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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*********************************************************************

    formats/abc800_dsk.c

    Luxor ABC 830/832/834/838 disk image formats

*********************************************************************/

#include "formats/abc800_dsk.h"

abc800_format::abc800_format() : wd177x_format(formats)
{
}

const char *abc800_format::name() const
{
	return "abc800";
}

const char *abc800_format::description() const
{
	return "Luxor ABC 830/832/834/838 disk image";
}

const char *abc800_format::extensions() const
{
	return "dsk";
}

const abc800_format::format abc800_format::formats[] = {
	// track description
	// 28xff 6x00 fe 2x00 01 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 02 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 03 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 04 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 05 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 06 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 07 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 08 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 09 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 0a 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 0b 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 0c 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 0d 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 0e 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 0f 00 f7 11xff 6x00 fb 128xe5 f7
	// 27xff 6x00 fe 2x00 10 00 f7 11xff 6x00 fb 128xe5 f7
	// 117xff

	{   //  80K 5 1/4 inch single density single sided
		floppy_image::FF_525, floppy_image::SSSD, floppy_image::FM,
		4000, 16, 40, 1, 128, {}, -1, { 1,2,11,12,5,6,15,16,9,10,pre { line-height: 125%; }
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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/*********************************************************************

    formats/dsk_dsk.c

    DSK disk images

*********************************************************************/

#include "dsk_dsk.h"
#include "flopimg_legacy.h"
#include "imageutl.h"

#include "ioprocs.h"

#include <cstring>

#define MV_CPC      "MV - CPC"
#define EXTENDED    "EXTENDED"

struct dskdsk_tag
{
	int disk_image_type;  /* image type: standard or extended */
	int heads;
	int tracks;
	int sector_size;
	uint64_t track_offsets[84*2]; /* offset within data for each track */

};


static struct dskdsk_tag *get_tag(floppy_image_legacy *floppy)
{
	struct dskdsk_tag *tag;
	tag = (dskdsk_tag *)floppy_tag(floppy);
	return tag;
}



FLOPPY_IDENTIFY( dsk_dsk_identify )
{
	uint8_t header[8];

	floppy_image_read(floppy, header, 0, 8);
	if ( memcmp( header, MV_CPC, 8 ) ==0) {
		*vote = 100;
	} else
	if ( memcmp( header, EXTENDED, 8 ) ==0) {
		*vote = 100;
	} else {
		*vote = 0;
	}
	return FLOPPY_ERROR_SUCCESS;
}

static int dsk_get_heads_per_disk(floppy_image_legacy *floppy)
{
	return get_tag(floppy)->heads;
}

static int dsk_get_tracks_per_disk(floppy_image_legacy *floppy)
{
	return get_tag(floppy)->tracks;
}

static uint64_t dsk_get_track_offset(floppy_image_legacy *floppy, int head, int track)
{
	return get_tag(floppy)->track_offsets[(track<<1) + head];
}

static floperr_t get_offset(floppy_image_legacy *floppy, int head, int track, int sector, bool sector_is_index, uint64_t *offset)
{
	uint64_t offs;
	uint64_t track_offset;
	uint8_t track_info[0x100];
	uint8_t sectors_per_track;
	int i;
	/* translate the sector to a raw sector */

	/* 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) )
		return FLOPPY_ERROR_SEEKERROR;

	track_offset = dsk_get_track_offset(floppy, head, track);

	floppy_image_read(floppy, track_info, track_offset, 0x100);

	sectors_per_track = track_info[0x015];
	if (!sector_is_index) {
		if (sector >= sectors_per_track) {
			return FLOPPY_ERROR_SEEKERROR;
		}
	}

