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Made a first attempt at HFE support.

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This commit is contained in:
Thomas Harte 2017-08-17 22:20:02 -04:00
parent e6683e7f2d
commit c8c1792c3f
2 changed files with 35 additions and 2 deletions
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36
Storage/Disk/Formats/HFE.cpp
View File

@ -8,11 +8,20 @@
#include "HFE.hpp"
#include "../PCMTrack.hpp"
using namespace Storage::Disk;
HFE::HFE(const char *file_name) :
Storage::FileHolder(file_name) {
throw ErrorNotHFE;
if(!check_signature("HXCPICFE", 8)) throw ErrorNotHFE;
if(fgetc(file_)) throw ErrorNotHFE;
track_count_ = (unsigned int)fgetc(file_);
head_count_ = (unsigned int)fgetc(file_);
fseek(file_, 7, SEEK_CUR);
track_list_offset_ = (long)fgetc16le() << 9;
}
HFE::~HFE() {
@ -31,5 +40,28 @@ bool HFE::get_is_read_only() {
}
std::shared_ptr<Track> HFE::get_uncached_track_at_position(unsigned int head, unsigned int position) {
return nullptr;
// Get track position and length from the lookup table; data is then always interleaved
// based on an assumption of two heads.
fseek(file_, track_list_offset_ + position * 4, SEEK_SET);
long track_offset = (long)fgetc16le() << 9;
uint16_t track_length = fgetc16le();
fseek(file_, track_offset, SEEK_SET);
if(head) fseek(file_, 256, SEEK_CUR);
PCMSegment segment;
uint16_t side_length = track_length / 2;
segment.data.resize(side_length);
uint16_t c = 0;
while(c < side_length) {
uint16_t length = (uint16_t)std::min(256, side_length - c);
fread(&segment.data[c], 1, length, file_);
c += length;
fseek(file_, 256, SEEK_CUR);
}
std::shared_ptr<Track> track(new PCMTrack(segment));
return track;
}

1
Storage/Disk/Formats/HFE.hpp
View File

@ -43,6 +43,7 @@ class HFE: public Disk, public Storage::FileHolder {
unsigned int head_count_;
unsigned int track_count_;
long track_list_offset_;
};
}