rockbox/songdbj/FileEntry.java

import java.io.*;

public class FileEntry extends Entry implements Comparable {
		protected String filename;
		protected int hash;
		protected SongEntry sentry;
		protected RundbEntry rentry;
		protected File file;
		
		public FileEntry(File f) throws FileNotFoundException, IOException {
			filename=convertPath(f.getAbsolutePath());
			file=f; 
			sentry=null;
			rentry=null;
		}

    public int compareTo(Object o) {
  	  return String.CASE_INSENSITIVE_ORDER.compare(filename,((FileEntry)o).getFilename());
    }
  
    public String getFilename() { return filename; }
		
		public File getFile() { return file; }
		
		protected void calcHash() throws FileNotFoundException, IOException {
			DataInputStream r = new DataInputStream(new FileInputStream(file));
			byte[] buf = new byte[32768];
			if(sentry!=null) 
				r.skip(sentry.getFirstFrameOffset());
			r.read(buf);
			hash=CalcCRC32(buf);
			r.close();
		}
		
		public int getHash() { return hash; }
		
		public static String add(String t) {
			String add=TagDatabase.getInstance().add;
			if(add!=null)
				return add+t;
			else
				return t;
		}
		
		public static String convertPath(String t) {
			String temp = add(strip(t)).replace('\\','/');
			if (temp.charAt(0)!='/')
				temp="/"+temp;
			return temp;
		}
		
		public static String strip(String t) {
			return stripPrefix(stripDriveletter(stripPrefix(t)));
		}
		
		public static String stripPrefix(String t) {
			String prefix=TagDatabase.getInstance().strip;
			if(prefix!=null&&t.toLowerCase().startsWith(prefix.toLowerCase())) {
				return t.substring(prefix.length());
			}
			return t;
		}
		
		public static String stripDriveletter(String t) {
			if(t.indexOf(':')==1) { // second char is ':'
				return t.substring(2);
			}
			return t;
		}
		
		public void setSongEntry(SongEntry e) { sentry=e; try { calcHash(); } catch(Exception d) { } }
		public void setRundbEntry(RundbEntry e) { rentry=e; }
		public SongEntry getSongEntry() { return sentry; }
		public RundbEntry getRundbEntry() { return rentry; }
		public int getSongEntryOffset() {
			if(sentry!=null)
				return sentry.getOffset();
			else
				return -1;
		}
		public int getRundbEntryOffset() {
/*			if(rentry!=null)
				return rentry.getOffset();
			else*/
				return -1;
		}
  public void write(DataOutputStream w) throws IOException {
			String name=getFilename();
			w.writeBytes(name);
			for(int x=TagDatabase.getInstance().filelen-name.length();x>0;x--)
				w.write(0);
			w.writeInt(hash); 
			w.writeInt(getSongEntryOffset());
			w.writeInt(getRundbEntryOffset());
	}
	
	public static int entrySize() {
		return TagDatabase.getInstance().filelen+12;
	}

