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Modified to return nullptr if asked for an extended disk image track that doesn't exist.

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This commit is contained in:
Thomas Harte 2017-08-17 15:32:24 -04:00
parent 4f8b89772e
commit 2c2dd8073c
1 changed files with 8 additions and 2 deletions
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10
Storage/Disk/Formats/CPCDSK.cpp
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@ -57,8 +57,14 @@ std::shared_ptr<Track> CPCDSK::get_uncached_track_at_position(unsigned int head,
// All DSK images reserve 0x100 bytes for their headers.
long file_offset = 0x100;
if(is_extended_) {
// Tracks are a variable size in the original DSK file format; sum the lengths
// of all tracks prior to the interesting one to get a file offset.
// Tracks are a variable size in the original DSK file format.
// Check that there is anything stored for this track.
if(!track_sizes_[chronological_track]) {
return nullptr;
}
// Sum the lengths of all tracks prior to the interesting one to get a file offset.
unsigned int t = 0;
while(t < chronological_track && t < track_sizes_.size()) {
file_offset += track_sizes_[t];