	if (get_tag(floppy)->disk_image_type==0) {
		get_tag(floppy)->sector_size = (1<<(track_info[0x014]+7));
		offs = track_offset + 0x100 +sector * get_tag(floppy)->sector_size;
	} else
= track_info[0x18 + (sector<<3) + 6] + (track_info[0x18+(sector<<3) + 7]<<8); offs = track_offset + 0x100; for (i=0;i<sector;i++) { offs += track_info[0x18 + (i<<3) + 6] + (track_info[0x18+(i<<3) + 7]<<8); } } if (offset) *offset = offs; return FLOPPY_ERROR_SUCCESS; } static floperr_t internal_dsk_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, bool sector_is_index, void *buffer, size_t buflen) { uint64_t 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_dsk_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, bool sector_is_index, const void *buffer, size_t buflen, int ddam) { uint64_t 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 dsk_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen) { return internal_dsk_read_sector(floppy, head, track, sector, false, buffer, buflen); } static floperr_t dsk_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam) { return internal_dsk_write_sector(floppy, head, track, sector, false, buffer, buflen, ddam); } static floperr_t dsk_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen) { return internal_dsk_read_sector(floppy, head, track, sector, true, buffer, buflen); } static floperr_t dsk_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam) { return internal_dsk_write_sector(floppy, head, track, sector, true, buffer, buflen, ddam); } static floperr_t dsk_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, uint32_t *sector_length) { floperr_t err; err = get_offset(floppy, head, track, sector, false, nullptr); if (err) return err; if (sector_length) { *sector_length = get_tag(floppy)->sector_size; } return FLOPPY_ERROR_SUCCESS; } static floperr_t dsk_get_indexed_sector_info(floppy_image_legacy *floppy, int head, int track, int sector_index, int *cylinder, int *side, int *sector, uint32_t *sector_length, unsigned long *flags) { floperr_t retVal; uint64_t offset; uint8_t sector_info[0x100]; int pos; retVal = get_offset(floppy, head, track, sector_index, false, nullptr); offset = dsk_get_track_offset(floppy,head,track); pos = 0x18 + (sector_index << 3); floppy_image_read(floppy, sector_info, offset, 0x100); if (cylinder) *cylinder = sector_info[pos + 0]; if (side) *side = sector_info[pos + 1]; if (sector) *sector = sector_info[pos + 2]; if (sector_length) { *sector_length = 1 << (sector_info[pos + 3] + 7); } if (flags) { *flags = 0; if (sector_info[pos + 4] & 0x20) *flags |= ID_FLAG_CRC_ERROR_IN_ID_FIELD; if (sector_info[pos + 5] & 0x20) *flags |= ID_FLAG_CRC_ERROR_IN_DATA_FIELD; if (sector_info[pos + 5] & 0x40) *flags |= ID_FLAG_DELETED_DATA; } return retVal; } FLOPPY_CONSTRUCT( dsk_dsk_construct ) { struct FloppyCallbacks *callbacks; struct dskdsk_tag *tag; uint8_t header[0x100]; uint64_t tmp = 0; int i; int skip,cnt; if(params) { // create return FLOPPY_ERROR_UNSUPPORTED; } floppy_image_read(floppy, header, 0, 0x100); #ifdef SPOT_DUPLICATES // this allow to spot .dsk files with same data and different headers, making easier to debug softlists. uint32_t temp_size = floppy_image_size(floppy); uint8_t tmp_copy[temp_size - 0x100]; floppy_image_read(floppy,tmp_copy,0x100,temp_size - 0x100); printf("CRC16: %d\n", ccitt_crc16(0xffff, tmp_copy, temp_size - 0x100)); #endif tag = (struct dskdsk_tag *) floppy_create_tag(floppy, sizeof(struct dskdsk_tag)); if (!tag) return FLOPPY_ERROR_OUTOFMEMORY; tag->heads = header[0x31]; if (tag->heads==1) { skip = 2; } else { skip = 1; } tag->tracks = header[0x30]; cnt =0; if ( memcmp( header, MV_CPC, 8 ) ==0) { tag->disk_image_type = 0; tmp = 0x100; for (i=0; i<tag->tracks * tag->heads; i++) { tag->track_offsets[cnt] = tmp; tmp += pick_integer_le(header, 0x32, 2); cnt += skip; } } else { tag->disk_image_type = 1; tmp = 0x100; for (i=0; i<tag->tracks * tag->heads; i++) { tag->track_offsets[cnt] = tmp; tmp += header[0x34 + i] << 8; cnt += skip; } } callbacks = floppy_callbacks(floppy); callbacks->read_sector = dsk_read_sector; callbacks->write_sector = dsk_write_sector; callbacks->read_indexed_sector = dsk_read_indexed_sector; callbacks->write_indexed_sector = dsk_write_indexed_sector; callbacks->get_sector_length = dsk_get_sector_length; callbacks->get_heads_per_disk = dsk_get_heads_per_disk; callbacks->get_tracks_per_disk = dsk_get_tracks_per_disk; callbacks->get_indexed_sector_info = dsk_get_indexed_sector_info; return FLOPPY_ERROR_SUCCESS; } #define DSK_FORMAT_HEADER "MV - CPC" #define EXT_FORMAT_HEADER "EXTENDED CPC DSK" dsk_format::dsk_format() : floppy_image_format_t() { } const char *dsk_format::name() const { return "dsk"; } const char *dsk_format::description() const { return "CPC DSK Format"; } const