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Diffstat (limited to 'src/lib/formats/d64_dsk.cpp')
-rw-r--r-- | src/lib/formats/d64_dsk.cpp | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/src/lib/formats/d64_dsk.cpp b/src/lib/formats/d64_dsk.cpp new file mode 100644 index 00000000000..531ce441b99 --- /dev/null +++ b/src/lib/formats/d64_dsk.cpp @@ -0,0 +1,314 @@ +// 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 ¤t_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>; 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