Added hard-sector count option

The new hard-sector count option (-H or --hard-sectors) specifies
how many neighbouring index holes to combine to give a full track.

This is currently only supported for KryoFlux images, but can be
expanded to other formats as needed. The SuperCard Pro firmware
appears to limit the revolution count to 5, which may be an issue.

Author: simonowen

include/SAMdisk.h

@@ -271,7 +271,7 @@ typedef struct
 	int base = -1, size = -1, gap3 = -1, interleave = -1, skew = -1, fill = -1;
 	int gaps = -1, gap2 = -1, gap4b = -1, idcrc = -1, gapmask = -1, maxsplice = -1;
 	int cylsfirst = -1, head0 = -1, head1 = -1, steprate = -1, check8k = -1;
-	int offsets = -1, fix = -1, mt = -1, plladjust = -1;
+	int offsets = -1, fix = -1, mt = -1, plladjust = -1, hardsectors = -1;
 
 	int command = 0, hex = 0, debug = 0, verbose = 0, log = 0, force = 0, quick = 0;
 	int merge = 0, repair = 0, trim = 0, calibrate = 0, newdrive = 0, byteswap = 0;

src/KryoFlux.cpp

@@ -217,6 +217,7 @@ void KryoFlux::ReadFlux (int revs, FluxData &flux_revs, std::vector<std::string>
 	uint32_t time = 0, stream_pos = 0;
 	uint32_t ps_per_tick = PS_PER_TICK(SAMPLE_FREQ);
 	std::vector<uint32_t> index_offsets;
+	int hard_indexes = 0;
 
 	auto itBegin = data.begin(), it = itBegin, itEnd = data.end();
 	while (it != itEnd)
@@ -272,8 +273,13 @@ void KryoFlux::ReadFlux (int revs, FluxData &flux_revs, std::vector<std::string>
 					{
 						assert(size == 12);
 
-						auto pdw = reinterpret_cast<const uint32_t *>(&*it);
-						index_offsets.push_back(util::letoh(pdw[0]));
+						// Soft-sectored disks have a single start-of-track index.
+						// Hard-sectors are combined to achieve the same result.
+						if (opt.hardsectors <= 1 || !(++hard_indexes % opt.hardsectors))
+						{
+							auto pdw = reinterpret_cast<const uint32_t *>(&*it);
+							index_offsets.push_back(util::letoh(pdw[0]));
+						}
 						break;
 					}
 

src/SAMdisk.cpp

@@ -145,6 +145,7 @@ struct option long_options[] =
 	{ "cyls",		required_argument, nullptr, 'c' },
 	{ "head",		required_argument, nullptr, 'h' },
 	{ "sectors",	required_argument, nullptr, 's' },
+	{ "hard-sectors",required_argument,nullptr, 'H' },
 	{ "retries",	required_argument, nullptr, 'r' },
 	{ "rescans",	optional_argument, nullptr, 'R' },
 	{ "double-step",	  no_argument, nullptr, 'd' },
@@ -245,7 +246,7 @@ struct option long_options[] =
 	{ 0, 0, 0, 0 }
 };
 
-static char short_options[] = "?nmdvfLxb:c:h:s:r:R:g:i:k:z:0:1:D:";
+static char short_options[] = "?nmdvfLxb:c:h:s:H:r:R:g:i:k:z:0:1:D:";
 
 bool BadValue (const char *pcszName_)
 {
@@ -285,6 +286,12 @@ bool ParseCommandLine (int argc_, char *argv_[])
 				opt.sectors = util::str_value<long>(optarg);
 				break;
 
+			case 'H':
+				opt.hardsectors = util::str_value<int>(optarg);
+				if (opt.hardsectors <= 1)
+					throw util::exception("invalid hard-sector count '", optarg, "'");
+				break;
+
 			case 'r':
 				opt.retries = util::str_value<int>(optarg);
 				break;