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Fixed Oric .DSK handling, per my latest understanding. Which creates a desire to write shorts directly to the disk surface, so exposed that in the encoder.

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This commit is contained in:
Thomas Harte 2016-12-28 18:50:28 -05:00
parent 90151e2094
commit 3a9ad3fb08
2 changed files with 35 additions and 20 deletions
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2
Storage/Disk/Encodings/MFM.hpp
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@ -48,10 +48,10 @@ class Encoder {
virtual void add_ID_address_mark() = 0;
virtual void add_data_address_mark() = 0;
virtual void add_deleted_data_address_mark() = 0;
virtual void output_short(uint16_t value);
void add_crc();
protected:
virtual void output_short(uint16_t value);
NumberTheory::CRC16 crc_generator_;
private:

53
Storage/Disk/Formats/OricMFMDSK.cpp
View File

@ -57,6 +57,7 @@ std::shared_ptr<Track> OricMFMDSK::get_uncached_track_at_position(unsigned int h
size_t track_offset = 0;
uint8_t last_header[6];
std::unique_ptr<Encodings::MFM::Encoder> encoder = Encodings::MFM::GetMFMEncoder(segment.data);
bool did_sync = false;
while(track_offset < 6250)
{
uint8_t next_byte = (uint8_t)fgetc(file_);
@ -65,32 +66,46 @@ std::shared_ptr<Track> OricMFMDSK::get_uncached_track_at_position(unsigned int h
switch(next_byte)
{
default:
encoder->add_byte(next_byte);
break;
case 0xfe: // an ID synchronisation
{
encoder->add_ID_address_mark();
for(int byte = 0; byte < 6; byte++)
encoder->add_byte(next_byte);
if(did_sync)
{
last_header[byte] = (uint8_t)fgetc(file_);
encoder->add_byte(last_header[byte]);
track_offset++;
if(track_offset == 6250) break;
switch(next_byte)
{
default: break;
case 0xfe:
for(int byte = 0; byte < 6; byte++)
{
last_header[byte] = (uint8_t)fgetc(file_);
encoder->add_byte(last_header[byte]);
track_offset++;
if(track_offset == 6250) break;
}
break;
case 0xfb:
for(int byte = 0; byte < (128 << last_header[3]) + 2; byte++)
{
encoder->add_byte((uint8_t)fgetc(file_));
track_offset++;
if(track_offset == 6250) break;
}
break;
}
}
did_sync = false;
}
break;
case 0xfb: // a data synchronisation
encoder->add_data_address_mark();
case 0xa1: // a synchronisation mark that implies a sector or header coming
encoder->output_short(Storage::Encodings::MFM::MFMSync);
did_sync = true;
break;
for(int byte = 0; byte < (128 << last_header[3]) + 2; byte++)
{
encoder->add_byte((uint8_t)fgetc(file_));
track_offset++;
if(track_offset == 6250) break;
}
case 0xc2: // an 'ordinary' synchronisation mark
encoder->output_short(Storage::Encodings::MFM::MFMIndexSync);
break;
}
}