I tried many programs, in Windows and Linux, to no avail.

The problem was that Backuppc (actuallly the perl zip module) created the zip 
file on the fly, with the normal 32bit headers, without knowing that it would 
be bigger than 2G.  Whenever a program tried to get the "central directory", at 
the end of the zip file, it would actually land in the middle of the file.

There were other problems too but, anyway, what I did was code a small program 
that "walks" all entries and dumps them.  I created the directory structure 
first.  Good thing that the files were not compressed.

I'm not particulary proud of the coding but it works, so I'm leaving it here.  
It might help somebody else en in the future.

Thanks to everybody for the tips.

Eduardo.

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>

#define CPBUFSIZE 16384
main()
{
unsigned long i;
long c;
unsigned long descr,efl,fnl,t,t1,t2,t3,t4;
unsigned long   total,csize,usize;
long    flags;
long long       donde;
char name[2000];
unsigned int s[4];
FILE    *arch,*osa;
unsigned char   buf[CPBUFSIZE + 1];
int     chunk;


donde = 0;

        arch = fopen64("broken.zip","r");
        while ((c=fgetc(arch)) != EOF)
        {
                s[0] = c;
                s[1] = fgetc(arch);
                s[2] = fgetc(arch);
                s[3] = fgetc(arch);

                if (s[0] != 0x50)
                {
                        printf("Missing signature! %02x %02x %02x %02x\n",
                        s[0],s[1],s[2],s[3]);
                        exit(1);
                }
                else if (s[1] == 0x4b & s[2] == 0x01 && s[3] == 0x02)
                {
                        printf("Central directory found, stopping\n");
                        exit(0);
                }


                for (i = 0;i < 2;i++)
                        fgetc(arch); 

                t1 = fgetc(arch);
                t2 = fgetc(arch);
                flags = (t1 + (t2 << 8));
                descr = flags & 0x08;

                for (i = 0;i < 10;i++)
                        fgetc(arch); 

                t1 = fgetc(arch);
                t2 = fgetc(arch);
                t3 = fgetc(arch);
                t4 = fgetc(arch);
                csize = t1 + (t2 << 8) + (t3 << 16) + (t4 << 24);


                t1 = fgetc(arch);
                t2 = fgetc(arch);
                t3 = fgetc(arch);
                t4 = fgetc(arch);
                usize = t1 + (t2 << 8) + (t3 << 16) + (t4 << 24);

                t1 = fgetc(arch);
                t2 = fgetc(arch);
                fnl = t1 + (t2 << 8);

                t1 = fgetc(arch);
                t2 = fgetc(arch);
                efl = t1 + (t2 << 8);

                for (i = 0;i < fnl;i++)
                        name[i] = fgetc(arch);
                name[i] = 0;

                printf("%12llx (%12llu) |%s|[flags=%02lX efl=%ld csize=%ld 
usize=%ld fnl=%ld]\n",donde,donde,name,flags,efl,csize,usize,fnl);
                fflush(stdout);

                for (i = 0;i < efl;i++)
                        fgetc(arch); 

                if (csize > 0)
                {
                osa = fopen(name,"w+b");
                total = csize;

                while (total > 0)
                {
                        chunk = (total > CPBUFSIZE) ? CPBUFSIZE : total;
                        fread(buf,chunk,1,arch);
                        fwrite(buf,chunk,1,osa);
                        total -= chunk;
                }
                fclose(osa);
                }

                donde += csize + fnl + efl + 30;

                if (descr)
                {
                for (i = 0;i < 16;i++)
                        fgetc(arch); 
                        donde += 16;
                }

        }
}


-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List:    https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki:    http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/