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-rw-r--r--src/lib/formats/d64_dsk.cpp314
1 files changed, 314 insertions, 0 deletions
diff --git a/src/lib/formats/d64_dsk.cpp b/src/lib/formats/d64_dsk.cpp
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+++ b/src/lib/formats/d64_dsk.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/*********************************************************************
+
+ formats/d64_dsk.c
+
+ Commodore 4040/1541/1551 sector disk image format
+
+ http://unusedino.de/ec64/technical/formats/d64.html
+
+*********************************************************************/
+
+#include "emu.h" // emu_fatalerror, fatalerror
+#include "formats/d64_dsk.h"
+
+d64_format::d64_format()
+{
+ formats = file_formats;
+}
+
+d64_format::d64_format(const format *_formats)
+{
+ formats = _formats;
+}
+
+const char *d64_format::name() const
+{
+ return "d64";
+}
+
+const char *d64_format::description() const
+{
+ return "Commodore 4040/1541/1551 disk image";
+}
+
+const char *d64_format::extensions() const
+{
+ return "d64";
+}
+
+const d64_format::format d64_format::file_formats[] = {
+ { // d64, dos 2, 35 tracks, head 48 tpi, stepper 96 tpi
+ floppy_image::FF_525, floppy_image::SSSD, 683, 35, 1, 256, 9, 8
+ },
+ { // d64, dos 2, 40 tracks, head 48 tpi, stepper 96 tpi
+ floppy_image::FF_525, floppy_image::SSSD, 768, 40, 1, 256, 9, 8
+ },
+ { // d64, dos 2, 42 tracks, head 48 tpi, stepper 96 tpi
+ floppy_image::FF_525, floppy_image::SSSD, 802, 42, 1, 256, 9, 8
+ },
+ {}
+};
+
+const UINT32 d64_format::cell_size[] =
+{
+ 4000, // 16MHz/16/4
+ 3750, // 16MHz/15/4
+ 3500, // 16MHz/14/4
+ 3250 // 16MHz/13/4
+};
+
+const int d64_format::sectors_per_track[] =
+{
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, // 1-17
+ 19, 19, 19, 19, 19, 19, 19, // 18-24
+ 18, 18, 18, 18, 18, 18, // 25-30
+ 17, 17, 17, 17, 17, // 31-35
+ 17, 17, 17, 17, 17, // 36-40
+ 17, 17 // 41-42
+};
+
+const int d64_format::speed_zone[] =
+{
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 1-17
+ 2, 2, 2, 2, 2, 2, 2, // 18-24
+ 1, 1, 1, 1, 1, 1, // 25-30
+ 0, 0, 0, 0, 0, // 31-35
+ 0, 0, 0, 0, 0, // 36-40
+ 0, 0 // 41-42
+};
+
+int d64_format::find_size(io_generic *io, UINT32 form_factor)
+{
+ UINT64 size = io_generic_size(io);
+ for(int i=0; formats[i].sector_count; i++) {
+ const format &f = formats[i];
+ if(size == (UINT32) f.sector_count*f.sector_base_size*f.head_count)
+ return i;
+ if(size == (UINT32) (f.sector_count*f.sector_base_size*f.head_count) + f.sector_count)
+ return i;
+ }
+ return -1;
+}
+
+int d64_format::identify(io_generic *io, UINT32 form_factor)
+{
+ int type = find_size(io, form_factor);
+
+ if (type != -1)
+ return 50;
+
+ return 0;
+}
+
+int d64_format::get_physical_track(const format &f, int head, int track)
+{
+ // skip halftracks
+ return track * 2;
+}
+
+int d64_format::get_disk_id_offset(const format &f)
+{
+ // t18s0 +0xa2
+ return 0x165a2;
+}
+
