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Add exposition, expand recorded data.

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This commit is contained in:
Thomas Harte 2023-12-10 22:59:50 -05:00
parent ada627d027
commit d658e00f26
1 changed files with 9 additions and 4 deletions
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13
Storage/Disk/DiskImage/Formats/NIB.cpp
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@ -55,12 +55,17 @@ long NIB::file_offset(Track::Address address) {
}
std::shared_ptr<::Storage::Disk::Track> NIB::get_track_at_position(::Storage::Disk::Track::Address address) {
// NIBs contain data for even-numbered tracks underneath a single head only.
// NIBs contain data for a fixed quantity of integer-position tracks underneath a single head only.
//
// Therefore:
// * reject any attempt to read from the second head;
// * treat 3/4 of any physical track as formatted, the remaining quarter as unformatted; and
// * reject any attempt to read beyond the defined number of tracks.
if(address.head) return nullptr;
if(address.position.as_quarter() & 2) return nullptr;
if(address.position.as_int() >= number_of_tracks) return nullptr;
if((address.position.as_quarter() & 3) == 3) return nullptr;
if(size_t(address.position.as_int()) >= number_of_tracks) return nullptr;
long offset = file_offset(address);
const long offset = file_offset(address);
std::vector<uint8_t> track_data;
{
std::lock_guard lock_guard(file_.get_file_access_mutex());