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With some refactoring makes some minor steps towards supporting gaps.

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This commit is contained in:
Thomas Harte 2022-01-06 17:24:31 -05:00
parent f37179d9f2
commit 18b6f17e86
2 changed files with 77 additions and 62 deletions
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131
Storage/Disk/DiskImage/Formats/IPF.cpp
View File

@ -8,7 +8,6 @@
#include "IPF.hpp"
#include "../../Track/PCMTrack.hpp"
#include "../../Encodings/MFM/Encoder.hpp"
#include <cassert>
@ -258,19 +257,22 @@ std::shared_ptr<Track> IPF::get_track_at_position([[maybe_unused]] Track::Addres
} type = Type(gap_header & 0x1f);
const size_t length = block_size(file_, gap_header);
// TODO: write the gap.
switch(type) {
case Type::GapLength:
printf("Unhandled gap length %zu bytes\n", length);
printf("Adding gap length %zu bits\n", length);
add_gap(segments, length_of_a_bit, length, block.default_gap_value);
break;
default:
case Type::SampleLength:
printf("Unhandled sampled gap length %zu bytes\n", length);
file_.seek(long(length >> 3), SEEK_CUR);
printf("Adding sampled gap length %zu bits\n", length);
add_raw_data(segments, length_of_a_bit, length);
// file_.seek(long(length >> 3), SEEK_CUR);
break;
}
}
} else if(block.gap_bits) {
add_gap(segments, length_of_a_bit, block.gap_bits, block.default_gap_value);
}
if(block.data_offset) {
@ -288,65 +290,16 @@ std::shared_ptr<Track> IPF::get_track_at_position([[maybe_unused]] Track::Addres
const auto next_chunk = file_.tell() + long(length >> 3);
#endif
// TODO: write the data.
switch(type) {
/*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));
auto encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
while(segment.data.size() < length) {
encoder->add_byte(uint8_t(block.default_gap_value >> 24));
encoder->add_byte(uint8_t(block.default_gap_value >> 16));
encoder->add_byte(uint8_t(block.default_gap_value >> 8));
encoder->add_byte(uint8_t(block.default_gap_value >> 0));
}
segment.data.resize(length);
} break;*/
case Type::Gap:
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 * 16);
auto encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
for(size_t c = 0; c < length; c += 8) {
encoder->add_byte(file_.get8());
}
assert(segment.data.size() <= (byte_length * 16));
segment.data.resize(length * 2);
} break;
case Type::Data:
add_unencoded_data(segments, length_of_a_bit, length);
break;
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;
const auto bit_length = size_t(length + 7) & size_t(~7);
segment.data.reserve(bit_length);
for(size_t bit = 0; bit < length; bit += 8) {
const uint8_t next = file_.get8();
segment.data.push_back(next & 0x80);
segment.data.push_back(next & 0x40);
segment.data.push_back(next & 0x20);
segment.data.push_back(next & 0x10);
segment.data.push_back(next & 0x08);
segment.data.push_back(next & 0x04);
segment.data.push_back(next & 0x02);
segment.data.push_back(next & 0x01);
}
assert(segment.data.size() <= bit_length);
segment.data.resize(length);
} break;
case Type::Raw:
add_raw_data(segments, length_of_a_bit, length);
break;
default:
printf("Unhandled data type %d, length %zu bits\n", int(type), length);
@ -424,3 +377,61 @@ Storage::Time IPF::bit_length(TrackDescription::Density density, int block) {
return us200; // i.e. default to 2µs.
}
void IPF::add_gap(std::vector<Storage::Disk::PCMSegment> &track, Time bit_length, size_t num_bits, uint32_t value) {
auto &segment = track.emplace_back();
segment.length_of_a_bit = bit_length;
// Empirically, I think gaps require MFM encoding.
const auto byte_length = (num_bits + 7) >> 3;
segment.data.reserve(byte_length * 16);
auto encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
while(segment.data.size() < num_bits) {
encoder->add_byte(uint8_t(value >> 24));
value = (value << 8) | (value >> 24);
}
assert(segment.data.size() <= (byte_length * 16));
segment.data.resize(num_bits);
}
void IPF::add_unencoded_data(std::vector<Storage::Disk::PCMSegment> &track, Time bit_length, size_t num_bits) {
auto &segment = track.emplace_back();
segment.length_of_a_bit = bit_length;
// Length appears to be in pre-encoded bits; double that to get encoded bits.
const auto byte_length = (num_bits + 7) >> 3;
segment.data.reserve(num_bits * 16);
auto encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
for(size_t c = 0; c < num_bits; c += 8) {
encoder->add_byte(file_.get8());
}
assert(segment.data.size() <= (byte_length * 16));
segment.data.resize(num_bits * 2);
}
void IPF::add_raw_data(std::vector<Storage::Disk::PCMSegment> &track, Time bit_length, size_t num_bits) {
auto &segment = track.emplace_back();
segment.length_of_a_bit = bit_length;
const auto num_bits_ceiling = size_t(num_bits + 7) & size_t(~7);
segment.data.reserve(num_bits_ceiling);
for(size_t bit = 0; bit < num_bits; bit += 8) {
const uint8_t next = file_.get8();
segment.data.push_back(next & 0x80);
segment.data.push_back(next & 0x40);
segment.data.push_back(next & 0x20);
segment.data.push_back(next & 0x10);
segment.data.push_back(next & 0x08);
segment.data.push_back(next & 0x04);
segment.data.push_back(next & 0x02);
segment.data.push_back(next & 0x01);
}
assert(segment.data.size() <= num_bits_ceiling);
segment.data.resize(num_bits);
}

8
Storage/Disk/DiskImage/Formats/IPF.hpp
View File

@ -10,6 +10,7 @@
#define IPF_hpp
#include "../DiskImage.hpp"
#include "../../Track/PCMTrack.hpp"
#include "../../../FileHolder.hpp"
#include "../../../TargetPlatforms.hpp"
@ -68,8 +69,6 @@ class IPF: public DiskImage, public TargetPlatform::TypeDistinguisher {
bool has_fuzzy_bits = false;
};
Time bit_length(TrackDescription::Density, int block);
int head_count_;
int track_count_;
std::map<Track::Address, TrackDescription> tracks_;
@ -79,6 +78,11 @@ class IPF: public DiskImage, public TargetPlatform::TypeDistinguisher {
return TargetPlatform::Type(platform_type_);
}
TargetPlatform::IntType platform_type_ = TargetPlatform::Amiga;
Time bit_length(TrackDescription::Density, int block);
void add_gap(std::vector<Storage::Disk::PCMSegment> &, Time bit_length, size_t num_bits, uint32_t value);
void add_unencoded_data(std::vector<Storage::Disk::PCMSegment> &, Time bit_length, size_t num_bits);
void add_raw_data(std::vector<Storage::Disk::PCMSegment> &, Time bit_length, size_t num_bits);
};
}