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Moved drive parameter block (DPB) routines to winedos.

This commit is contained in:
Jukka Heinonen 2003-10-27 22:06:10 +00:00 committed by Alexandre Julliard
parent f227cfaac6
commit 181a7cca2b
2 changed files with 247 additions and 216 deletions
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265
dlls/winedos/int21.c
View File

@ -58,6 +58,42 @@ WINE_DEFAULT_DEBUG_CHANNEL(int21);
#include "pshpack1.h"
/*
* Extended Drive Parameter Block.
* This structure is compatible with standard DOS4+ DPB and
* extended DOS7 DPB.
*/
typedef struct _INT21_DPB {
BYTE drive; /* 00 drive number (0=A, ...) */
BYTE unit; /* 01 unit number within device driver */
WORD sector_bytes; /* 02 bytes per sector */
BYTE cluster_sectors; /* 04 highest sector number within a cluster */
BYTE shift; /* 05 shift count to convert clusters into sectors */
WORD num_reserved; /* 06 reserved sectors at beginning of drive */
BYTE num_FAT; /* 08 number of FATs */
WORD num_root_entries; /* 09 number of root directory entries */
WORD first_data_sector; /* 0b number of first sector containing user data */
WORD num_clusters1; /* 0d highest cluster number (number of data clusters + 1) */
WORD sectors_per_FAT; /* 0f number of sectors per FAT */
WORD first_dir_sector; /* 11 sector number of first directory sector */
SEGPTR driver_header; /* 13 address of device driver header */
BYTE media_ID; /* 17 media ID byte */
BYTE access_flag; /* 18 0x00 if disk accessed, 0xff if not */
SEGPTR next; /* 19 pointer to next DPB */
WORD search_cluster1; /* 1d cluster at which to start search for free space */
WORD free_clusters_lo; /* 1f number of free clusters on drive or 0xffff if unknown */
WORD free_clusters_hi; /* 21 hiword of clusters_free */
WORD mirroring_flags; /* 23 active FAT/mirroring flags */
WORD info_sector; /* 25 sector number of file system info sector or 0xffff for none */
WORD spare_boot_sector; /* 27 sector number of backup boot sector or 0xffff for none */
DWORD first_cluster_sector; /* 29 sector number of the first cluster */
DWORD num_clusters2; /* 2d maximum cluster number */
DWORD fat_clusters; /* 31 number of clusters occupied by FAT */
DWORD root_cluster; /* 35 cluster number of start of root directory */
DWORD search_cluster2; /* 39 cluster at which to start searching for free space */
} INT21_DPB;
/*
* Structure for DOS data that can be accessed directly from applications.
* Real and protected mode pointers will be returned to this structure so
@ -87,7 +123,11 @@ typedef struct _INT21_HEAP {
WORD dbcs_size; /* Number of valid ranges in the following table */
BYTE dbcs_table[16]; /* Start/end bytes for N ranges and 00/00 as terminator */
BYTE misc_indos; /* Interrupt 21 nesting flag */
BYTE misc_indos; /* Interrupt 21 nesting flag */
WORD misc_segment; /* Real mode segment for INT21_HEAP */
WORD misc_selector; /* Protected mode selector for INT21_HEAP */
INT21_DPB misc_dpb_list[MAX_DOS_DRIVES]; /* Drive parameter blocks for all drives */
} INT21_HEAP;
@ -353,6 +393,39 @@ static void INT21_FillHeap( INT21_HEAP *heap )
* Initialize InDos flag.
*/
heap->misc_indos = 0;
/*
* FIXME: Should drive parameter blocks (DPB) be
* initialized here and linked to DOS LOL?
*/
}
/***********************************************************************
* INT21_GetHeapPointer
*
* Get pointer for DOS heap (INT21_HEAP).
* Creates and initializes heap on first call.
