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/*********************************************************************
formats/oric_dsk.c
Oric disk images
*********************************************************************/
#include <string.h>
#include "imageutl.h"
#include "flopimg.h"
#include "oric_dsk.h"
#include "basicdsk.h"
#define mfm_disk_header_size 0x0100
#define MFM_ID "MFM_DISK"
#define TRACK_SIZE_MFM 0x1900
struct mfm_disk_sector_info
{
int id_ptr;
int data_ptr;
int sector_size;
UINT8 ddam;
};
struct oricdsk_tag
{
int tracks;
int heads;
int geometry;
int tracksize;
int num_sectors;
struct mfm_disk_sector_info sector_data[32];
};
static struct oricdsk_tag *get_tag(floppy_image_legacy *floppy)
{
struct oricdsk_tag *tag;
tag = (oricdsk_tag *)floppy_tag(floppy);
return tag;
}
static FLOPPY_IDENTIFY(oric_dsk_identify)
{
UINT8 header[mfm_disk_header_size];
floppy_image_read(floppy, header, 0, mfm_disk_header_size);
if ( memcmp( header, MFM_ID, 8 ) ==0) {
int heads = pick_integer_le(header, 8, 4);
int tracks = pick_integer_le(header, 12, 4);
if (floppy_image_size(floppy)==((tracks*heads*TRACK_SIZE_MFM)+mfm_disk_header_size)) {
*vote = 100;
} else {
*vote = 0;
}
} else {
*vote = 0;
}
return FLOPPY_ERROR_SUCCESS;
}
static int oric_get_track_offset(floppy_image_legacy *floppy,int track, int head)
{
if (get_tag(floppy)->geometry==1) {
return mfm_disk_header_size + (get_tag(floppy)->tracksize * track) + (head * get_tag(floppy)->tracksize * get_tag(floppy)->tracks);
} else {
return mfm_disk_header_size + (get_tag(floppy)->tracksize*((track * get_tag(floppy)->heads)+head));
}
}
static int oric_get_heads_per_disk(floppy_image_legacy *floppy)
{
return get_tag(floppy)->heads;
}
static int oric_get_tracks_per_disk(floppy_image_legacy *floppy)
{
return get_tag(floppy)->tracks;
}
static void mfm_info_cache_sector_info(floppy_image_legacy *floppy,int track,int head)
{
UINT8 track_data[TRACK_SIZE_MFM];
/* initialise these with single density values if single density */
UINT8 IdMark = 0x0fe;
UINT8 DataMark = 0x0fb;
UINT8 DeletedDataMark = 0x0f8;
UINT8 SectorCount;
UINT8 SearchCode = 0;
UINT8 sector_number = 0;
int ptr = 0;
int track_offset = oric_get_track_offset(floppy,track,head);
floppy_image_read(floppy, track_data, track_offset, TRACK_SIZE_MFM);
SectorCount = 0;
do
{
switch (SearchCode)
{
/* searching for id's */
case 0:
{
/* found id mark? */
if (track_data[ptr] == IdMark)
{
sector_number = track_data[ptr+3]-1;
/* store pointer to id mark */
get_tag(floppy)->sector_data[sector_number].id_ptr = ptr + track_offset;
SectorCount++;
/* grab N value - used to skip data in data field */
get_tag(floppy)->sector_data[sector_number].sector_size = (1<< (track_data[ptr+4]+7));
/* skip past id field and crc */
ptr+=7;
/* now looking for data field */
SearchCode = 1;
}
else
{
/* update position */
ptr++;
}
}
break;
/* searching for data id's */
case 1:
{
/* found data or deleted data? */
if ((track_data[ptr] == DataMark) || (track_data[ptr] == DeletedDataMark))
{
/* yes */
get_tag(floppy)->sector_data[sector_number].data_ptr = ptr + track_offset + 1;
get_tag(floppy)->sector_data[sector_number].ddam = (track_data[ptr] == DeletedDataMark) ? ID_FLAG_DELETED_DATA : 0;
/* skip data field and id */
ptr += get_tag(floppy)->sector_data[sector_number].sector_size + 3;
/* now looking for id field */
SearchCode = 0;
}
else
{
ptr++;
}
}
break;
default:
break;
}
}
while (ptr < TRACK_SIZE_MFM);
get_tag(floppy)->num_sectors = SectorCount;
}
static floperr_t get_offset(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, UINT64 *offset)
{
UINT64 offs;
/* translate the sector to a raw sector */
if (!sector_is_index)
{
sector -= 1;
}
mfm_info_cache_sector_info(floppy,track,head);
/* check to see if we are out of range */
if ((head < 0) || (head >= get_tag(floppy)->heads) || (track < 0) || (track >= get_tag(floppy)->tracks)
|| (sector < 0) || (sector >=get_tag(floppy)->num_sectors))
return FLOPPY_ERROR_SEEKERROR;
