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Opted to pass times by reference and added enough to PCMPatchedTrack that it could start being used by the disk controller, albeit that it doesn't work.

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This commit is contained in:
Thomas Harte 2016-12-17 16:26:45 -05:00
parent dc08a23ceb
commit f1a08b7ab5
5 changed files with 30 additions and 12 deletions
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2
Storage/Disk/Disk.hpp
View File

@ -48,7 +48,7 @@ class Track {
@returns the time jumped to. @returns the time jumped to.
*/ */
virtual Time seek_to(Time time_since_index_hole) = 0; virtual Time seek_to(const Time &time_since_index_hole) = 0;
}; };
/*! /*!

16
Storage/Disk/PCMPatchedTrack.cpp
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@ -10,7 +10,23 @@
using namespace Storage::Disk; using namespace Storage::Disk;
PCMPatchedTrack::PCMPatchedTrack(Track &underlying_track) :
underlying_track_(underlying_track),
active_patch_((size_t)-1)
{}
void PCMPatchedTrack::add_segment(const Time &start_position, const PCMSegment &segment) void PCMPatchedTrack::add_segment(const Time &start_position, const PCMSegment &segment)
{ {
patches_.emplace_back(start_position, segment); patches_.emplace_back(start_position, segment);
} }
Track::Event PCMPatchedTrack::get_next_event()
{
// if(active_patch_ == (size_t)-1)
return underlying_track_.get_next_event();
}
Storage::Time PCMPatchedTrack::seek_to(const Time &time_since_index_hole)
{
return underlying_track_.seek_to(time_since_index_hole);
}

7
Storage/Disk/PCMPatchedTrack.hpp
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@ -23,7 +23,7 @@ class PCMPatchedTrack: public Track {
Constructs a @c PCMPatchedTrack that will return events from @c underlying_track in Constructs a @c PCMPatchedTrack that will return events from @c underlying_track in
regions where it has not had alternative PCM data installed. regions where it has not had alternative PCM data installed.
*/ */
PCMPatchedTrack(const PCMTrack &underlying_track); PCMPatchedTrack(Track &underlying_track);
/*! /*!
Replaces whatever is currently on the track from @c start_position to @c start_position + segment length Replaces whatever is currently on the track from @c start_position to @c start_position + segment length
@ -33,16 +33,17 @@ class PCMPatchedTrack: public Track {
// To satisfy Storage::Disk::Track // To satisfy Storage::Disk::Track
Event get_next_event(); Event get_next_event();
Time seek_to(Time time_since_index_hole); Time seek_to(const Time &time_since_index_hole);
private: private:
const PCMTrack &underlying_track_; Track &underlying_track_;
struct Patch { struct Patch {
Time start_position; Time start_position;
PCMSegment segment; PCMSegment segment;
Patch(const Time &start_position, const PCMSegment &segment) : start_position(start_position), segment(segment) {} Patch(const Time &start_position, const PCMSegment &segment) : start_position(start_position), segment(segment) {}
}; };
std::vector<Patch> patches_; std::vector<Patch> patches_;
size_t active_patch_;
}; };
} }

15
Storage/Disk/PCMTrack.cpp
View File

@ -25,7 +25,7 @@ PCMTrack::PCMTrack(PCMSegment segment)
fix_length(); fix_length();
} }
PCMTrack::Event PCMTrack::get_next_event() Track::Event PCMTrack::get_next_event()
{ {
// find the next 1 in the input stream, keeping count of length as we go, and assuming it's going // find the next 1 in the input stream, keeping count of length as we go, and assuming it's going
// to be a flux transition // to be a flux transition
@ -61,15 +61,16 @@ PCMTrack::Event PCMTrack::get_next_event()
return next_event_; return next_event_;
} }
Storage::Time PCMTrack::seek_to(Time time_since_index_hole) Storage::Time PCMTrack::seek_to(const Time &time_since_index_hole)
{ {
segment_pointer_ = 0; segment_pointer_ = 0;
// pick a common clock rate for counting time on this track and multiply up the time being sought appropriately // pick a common clock rate for counting time on this track and multiply up the time being sought appropriately
Time time_so_far; Time time_so_far;
time_so_far.clock_rate = NumberTheory::least_common_multiple(next_event_.length.clock_rate, time_since_index_hole.clock_rate); Time target_time = time_since_index_hole;
time_since_index_hole.length *= time_so_far.clock_rate / time_since_index_hole.clock_rate; time_so_far.clock_rate = NumberTheory::least_common_multiple(next_event_.length.clock_rate, target_time.clock_rate);
time_since_index_hole.clock_rate = time_so_far.clock_rate; target_time.length *= time_so_far.clock_rate / target_time.clock_rate;
target_time.clock_rate = time_so_far.clock_rate;
while(segment_pointer_ < segments_.size()) while(segment_pointer_ < segments_.size())
{ {
@ -79,7 +80,7 @@ Storage::Time PCMTrack::seek_to(Time time_since_index_hole)
unsigned int time_in_this_segment = bit_length * segments_[segment_pointer_].number_of_bits; unsigned int time_in_this_segment = bit_length * segments_[segment_pointer_].number_of_bits;
// if this segment goes on longer than the time being sought, end here // if this segment goes on longer than the time being sought, end here
unsigned int time_remaining = time_since_index_hole.length - time_so_far.length; unsigned int time_remaining = target_time.length - time_so_far.length;
if(time_in_this_segment >= time_remaining) if(time_in_this_segment >= time_remaining)
{ {
// get the amount of time actually to move into this segment // get the amount of time actually to move into this segment
@ -97,7 +98,7 @@ Storage::Time PCMTrack::seek_to(Time time_since_index_hole)
time_so_far.length += time_in_this_segment; time_so_far.length += time_in_this_segment;
segment_pointer_++; segment_pointer_++;
} }
return time_since_index_hole; return target_time;
} }
void PCMTrack::fix_length() void PCMTrack::fix_length()

2
Storage/Disk/PCMTrack.hpp
View File

@ -48,7 +48,7 @@ class PCMTrack: public Track {
// as per @c Track // as per @c Track
Event get_next_event(); Event get_next_event();
Time seek_to(Time time_since_index_hole); Time seek_to(const Time &time_since_index_hole);
private: private:
// storage for the segments that describe this track // storage for the segments that describe this track