+void d64_format::get_disk_id(const format &f, io_generic *io, UINT8 &id1, UINT8 &id2)
+{
+ UINT8 id[2];
+ io_generic_read(io, id, get_disk_id_offset(f), 2);
+ id1 = id[0];
+ id2 = id[1];
+}
+
+int d64_format::get_image_offset(const format &f, int _head, int _track)
+{
+ int offset = 0;
+ if (_head) {
+ for (int track = 0; track < f.track_count; track++) {
+ offset += compute_track_size(f, track);
+ }
+ }
+ for (int track = 0; track < _track; track++) {
+ offset += compute_track_size(f, track);
+ }
+ return offset;
+}
+
+int d64_format::compute_track_size(const format &f, int track)
+{
+ return this->get_sectors_per_track(f, track) * f.sector_base_size;
+}
+
+UINT32 d64_format::get_cell_size(const format &f, int track)
+{
+ return cell_size[speed_zone[track]];
+}
+
+int d64_format::get_sectors_per_track(const format &f, int track)
+{
+ return sectors_per_track[track];
+}
+
+floppy_image_format_t::desc_e* d64_format::get_sector_desc(const format &f, int &current_size, int sector_count, UINT8 id1, UINT8 id2, int gap_2)
+{
+ static floppy_image_format_t::desc_e desc[] = {
+ /* 00 */ { SECTOR_LOOP_START, 0, -1 },
+ /* 01 */ { RAWBYTE, 0xff, 5 },
+ /* 02 */ { GCR5, 0x08, 1 },
+ /* 03 */ { CRC, 1 },
+ /* 04 */ { CRC_CBM_START, 1 },
+ /* 05 */ { SECTOR_ID_GCR5 },
+ /* 06 */ { TRACK_ID_DOS2_GCR5 },
+ /* 07 */ { GCR5, id2, 1 },
+ /* 08 */ { GCR5, id1, 1 },
+ /* 09 */ { CRC_END, 1 },
+ /* 10 */ { GCR5, 0x0f, 2 },
+ /* 11 */ { RAWBYTE, 0x55, f.gap_1 },
+ /* 12 */ { RAWBYTE, 0xff, 5 },
+ /* 13 */ { GCR5, 0x07, 1 },
+ /* 14 */ { CRC_CBM_START, 2 },
+ /* 15 */ { SECTOR_DATA_GCR5, -1 },
+ /* 16 */ { CRC_END, 2 },
+ /* 17 */ { CRC, 2 },
+ /* 18 */ { GCR5, 0x00, 2 },
+ /* 19 */ { RAWBYTE, 0x55, gap_2 },
+ /* 20 */ { SECTOR_LOOP_END },
+ /* 21 */ { RAWBYTE, 0x55, 0 },
+ /* 22 */ { RAWBITS, 0x5555, 0 },
+ /* 23 */ { END }
+ };
+
+ current_size = 40 + (1+1+4+2)*10 + (f.gap_1)*8 + 40 + (1+f.sector_base_size+1+2)*10 + gap_2*8;
+
+ current_size *= sector_count;
+ return desc;
+}
+
+void d64_format::build_sector_description(const format &f, UINT8 *sectdata, UINT32 sect_offs, UINT32 error_offs, desc_s *sectors, int sector_count) const
+{
+ for (int i = 0; i < sector_count; i++) {
+ sectors[i].data = sectdata + sect_offs;
+ sectors[i].size = f.sector_base_size;
+ sectors[i].sector_id = i;
+ sectors[i].sector_info = sectdata[error_offs];
+
+ sect_offs += sectors[i].size;
+ error_offs++;
+ }
+}
+
+void d64_format::fix_end_gap(floppy_image_format_t::desc_e* desc, int remaining_size)
+{
+ desc[21].p2 = remaining_size / 8;
+ desc[22].p2 = remaining_size & 7;
+ desc[22].p1 >>= remaining_size & 0x01;
+}
+
+bool d64_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
+{
+ int type = find_size(io, form_factor);
+ if(type == -1)
+ return false;
+
+ const format &f = formats[type];
+
+ UINT64 size = io_generic_size(io);
+ dynamic_buffer img;
+
+ if(size == (UINT32)f.sector_count*f.sector_base_size) {
+ img.resize(size + f.sector_count);
+ memset(&img[0], ERROR_00, size + f.sector_count);
+ }