*/
static INT21_HEAP *INT21_GetHeapPointer( void )
{
static INT21_HEAP *heap_pointer = NULL;
if (!heap_pointer)
{
WORD heap_segment;
WORD heap_selector;
heap_pointer = DOSVM_AllocDataUMB( sizeof(INT21_HEAP),
&heap_segment,
&heap_selector );
heap_pointer->misc_segment = heap_segment;
heap_pointer->misc_selector = heap_selector;
INT21_FillHeap( heap_pointer );
}
return heap_pointer;
}
@ -364,23 +437,94 @@ static void INT21_FillHeap( INT21_HEAP *heap )
*/
static WORD INT21_GetHeapSelector( CONTEXT86 *context )
{
static WORD heap_segment = 0;
static WORD heap_selector = 0;
static BOOL heap_initialized = FALSE;
if (!heap_initialized)
{
INT21_HEAP *ptr = DOSVM_AllocDataUMB( sizeof(INT21_HEAP),
&heap_segment,
&heap_selector );
INT21_FillHeap( ptr );
heap_initialized = TRUE;
}
INT21_HEAP *heap = INT21_GetHeapPointer();
if (!ISV86(context) && DOSVM_IsWin16())
return heap_selector;
return heap->misc_selector;
else
return heap_segment;
return heap->misc_segment;
}
/***********************************************************************
* INT21_FillDrivePB
*
* Fill DOS heap drive parameter block for the specified drive.
* Return TRUE if drive was valid and there were
* no errors while reading drive information.
*/
static BOOL INT21_FillDrivePB( BYTE drive )
{
WCHAR drivespec[3] = {'A', ':', 0};
INT21_HEAP *heap = INT21_GetHeapPointer();
INT21_DPB *dpb;
UINT drivetype;
DWORD cluster_sectors;
DWORD sector_bytes;
DWORD free_clusters;
DWORD total_clusters;
if (drive >= MAX_DOS_DRIVES)
return FALSE;
dpb = &heap->misc_dpb_list[drive];
drivespec[0] += drive;
drivetype = GetDriveTypeW( drivespec );
/*
* FIXME: Does this check work correctly with floppy/cdrom drives?
*/
if (drivetype == DRIVE_NO_ROOT_DIR || drivetype == DRIVE_UNKNOWN)
return FALSE;
/*
* FIXME: Does this check work correctly with floppy/cdrom drives?
*/
if (!GetDiskFreeSpaceW( drivespec, &cluster_sectors, &sector_bytes,
&free_clusters, &total_clusters ))
return FALSE;
/*
* FIXME: Most of the values listed below are incorrect.
* All values should be validated.
*/
dpb->drive = drive;
dpb->unit = 0;
dpb->sector_bytes = sector_bytes;
dpb->cluster_sectors = cluster_sectors - 1;
dpb->shift = 0;
while (cluster_sectors > 1)
{
cluster_sectors /= 2;
dpb->shift++;
}
dpb->num_reserved = 0;
dpb->num_FAT = 1;
dpb->num_root_entries = 2;
dpb->first_data_sector = 2;
dpb->num_clusters1 = total_clusters;
dpb->sectors_per_FAT = 1;
dpb->first_dir_sector = 1;
dpb->driver_header = 0;
dpb->media_ID = (drivetype == DRIVE_FIXED) ? 0xF8 : 0xF0;
dpb->access_flag = 0;
dpb->next = 0;
dpb->search_cluster1 = 0;
dpb->free_clusters_lo = LOWORD(free_clusters);
dpb->free_clusters_hi = HIWORD(free_clusters);
dpb->mirroring_flags = 0;
dpb->info_sector = 0xffff;
dpb->spare_boot_sector = 0xffff;
dpb->first_cluster_sector = 0;
dpb->num_clusters2 = total_clusters;
dpb->fat_clusters = 32;
dpb->root_cluster = 0;
dpb->search_cluster2 = 0;
return TRUE;
}
@ -2282,6 +2426,62 @@ static void INT21_Ioctl( CONTEXT86 *context )
}
/***********************************************************************
* INT21_Fat32
*
* Handler for function 0x73.