offs = get_tag(floppy)->sector_data[sector].data_ptr;
if (offset)
*offset = offs;
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t internal_oric_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, void *buffer, size_t buflen)
{
UINT64 offset;
floperr_t err;
err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
if (err)
return err;
floppy_image_read(floppy, buffer, offset, buflen);
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t internal_oric_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, const void *buffer, size_t buflen, int ddam)
{
UINT64 offset;
floperr_t err;
err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
if (err)
return err;
floppy_image_write(floppy, buffer, offset, buflen);
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t oric_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
return internal_oric_read_sector(floppy, head, track, sector, FALSE, buffer, buflen);
}
static floperr_t oric_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
return internal_oric_write_sector(floppy, head, track, sector, FALSE, buffer, buflen, ddam);
}
static floperr_t oric_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
return internal_oric_read_sector(floppy, head, track, sector, TRUE, buffer, buflen);
}
static floperr_t oric_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
return internal_oric_write_sector(floppy, head, track, sector, TRUE, buffer, buflen, ddam);
}
static floperr_t oric_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, UINT32 *sector_length)
{
floperr_t err;
err = get_offset(floppy, head, track, sector, FALSE, NULL);
if (err)
return err;
if (sector_length) {
*sector_length = get_tag(floppy)->sector_data[sector].sector_size;
}
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t oric_get_indexed_sector_info(floppy_image_legacy *floppy, int head, int track, int sector_index, int *cylinder, int *side, int *sector, UINT32 *sector_length, unsigned long *flags)
{
floperr_t retVal;
sector_index += 1;
retVal = oric_get_sector_length(floppy, head, track, sector_index, sector_length);
if (sector_length!=NULL) {
*sector_length = get_tag(floppy)->sector_data[sector_index-1].sector_size;
}
if (cylinder)
*cylinder = track;
if (side)
*side = head;
if (sector)
*sector = sector_index;
if (flags)
*flags = get_tag(floppy)->sector_data[sector_index].ddam;
return retVal;
}
static FLOPPY_CONSTRUCT(oric_dsk_construct)
{
struct FloppyCallbacks *callbacks;
struct oricdsk_tag *tag;
UINT8 header[mfm_disk_header_size];
floppy_image_read(floppy, header, 0, mfm_disk_header_size);
tag = (struct oricdsk_tag *) floppy_create_tag(floppy, sizeof(struct oricdsk_tag));
if (!tag)
return FLOPPY_ERROR_OUTOFMEMORY;
tag->heads = pick_integer_le(header, 8, 4);
tag->tracks = pick_integer_le(header, 12, 4);
tag->geometry = pick_integer_le(header, 16, 4);
tag->tracksize = TRACK_SIZE_MFM;
memset(tag->sector_data,0,sizeof(tag->sector_data));
callbacks = floppy_callbacks(floppy);
callbacks->read_sector = oric_read_sector;
callbacks->write_sector = oric_write_sector;
callbacks->read_indexed_sector = oric_read_indexed_sector;
callbacks->write_indexed_sector = oric_write_indexed_sector;
callbacks->get_sector_length = oric_get_sector_length;
callbacks->get_heads_per_disk = oric_get_heads_per_disk;
callbacks->get_tracks_per_disk = oric_get_tracks_per_disk;
callbacks->get_indexed_sector_info = oric_get_indexed_sector_info;
return FLOPPY_ERROR_SUCCESS;
}
/* ----------------------------------------------------------------------- */
LEGACY_FLOPPY_OPTIONS_START( oric )
LEGACY_FLOPPY_OPTION( oricmfm, "dsk", "Oric MFM floppy disk image", oric_dsk_identify, oric_dsk_construct, NULL, NULL)
LEGACY_FLOPPY_OPTION( oric, "dsk", "Oric disk image", basicdsk_identify_default, basicdsk_construct_default, NULL,
HEADS([2])
TRACKS([80])
SECTORS([9])
SECTOR_LENGTH([512])
FIRST_SECTOR_ID([1]))
LEGACY_FLOPPY_OPTIONS_END
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