+ else {
+ img.resize(size);
+ }
+
+ io_generic_read(io, &img[0], 0, size);
+
+ int track_offset = 0, error_offset = f.sector_count*f.sector_base_size;
+
+ UINT8 id1 = 0, id2 = 0;
+ get_disk_id(f, io, id1, id2);
+
+ for (int head = 0; head < f.head_count; head++) {
+ for (int track = 0; track < f.track_count; track++) {
+ int current_size = 0;
+ int total_size = 200000000./this->get_cell_size(f, track);
+ int physical_track = this->get_physical_track(f, head, track);
+ int sector_count = this->get_sectors_per_track(f, track);
+ int track_size = sector_count*f.sector_base_size;
+ int gap2 = this->get_gap2(f, head, track);
+
+ floppy_image_format_t::desc_e *desc = this->get_sector_desc(f, current_size, sector_count, id1, id2, gap2);
+
+ int remaining_size = total_size - current_size;
+ if(remaining_size < 0)
+ throw emu_fatalerror("d64_format: Incorrect track layout, max_size=%d, current_size=%d", total_size, current_size);
+
+ this->fix_end_gap(desc, remaining_size);
+
+ desc_s sectors[40];
+
+ build_sector_description(f, &img[0], track_offset, error_offset, sectors, sector_count);
+ generate_track(desc, physical_track, head, sectors, sector_count, total_size, image);
+
+ track_offset += track_size;
+ error_offset += sector_count;
+ }
+ }
+
+ image->set_variant(f.variant);
+
+ return true;
+}
+
+bool d64_format::save(io_generic *io, floppy_image *image)
+{
+ const format &f = formats[0];
+
+ for(int head=0; head < f.head_count; head++) {
+ for(int track=0; track < f.track_count; track++) {
+ int sector_count = this->get_sectors_per_track(f, track);
+ int track_size = compute_track_size(f, track);
+ UINT8 sectdata[40*256] = { 0 };
+ desc_s sectors[40];
+ int offset = get_image_offset(f, head, track);
+
+ build_sector_description(f, sectdata, 0, 0, sectors, sector_count);
+ extract_sectors(image, f, sectors, track, head, sector_count);
+ io_generic_write(io, sectdata, offset, track_size);
+ }
+ }
+
+ return true;
+}
+
+void d64_format::extract_sectors(floppy_image *image, const format &f, desc_s *sdesc, int track, int head, int sector_count)
+{
+ UINT8 bitstream[500000/8];
+ UINT8 sectdata[50000];
+ desc_xs sectors[256];
+ int physical_track = this->get_physical_track(f, head, track);
+ int cell_size = this->get_cell_size(f, track);
+ int track_size;
+
+ // Extract the sectors
+ generate_bitstream_from_track(physical_track, head, cell_size, bitstream, track_size, image);
+ extract_sectors_from_bitstream_gcr5(bitstream, track_size, sectors, sectdata, sizeof(sectdata), head, f.track_count);
+
+ for(int i=0; i<sector_count; i++) {
+ desc_s &ds = sdesc[i];
+ desc_xs &xs = sectors[ds.sector_id];
+ if(!xs.data)
+ memset((void *)ds.data, 0, ds.size);
+ else if(xs.size < ds.size) {
+ memcpy((void *)ds.data, xs.data, xs.size);
+ memset((UINT8 *)ds.data + xs.size, 0, xs.size - ds.size);
+ } else
+ memcpy((void *)ds.data, xs.data, ds.size);
+ }
+}
+
+const floppy_format_type FLOPPY_D64_FORMAT = &floppy_image_format_creator<d64_format>;