From f70e1a5a1075d53a7c5588724c970fbd705605f6 Mon Sep 17 00:00:00 2001 From: Olivier Galibert Date: Mon, 5 Nov 2012 13:22:55 +0000 Subject: [PATCH] (mess) Add a generic wd format [O. Galibert] --- src/lib/formats/wd177x_dsk.c | 369 +++++++++++++++++++++++++++++++++++ src/lib/formats/wd177x_dsk.h | 51 +++++ src/lib/lib.mak | 3 +- 3 files changed, 422 insertions(+), 1 deletion(-) diff --git a/src/lib/formats/wd177x_dsk.c b/src/lib/formats/wd177x_dsk.c index e69de29bb2d..459c72230d0 100644 --- a/src/lib/formats/wd177x_dsk.c +++ b/src/lib/formats/wd177x_dsk.c @@ -0,0 +1,369 @@ +/*************************************************************************** + + Copyright Olivier Galibert + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name 'MAME' nor the names of its contributors may be + used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, + INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + +****************************************************************************/ + +/********************************************************************* + + formats/wd177x_dsk.h + + helper for simple wd177x-formatted disk images + +*********************************************************************/ + +#include "emu.h" +#include "formats/wd177x_dsk.h" + +wd177x_format::wd177x_format(const format *_formats) +{ + formats = _formats; +} + +int wd177x_format::find_size(io_generic *io, UINT32 form_factor) +{ + int size = io_generic_size(io); + for(int i=0; formats[i].form_factor; i++) { + const format &f = formats[i]; + if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor) + continue; + + if(size == compute_track_size(f) * f.track_count * f.head_count) + return i; + } + return -1; +} + +int wd177x_format::identify(io_generic *io, UINT32 form_factor) +{ + int type = find_size(io, form_factor); + + if(type != -1) + return 50; + return 0; +} + +int wd177x_format::compute_track_size(const format &f) const +{ + int track_size; + if(f.sector_base_size) + track_size = f.sector_base_size * f.sector_count; + else { + track_size = 0; + for(int i=0; i != f.sector_count; i++) + track_size += f.per_sector_size[i]; + } + return track_size; +} + +void wd177x_format::build_sector_description(const format &f, UINT8 *sectdata, desc_s *sectors) const +{ + if(f.sector_base_id == -1) { + for(int i=0; i>= 16-(remaining_size & 15); + + int track_size = compute_track_size(f); + + UINT8 sectdata[40*512]; + desc_s sectors[40]; + build_sector_description(f, sectdata, sectors); + + for(int track=0; track < f.track_count; track++) + for(int head=0; head < f.head_count; head++) { + io_generic_read(io, sectdata, (track*f.head_count + head)*track_size, track_size); + generate_track(desc, track, head, sectors, f.sector_count, total_size, image); + } + + image->set_variant(f.variant); + + return true; +} + +bool wd177x_format::supports_save() const +{ + return true; +} + +bool wd177x_format::save(io_generic *io, floppy_image *image) +{ + // Count the number of formats + int formats_count; + for(formats_count=0; formats[formats_count].form_factor; formats_count++); + + // Allocate the storage for the list of testable formats for a + // given cell size + int *candidates = global_alloc_array(int, formats_count); + + // Format we're finally choosing + int chosen_candidate = -1; + + // Previously tested cell size + int min_cell_size = 0; + for(;;) { + // Build the list of all formats for the immediatly superior cell size + int cur_cell_size = 0; + int candidates_count = 0; + for(int i=0; i != formats_count; i++) { + if(image->get_form_factor() == floppy_image::FF_UNKNOWN || + image->get_form_factor() == formats[i].form_factor) { + if(formats[i].cell_size == cur_cell_size) + candidates[candidates_count++] = i; + else if((!cur_cell_size || formats[i].cell_size < cur_cell_size) && + formats[i].cell_size > min_cell_size) { + candidates[0] = i; + candidates_count = 1; + cur_cell_size = formats[i].cell_size; + } + } + } + + min_cell_size = cur_cell_size; + + // No candidates with a cell size bigger than the previously + // tested one, we're done + if(!candidates_count) + break; + + // Filter with track 0 head 0 + check_compatibility(image, candidates, candidates_count); + + // Nobody matches, try with the next cell size + if(!candidates_count) + continue; + + // We have a match at that cell size, we just need to find the + // best one given the geometry + + // If there's only one, we're done + if(candidates_count == 1) { + chosen_candidate = candidates[0]; + break; + } + + // Otherwise, find the best + int tracks, heads; + image->get_actual_geometry(tracks, heads); + chosen_candidate = candidates[0]; + for(int i=1; i != candidates_count; i++) { + const format &cc = formats[chosen_candidate]; + const format &cn = formats[candidates[i]]; + + // Handling enough sides is better than not + if(cn.head_count >= heads && cc.head_count < heads) + goto change; + else if(cc.head_count >= heads && cn.head_count < heads) + goto dont_change; + + // Since we're limited to two heads, at that point head + // count is identical for both formats. + + // Handling enough tracks is better than not + if(cn.track_count >= tracks && cc.track_count < tracks) + goto change; + else if(cn.track_count >= tracks && cc.track_count < tracks) + goto dont_change; + + // Both are on the same side of the track count, so closest is best + if(cc.track_count < tracks && cn.track_count > cc.track_count) + goto change; + if(cc.track_count >= tracks && cn.track_count < cc.track_count) + goto change; + goto dont_change; + + change: + chosen_candidate = candidates[i]; + dont_change: + ; + } + // We have a winner, bail out + break; + } + + // No match, pick the first one and be done with it + if(chosen_candidate == -1) + chosen_candidate = 0; + + + const format &f = formats[chosen_candidate]; + int track_size = compute_track_size(f); + + UINT8 sectdata[40*512]; + desc_s sectors[40]; + build_sector_description(f, sectdata, sectors); + + for(int track=0; track < f.track_count; track++) + for(int head=0; head < f.head_count; head++) { + extract_sectors(image, f, sectors, track, head); + io_generic_write(io, sectdata, (track*f.head_count + head)*track_size, track_size); + } + + return true; +} + +void wd177x_format::check_compatibility(floppy_image *image, int *candidates, int &candidates_count) +{ + UINT8 bitstream[500000/8]; + UINT8 sectdata[50000]; + desc_xs sectors[256]; + int track_size; + + // Extract the sectors + generate_bitstream_from_track(0, 0, formats[candidates[0]].cell_size, bitstream, track_size, image); + extract_sectors_from_bitstream_mfm_pc(bitstream, track_size, sectors, sectdata, sizeof(sectdata)); + + // Check compatibility with every candidate, copy in-place + int *ok_cands = candidates; + for(int i=0; i != candidates_count; i++) { + const format &f = formats[candidates[i]]; + int ns = 0; + for(int j=0; j<256; j++) + if(sectors[j].data) { + int sid; + if(f.sector_base_id == -1) { + for(sid=0; sid < f.sector_count; sid++) + if(f.per_sector_id[sid] == j) + break; + } else + sid = j - f.sector_base_id; + if(sid < 0 || sid > f.sector_count) + goto fail; + if(f.sector_base_size) { + if(sectors[j].size != f.sector_base_size) + goto fail; + } else { + if(sectors[j].size != f.per_sector_size[sid]) + goto fail; + } + ns++; + } + if(ns == f.sector_count) + *ok_cands++ = candidates[i]; + fail: + ; + } + candidates_count = ok_cands - candidates; +} + + +void wd177x_format::extract_sectors(floppy_image *image, const format &f, desc_s *sdesc, int track, int head) +{ + UINT8 bitstream[500000/8]; + UINT8 sectdata[50000]; + desc_xs sectors[256]; + int track_size; + + // Extract the sectors + generate_bitstream_from_track(track, head, f.cell_size, bitstream, track_size, image); + extract_sectors_from_bitstream_mfm_pc(bitstream, track_size, sectors, sectdata, sizeof(sectdata)); + + for(int i=0; i