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Installs some additional safety guards.

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This commit is contained in:
Thomas Harte 2019-12-19 22:27:50 -05:00
parent ed7f171736
commit 416d68ab3a
1 changed files with 15 additions and 3 deletions
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18
Storage/Disk/DiskImage/Formats/MSA.cpp
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@ -10,6 +10,8 @@
#include "Utility/ImplicitSectors.hpp"
#include <cassert>
using namespace Storage::Disk;
MSA::MSA(const std::string &file_name) :
@ -31,6 +33,9 @@ MSA::MSA(const std::string &file_name) :
// This is an uncompressed track.
uncompressed_tracks_.push_back(file_.read(data_length));
} else {
#ifndef NDEBUG
const auto start_of_track = file_.tell();
#endif
// This is an RLE-compressed track.
std::vector<uint8_t> track;
track.reserve(sectors_per_track_ * 512);
@ -56,12 +61,18 @@ MSA::MSA(const std::string &file_name) :
}
}
if(pointer != data_length || track.size() != sectors_per_track_ * 512) throw Error::InvalidFormat;
#ifndef NDEBUG
assert(file_.tell() - start_of_track == pointer);
#endif
if(pointer != data_length || track.size() != sectors_per_track_ * 512)
throw Error::InvalidFormat;
uncompressed_tracks_.push_back(std::move(track));
}
}
if(uncompressed_tracks_.size() != size_t((ending_track_ - starting_track_ + 1)*sides_)) throw Error::InvalidFormat;
if(uncompressed_tracks_.size() != size_t((ending_track_ - starting_track_ + 1)*sides_))
throw Error::InvalidFormat;
}
std::shared_ptr<::Storage::Disk::Track> MSA::get_track_at_position(::Storage::Disk::Track::Address address) {
@ -71,7 +82,8 @@ std::shared_ptr<::Storage::Disk::Track> MSA::get_track_at_position(::Storage::Di
if(position < starting_track_) return nullptr;
if(position >= ending_track_) return nullptr;
const auto &track = uncompressed_tracks_[size_t(position) * size_t(sides_) + size_t(address.head)];
const auto &track = uncompressed_tracks_[size_t(position - starting_track_) * size_t(sides_) + size_t(address.head)];
assert(!track.empty());
return track_for_sectors(track.data(), sectors_per_track_, uint8_t(position), uint8_t(address.head), 1, 2, true);
}