original buffer + * + * @param b The original buffer. + * @param newCapacity The minimal requested new capacity. + * @return A byte buffer <code>r</code> with + * <code>r.capacity() = max(b.capacity()*2,newCapacity)</code> and + * all the data contained in <code>b</code> copied to the beginning + * of <code>r</code>. + * + */ + static ByteBuffer growBuffer(final ByteBuffer b, final int newCapacity) { + b.limit(b.position()); + b.rewind(); + + final int c2 = b.capacity() * 2; + final ByteBuffer on = ByteBuffer.allocate(c2 < newCapacity ? newCapacity : c2); + + on.put(b); + return on; + } + + + /** + * The hexadecimal digits <code>0,...,9,A,...,F</code> encoded as + * ASCII bytes. + */ + private static final byte[] HEX_DIGITS = + new byte [] { + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, + 0x42, 0x43, 0x44, 0x45, 0x46 + }; + + /** + * Append <code>%Uxxxx</code> to the given byte buffer. + * The caller must assure, that <code>bb.remaining()>=6</code>. + * + * @param bb The byte buffer to write to. + * @param c The character to write. + */ + static void appendSurrogate(final ByteBuffer bb, final char c) { + + bb.put((byte) '%'); + bb.put((byte) 'U'); + + bb.put(HEX_DIGITS[(c >> 12)&0x0f]); + bb.put(HEX_DIGITS[(c >> 8)&0x0f]); + bb.put(HEX_DIGITS[(c >> 4)&0x0f]); + bb.put(HEX_DIGITS[c & 0x0f]); + } + + + /** + * name of the encoding UTF-8 + */ + static final String UTF8 = "UTF8"; + + /** + * variant name of the encoding UTF-8 used for comparisons. + */ + private static final String UTF_DASH_8 = "utf-8"; + + /** + * name of the encoding UTF-8 + */ + static final ZipEncoding UTF8_ZIP_ENCODING = new FallbackZipEncoding(UTF8); + + /** + * Instantiates a zip encoding. + * + * @param name The name of the zip encoding. Specify {@code null} for + * the platform's default encoding. + * @return A zip encoding for the given encoding name. + */ + public static ZipEncoding getZipEncoding(final String name) { + + // fallback encoding is good enough for utf-8. + if (isUTF8(name)) { + return UTF8_ZIP_ENCODING; + } + + if (name == null) { + return new FallbackZipEncoding(); + } + + final SimpleEncodingHolder h = simpleEncodings.get(name); + + if (h!=null) { + return h.getEncoding(); + } + + try { + + final Charset cs = Charset.forName(name); + return new NioZipEncoding(cs); + + } catch (final UnsupportedCharsetException e) { + return new FallbackZipEncoding(name); + } + } + + /** + * Whether a given encoding - or the platform's default encoding + * if the parameter is null - is UTF-8. + */ + static boolean isUTF8(String encoding) { + if (encoding == null) { + // check platform's default encoding + encoding = System.getProperty("file.encoding"); + } + return UTF8.equalsIgnoreCase(encoding) + || UTF_DASH_8.equalsIgnoreCase(encoding); + } +} |