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Implemented some portion of 0114; ensured I'm safely skipping chunks in all cases.

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This commit is contained in:
Thomas Harte 2016-02-20 22:18:00 -05:00
parent ec3cccbb0d
commit f7fc7cb932
2 changed files with 28 additions and 3 deletions
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27
Storage/Tape/Formats/TapeUEF.cpp
View File

@ -63,6 +63,7 @@ Storage::UEF::UEF(const char *file_name) :
throw ErrorNotUEF;
}
_start_of_next_chunk = gztell(_file);
find_next_tape_chunk();
}
@ -104,6 +105,7 @@ Storage::Tape::Pulse Storage::UEF::get_next_pulse()
_bit_position = (_bit_position+1)&(_current_bit ? 3 : 1);
} break;
case 0x0114:
case 0x0110:
next_pulse.type = (_bit_position&1) ? Pulse::High : Pulse::Low;
next_pulse.length.length = 1;
@ -130,8 +132,11 @@ void Storage::UEF::find_next_tape_chunk()
_chunk_position = 0;
_bit_position = 0;
while(1)
{
gzseek(_file, _start_of_next_chunk, SEEK_SET);
// read chunk ID
_chunk_id = (uint16_t)gzgetc(_file);
_chunk_id |= (uint16_t)(gzgetc(_file) << 8);
@ -141,6 +146,8 @@ void Storage::UEF::find_next_tape_chunk()
_chunk_length |= (uint32_t)(gzgetc(_file) << 16);
_chunk_length |= (uint32_t)(gzgetc(_file) << 24);
_start_of_next_chunk = gztell(_file) + _chunk_length;
if(gzeof(_file))
{
reset_count++;
@ -174,11 +181,23 @@ void Storage::UEF::find_next_tape_chunk()
_chunk_duration.length |= (uint16_t)(gzgetc(_file) << 8);
gzseek(_file, _chunk_length - 2, SEEK_CUR);
return;
case 0x0111: // carrier tone with dummy byte
// case 0x0111: // carrier tone with dummy byte
// TODO: read lengths
return;
// return;
case 0x0114: // security cycles
// TODO: read number, Ps and Ws
// read number of cycles
_chunk_duration.length = (uint32_t)gzgetc(_file);
_chunk_duration.length |= (uint32_t)gzgetc(_file) << 8;
_chunk_duration.length |= (uint32_t)gzgetc(_file) << 16;
// Ps and Ws
_first_is_pulse = gzgetc(_file) == 'P';
_last_is_pulse = gzgetc(_file) == 'P';
if(_first_is_pulse)
_bit_position ^= 1;
// TODO: last is pulse
break;
case 0x113: // change of base rate
@ -202,6 +221,7 @@ bool Storage::UEF::chunk_is_finished()
{
case 0x0100: return (_chunk_position / 10) == _chunk_length;
case 0x0102: return (_chunk_position / 8) == _chunk_length;
case 0x0114:
case 0x0110: return _chunk_position == _chunk_duration.length;
case 0x0112:
@ -231,6 +251,7 @@ bool Storage::UEF::get_next_bit()
}
break;
case 0x0114:
case 0x0102:
{
uint32_t bit_position = _chunk_position%8;

4
Storage/Tape/Formats/TapeUEF.hpp
View File

@ -30,6 +30,7 @@ class UEF : public Tape {
private:
gzFile _file;
unsigned int _time_base;
z_off_t _start_of_next_chunk;
uint16_t _chunk_id;
uint32_t _chunk_length;
@ -42,6 +43,9 @@ class UEF : public Tape {
Time _chunk_duration;
bool _first_is_pulse;
bool _last_is_pulse;
void find_next_tape_chunk();
bool get_next_bit();
bool chunk_is_finished();