  static final int crc_table[] =
        {   // CRC32 lookup table for polynomial 0x04C11DB7
                0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 0x130476DC, 0x17C56B6B,
                0x1A864DB2, 0x1E475005, 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61,
                0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD, 0x4C11DB70, 0x48D0C6C7,
                0x4593E01E, 0x4152FDA9, 0x5F15ADAC, 0x5BD4B01B, 0x569796C2, 0x52568B75,
                0x6A1936C8, 0x6ED82B7F, 0x639B0DA6, 0x675A1011, 0x791D4014, 0x7DDC5DA3,
                0x709F7B7A, 0x745E66CD, 0x9823B6E0, 0x9CE2AB57, 0x91A18D8E, 0x95609039,
                0x8B27C03C, 0x8FE6DD8B, 0x82A5FB52, 0x8664E6E5, 0xBE2B5B58, 0xBAEA46EF,
                0xB7A96036, 0xB3687D81, 0xAD2F2D84, 0xA9EE3033, 0xA4AD16EA, 0xA06C0B5D,
                0xD4326D90, 0xD0F37027, 0xDDB056FE, 0xD9714B49, 0xC7361B4C, 0xC3F706FB,
                0xCEB42022, 0xCA753D95, 0xF23A8028, 0xF6FB9D9F, 0xFBB8BB46, 0xFF79A6F1,
                0xE13EF6F4, 0xE5FFEB43, 0xE8BCCD9A, 0xEC7DD02D, 0x34867077, 0x30476DC0,
                0x3D044B19, 0x39C556AE, 0x278206AB, 0x23431B1C, 0x2E003DC5, 0x2AC12072,
                0x128E9DCF, 0x164F8078, 0x1B0CA6A1, 0x1FCDBB16, 0x018AEB13, 0x054BF6A4,
                0x0808D07D, 0x0CC9CDCA, 0x7897AB07, 0x7C56B6B0, 0x71159069, 0x75D48DDE,
                0x6B93DDDB, 0x6F52C06C, 0x6211E6B5, 0x66D0FB02, 0x5E9F46BF, 0x5A5E5B08,
                0x571D7DD1, 0x53DC6066, 0x4D9B3063, 0x495A2DD4, 0x44190B0D, 0x40D816BA,
                0xACA5C697, 0xA864DB20, 0xA527FDF9, 0xA1E6E04E, 0xBFA1B04B, 0xBB60ADFC,
                0xB6238B25, 0xB2E29692, 0x8AAD2B2F, 0x8E6C3698, 0x832F1041, 0x87EE0DF6,
                0x99A95DF3, 0x9D684044, 0x902B669D, 0x94EA7B2A, 0xE0B41DE7, 0xE4750050,
                0xE9362689, 0xEDF73B3E, 0xF3B06B3B, 0xF771768C, 0xFA325055, 0xFEF34DE2,
                0xC6BCF05F, 0xC27DEDE8, 0xCF3ECB31, 0xCBFFD686, 0xD5B88683, 0xD1799B34,
                0xDC3ABDED, 0xD8FBA05A, 0x690CE0EE, 0x6DCDFD59, 0x608EDB80, 0x644FC637,
                0x7A089632, 0x7EC98B85, 0x738AAD5C, 0x774BB0EB, 0x4F040D56, 0x4BC510E1,
                0x46863638, 0x42472B8F, 0x5C007B8A, 0x58C1663D, 0x558240E4, 0x51435D53,
                0x251D3B9E, 0x21DC2629, 0x2C9F00F0, 0x285E1D47, 0x36194D42, 0x32D850F5,
                0x3F9B762C, 0x3B5A6B9B, 0x0315D626, 0x07D4CB91, 0x0A97ED48, 0x0E56F0FF,
                0x1011A0FA, 0x14D0BD4D, 0x19939B94, 0x1D528623, 0xF12F560E, 0xF5EE4BB9,
                0xF8AD6D60, 0xFC6C70D7, 0xE22B20D2, 0xE6EA3D65, 0xEBA91BBC, 0xEF68060B,
                0xD727BBB6, 0xD3E6A601, 0xDEA580D8, 0xDA649D6F, 0xC423CD6A, 0xC0E2D0DD,
                0xCDA1F604, 0xC960EBB3, 0xBD3E8D7E, 0xB9FF90C9, 0xB4BCB610, 0xB07DABA7,
                0xAE3AFBA2, 0xAAFBE615, 0xA7B8C0CC, 0xA379DD7B, 0x9B3660C6, 0x9FF77D71,
                0x92B45BA8, 0x9675461F, 0x8832161A, 0x8CF30BAD, 0x81B02D74, 0x857130C3,
                0x5D8A9099, 0x594B8D2E, 0x5408ABF7, 0x50C9B640, 0x4E8EE645, 0x4A4FFBF2,
                0x470CDD2B, 0x43CDC09C, 0x7B827D21, 0x7F436096, 0x7200464F, 0x76C15BF8,
                0x68860BFD, 0x6C47164A, 0x61043093, 0x65C52D24, 0x119B4BE9, 0x155A565E,
                0x18197087, 0x1CD86D30, 0x029F3D35, 0x065E2082, 0x0B1D065B, 0x0FDC1BEC,
                0x3793A651, 0x3352BBE6, 0x3E119D3F, 0x3AD08088, 0x2497D08D, 0x2056CD3A,
                0x2D15EBE3, 0x29D4F654, 0xC5A92679, 0xC1683BCE, 0xCC2B1D17, 0xC8EA00A0,
                0xD6AD50A5, 0xD26C4D12, 0xDF2F6BCB, 0xDBEE767C, 0xE3A1CBC1, 0xE760D676,
                0xEA23F0AF, 0xEEE2ED18, 0xF0A5BD1D, 0xF464A0AA, 0xF9278673, 0xFDE69BC4,
                0x89B8FD09, 0x8D79E0BE, 0x803AC667, 0x84FBDBD0, 0x9ABC8BD5, 0x9E7D9662,
                0x933EB0BB, 0x97FFAD0C, 0xAFB010B1, 0xAB710D06, 0xA6322BDF, 0xA2F33668,
                0xBCB4666D, 0xB8757BDA, 0xB5365D03, 0xB1F740B4
        };

  public static int CalcCRC32(byte[] buf) {
			int i;
			int crc = 0xffffffff;
      for (i = 0; i < buf.length; i++)
         crc = (crc << 8) ^ crc_table[(int)((crc >> 24) ^ buf[i]) & 0xFF];
      return crc;
    }
}