129 lines
3.5 KiB
Java
129 lines
3.5 KiB
Java
/**
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* Manage rd5 diff-file creation
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*
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* @author ab
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*/
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package btools.mapaccess;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.security.DigestInputStream;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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final public class Rd5DiffManager
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{
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public static void main( String[] args ) throws Exception
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{
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calcDiffs( new File( args[0] ),new File( args[1] ) );
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}
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/**
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* Compute diffs for all RD5 files
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*/
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public static void calcDiffs( File oldDir, File newDir ) throws Exception
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{
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File oldDiffDir = new File( oldDir, "diff" );
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File newDiffDir = new File( newDir, "diff" );
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File[] filesNew = newDir.listFiles();
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for( File fn : filesNew )
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{
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String name = fn.getName();
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if ( !name.endsWith( ".rd5" ) )
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{
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continue;
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}
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if ( fn.length() < 1024*1024 )
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{
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continue; // exclude very small files from diffing
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}
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String basename = name.substring( 0, name.length() - 4 );
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File fo = new File( oldDir, name );
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if ( !fo.isFile() )
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{
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continue;
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}
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// calculate MD5 of old file
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String md5 = getMD5( fo );
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String md5New = getMD5( fn );
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System.out.println( "name=" + name + " md5=" + md5 );
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File specificNewDiffs = new File( newDiffDir, basename );
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specificNewDiffs.mkdirs();
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String diffFileName = md5 + ".df5";
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File diffFile = new File( specificNewDiffs, diffFileName );
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String dummyDiffFileName = md5New + ".df5";
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File dummyDiffFile = new File( specificNewDiffs, dummyDiffFileName );
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dummyDiffFile.createNewFile();
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// calc the new diff
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Rd5DiffTool.diff2files( fo, fn, diffFile );
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// ... and add that to old diff files
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File specificOldDiffs = new File( oldDiffDir, basename );
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if ( specificOldDiffs.isDirectory() )
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{
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File[] oldDiffs = specificOldDiffs.listFiles();
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for( File od : oldDiffs )
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{
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if ( !od.getName().endsWith( ".df5" ) )
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{
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continue;
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}
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if ( System.currentTimeMillis() - od.lastModified() > 9*86400000L )
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{
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continue; // limit diff history to 9 days
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}
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File updatedDiff = new File( specificNewDiffs, od.getName() );
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if ( !updatedDiff.exists() )
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{
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Rd5DiffTool.addDeltas( od, diffFile, updatedDiff );
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updatedDiff.setLastModified( od.lastModified() );
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}
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}
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}
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}
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}
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public static String getMD5( File f ) throws IOException
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{
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
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DigestInputStream dis = new DigestInputStream(bis, md);
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byte[] buf = new byte[8192];
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for (; ; ) {
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int len = dis.read(buf);
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if (len <= 0) {
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break;
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}
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}
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dis.close();
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byte[] bytes = md.digest();
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StringBuilder sb = new StringBuilder();
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for (int j = 0; j < bytes.length; j++) {
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int v = bytes[j] & 0xff;
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sb.append(hexChar(v >>> 4)).append(hexChar(v & 0xf));
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}
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return sb.toString();
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} catch (NoSuchAlgorithmException e) {
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throw new IOException("MD5 algorithm not available", e);
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}
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}
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private static char hexChar( int v )
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{
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return (char) ( v > 9 ? 'a' + (v-10) : '0' + v );
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}
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}
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