*/
static BOOL INT21_Fat32( CONTEXT86 *context )
{
switch (AL_reg(context))
{
case 0x02: /* FAT32 - GET EXTENDED DPB */
{
BYTE drive = INT21_MapDrive( DL_reg(context) );
WORD *ptr = CTX_SEG_OFF_TO_LIN(context,
context->SegEs, context->Edi);
INT21_DPB *target = (INT21_DPB*)(ptr + 1);
INT21_DPB *source;
TRACE( "FAT32 - GET EXTENDED DPB %d\n", DL_reg(context) );
if ( CX_reg(context) < sizeof(INT21_DPB) + 2 || *ptr < sizeof(INT21_DPB) )
{
SetLastError( ERROR_BAD_LENGTH );
return FALSE;
}
if ( !INT21_FillDrivePB( drive ) )
{
SetLastError( ERROR_INVALID_DRIVE );
return FALSE;
}
source = &INT21_GetHeapPointer()->misc_dpb_list[drive];
*ptr = sizeof(INT21_DPB);
memcpy( target, source, sizeof(INT21_DPB));
if (LOWORD(context->Esi) != 0xF1A6)
{
target->driver_header = 0;
target->next = 0;
}
else
{
FIXME( "Caller requested driver and next DPB pointers!\n" );
}
}
break;
default:
INT_BARF( context, 0x21 );
}
return TRUE;
}
/***********************************************************************
* INT21_LongFilename
*
@ -2862,7 +3062,21 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
break;
case 0x1f: /* GET DRIVE PARAMETER BLOCK FOR DEFAULT DRIVE */
INT_Int21Handler( context );
{
BYTE drive = INT21_MapDrive( 0 );
TRACE( "GET DPB FOR DEFAULT DRIVE\n" );
if (INT21_FillDrivePB( drive ))
{
SET_AL( context, 0x00 ); /* success */
SET_BX( context, offsetof( INT21_HEAP, misc_dpb_list[drive] ) );
context->SegDs = INT21_GetHeapSelector( context );
}
else
{
SET_AL( context, 0xff ); /* invalid or network drive */
}
}
break;
case 0x20: /* NULL FUNCTION FOR CP/M COMPATIBILITY */
@ -3008,7 +3222,21 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
break;
case 0x32: /* GET DOS DRIVE PARAMETER BLOCK FOR SPECIFIC DRIVE */
INT_Int21Handler( context );
{
BYTE drive = INT21_MapDrive( DL_reg(context) );
TRACE( "GET DPB FOR SPECIFIC DRIVE %d\n", DL_reg(context) );
if (INT21_FillDrivePB( drive ))
{
SET_AL( context, 0x00 ); /* success */
SET_DX( context, offsetof( INT21_HEAP, misc_dpb_list[drive] ) );
context->SegDs = INT21_GetHeapSelector( context );
}
else
{
SET_AL( context, 0xff ); /* invalid or network drive */
}
}
break;
case 0x33: /* MULTIPLEXED */
@ -3695,7 +3923,8 @@ void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
break;
case 0x73: /* MSDOS7 - FAT32 */
INT_Int21Handler( context );
if (!INT21_Fat32( context ))
bSetDOSExtendedError = TRUE;
break;
case 0xdc: /* CONNECTION SERVICES - GET CONNECTION NUMBER */

198
msdos/int21.c
View File

@ -73,62 +73,9 @@ WINE_DEFAULT_DEBUG_CHANNEL(int21);
#define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
/* Define the drive parameter block, as used by int21/1F
* and int21/32. This table can be accessed through the
* global 'dpb' pointer, which points into the local dos
* heap.
