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Adds support for ADL-format disk images.

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This commit is contained in:
Thomas Harte 2021-01-30 18:39:29 -05:00
parent 4bd6ffa9e4
commit ac95e4d758
3 changed files with 12 additions and 5 deletions
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1
Analyser/Static/StaticAnalyser.cpp
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@ -98,6 +98,7 @@ static Media GetMediaAndPlatforms(const std::string &file_name, TargetPlatform::
Format("81", result.tapes, Tape::ZX80O81P, TargetPlatform::ZX8081) // 81
Format("a26", result.cartridges, Cartridge::BinaryDump, TargetPlatform::Atari2600) // A26
Format("adf", result.disks, Disk::DiskImageHolder<Storage::Disk::AcornADF>, TargetPlatform::Acorn) // ADF
Format("adl", result.disks, Disk::DiskImageHolder<Storage::Disk::AcornADF>, TargetPlatform::Acorn) // ADL
Format("bin", result.cartridges, Cartridge::BinaryDump, TargetPlatform::AllCartridge) // BIN (cartridge dump)
Format("cas", result.tapes, Tape::CAS, TargetPlatform::MSX) // CAS
Format("cdt", result.tapes, Tape::TZX, TargetPlatform::AmstradCPC) // CDT

15
Storage/Disk/DiskImage/Formats/AcornADF.cpp
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@ -18,12 +18,13 @@ namespace {
using namespace Storage::Disk;
AcornADF::AcornADF(const std::string &file_name) : MFMSectorDump(file_name) {
// very loose validation: the file needs to be a multiple of 256 bytes
// and not ungainly large
// Check that the disk image contains a whole number of sector.
if(file_.stats().st_size % off_t(128 << sector_size)) throw Error::InvalidFormat;
// Check that the disk image is at least large enough to hold an ADFS catalogue.
if(file_.stats().st_size < 7 * off_t(128 << sector_size)) throw Error::InvalidFormat;
// check that the initial directory's 'Hugo's are present
// Check that the initial directory's 'Hugo's are present.
file_.seek(513, SEEK_SET);
uint8_t bytes[4];
file_.read(bytes, 4);
@ -33,6 +34,10 @@ AcornADF::AcornADF(const std::string &file_name) : MFMSectorDump(file_name) {
file_.read(bytes, 4);
if(bytes[0] != 'H' || bytes[1] != 'u' || bytes[2] != 'g' || bytes[3] != 'o') throw Error::InvalidFormat;
// Pick a number of heads; treat this image as double sided if it's too large to be single-sided.
head_count_ = 1 + (file_.stats().st_size > sectors_per_track * off_t(128 << sector_size) * 80);
// Announce disk geometry.
set_geometry(sectors_per_track, sector_size, 0, true);
}
@ -41,9 +46,9 @@ HeadPosition AcornADF::get_maximum_head_position() {
}
int AcornADF::get_head_count() {
return 1;
return head_count_;
}
long AcornADF::get_file_offset_for_position(Track::Address address) {
return address.position.as_int() * (128 << sector_size) * sectors_per_track;
return (address.position.as_int() * head_count_ + address.head) * (128 << sector_size) * sectors_per_track;
}

1
Storage/Disk/DiskImage/Formats/AcornADF.hpp
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@ -34,6 +34,7 @@ class AcornADF: public MFMSectorDump {
private:
long get_file_offset_for_position(Track::Address address) final;
int head_count_ = 1;
};
}