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Gaps provide content, and data chunk lengths seem to be in terms of unencoded bytes.

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This commit is contained in:
Thomas Harte 2022-01-01 18:47:07 -05:00
parent ed1b0b90f7
commit d031381e70
1 changed files with 27 additions and 15 deletions
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42
Storage/Disk/DiskImage/Formats/IPF.cpp
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@ -282,10 +282,13 @@ std::shared_ptr<Track> IPF::get_track_at_position([[maybe_unused]] Track::Addres
None, Sync, Data, Gap, Raw, Fuzzy
} type = Type(data_header & 0x1f);
const size_t length = block_size(file_, data_header) * (block.data_unit_is_bits ? 1 : 8);
#ifndef NDEBUG
const auto next_chunk = file_.tell() + long(length >> 3);
#endif
// TODO: write the data.
switch(type) {
case Type::Gap: {
/*case Type::Gap: {
auto &segment = segments.emplace_back();
segment.length_of_a_bit = length_of_a_bit;
segment.data.reserve(size_t(length + 31) & size_t(~31));
@ -297,24 +300,32 @@ std::shared_ptr<Track> IPF::get_track_at_position([[maybe_unused]] Track::Addres
encoder->add_byte(uint8_t(block.default_gap_value >> 0));
}
segment.data.resize(length);
} break;
} break;*/
case Type::Data: {
printf("Handling data type %d, length %zu bits\n", int(type), length);
auto &segment = segments.emplace_back();
segment.length_of_a_bit = length_of_a_bit;
// Length appears to be in pre-encoded bits; double that to get encoded bits.
const auto byte_length = (length + 7) >> 3;
segment.data.reserve(byte_length * 2);
auto encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
for(size_t c = 0; c < (length >> 3); c++) {
encoder->add_byte(file_.get8());
}
segment.data.resize(length * 2);
} break;
case Type::Gap:
case Type::Sync:
case Type::Raw: {
printf("Handling data type %d, length %zu bits\n", int(type), length);
auto &segment = segments.emplace_back();
segment.length_of_a_bit = length_of_a_bit;
segment.data.reserve(size_t(length + 7) & size_t(~7));
auto encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
while(segment.data.size() < length) {
encoder->add_byte(file_.get8());
}
segment.data.resize(length);
} break;
case Type::Sync:
case Type::Raw: {
auto &segment = segments.emplace_back();
segment.length_of_a_bit = length_of_a_bit;
segment.data.reserve(length);
for(size_t bit = 0; bit < length; bit += 8) {
const uint8_t next = file_.get8();
@ -333,9 +344,10 @@ std::shared_ptr<Track> IPF::get_track_at_position([[maybe_unused]] Track::Addres
default:
printf("Unhandled data type %d, length %zu bits\n", int(type), length);
file_.seek(long(length >> 3), SEEK_CUR);
break;
}
assert(file_.tell() == next_chunk);
}
}