// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
hardisk.c
Generic MAME hard disk implementation, with differencing files
***************************************************************************/
#include <assert.h>
#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;
std::string 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.c_str(), 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
-------------------------------------------------*/
/**
* @fn hard_disk_info *hard_disk_get_info(hard_disk_file *file)
*
* @brief Hard disk get information.
*
* @param [in,out] file If non-null, the file.
*
* @return null if it fails, else a hard_disk_info*.
*/
hard_disk_info *hard_disk_get_info(hard_disk_file *file)
{
return &file->info;
}
/*-------------------------------------------------
hard_disk_read - read sectors from a hard
disk
-------------------------------------------------*/
/**
* @fn UINT32 hard_disk_read(hard_disk_file *file, UINT32 lbasector, void *buffer)
*
* @brief Hard disk read.
*
* @param [in,out] file If non-null, the file.
* @param lbasector The lbasector.
* @param [in,out] buffer If non-null, the buffer.
*
* @return An UINT32.
*/
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
-------------------------------------------------*/
/**
* @fn UINT32 hard_disk_write(hard_disk_file *file, UINT32 lbasector, const void *buffer)
*
* @brief Hard disk write.
*
* @param [in,out] file If non-null, the file.
* @param lbasector The lbasector.
* @param buffer The buffer.
*
* @return An UINT32.
*/
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);
}