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DISK: Fix size detection and validation for VHD disks

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This commit is contained in:
Mark Pizzolato
2020-04-13 10:05:46 -07:00
parent d0022e9328
commit 07682806a5
2 changed files with 36 additions and 9 deletions
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43
sim_disk.c
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@@ -394,17 +394,21 @@ return sim_messagef (SCPE_ARG, "Unknown disk format: %s\n", cptr);
/* Show disk format */
t_stat sim_disk_show_fmt (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
static const char *sim_disk_fmt (UNIT *uptr)
{
int32 f = DK_GET_FMT (uptr);
size_t i;
for (i = 0; fmts[i].name; i++)
if (fmts[i].fmtval == f) {
fprintf (st, "%s format", fmts[i].name);
return SCPE_OK;
return fmts[i].name;
}
fprintf (st, "invalid format");
return "invalid";
}
t_stat sim_disk_show_fmt (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
fprintf (st, "%s format", sim_disk_fmt (uptr));
return SCPE_OK;
}
@@ -2089,6 +2093,7 @@ uint32 bytesread;
if (f == NULL)
return SCPE_MEM;
sim_debug_unit (ctx->dbit, uptr, "get_disk_footer(%s)\n", sim_uname (uptr));
switch (DK_GET_FMT (uptr)) { /* case on format */
case DKUF_F_STD: /* SIMH format */
container_size = sim_fsize_ex (uptr->fileref);
@@ -2109,27 +2114,49 @@ switch (DK_GET_FMT (uptr)) { /* case on format */
f = NULL;
break;
case DKUF_F_VHD: /* VHD format */
/* Construct a pseudo simh disk footer*/
memcpy (f->Signature, "simh", 4);
strncpy ((char *)f->DriveType, sim_vhd_disk_get_dtype (uptr->fileref, &f->SectorSize, &f->TransferElementSize, (char *)f->CreatingSimulator), sizeof (f->DriveType));
if (f->SectorCount == 0) { /* Old format VHD footer */
sim_vhd_disk_set_dtype (uptr->fileref, f->DriveType, ctx->sector_size, ctx->xfer_element_size);
sim_vhd_disk_get_dtype (uptr->fileref, &f->SectorSize, &f->TransferElementSize, (char *)f->CreatingSimulator), sizeof (f->DriveType);
f->SectorSize = NtoHl (f->SectorSize);
f->TransferElementSize = NtoHl (f->TransferElementSize);
if ((f->SectorSize == 0) || (NtoHl (f->SectorSize) == 0x00020000)) { /* Old or mangled format VHD footer */
sim_vhd_disk_set_dtype (uptr->fileref, (char *)f->DriveType, ctx->sector_size, ctx->xfer_element_size);
sim_vhd_disk_get_dtype (uptr->fileref, &f->SectorSize, &f->TransferElementSize, (char *)f->CreatingSimulator);
f->SectorSize = NtoHl (f->SectorSize);
f->TransferElementSize = NtoHl (f->TransferElementSize);
}
container_size = sim_vhd_disk_size (uptr->fileref);
f->SectorCount = (uint32)(container_size / f->SectorSize);
f->SectorCount = NtoHl ((uint32)(container_size / NtoHl (f->SectorSize)));
container_size += sizeof (*f); /* Adjust since it is removed below */
f->AccessFormat = DKUF_F_VHD;
strncpy ((char *)f->CreationTime, "\n", sizeof (f->CreationTime));
f->Checksum = NtoHl (eth_crc32 (0, f, sizeof (*f) - sizeof (f->Checksum)));
break;
}
if (f) {
if (f->Checksum != NtoHl (eth_crc32 (0, f, sizeof (*f) - sizeof (f->Checksum)))) {
sim_debug_unit (ctx->dbit, uptr, "No footer found on %s format container: %s\n", sim_disk_fmt (uptr), uptr->filename);
free (f);
f = NULL;
}
else {
ctx->footer = f;
container_size -= sizeof (*f);
sim_debug_unit (ctx->dbit, uptr, "Footer: %s - %s\n"
" Simulator: %s\n"
" DriveType: %s\n"
" SectorSize: %u\n"
" SectorCount: %u\n"
" TransferElementSize: %u\n"
" FooterVersion: %u\n"
" AccessFormat: %u\n"
" CreationTime: %s",
sim_uname (uptr), uptr->filename,
f->CreatingSimulator, f->DriveType, NtoHl(f->SectorSize), NtoHl (f->SectorCount),
NtoHl (f->TransferElementSize), f->FooterVersion, f->AccessFormat, f->CreationTime);
}
}
sim_debug_unit (ctx->dbit, uptr, "Container Size: %u sectors %u bytes each\n", (uint32)(container_size/ctx->sector_size), ctx->sector_size);
ctx->container_size = container_size;
return SCPE_OK;
}