185 lines
6.9 KiB
C
185 lines
6.9 KiB
C
#include <windows.h>
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#include <string.h>
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#include "driveex.h"
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#if 0
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/* // See the "MS-DOS Programmer's Reference" for further information
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// about this structure. */
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typedef struct tagDEVICEPARAMS
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{
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BYTE bSpecFunc; /* Special functions */
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BYTE bDevType; /* Device type */
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WORD wDevAttr; /* Device attributes */
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WORD wCylinders; /* Number of cylinders */
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BYTE bMediaType; /* Media type */
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/* Beginning of BIOS parameter block (BPB) */
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WORD wBytesPerSec; /* Bytes per sector */
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BYTE bSecPerClust; /* Sectors per cluster */
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WORD wResSectors; /* Number of reserved sectors */
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BYTE bFATs; /* Number of FATs */
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WORD wRootDirEnts; /* Number of root-directory entries */
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WORD wSectors; /* Total number of sectors */
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BYTE bMedia; /* Media descriptor */
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WORD wFATsecs; /* Number of sectors per FAT */
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WORD wSecPerTrack; /* Number of sectors per track */
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WORD wHeads; /* Number of heads */
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DWORD dwHiddenSecs; /* Number of hidden sectors */
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DWORD dwHugeSectors; /* Number of sectors if wSectors == 0 */
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/* End of BIOS parameter block (BPB) */
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} DEVICEPARAMS, FAR * LPDEVICEPARAMS;
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/* Function prototypes */
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BOOL GetDeviceParameters (int nDrive, LPDEVICEPARAMS dp);
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BOOL IsCDRomDrive (int nDrive);
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/*----------------------------------------------------------------- */
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/* GetDeviceParameters() */
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/* */
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/* Fills a DEVICEPARAMS struct with info about the given drive. */
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/* Calls DOS IOCTL Get Device Parameters (440Dh, 60h) function. */
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/* */
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/* Parameters */
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/* nDrive Drive number 0 = A, 1 = B, 2 = C, and so on. */
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/* dp Pointer to a structure that will contain the drive's */
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/* parameters. */
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/* */
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/* Returns TRUE if it succeeded, FALSE if it failed. */
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/*----------------------------------------------------------------- */
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#pragma warning(disable:4704) /* in-line asm precludes global optimizations */
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BOOL GetDeviceParameters (int nDrive, LPDEVICEPARAMS dp)
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{
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BOOL bResult = TRUE; /* Assume success */
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__asm {
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push ds
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mov bx, nDrive
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inc bx /* Convert 0-based #'s to 1-based #s */
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mov ch, 08h /* Device category--must be 08h */
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mov cl, 60h /* MS-DOS IOCTL Get Device Parameters */
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lds dx, dp
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mov ax, 440Dh
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int 21h
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jnc gdp_done /* CF SET if error */
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mov bResult, FALSE
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gdp_done:
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pop ds
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}
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return (bResult);
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}
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#pragma warning(default:4704) /* in-line asm precludes global optimizations */
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/*----------------------------------------------------------------- */
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/* IsCDRomDrive() */
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/* */
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/* Determines if a drive is a CD-ROM. Calls MSCDEX and checks */
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/* that MSCDEX is loaded, and that MSCDEX reports the drive is a */
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/* CD-ROM. */
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/* */
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/* Parameters */
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/* nDrive Drive number 0 = A, 1 = B, 2 = C, and so forth. */
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/* */
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/* Returns TRUE if nDrive is a CD-ROM drive, FALSE if it isn't. */
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/*----------------------------------------------------------------- */
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#pragma warning(disable:4704) /* in-line asm precludes global optimizations */
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BOOL IsCDRomDrive (int nDrive)
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{
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BOOL bResult = FALSE; /* Assume not a CD-ROM drive */
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__asm {
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mov ax, 150Bh /* MSCDEX CD-ROM Drive Check */
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xor bx, bx
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mov cx, nDrive
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int 2Fh
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cmp bx, 0ADADh /* Check MSCDEX signature */
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jne not_cd_drive
