DOS ain't dead - zoo cluster size overflow vs chkdsk or scandisk for fat32

zoo cluster size overflow vs chkdsk or scandisk for fat32 (Users)

posted by Ringding, 28.01.2024, 20:13

> I am more optimistic here: The program is open source and there will be
> FreeDOS fans who still have the compilers used for ZOO long ago. Those
> could help us out to create a fixed binary.
>
> A fix for the source code is not hard to write, just changing the data type
> for all occurances of the cluster size should be enough. So the main
> bottleneck from my point of view is finding somebody willing to compile the
> fixed sources after that.

Thanks for reminding me what a horrible development environment DOS was! :-D

The patch:

--- a/msdos.c +++ b/msdos.c @@ -69,7 +69,7 @@ unsigned long space (drive, alloc_size) int drive; -int *alloc_size; +unsigned long *alloc_size; { unsigned long free_space; union REGS regs; @@ -85,7 +85,7 @@ /* ax=0xFFFF on error */ /* cluster size = sectors/cluster * bytes/sector */ - *alloc_size = regs.x.ax * regs.x.cx; + *alloc_size = (unsigned long) regs.x.ax * regs.x.cx; /* space = cluster * alloc_size */ if (regs.x.ax == 0xffff) --- a/zooext.c +++ b/zooext.c @@ -85,7 +85,7 @@ int null_device = 0; /* are we sending to null device? */ #ifndef PORTABLE int fast_ext = 0; /* fast extract as *.?Z? */ -int alloc_size; /* disk allocation unit size */ +unsigned long alloc_size; /* disk allocation unit size */ #endif struct direntry direntry; /* directory entry */ int first_dir = 1; /* first dir entry seen? */ --- a/zoofns.h +++ b/zoofns.h @@ -80,7 +80,7 @@ void zooexit PARMS ((int)); long inlist PARMS ((char *, unsigned int *, unsigned int *, unsigned *, unsigned *, unsigned *, long *, int)); -unsigned long space PARMS ((int, int *)); +unsigned long space PARMS ((int, unsigned long *)); void addbfcrc PARMS ((char *, int)); void addfname PARMS ((char *, long, unsigned int, unsigned int, unsigned, unsigned));

The binary: 7z

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Complete thread:

zoo files extraction - fritz.mueller, 26.01.2024, 17:17 (Users)
- zoo files extraction - RayeR, 26.01.2024, 17:21
  - zoo files extraction - Ringding, 26.01.2024, 17:38
    - zoo files extraction - mceric, 26.01.2024, 21:19
- zoo files extraction - jadoxa, 27.01.2024, 03:55
  - zoo files extraction - mceric, 27.01.2024, 12:01
    - zoo files extraction - fritz.mueller, 27.01.2024, 19:10
      - zoo files extraction - Rugxulo, 27.01.2024, 21:42
        zoo files extraction - Rugxulo, 28.01.2024, 15:34
      - zoo cluster size overflow vs chkdsk or scandisk for fat32 - mceric, 27.01.2024, 21:48
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - Ringding, 28.01.2024, 20:13
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - Rugxulo, 28.01.2024, 22:53
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - RayeR, 29.01.2024, 06:29
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - rr, 29.01.2024, 08:45
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - Ringding, 29.01.2024, 09:03
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - RayeR, 29.01.2024, 13:45
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - fritz.mueller, 29.01.2024, 18:52
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - Rugxulo, 29.01.2024, 21:02
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - rr, 29.01.2024, 08:55
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - roytam, 29.01.2024, 10:06
        zoo cluster size overflow vs chkdsk or scandisk for fat32 - rr, 29.01.2024, 19:07
    - zoo files extraction - RayeR, 28.01.2024, 15:05
      - zoo files extraction - Ringding, 28.01.2024, 20:22
        zoo files extraction - fritz.mueller, 28.01.2024, 22:21