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Added an attempt to deal with 16-bit allocation units, and to ensure middle-of-file holes are respected.

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This commit is contained in:
Thomas Harte 2017-08-11 10:59:37 -04:00
parent dea782cff9
commit 0411b51582
1 changed files with 16 additions and 6 deletions
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22
Storage/Disk/Parsers/CPM.cpp
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@ -43,6 +43,8 @@ std::unique_ptr<Storage::Disk::CPM::Catalogue> Storage::Disk::CPM::GetCatalogue(
}
std::unique_ptr<Catalogue> result(new Catalogue);
bool has_long_allocation_units = (parameters.tracks * parameters.sectors_per_track * (int)sector_size / parameters.block_size) >= 256;
size_t bytes_per_catalogue_entry = (has_long_allocation_units ? 16 : 8) * (size_t)parameters.block_size;
// From the catalogue, create files.
std::map<std::vector<uint8_t>, size_t> indices_by_name;
@ -71,10 +73,10 @@ std::unique_ptr<Storage::Disk::CPM::Catalogue> Storage::Disk::CPM::GetCatalogue(
}
// figure out where this data needs to be pasted in
int extent = catalogue[c + 12] + (catalogue[c + 14] << 5);
size_t extent = (size_t)(catalogue[c + 12] + (catalogue[c + 14] << 5));
int number_of_records = catalogue[c + 15];
size_t required_size = (size_t)(extent * 128 + number_of_records) * 128;
size_t required_size = extent * bytes_per_catalogue_entry + (size_t)number_of_records * 128;
if(result->files[index].data.size() < required_size) {
result->files[index].data.resize(required_size);
}
@ -82,9 +84,17 @@ std::unique_ptr<Storage::Disk::CPM::Catalogue> Storage::Disk::CPM::GetCatalogue(
int sectors_per_block = parameters.block_size / (int)sector_size;
int records_per_sector = (int)sector_size / 128;
int record = 0;
for(size_t block = 0; block < 16; block++) {
int block_number = catalogue[c + 16 + block];
if(!block_number) continue;
for(size_t block = 0; block < (has_long_allocation_units ? 8 : 16) && record < number_of_records; block++) {
int block_number;
if(has_long_allocation_units) {
block_number = catalogue[c + 16 + (block << 1)] + (catalogue[c + 16 + (block << 1) + 1] << 8);
} else {
block_number = catalogue[c + 16 + block];
}
if(!block_number) {
record += parameters.block_size / 128;
continue;
}
int first_sector = block_number * sectors_per_block;
sector = first_sector % parameters.sectors_per_track;
@ -100,7 +110,7 @@ std::unique_ptr<Storage::Disk::CPM::Catalogue> Storage::Disk::CPM::GetCatalogue(
}
int records_to_copy = std::min(number_of_records - record, records_per_sector);
memcpy(&result->files[index].data[(size_t)(extent * 16384 + record * 128)], sector_contents->data.data(), (size_t)records_to_copy * 128);
memcpy(&result->files[index].data[extent * bytes_per_catalogue_entry + (size_t)record * 128], sector_contents->data.data(), (size_t)records_to_copy * 128);
record += records_to_copy;
}
}