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diff --git a/src/devices/imagedev/harddriv.c b/src/devices/imagedev/harddriv.c
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+// license:BSD-3-Clause
+// copyright-holders:Nathan Woods, Raphael Nabet, Miodrag Milanovic
+/*********************************************************************
+
+ Code to interface the image code with harddisk core.
+
+ Raphael Nabet 2003
+
+ Update: 23-Feb-2004 - Unlike floppy disks, for which we support
+ myriad formats on many systems, it is my intention for MESS to
+ standardize on the CHD file format for hard drives so I made a few
+ changes to support this
+
+*********************************************************************/
+
+#include "emu.h"
+#include "emuopts.h"
+#include "harddisk.h"
+#include "harddriv.h"
+
+
+static OPTION_GUIDE_START(hd_option_guide)
+ OPTION_INT('C', "cylinders", "Cylinders")
+ OPTION_INT('H', "heads", "Heads")
+ OPTION_INT('S', "sectors", "Sectors")
+ OPTION_INT('L', "sectorlength", "Sector Bytes")
+ OPTION_INT('K', "hunksize", "Hunk Bytes")
+OPTION_GUIDE_END
+
+static const char *hd_option_spec =
+ "C1-[512]-1024;H1/2/[4]/8;S1-[16]-64;L128/256/[512]/1024;K512/1024/2048/[4096]";
+
+
+// device type definition
+const device_type HARDDISK = &device_creator<harddisk_image_device>;
+
+//-------------------------------------------------
+// harddisk_image_device - constructor
+//-------------------------------------------------
+
+harddisk_image_device::harddisk_image_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, HARDDISK, "Harddisk", tag, owner, clock, "harddisk_image", __FILE__),
+ device_image_interface(mconfig, *this),
+ m_chd(NULL),
+ m_hard_disk_handle(NULL),
+ m_device_image_load(device_image_load_delegate()),
+ m_device_image_unload(device_image_func_delegate()),
+ m_interface(NULL)
+{
+}
+
+//-------------------------------------------------
+// harddisk_image_device - constructor for subclasses
+//-------------------------------------------------
+harddisk_image_device::harddisk_image_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
+ : device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+ device_image_interface(mconfig, *this),
+ m_chd(NULL),
+ m_hard_disk_handle(NULL),
+ m_device_image_load(device_image_load_delegate()),
+ m_device_image_unload(device_image_func_delegate()),
+ m_interface(NULL)
+{
+}
+
+//-------------------------------------------------
+// harddisk_image_device - destructor
+//-------------------------------------------------
+
+harddisk_image_device::~harddisk_image_device()
+{
+}
+
+//-------------------------------------------------
+// device_config_complete - perform any
+// operations now that the configuration is
+// complete
+//-------------------------------------------------
+
+void harddisk_image_device::device_config_complete()
+{
+ m_formatlist.append(*global_alloc(image_device_format("chd", "CHD Hard drive", "chd,hd", hd_option_spec)));
+
+ // set brief and instance name
+ update_names();
+}
+
+const option_guide *harddisk_image_device::create_option_guide() const
+{
+ return hd_option_guide;
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void harddisk_image_device::device_start()
+{
+ m_chd = NULL;
+
+ // try to locate the CHD from a DISK_REGION
+ chd_file *handle = get_disk_handle(machine(), tag());
+ if (handle != NULL)
+ {
+ m_hard_disk_handle = hard_disk_open(handle);
+ }
+ else
+ {
+ m_hard_disk_handle = NULL;
+ }
+}
+
+void harddisk_image_device::device_stop()
+{
+ if (m_hard_disk_handle)
+ hard_disk_close(m_hard_disk_handle);
+}
+
+bool harddisk_image_device::call_load()
+{
+ int our_result;
+
+ our_result = internal_load_hd();
+
+ /* Check if there is an image_load callback defined */
+ if (!m_device_image_load.isnull())
+ {
+ /* Let the override do some additional work/checks */
+ our_result = m_device_image_load(*this);
+ }
+ return our_result;
+
+}
+
+bool harddisk_image_device::call_create(int create_format, option_resolution *create_args)
+{
+ int err;
+ UINT32 sectorsize, hunksize;
+ UINT32 cylinders, heads, sectors, totalsectors;
+ std::string metadata;
+
+ cylinders = option_resolution_lookup_int(create_args, 'C');
+ heads = option_resolution_lookup_int(create_args, 'H');
