mirror of
https://github.com/reactos/reactos.git
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235 lines
6.7 KiB
C
235 lines
6.7 KiB
C
/*-----------------------------------------------------------------------*/
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/* Low level disk I/O module skeleton for FatFs (C)ChaN, 2014 */
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/*-----------------------------------------------------------------------*/
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/* If a working storage control module is available, it should be */
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/* attached to the FatFs via a glue function rather than modifying it. */
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/* This is an example of glue functions to attach various exsisting */
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/* storage control modules to the FatFs module with a defined API. */
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/*-----------------------------------------------------------------------*/
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#include "diskio.h" /* FatFs lower layer API */
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#include <stdio.h>
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/*-----------------------------------------------------------------------*/
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/* Correspondence between physical drive number and image file handles. */
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UINT sectorCount[1] = { 0 };
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FILE* driveHandle[1] = { NULL };
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const int driveHandleCount = sizeof(driveHandle) / sizeof(FILE*);
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/*-----------------------------------------------------------------------*/
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/* Open an image file a Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_openimage(BYTE pdrv, const char* imageFileName)
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{
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if (pdrv < driveHandleCount)
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{
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if (driveHandle[0] != NULL)
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return 0;
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driveHandle[0] = fopen(imageFileName, "r+b");
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if (!driveHandle[0])
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{
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driveHandle[0] = fopen(imageFileName, "w+b");
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}
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if (driveHandle[0] != NULL)
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return 0;
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}
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return STA_NOINIT;
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}
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/*-----------------------------------------------------------------------*/
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/* Cleanup a Drive */
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/*-----------------------------------------------------------------------*/
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VOID disk_cleanup(
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BYTE pdrv /* Physical drive nmuber (0..) */
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)
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{
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if (pdrv < driveHandleCount)
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{
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if (driveHandle[pdrv] != NULL)
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{
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fclose(driveHandle[pdrv]);
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driveHandle[pdrv] = NULL;
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}
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}
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}
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/*-----------------------------------------------------------------------*/
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/* Inidialize a Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize(
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BYTE pdrv /* Physical drive nmuber (0..) */
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)
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{
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if (pdrv == 0) /* only one drive (image file) supported atm. */
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{
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return 0;
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}
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return STA_NOINIT;
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}
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/*-----------------------------------------------------------------------*/
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/* Get Disk Status */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_status(
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BYTE pdrv /* Physical drive nmuber (0..) */
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)
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{
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if (pdrv < driveHandleCount)
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{
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if (driveHandle[pdrv] != NULL)
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return 0;
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}
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return STA_NOINIT;
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}
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/*-----------------------------------------------------------------------*/
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/* Read Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_read(
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BYTE pdrv, /* Physical drive nmuber (0..) */
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BYTE *buff, /* Data buffer to store read data */
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DWORD sector, /* Sector address (LBA) */
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UINT count /* Number of sectors to read (1..128) */
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)
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{
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DWORD result;
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if (pdrv < driveHandleCount)
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{
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if (driveHandle[pdrv] != NULL)
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{
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if (fseek(driveHandle[pdrv], sector * 512, SEEK_SET))
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return RES_ERROR;
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result = fread(buff, 512, count, driveHandle[pdrv]);
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if (result != count)
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return RES_ERROR;
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return RES_OK;
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}
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}
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return RES_PARERR;
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}
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/*-----------------------------------------------------------------------*/
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/* Write Sector(s) */
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/*-----------------------------------------------------------------------*/
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#if _USE_WRITE
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DRESULT disk_write(
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BYTE pdrv, /* Physical drive nmuber (0..) */
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const BYTE *buff, /* Data to be written */
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DWORD sector, /* Sector address (LBA) */
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UINT count /* Number of sectors to write (1..128) */
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)
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{
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DWORD result;
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if (pdrv < driveHandleCount)
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{
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if (driveHandle[pdrv] != NULL)
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{
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if (fseek(driveHandle[pdrv], sector * 512, SEEK_SET))
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return RES_ERROR;
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result = fwrite(buff, 512, count, driveHandle[pdrv]);
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if (result != count)
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return RES_ERROR;
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return RES_OK;
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}
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}
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return RES_PARERR;
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}
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#endif
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/*-----------------------------------------------------------------------*/
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/* Miscellaneous Functions */
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/*-----------------------------------------------------------------------*/
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#if _USE_IOCTL
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DRESULT disk_ioctl(
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BYTE pdrv, /* Physical drive nmuber (0..) */
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BYTE cmd, /* Control code */
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void *buff /* Buffer to send/receive control data */
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)
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{
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if (pdrv < driveHandleCount)
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{
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if (driveHandle[pdrv] != NULL)
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{
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switch (cmd)
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{
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case CTRL_SYNC:
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fflush(driveHandle[pdrv]);
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return RES_OK;
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case GET_SECTOR_SIZE:
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*(DWORD*)buff = 512;
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return RES_OK;
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case GET_BLOCK_SIZE:
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*(DWORD*)buff = 512;
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return RES_OK;
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case GET_SECTOR_COUNT:
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{
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if (sectorCount[pdrv] <= 0)
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{
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if (fseek(driveHandle[pdrv], 0, SEEK_END))
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printf("fseek failed!\n");
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else
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sectorCount[pdrv] = ftell(driveHandle[pdrv]) / 512;
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}
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*(DWORD*)buff = sectorCount[pdrv];
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return RES_OK;
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}
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case SET_SECTOR_COUNT:
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{
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int count = *(DWORD*)buff;
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long size;
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sectorCount[pdrv] = count;
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fseek(driveHandle[pdrv], 0, SEEK_END);
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size = ftell(driveHandle[pdrv]) / 512;
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if (size < count)
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{
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if (fseek(driveHandle[pdrv], count * 512 - 1, SEEK_SET))
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return RES_ERROR;
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fwrite(buff, 1, 1, driveHandle[pdrv]);
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return RES_OK;
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}
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else
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{
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// SHRINKING NOT IMPLEMENTED
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return RES_OK;
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}
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}
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}
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}
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}
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return RES_PARERR;
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}
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#endif
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