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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
hardisk.c
Generic MAME hard disk implementation, with differencing files
***************************************************************************/
#include "harddisk.h"
#include "chd.h"
#include "ioprocs.h"
#include "osdcore.h"
#include <cstdlib>
#include <tuple>
/*-------------------------------------------------
constructor - open a hard disk handle,
given a chd_file
-------------------------------------------------*/
hard_disk_file::hard_disk_file(chd_file *_chd)
{
chd = _chd;
fhandle = nullptr;
fileoffset = 0;
std::string metadata;
std::error_condition err;
/* punt if no CHD */
if (chd == nullptr)
throw nullptr;
/* read the hard disk metadata */
err = _chd->read_metadata(HARD_DISK_METADATA_TAG, 0, metadata);
if (err)
throw nullptr;
/* parse the metadata */
if (sscanf(metadata.c_str(), HARD_DISK_METADATA_FORMAT, &hdinfo.cylinders, &hdinfo.heads, &hdinfo.sectors, &hdinfo.sectorbytes) != 4)
throw nullptr;
}
hard_disk_file::hard_disk_file(util::random_read_write &corefile, uint32_t skipoffs)
{
// bail if getting the file length fails
std::uint64_t length;
if (corefile.length(length))
throw nullptr;
chd = nullptr;
fhandle = &corefile;
hdinfo.sectorbytes = 512;
hdinfo.cylinders = 0;
hdinfo.heads = 0;
hdinfo.sectors = 0;
fileoffset = skipoffs;
// attempt to guess geometry in case this is an ATA situation
for (uint32_t totalsectors = (length - skipoffs) / hdinfo.sectorbytes; ; totalsectors++)
for (uint32_t cursectors = 63; cursectors > 1; cursectors--)
if (totalsectors % cursectors == 0)
{
uint32_t totalheads = totalsectors / cursectors;
for (uint32_t curheads = 16; curheads > 1; curheads--)
if (totalheads % curheads == 0)
{
hdinfo.cylinders = totalheads / curheads;
hdinfo.heads = curheads;
hdinfo.sectors = cursectors;
osd_printf_verbose("Guessed CHS of %d/%d/%d\n", hdinfo.cylinders, hdinfo.heads, hdinfo.sectors);
return;
}
}
}
/*-------------------------------------------------
destructor - close a hard disk handle
-------------------------------------------------*/
hard_disk_file::~hard_disk_file()
{
if (fhandle)
fhandle->flush();
}
/*-------------------------------------------------
read - read sectors from a hard disk
-------------------------------------------------*/
/**
* @fn bool read(uint32_t lbasector, void *buffer)
*
* @brief Hard disk read.
*
* @param lbasector The sector number (Linear Block Address) to read.
* @param buffer The buffer where the hard disk data will be placed.
*
* @return True if the operation succeeded
*/
bool hard_disk_file::read(uint32_t lbasector, void *buffer)
{
if (chd)
{
std::error_condition err = chd->read_units(lbasector, buffer);
return !err;
}
else
{
size_t actual = 0;
std::error_condition err = fhandle->seek(fileoffset + (lbasector * hdinfo.sectorbytes), SEEK_SET);
if (!err)
std::tie(err, actual) = util::read(*fhandle, buffer, hdinfo.sectorbytes);
return !err && (actual == hdinfo.sectorbytes);
}
}
/*-------------------------------------------------
write - write sectors to a hard disk
-------------------------------------------------*/
/**
* @fn bool write(uint32_t lbasector, const void *buffer)
*
* @brief Hard disk write.
*
* @param lbasector The sector number (Linear Block Address) to write.
* @param buffer The buffer containing the data to write.
*
* @return True if the operation succeeded
*/
bool hard_disk_file::write(uint32_t lbasector, const void *buffer)
{
if (chd)
{
std::error_condition err = chd->write_units(lbasector, buffer);
return !err;
}
else
{
size_t actual = 0;
std::error_condition err = fhandle->seek(fileoffset + (lbasector * hdinfo.sectorbytes), SEEK_SET);
if (!err)
std::tie(err, actual) = util::write(*fhandle, buffer, hdinfo.sectorbytes);
return !err;
}
}
/*-------------------------------------------------
set_block_size - sets the block size
for a non-CHD-backed hard disk (a bare file).
-------------------------------------------------*/
/**
* @fn bool set_block_size(uint32_t blocksize)
*
* @brief Hard disk set block size (works only for non-CHD-files)
*
* @param blocksize The block size of this hard disk, in bytes.
*
* @return true on success, false on failure. Failure means a CHD is in use and the CHD
* block size does not match the passed in size. If a CHD is in use and the block
* sizes match, success is returned).
*/
bool hard_disk_file::set_block_size(uint32_t blocksize)
{
if (chd)
{
// if the CHD block size matches our block size, we're OK.
if (chd->unit_bytes() == blocksize)
{
return true;
}
// indicate failure, since we can't change the block size of a CHD.
return false;
}
else
{
hdinfo.sectorbytes = blocksize;
return true;
}
}
std::error_condition hard_disk_file::get_inquiry_data(std::vector<uint8_t> &data) const
{
if(chd)
return chd->read_metadata(HARD_DISK_IDENT_METADATA_TAG, 0, data);
else
return std::error_condition(chd_file::error::METADATA_NOT_FOUND);
}
std::error_condition hard_disk_file::get_cis_data(std::vector<uint8_t> &data) const
{
if(chd)
return chd->read_metadata(PCMCIA_CIS_METADATA_TAG, 0, data);
else
return std::error_condition(chd_file::error::METADATA_NOT_FOUND);
}
std::error_condition hard_disk_file::get_disk_key_data(std::vector<uint8_t> &data) const
{
if(chd)
return chd->read_metadata(HARD_DISK_KEY_METADATA_TAG, 0, data);
else
return std::error_condition(chd_file::error::METADATA_NOT_FOUND);
}
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