*/
struct DPB
{
BYTE drive_num; /* 0=A, etc. */
BYTE unit_num; /* Drive's unit number (?) */
WORD sector_size; /* Sector size in bytes */
BYTE high_sector; /* Highest sector in a cluster */
BYTE shift; /* Shift count (?) */
WORD reserved; /* Number of reserved sectors at start */
BYTE num_FAT; /* Number of FATs */
WORD dir_entries; /* Number of root dir entries */
WORD first_data; /* First data sector */
WORD high_cluster; /* Highest cluster number */
WORD sectors_in_FAT; /* Number of sectors per FAT */
WORD start_dir; /* Starting sector of first dir */
DWORD driver_head; /* Address of device driver header (?) */
BYTE media_ID; /* Media ID */
BYTE access_flag; /* Prev. accessed flag (0=yes,0xFF=no) */
DWORD next; /* Pointer to next DPB in list */
WORD free_search; /* Free cluster search start */
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 */
};
DWORD dpbsegptr;
struct DosHeap {
BYTE mediaID;
BYTE biosdate[8];
struct DPB dpb;
};
static struct DosHeap *heap;
static WORD DosHeapHandle;
@ -143,7 +90,6 @@ static BOOL INT21_CreateHeap(void)
return FALSE;
}
heap = (struct DosHeap *) GlobalLock16(DosHeapHandle);
dpbsegptr = MAKESEGPTR(DosHeapHandle,(int)&heap->dpb-(int)heap);
strcpy(heap->biosdate, "01/01/80");
return TRUE;
}
@ -223,60 +169,6 @@ static int INT21_GetDriveAllocInfo( CONTEXT86 *context )
return 1;
}
static int FillInDrivePB( int drive )
{
if(!DRIVE_IsValid(drive))
{
SetLastError( ERROR_INVALID_DRIVE );
return 0;
}
else if (heap || INT21_CreateHeap())
{
/* 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
* getting at least _something_ back from here. The 'next' pointer
* does worry me, though. Should we have a complete table of
* separate DPBs per drive? Probably, but I'm lazy. :-) -CH
*/
heap->dpb.drive_num = heap->dpb.unit_num = drive; /*The same?*/
heap->dpb.sector_size = 512;
heap->dpb.high_sector = 1;
heap->dpb.shift = drive < 2 ? 0 : 6; /*6 for HD, 0 for floppy*/
heap->dpb.reserved = 0;
heap->dpb.num_FAT = 1;
heap->dpb.dir_entries = 2;
heap->dpb.first_data = 2;
heap->dpb.high_cluster = 64000;
heap->dpb.sectors_in_FAT = 1;
heap->dpb.start_dir = 1;
heap->dpb.driver_head = 0;
heap->dpb.media_ID = (drive > 1) ? 0xF8 : 0xF0;
heap->dpb.access_flag = 0;
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 ))
{
SET_AL( context, 0x00 );
context->SegDs = SELECTOROF(dpbsegptr);
SET_BX( context, OFFSETOF(dpbsegptr) );
}
else
{
SET_AX( context, 0x00ff );
}
}
static BOOL ioctlGenericBlkDevReq( CONTEXT86 *context )
{
BYTE *dataptr = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
@ -722,20 +614,10 @@ void WINAPI INT_Int21Handler( CONTEXT86 *context )
if (!INT21_GetDriveAllocInfo(context)) SET_AX( context, 0xffff );
break;
case 0x1f: /* GET DRIVE PARAMETER BLOCK FOR DEFAULT DRIVE */
GetDrivePB(context, DRIVE_GetCurrentDrive());
break;
case 0x29: /* PARSE FILENAME INTO FCB */
INT21_ParseFileNameIntoFCB(context);
break;
case 0x32: /* GET DOS DRIVE PARAMETER BLOCK FOR SPECIFIC DRIVE */
TRACE("GET DOS DRIVE PARAMETER BLOCK FOR DRIVE %s\n",
INT21_DriveName( DL_reg(context)));
GetDrivePB(context, DOS_GET_DRIVE( DL_reg(context) ) );
break;
case 0x36: /* GET FREE DISK SPACE */
TRACE("GET FREE DISK SPACE FOR DRIVE %s\n",
INT21_DriveName( DL_reg(context)));
@ -941,86 +823,6 @@ void WINAPI INT_Int21Handler( CONTEXT86 *context )
}
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, context->SegEs, context->Edi);
TRACE("Get Extended DPB: linear buffer address is %p\n", buffer);
/* validate passed-in buffer lengths */
if ((*buffer != 0x3d) || (context->Ecx != 0x3f))
{
WARN("Get Extended DPB: buffer lengths incorrect\n");
WARN("CX = %lx, buffer[0] = %x\n", context->Ecx, *buffer);
SET_CFLAG(context);
SET_AL( 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 */
SET_AX( context, 0 );
}
else
{
SET_AX( 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);
SET_AL( context, 0 );
break;
}
break;
default:
INT_BARF( context, 0x21 );
break;