EMILE/libfloppy/floppy_read_sector.c

44 lines
849 B
C

/*
*
* (c) 2005 Laurent Vivier <LaurentVivier@wanadoo.fr>
*
*/
#include <sys/types.h>
#include <string.h>
#include <macos/devices.h>
#include "libfloppy.h"
/* offset is a block number
* size is the number of bytes to read
*/
int floppy_read_sector(floppy_device_t *device,
off_t offset, void* buffer, size_t size)
{
OSErr err;
ParamBlockRec_t param_block;
/* check size to read is multiple of sector size */
if (size & (SECTOR_SIZE - 1))
return -1;
memset(&param_block, 0, sizeof(param_block));
param_block.ioBuffer = (unsigned long)buffer;
param_block.ioVRefNum = device->unit + 1;
param_block.ioRefNum = -5;
param_block.ioReqCount = size;
param_block.ioPosMode = fsFromStart;
param_block.ioPosOffset = offset << SECTOR_SIZE_BITS;
err = PBReadSync(&param_block);
if (err != noErr)
return -1;
return 0;
}