+ sectors = option_resolution_lookup_int(create_args, 'S');
+ sectorsize = option_resolution_lookup_int(create_args, 'L');
+ hunksize = option_resolution_lookup_int(create_args, 'K');
+
+ totalsectors = cylinders * heads * sectors;
+
+ /* create the CHD file */
+ chd_codec_type compression[4] = { CHD_CODEC_NONE };
+ err = m_origchd.create(*image_core_file(), (UINT64)totalsectors * (UINT64)sectorsize, hunksize, sectorsize, compression);
+ if (err != CHDERR_NONE)
+ goto error;
+
+ /* if we created the image and hence, have metadata to set, set the metadata */
+ strprintf(metadata, HARD_DISK_METADATA_FORMAT, cylinders, heads, sectors, sectorsize);
+ err = m_origchd.write_metadata(HARD_DISK_METADATA_TAG, 0, metadata);
+ m_origchd.close();
+
+ if (err != CHDERR_NONE)
+ goto error;
+
+ return internal_load_hd();
+
+error:
+ return IMAGE_INIT_FAIL;
+}
+
+void harddisk_image_device::call_unload()
+{
+ /* Check if there is an image_unload callback defined */
+ if ( !m_device_image_unload.isnull() )
+ {
+ m_device_image_unload(*this);
+ }
+
+ if (m_hard_disk_handle != NULL)
+ {
+ hard_disk_close(m_hard_disk_handle);
+ m_hard_disk_handle = NULL;
+ }
+
+ m_origchd.close();
+ m_diffchd.close();
+ m_chd = NULL;
+}
+
+/*-------------------------------------------------
+ open_disk_diff - open a DISK diff file
+-------------------------------------------------*/
+
+static chd_error open_disk_diff(emu_options &options, const char *name, chd_file &source, chd_file &diff_chd)
+{
+ std::string fname = std::string(name).append(".dif");
+
+ /* try to open the diff */
+ //printf("Opening differencing image file: %s\n", fname.c_str());
+ emu_file diff_file(options.diff_directory(), OPEN_FLAG_READ | OPEN_FLAG_WRITE);
+ file_error filerr = diff_file.open(fname.c_str());
+ if (filerr == FILERR_NONE)
+ {
+ std::string fullpath(diff_file.fullpath());
+ diff_file.close();
+
+ //printf("Opening differencing image file: %s\n", fullpath.c_str());
+ return diff_chd.open(fullpath.c_str(), true, &source);
+ }
+
+ /* didn't work; try creating it instead */
+ //printf("Creating differencing image: %s\n", fname.c_str());
+ diff_file.set_openflags(OPEN_FLAG_READ | OPEN_FLAG_WRITE | OPEN_FLAG_CREATE | OPEN_FLAG_CREATE_PATHS);
+ filerr = diff_file.open(fname.c_str());
+ if (filerr == FILERR_NONE)
+ {
+ std::string fullpath(diff_file.fullpath());
+ diff_file.close();
+
+ /* create the CHD */
+ //printf("Creating differencing image file: %s\n", fupointllpath.c_str());
+ chd_codec_type compression[4] = { CHD_CODEC_NONE };
+ chd_error err = diff_chd.create(fullpath.c_str(), source.logical_bytes(), source.hunk_bytes(), compression, source);
+ if (err != CHDERR_NONE)
+ return err;
+
+ return diff_chd.clone_all_metadata(source);
+ }
+
+ return CHDERR_FILE_NOT_FOUND;
+}
+
+int harddisk_image_device::internal_load_hd()
+{
+ chd_error err = CHDERR_NONE;
+
+ m_chd = NULL;
+
+ if (m_hard_disk_handle)
+ hard_disk_close(m_hard_disk_handle);
+
+ /* open the CHD file */
+ if (software_entry() != NULL)
+ {
+ m_chd = get_disk_handle(device().machine(), device().subtag("harddriv").c_str());
+ }
+ else
+ {
+ err = m_origchd.open(*image_core_file(), true);
+ if (err == CHDERR_NONE)
+ {
+ m_chd = &m_origchd;
+ }
+ else if (err == CHDERR_FILE_NOT_WRITEABLE)
+ {
+ err = m_origchd.open(*image_core_file(), false);
+ if (err == CHDERR_NONE)
+ {
+ err = open_disk_diff(device().machine().options(), basename_noext(), m_origchd, m_diffchd);
+ if (err == CHDERR_NONE)
+ {
+ m_chd = &m_diffchd;
+ }
+ }
+ }
+ }
+
+ if (m_chd != NULL)
+ {
+ /* open the hard disk file */
+ m_hard_disk_handle = hard_disk_open(m_chd);
+ if (m_hard_disk_handle != NULL)
+ return IMAGE_INIT_PASS;
+ }
+
+ /* if we had an error, close out the CHD */
+ m_origchd.close();
+ m_diffchd.close();
+ m_chd = NULL;
+ seterror(IMAGE_ERROR_UNSPECIFIED, chd_file::error_string(err));
+
+ return IMAGE_INIT_FAIL;
+}
+
+/*************************************
+ *
+ * Get the CHD file (from the src/chd.c core)
+ * after an image has been opened with the hd core
+ *
+ *************************************/
+
+chd_file *harddisk_image_device::get_chd_file()
+{
+ chd_file *result = NULL;
+ hard_disk_file *hd_file = get_hard_disk_file();
+ if (hd_file)
+ result = hard_disk_get_chd(hd_file);
+ return result;
+}