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Implemented FAT32 function 7302 (Get Extended DPB).

This commit is contained in:
Ian Schmidt 2000-04-04 18:55:23 +00:00 committed by Alexandre Julliard
parent 5dff4fb2ab
commit 21c04b9d9a
1 changed files with 118 additions and 5 deletions
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123
msdos/int21.c
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@ -75,6 +75,29 @@ struct DPB
WORD free_clusters; /* Number of free clusters (0xFFFF=unknown) */
};
struct EDPB /* FAT32 extended Drive Parameter Block */
{ /* from Ralf Brown's Interrupt List */
struct DPB dpb; /* first 24 bytes = original DPB */
BYTE edpb_flags; /* undocumented/unknown flags */
DWORD next_edpb; /* pointer to next EDPB */
WORD free_cluster; /* cluster to start search for free space on write, typically
the last cluster allocated */
WORD clusters_free; /* number of free clusters on drive or FFFF = unknown */
WORD clusters_free_hi; /* hiword of clusters_free */
WORD mirroring_flags; /* mirroring flags: bit 7 set = do not mirror active FAT */
/* bits 0-3 = 0-based number of the active FAT */
WORD info_sector; /* sector number of file system info sector, or FFFF for none */
WORD spare_boot_sector; /* sector number of backup boot sector, or FFFF for none */
DWORD first_cluster; /* sector number of the first cluster */
DWORD max_cluster; /* sector number of the last cluster */
DWORD fat_clusters; /* number of clusters occupied by FAT */
DWORD root_cluster; /* cluster number of start of root directory */
DWORD free_cluster2; /* same as free_cluster: cluster at which to start
search for free space when writing */
};
WORD CodePage = 437;
DWORD dpbsegptr;
@ -180,17 +203,15 @@ static int INT21_GetDriveAllocInfo( CONTEXT86 *context )
return 1;
}
static void GetDrivePB( CONTEXT86 *context, int drive )
static int FillInDrivePB( int drive )
{
if(!DRIVE_IsValid(drive))
{
SetLastError( ERROR_INVALID_DRIVE );
AX_reg(context) = 0x00ff;
return 0;
}
else if (heap || INT21_CreateHeap())
{
FIXME("GetDrivePB not fully implemented.\n");
/* FIXME: I have no idea what a lot of this information should
* say or whether it even really matters since we're not allowing
* direct block access. However, some programs seem to depend on
@ -215,11 +236,24 @@ static void GetDrivePB( CONTEXT86 *context, int drive )
heap->dpb.next = 0;
heap->dpb.free_search = 0;
heap->dpb.free_clusters = 0xFFFF; /* unknown */
return 1;
}
return 0;
}
static void GetDrivePB( CONTEXT86 *context, int drive )
{
if (FillInDrivePB( drive ))
{
AL_reg(context) = 0x00;
DS_reg(context) = SELECTOROF(dpbsegptr);
BX_reg(context) = OFFSETOF(dpbsegptr);
}
else
{
AX_reg(context) = 0x00ff;
}
}
@ -2266,7 +2300,6 @@ void WINAPI DOS3Call( CONTEXT86 *context )
case 0x70: /* MS-DOS 7 (Windows95) - ??? (country-specific?)*/
case 0x72: /* MS-DOS 7 (Windows95) - ??? */
case 0x73: /* MS-DOS 7 (Windows95) - DRIVE LOCKING ??? */
TRACE("windows95 function AX %04x\n",
AX_reg(context));
WARN(" returning unimplemented\n");
@ -2274,6 +2307,86 @@ void WINAPI DOS3Call( CONTEXT86 *context )
AL_reg(context) = 0;
break;
case 0x73: /* MULTIPLEXED: Win95 OSR2/Win98 FAT32 calls */
TRACE("windows95 function AX %04x\n",
AX_reg(context));
switch (AL_reg(context))
{
case 0x02: /* Get Extended Drive Parameter Block for specific drive */
/* ES:DI points to word with length of data (should be 0x3d) */
{
WORD *buffer;
struct EDPB *edpb;
DWORD cluster_sectors, sector_bytes, free_clusters, total_clusters;
char root[] = "A:\\";
buffer = (WORD *)CTX_SEG_OFF_TO_LIN(context, ES_reg(context), EDI_reg(context));
TRACE("Get Extended DPB: linear buffer address is %p\n", buffer);
/* validate passed-in buffer lengths */
if ((*buffer != 0x3d) || (ECX_reg(context) != 0x3f))
{
WARN("Get Extended DPB: buffer lengths incorrect\n");
WARN("CX = %lx, buffer[0] = %x\n", ECX_reg(context), *buffer);
SET_CFLAG(context);
AL_reg(context) = 0x18; /* bad buffer length */
}
/* buffer checks out */
buffer++; /* skip over length word now */
if (FillInDrivePB( DX_reg(context) ) )
{
edpb = (struct EDPB *)buffer;
/* copy down the old-style DPB portion first */
memcpy(&edpb->dpb, &heap->dpb, sizeof(struct DPB));
/* now fill in the extended entries */
edpb->edpb_flags = 0;
edpb->next_edpb = 0;
edpb->free_cluster = edpb->free_cluster2 = 0;
/* determine free disk space */
*root += DOS_GET_DRIVE( DX_reg(context) );
GetDiskFreeSpaceA( root, &cluster_sectors, &sector_bytes,
&free_clusters, &total_clusters );
edpb->clusters_free = (free_clusters&0xffff);
edpb->clusters_free_hi = free_clusters >> 16;
edpb->mirroring_flags = 0;
edpb->info_sector = 0xffff;
edpb->spare_boot_sector = 0xffff;
edpb->first_cluster = 0;
edpb->max_cluster = total_clusters;
edpb->fat_clusters = 32; /* made-up value */
edpb->root_cluster = 0;
RESET_CFLAG(context); /* clear carry */
AX_reg(context) = 0;
}
else
{
AX_reg(context) = 0x00ff;
SET_CFLAG(context);
}
}
break;
case 0x03: /* Get Extended free space on drive */
case 0x04: /* Set DPB for formatting */
case 0x05: /* extended absolute disk read/write */
FIXME("Unimplemented FAT32 int32 function %04x\n", AX_reg(context));
SET_CFLAG(context);
AL_reg(context) = 0;
break;
}
break;
case 0xdc: /* CONNECTION SERVICES - GET CONNECTION NUMBER */
case 0xea: /* NOVELL NETWARE - RETURN SHELL VERSION */
break;