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/***************************************************************************
hardisk.c
Generic MAME hard disk implementation, with differencing files
****************************************************************************
Copyright Aaron Giles
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name 'MAME' nor the names of its contributors may be
used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
***************************************************************************/
#include "harddisk.h"
#include <stdlib.h>
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
struct hard_disk_file
{
chd_file * chd; /* CHD file */
hard_disk_info info; /* hard disk info */
};
/***************************************************************************
CORE IMPLEMENTATION
***************************************************************************/
/*-------------------------------------------------
hard_disk_open - open a hard disk handle,
given a chd_file
-------------------------------------------------*/
hard_disk_file *hard_disk_open(chd_file *chd)
{
int cylinders, heads, sectors, sectorbytes;
hard_disk_file *file;
astring metadata;
chd_error err;
/* punt if no CHD */
if (chd == NULL)
return NULL;
/* read the hard disk metadata */
err = chd->read_metadata(HARD_DISK_METADATA_TAG, 0, metadata);
if (err != CHDERR_NONE)
return NULL;
/* parse the metadata */
if (sscanf(metadata, HARD_DISK_METADATA_FORMAT, &cylinders, &heads, §ors, §orbytes) != 4)
return NULL;
/* allocate memory for the hard disk file */
file = (hard_disk_file *)malloc(sizeof(hard_disk_file));
if (file == NULL)
return NULL;
/* fill in the data */
file->chd = chd;
file->info.cylinders = cylinders;
file->info.heads = heads;
file->info.sectors = sectors;
file->info.sectorbytes = sectorbytes;
return file;
}
/*-------------------------------------------------
hard_disk_close - close a hard disk handle
-------------------------------------------------*/
void hard_disk_close(hard_disk_file *file)
{
free(file);
}
/*-------------------------------------------------
hard_disk_get_chd - get a handle to a CHD
from a hard disk
-------------------------------------------------*/
chd_file *hard_disk_get_chd(hard_disk_file *file)
{
return file->chd;
}
/*-------------------------------------------------
hard_disk_get_info - return information about
a hard disk
-------------------------------------------------*/
hard_disk_info *hard_disk_get_info(hard_disk_file *file)
{
return &file->info;
}
/*-------------------------------------------------
hard_disk_read - read sectors from a hard
disk
-------------------------------------------------*/
UINT32 hard_disk_read(hard_disk_file *file, UINT32 lbasector, void *buffer)
{
chd_error err = file->chd->read_units(lbasector, buffer);
return (err == CHDERR_NONE);
}
/*-------------------------------------------------
hard_disk_write - write sectors to a hard
disk
-------------------------------------------------*/
UINT32 hard_disk_write(hard_disk_file *file, UINT32 lbasector, const void *buffer)
{
chd_error err = file->chd->write_units(lbasector, buffer);
return (err == CHDERR_NONE);
}
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