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Introduces a route from a PCMSegment to a list of [M]FM sectors.

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This commit is contained in:
Thomas Harte 2017-09-25 19:57:11 -04:00
parent a8524daecb
commit 3982e375e3
2 changed files with 16 additions and 4 deletions
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14
Storage/Disk/Encodings/MFM/SegmentParser.cpp
View File

@ -11,14 +11,17 @@
using namespace Storage::Encodings::MFM;
std::map<Storage::Encodings::MFM::Sector::Address, Storage::Encodings::MFM::Sector> Storage::Encodings::MFM::SectorsFromSegment(const Storage::Disk::PCMSegment &&segment) {
std::map<Sector::Address, Sector> result;
std::map<size_t, Storage::Encodings::MFM::Sector> Storage::Encodings::MFM::SectorsFromSegment(const Storage::Disk::PCMSegment &&segment, bool is_double_density) {
std::map<size_t, Sector> result;
Shifter shifter;
shifter.set_is_double_density(is_double_density);
shifter.set_should_obey_syncs(true);
std::unique_ptr<Storage::Encodings::MFM::Sector> new_sector;
bool is_reading = false;
size_t position = 0;
size_t size = 0;
size_t start_location = 0;
for(unsigned int bit = 0; bit < segment.number_of_bits; ++bit) {
shifter.add_input_bit(segment.bit(bit));
@ -31,13 +34,16 @@ std::map<Storage::Encodings::MFM::Sector::Address, Storage::Encodings::MFM::Sect
case Shifter::Token::ID:
new_sector.reset(new Storage::Encodings::MFM::Sector);
is_reading = true;
start_location = bit;
position = 0;
shifter.set_should_obey_syncs(false);
break;
case Shifter::Token::Data:
case Shifter::Token::DeletedData:
if(new_sector) {
is_reading = true;
shifter.set_should_obey_syncs(false);
new_sector->is_deleted = (shifter.get_token() == Shifter::Token::DeletedData);
}
break;
@ -53,13 +59,15 @@ std::map<Storage::Encodings::MFM::Sector::Address, Storage::Encodings::MFM::Sect
size = (size_t)(128 << new_sector->size);
++position;
is_reading = false;
shifter.set_should_obey_syncs(true);
break;
default:
new_sector->data.push_back(shifter.get_byte());
++position;
if(position == size + 4) {
result.insert(std::make_pair(new_sector->address, std::move(*new_sector)));
result.insert(std::make_pair(start_location, std::move(*new_sector)));
is_reading = false;
shifter.set_should_obey_syncs(true);
new_sector.reset();
}
break;

6
Storage/Disk/Encodings/MFM/SegmentParser.hpp
View File

@ -17,7 +17,11 @@ namespace Storage {
namespace Encodings {
namespace MFM {
std::map<Sector::Address, Sector> SectorsFromSegment(const Disk::PCMSegment &&segment);
/*!
Scans @c segment for all included sectors, returning a set that maps from location within
the segment (counted in bits from the beginning) to sector.
*/
std::map<size_t, Sector> SectorsFromSegment(const Disk::PCMSegment &&segment, bool is_double_density);
}
}