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Switched to assuming a single-sided disk, moved out magic constants.

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This commit is contained in:
Thomas Harte 2016-09-26 21:20:30 -04:00
parent 6330e5706c
commit ca53fac732
1 changed files with 13 additions and 8 deletions
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21
Storage/Disk/Formats/AcornADF.cpp
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@ -11,6 +11,11 @@
#include <sys/stat.h>
#include "../Encodings/MFM.hpp"
namespace {
static const unsigned int sectors_per_track = 16;
static const unsigned int bytes_per_sector = 256;
}
using namespace Storage::Disk;
AcornADF::AcornADF(const char *file_name) : _file(nullptr)
@ -20,8 +25,8 @@ AcornADF::AcornADF(const char *file_name) : _file(nullptr)
// very loose validation: the file needs to be a multiple of 256 bytes
// and not ungainly large
if(file_stats.st_size & 255) throw ErrorNotAcornADF;
if(file_stats.st_size < 7 * 256) throw ErrorNotAcornADF;
if(file_stats.st_size % bytes_per_sector) throw ErrorNotAcornADF;
if(file_stats.st_size < 7 * bytes_per_sector) throw ErrorNotAcornADF;
_file = fopen(file_name, "rb");
if(!_file) throw ErrorCantOpen;
@ -49,7 +54,7 @@ unsigned int AcornADF::get_head_position_count()
unsigned int AcornADF::get_head_count()
{
return 2;
return 1;
}
std::shared_ptr<Track> AcornADF::get_track_at_position(unsigned int head, unsigned int position)
@ -57,19 +62,19 @@ std::shared_ptr<Track> AcornADF::get_track_at_position(unsigned int head, unsign
std::shared_ptr<Track> track;
if(head >= 2) return track;
long file_offset = (position * 2 + head) * 256 * 16;
long file_offset = (position * 1 + head) * bytes_per_sector * sectors_per_track;
fseek(_file, file_offset, SEEK_SET);
std::vector<Storage::Encodings::MFM::Sector> sectors;
for(int sector = 0; sector < 16; sector++)
for(int sector = 0; sector < sectors_per_track; sector++)
{
Storage::Encodings::MFM::Sector new_sector;
new_sector.track = (uint8_t)position;
new_sector.side = 0;
new_sector.side = (uint8_t)head;
new_sector.sector = (uint8_t)sector;
new_sector.data.resize(256);
fread(&new_sector.data[0], 1, 256, _file);
new_sector.data.resize(bytes_per_sector);
fread(&new_sector.data[0], 1, bytes_per_sector, _file);
if(feof(_file))
break;