com.zving.preloader.zip.ZipEncodingHelper Maven / Gradle / Ivy

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package com.zving.preloader.zip;

import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.UnsupportedCharsetException;
import java.util.HashMap;
import java.util.Map;

abstract class ZipEncodingHelper
{
  private static class SimpleEncodingHolder
  {
    private final char[] highChars;
    private Simple8BitZipEncoding encoding;
    
    SimpleEncodingHolder(char[] highChars)
    {
      this.highChars = highChars;
    }
    
    public synchronized Simple8BitZipEncoding getEncoding()
    {
      if (this.encoding == null) {
        this.encoding = new Simple8BitZipEncoding(this.highChars);
      }
      return this.encoding;
    }
  }
  
  private static final Map simpleEncodings = new HashMap();
  
  static
  {
    char[] cp437_high_chars = { 'Ç', 'ü', 'é', 'â', 'ä', 'à', 'å', 'ç', 'ê', 'ë', 'è', 
      'ï', 'î', 'ì', 'Ä', 'Å', 'É', 'æ', 'Æ', 'ô', 'ö', 'ò', 'û', 'ù', 'ÿ', 'Ö', 
      'Ü', '¢', '£', '¥', '₧', 'ƒ', 'á', 'í', 'ó', 'ú', 'ñ', 'Ñ', 'ª', 'º', '¿', 
      '⌐', '¬', '½', '¼', '¡', '«', '»', '░', '▒', '▓', '│', '┤', '╡', '╢', '╖', 
      '╕', '╣', '║', '╗', '╝', '╜', '╛', '┐', '└', '┴', '┬', '├', '─', '┼', '╞', 
      '╟', '╚', '╔', '╩', '╦', '╠', '═', '╬', '╧', '╨', '╤', '╥', '╙', '╘', '╒', 
      '╓', '╫', '╪', '┘', '┌', '█', '▄', '▌', '▐', '▀', 'α', 'ß', 'Γ', 'π', 'Σ', 
      'σ', 'µ', 'τ', 'Φ', 'Θ', 'Ω', 'δ', '∞', 'φ', 'ε', '∩', '≡', '±', '≥', '≤', 
      '⌠', '⌡', '÷', '≈', '°', '∙', '·', '√', 'ⁿ', '²', '■', ' ' };
    
    SimpleEncodingHolder cp437 = new SimpleEncodingHolder(cp437_high_chars);
    
    simpleEncodings.put("CP437", cp437);
    simpleEncodings.put("Cp437", cp437);
    simpleEncodings.put("cp437", cp437);
    simpleEncodings.put("IBM437", cp437);
    simpleEncodings.put("ibm437", cp437);
    
    char[] cp850_high_chars = { 'Ç', 'ü', 'é', 'â', 'ä', 'à', 'å', 'ç', 'ê', 'ë', 'è', 
      'ï', 'î', 'ì', 'Ä', 'Å', 'É', 'æ', 'Æ', 'ô', 'ö', 'ò', 'û', 'ù', 'ÿ', 'Ö', 
      'Ü', 'ø', '£', 'Ø', '×', 'ƒ', 'á', 'í', 'ó', 'ú', 'ñ', 'Ñ', 'ª', 'º', '¿', 
      '®', '¬', '½', '¼', '¡', '«', '»', '░', '▒', '▓', '│', '┤', 'Á', 'Â', 'À', 
      '©', '╣', '║', '╗', '╝', '¢', '¥', '┐', '└', '┴', '┬', '├', '─', '┼', 'ã', 
      'Ã', '╚', '╔', '╩', '╦', '╠', '═', '╬', '¤', 'ð', 'Ð', 'Ê', 'Ë', 'È', 'ı', 
      'Í', 'Î', 'Ï', '┘', '┌', '█', '▄', '¦', 'Ì', '▀', 'Ó', 'ß', 'Ô', 'Ò', 'õ', 
      'Õ', 'µ', 'þ', 'Þ', 'Ú', 'Û', 'Ù', 'ý', 'Ý', '¯', '´', '', '±', '‗', '¾', 
      '¶', '§', '÷', '¸', '°', '¨', '·', '¹', '³', '²', '■', ' ' };
    
    SimpleEncodingHolder cp850 = new SimpleEncodingHolder(cp850_high_chars);
    
    simpleEncodings.put("CP850", cp850);
    simpleEncodings.put("Cp850", cp850);
    simpleEncodings.put("cp850", cp850);
    simpleEncodings.put("IBM850", cp850);
    simpleEncodings.put("ibm850", cp850);
  }
  
  static ByteBuffer growBuffer(ByteBuffer b, int newCapacity)
  {
    b.limit(b.position());
    b.rewind();
    
    int c2 = b.capacity() * 2;
    ByteBuffer on = ByteBuffer.allocate(c2 < newCapacity ? newCapacity : c2);
    
    on.put(b);
    return on;
  }
  
  private static final byte[] HEX_DIGITS = { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 
    68, 69, 70 };
  static final String UTF8 = "UTF8";
  private static final String UTF_DASH_8 = "utf-8";
  
  static void appendSurrogate(ByteBuffer bb, char c)
  {
    bb.put((byte)37);
    bb.put((byte)85);
    
    bb.put(HEX_DIGITS[(c >> '\f' & 0xF)]);
    bb.put(HEX_DIGITS[(c >> '\b' & 0xF)]);
    bb.put(HEX_DIGITS[(c >> '\004' & 0xF)]);
    bb.put(HEX_DIGITS[(c & 0xF)]);
  }
  
  static final ZipEncoding UTF8_ZIP_ENCODING = new FallbackZipEncoding("UTF8");
  
  static ZipEncoding getZipEncoding(String name)
  {
    if (isUTF8(name)) {
      return UTF8_ZIP_ENCODING;
    }
    if (name == null) {
      return new FallbackZipEncoding();
    }
    SimpleEncodingHolder h = (SimpleEncodingHolder)simpleEncodings.get(name);
    if (h != null) {
      return h.getEncoding();
    }
    try
    {
      Charset cs = Charset.forName(name);
      return new NioZipEncoding(cs);
    }
    catch (UnsupportedCharsetException e) {}
    return new FallbackZipEncoding(name);
  }
  
  static boolean isUTF8(String encoding)
  {
    if (encoding == null) {
      encoding = System.getProperty("file.encoding");
    }
    return ("UTF8".equalsIgnoreCase(encoding)) || ("utf-8".equalsIgnoreCase(encoding));
  }
}