wvsync/tests/cbdelta.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2004 Net Integration Technologies, Inc.
   4  *
   5  * Generates a librsync delta that can turn one file into another.
   6  * Uses a callback to handle a large delta so it doesn't need to be all in
   7  * memory at once.
   8  *
   9  */
  10
  11 #include <strutils.h>
  12
  13 #include "wvsyncfile.h"
  14
  15 static off_t totalsize = 0;
  16
  17 void deltacb(WvSyncObj &, WvBuf &out)
  18 {
  19     totalsize += out.used();
  20     off_t size = out.used();
  21     wvcon->print("--> deltacb() called (%s)\n", size);
  22     wvcon->print(hexdump_buffer(out.get(size), size));
  23 }
  24
  25
  26 int main(int argc, char *argv[])
  27 {
  28     if (argc < 3)
  29     {
  30         wvcon->print("Usage: %s srcfile newfile\n", argv[0]);
  31         return -1;
  32     }
  33
  34     // grab the signature
  35     WvSyncFile srcfile(argv[1], "");
  36
  37     WvDynBuf sigbuf;
  38     srcfile.getsig(sigbuf);
  39
  40     if (!srcfile.isok())
  41         return -1;
  42
  43     size_t size = sigbuf.used();
  44     wvcon->print("Signature is %s bytes.\n", size);
  45     wvcon->print(hexdump_buffer(sigbuf.peek(0, size), size));
  46
  47     // make the delta
  48     WvSyncFile newfile(argv[2], "");
  49
  50     WvDynBuf deltabuf;
  51     newfile.makedelta(sigbuf, deltabuf, deltacb);
  52
  53     if (!newfile.isok())
  54         return -1;
  55
  56     size = deltabuf.used();
  57     totalsize += size;
  58     wvcon->print("Here's the last bit.\n");
  59     wvcon->print(hexdump_buffer(deltabuf.get(size), size));
  60     wvcon->print("Delta was %s bytes.\n", totalsize);
  61
  62     return 0;
  63 }