char *dsk_format::extensions() const { return "dsk"; } bool dsk_format::supports_save() const { return false; } int dsk_format::identify(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants) const { uint8_t header[16]; size_t actual; io.read_at(0, &header, sizeof(header), actual); if ( memcmp( header, DSK_FORMAT_HEADER, 8 ) ==0) { return FIFID_SIGN; } if ( memcmp( header, EXT_FORMAT_HEADER, 16 ) ==0) { return FIFID_SIGN; } return 0; } #pragma pack(1) struct track_header { uint8_t headertag[13]; uint16_t unused1; uint8_t unused1b; uint8_t track_number; uint8_t side_number; uint8_t datarate; uint8_t rec_mode; uint8_t sector_size_code; uint8_t number_of_sector; uint8_t gap3_length; uint8_t filler_byte; }; struct sector_header { uint8_t track; uint8_t side; uint8_t sector_id; uint8_t sector_size_code; uint8_t fdc_status_reg1; uint8_t fdc_status_reg2; uint16_t data_length; }; #pragma pack() bool dsk_format::load(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants, floppy_image *image) const { size_t actual; uint8_t header[0x100]; bool extendformat = false; uint64_t image_size; if (io.length(image_size)) return false; io.read_at(0, &header, sizeof(header), actual); if ( memcmp( header, EXT_FORMAT_HEADER, 16 ) ==0) { extendformat = true; } int heads = header[0x31]; int skip = 1; if (heads==1) { skip = 2; } int tracks = header[0x30]; int img_tracks, img_heads; image->get_maximal_geometry(img_tracks, img_heads); if (tracks > img_tracks) { if (tracks - img_tracks > DUMP_THRESHOLD) { osd_printf_error("dsk: Floppy disk has too many tracks for this drive (floppy tracks=%d, drive tracks=%d).\n", tracks, img_tracks); return false; } else { // Some dumps has a few excess tracks to be safe, // lets be nice and just skip those tracks osd_printf_warning("dsk: Floppy disk has a slight excess of tracks for this drive that will be discarded (floppy tracks=%d, drive tracks=%d).\n", tracks, img_tracks); tracks = img_tracks; } } if (heads > img_heads) osd_printf_warning("dsk: Floppy disk has excess of heads for this drive that will be discarded (floppy heads=%d, drive heads=%d).\n", heads, img_heads); uint64_t track_offsets[84*2]; int cnt =0; if (!extendformat) { int tmp = 0x100; for (int i=0; i<tracks * heads; i++) { track_offsets[cnt] = tmp; tmp += pick_integer_le(header, 0x32, 2); cnt += skip; } } else { int tmp = 0x100; for (int i=0; i<tracks * heads; i++) { int length = header[0x34 + i] << 8; if (length != 0) { track_offsets[cnt] = tmp; tmp += length; } else { track_offsets[cnt] = image_size; } cnt += skip; } } int counter = 0; for(int track=0; track < tracks; track++) { for(int side=0; side < std::min(heads, img_heads); side++) { if(track_offsets[(track<<1)+side] >= image_size) continue; track_header tr; io.read_at(track_offsets[(track<<1)+side], &tr, sizeof(tr), actual); // skip if there are no sectors in this track if (tr.number_of_sector == 0) continue; int protection = 0; int first_sector_code = -1; for(int j=0;j<tr.number_of_sector;j++) { sector_header sector; io.read_at(track_offsets[(track<<1)+side]+sizeof(tr)+(sizeof(sector)*j), &sector, sizeof(sector), actual); if (j == 0) first_sector_code = sector.sector_size_code; if ((j > 0) && (sector.sector_size_code == 2) && (first_sector_code == 6)) protection = 1; // first: 6144 rest: 512 if ((j > 0) && (sector.sector_size_code == j) && (first_sector_code == 0)) protection = 2; // first: 128 rest: N*128 } desc_pc_sector sects[256]; uint8_t sect_data[65536]; int sdatapos = 0; int pos = track_offsets[(track<<1)+side] + 0x100; for(int j=0;j<tr.number_of_sector;j++) { sector_header sector; io.read_at(track_offsets[(track<<1)+side]+sizeof(tr)+(sizeof(sector)*j), &sector, sizeof(sector), actual); sects[j].track = sector.track; sects[j].head = sector.side; sects[j].sector = sector.sector_id; sects[j].size = sector.sector_size_code; if(extendformat) { if (protection == 1) sects[j].actual_size = 512; else if (protection == 2) sects[j].actual_size = 128; else sects[j].actual_size = sector.data_length; } else sects[j].actual_size = 128 << tr.sector_size_code; sects[j].deleted = (sector.fdc_status_reg2 & 0x40); sects[j].bad_crc = ((sector.fdc_status_reg1 & 0x20) || (sector.fdc_status_reg2 & 0x20)); if(!(sector.fdc_status_reg1 & 0x04)) { sects[j].data = sect_data + sdatapos; io.read_at(pos, sects[j].data, sects[j].actual_size, actual); sdatapos += sects[j].actual_size; } else sects[j].data = nullptr; if(extendformat) pos += sector.data_length; else pos += 128 << tr.sector_size_code; } // larger cell count (was 100000) to allow for slightly out of spec images (theatre europe on einstein) build_pc_track_mfm(track, side, image, 105000, tr.number_of_sector, sects, tr.gap3_length); counter++; } } return true; } const dsk_format FLOPPY_DSK_FORMAT;