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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/*********************************************************************
formats/dim_dsk.cpp
DIM disk images
*********************************************************************/
#include "dim_dsk.h"
#include "ioprocs.h"
#include <cstring>
dim_format::dim_format()
{
}
const char *dim_format::name() const noexcept
{
return "dim";
}
const char *dim_format::description() const noexcept
{
return "DIM disk image";
}
const char *dim_format::extensions() const noexcept
{
return "dim";
}
int dim_format::identify(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants) const
{
uint8_t h[16];
size_t actual;
io.read_at(0xab, h, 16, actual);
if(strncmp((const char *)h, "DIFC HEADER", 11) == 0)
return FIFID_SIGN;
return 0;
}
bool dim_format::load(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants, floppy_image &image) const
{
size_t actual;
int offset = 0x100;
uint8_t h;
uint8_t track_total = 77;
int cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666;
io.read_at(0, &h, 1, actual);
int spt, gap3, bps, size;
switch(h) {
case 0:
default:
spt = 8;
gap3 = 0x74;
size = 3;
break;
case 1:
spt = 9;
gap3 = 0x39;
size = 3;
break;
case 3:
spt = 9;
gap3 = 0x39;
size = 3;
break;
case 2:
spt = 15;
gap3 = 0x54;
size = 2;
break;
case 9:
spt = 18;
gap3 = 0x54;
size = 2;
break;
case 17:
spt = 26;
gap3 = 0x33;
size = 1;
break;
}
bps = 128 << size;
for(int track=0; track < track_total; track++)
for(int head=0; head < 2; head++) {
desc_pc_sector sects[30];
uint8_t sect_data[10000];
int sdatapos = 0;
for(int i=0; i<spt; i++) {
sects[i].track = track;
sects[i].head = head;
if(h == 1) // handle 2HS sector layout
{
if(i == 0 && track == 0)
sects[i].sector = i+1;
else
sects[i].sector = i+10;
}
else
sects[i].sector = i+1;
sects[i].size = size;
sects[i].actual_size = bps;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = §_data[sdatapos];
io.read_at(offset, sects[i].data, bps, actual);
offset += bps;
sdatapos += bps;
}
build_pc_track_mfm(track, head, image, cell_count, spt, sects, gap3);
}
return true;
}
bool dim_format::supports_save() const noexcept
{
return false;
}
const dim_format FLOPPY_DIM_FORMAT;
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