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This gets through loading the first(/only?) copy. I tried repeating it with a bit-flipped header, now I'm trying repeating the header with a different file type. More documentation searching to do, I guess.

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This commit is contained in:
Thomas Harte 2016-08-16 22:17:08 -04:00
parent 1bca9aa2bb
commit e5523dbbed
2 changed files with 21 additions and 5 deletions
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24
Storage/Tape/Formats/TapePRG.cpp
View File

@ -12,7 +12,7 @@
using namespace Storage;
TapePRG::TapePRG(const char *file_name) : _file(nullptr), _bitPhase(3), _filePhase(FilePhaseLeadIn), _phaseOffset(0)
TapePRG::TapePRG(const char *file_name) : _file(nullptr), _bitPhase(3), _filePhase(FilePhaseLeadIn), _phaseOffset(0), _file_type(0x03)
{
struct stat file_stats;
stat(file_name, &file_stats);
@ -29,6 +29,9 @@ TapePRG::TapePRG(const char *file_name) : _file(nullptr), _bitPhase(3), _filePha
_load_address |= (uint16_t)fgetc(_file) << 8;
_length = (uint16_t)(file_stats.st_size - 2);
fseek(_file, 2, SEEK_SET);
if (_load_address + _length >= 65536)
throw ErrorBadFormat;
}
@ -69,6 +72,7 @@ void TapePRG::reset()
fseek(_file, 2, SEEK_SET);
_filePhase = FilePhaseLeadIn;
_phaseOffset = 0;
_file_type = 0x03;
}
void TapePRG::get_next_output_token()
@ -98,9 +102,19 @@ void TapePRG::get_next_output_token()
if(byte_offset == block_length + countdown_bytes + 1) // i.e. after the checksum
{
_phaseOffset = 0;
_filePhase = FilePhaseData; // TODO
_outputToken = EndOfBlock;
_phaseOffset = 0;
if(feof(_file))
{
_file_type ^= 0x5 ^ 0x3;
_filePhase = (_file_type == 0x5) ? FilePhaseHeader : FilePhaseLeadIn;
fseek(_file, 2, SEEK_SET);
}
else
{
_filePhase = FilePhaseData;
}
printf("\n===\n");
return;
}
@ -123,7 +137,7 @@ void TapePRG::get_next_output_token()
{
switch(byte_offset - countdown_bytes)
{
case 0: _output_byte = 0x03; break;
case 0: _output_byte = _file_type; break;
case 1: _output_byte = _load_address & 0xff; break;
case 2: _output_byte = (_load_address >> 8)&0xff; break;
case 3: _output_byte = (_load_address + _length) & 0xff; break;
@ -140,7 +154,7 @@ void TapePRG::get_next_output_token()
else
{
_output_byte = (uint8_t)fgetc(_file);
if(feof(_file)) _output_byte = 0x20;
if(feof(_file)) _output_byte = 0x00;
}
_check_digit ^= _output_byte;

2
Storage/Tape/Formats/TapePRG.hpp
View File

@ -59,6 +59,8 @@ class TapePRG: public Tape {
void get_next_output_token();
uint8_t _output_byte;
uint8_t _check_digit;
// uint8_t _copy_mask;
uint8_t _file_type;
};
}