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or ax, ax /* Check the drive type */
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jz not_cd_drive /* 0 (zero) means not CD-ROM */
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mov bResult, TRUE
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not_cd_drive:
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}
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return (bResult);
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}
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#pragma warning(default:4704) /* in-line asm precludes global optimizations */
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#endif
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/*----------------------------------------------------------------- */
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/* GetDriveTypeEx() */
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/* */
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/* Determines the type of a drive. Calls Windows's GetDriveType */
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/* to determine if a drive is valid, fixed, remote, or removeable, */
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/* then breaks down these categories further to specific device */
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/* types. */
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/* */
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/* Parameters */
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/* nDrive Drive number 0 = A, 1 = B, 2 = C, etc. */
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/* */
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/* Returns one of: */
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/* EX_DRIVE_INVALID -- Drive not detected */
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/* EX_DRIVE_REMOVABLE -- Unknown removable-media type drive */
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/* EX_DRIVE_FIXED -- Hard disk drive */
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/* EX_DRIVE_REMOTE -- Remote drive on a network */
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/* EX_DRIVE_CDROM -- CD-ROM drive */
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/* EX_DRIVE_FLOPPY -- Floppy disk drive */
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/* EX_DRIVE_RAMDISK -- RAM disk */
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/*----------------------------------------------------------------- */
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UINT GetDriveTypeEx (int nDrive)
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{
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#if 0
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DEVICEPARAMS dp;
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UINT uType;
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_fmemset (&dp, 0, sizeof(dp)); /* Init device params struct */
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uType = GetDriveType (nDrive);
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switch (uType)
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{
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case DRIVE_REMOTE:
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/* GetDriveType() reports CD-ROMs as Remote drives. Need */
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/* to see if the drive is a CD-ROM or a network drive. */
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if (IsCDRomDrive (nDrive))
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return (EX_DRIVE_CDROM);
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else
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return (EX_DRIVE_REMOTE);
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break;
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case DRIVE_REMOVABLE:
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/* Check for a floppy disk drive. If it isn't, then we */
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/* don't know what kind of removable media it is. */
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/* For example, could be a Bernoulli box or something new... */
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if (GetDeviceParameters (nDrive, &dp))
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switch (dp.bDevType)
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{
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/* Floppy disk drive types */
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case 0x0: case 0x1: case 0x2: case 0x3:
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case 0x4: case 0x7: case 0x8:
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return (EX_DRIVE_FLOPPY);
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}
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return (EX_DRIVE_REMOVABLE); /* Unknown removable media type */
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break;
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case DRIVE_FIXED:
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/* GetDeviceParameters returns a device type of 0x05 for */
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/* hard disks. Because hard disks and RAM disks are the two */
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/* types of fixed-media drives, we assume that any fixed- */
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/* media drive that isn't a hard disk is a RAM disk. */
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if (GetDeviceParameters (nDrive, &dp) && dp.bDevType == 0x05)
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return (EX_DRIVE_FIXED);
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else
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return (EX_DRIVE_RAMDISK);
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break;
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#endif
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UINT uType;
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CHAR achRoot[4];
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achRoot[0] = 'A'+nDrive;
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achRoot[1] = ':';
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achRoot[2] = '\\';
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achRoot[3] = 0;
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uType = GetDriveTypeA (achRoot);
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switch (uType)
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{
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case DRIVE_REMOVABLE:
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return (EX_DRIVE_REMOVABLE); /* Unknown removable media type */
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case DRIVE_FIXED:
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return (EX_DRIVE_FIXED);
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case DRIVE_REMOTE:
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return (EX_DRIVE_REMOTE);
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case DRIVE_CDROM:
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return (EX_DRIVE_CDROM);
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case DRIVE_RAMDISK:
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return (EX_DRIVE_RAMDISK);
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}
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return (EX_DRIVE_INVALID); /* Drive is invalid if we get here. */
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} |