mirror of https://github.com/zellyn/diskii.git
128 lines
3.8 KiB
Go
128 lines
3.8 KiB
Go
// Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
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package cmd
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import (
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"fmt"
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"io"
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"os"
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"github.com/zellyn/diskii/disk"
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"github.com/zellyn/diskii/helpers"
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"github.com/zellyn/diskii/types"
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)
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// SDCmd is the kong `mksd` command.
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type SDCmd struct {
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Order types.DiskOrder `kong:"default='auto',enum='auto,do,po',help='Logical-to-physical sector order.'"`
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DiskImage string `kong:"arg,required,type='path',help='Disk image to write.'"`
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Binary *os.File `kong:"arg,required,help='Binary file to write to the disk.'"`
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Address uint16 `kong:"type='anybaseuint16',default='0x6000',help='Address to load the code at.'"`
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Start uint16 `kong:"type='anybaseuint16',default='0xFFFF',help='Address to jump to. Defaults to 0xFFFF, which means “same as address flag”'"`
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}
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// Help displays extended help and examples.
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func (s SDCmd) Help() string {
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return `
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See https://github.com/peterferrie/standard-delivery for details.
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Examples:
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# Load and run foo.o at the default address, then jump to the start of the loaded code.
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diskii mksd test.dsk foo.o
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# Load foo.o at address 0x2000, then jump to 0x2100.
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diskii mksd test.dsk foo.o --address 0x2000 --start 0x2100`
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}
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// Run the `mksd` command.
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func (s *SDCmd) Run(globals *types.Globals) error {
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if s.Start == 0xFFFF {
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s.Start = s.Address
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}
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contents, err := io.ReadAll(s.Binary)
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if err != nil {
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return err
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}
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if s.Address%256 != 0 {
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return fmt.Errorf("address %d (%04X) not on a page boundary", s.Address, s.Address)
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}
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if s.Start < s.Address {
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return fmt.Errorf("start address %d (%04X) < load address %d (%04X)", s.Start, s.Start, s.Address, s.Address)
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}
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if int(s.Start) >= int(s.Address)+len(contents) {
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end := int(s.Address) + len(contents)
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return fmt.Errorf("start address %d (%04X) is beyond load address %d (%04X) + file length = %d (%04X)",
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s.Start, s.Start, s.Address, s.Address, end, end)
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}
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if int(s.Start)+len(contents) > 0xC000 {
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end := int(s.Start) + len(contents)
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return fmt.Errorf("start address %d (%04X) + file length %d (%04X) = %d (%04X), but we can't load past page 0xBF00",
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s.Start, s.Start, len(contents), len(contents), end, end)
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}
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sectors := (len(contents) + 255) / 256
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loader := []byte{
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0x01, 0xa8, 0xee, 0x06, 0x08, 0xad, 0x4e, 0x08, 0xc9, 0xc0, 0xf0, 0x40, 0x85, 0x27, 0xc8,
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0xc0, 0x10, 0x90, 0x09, 0xf0, 0x05, 0x20, 0x2f, 0x08, 0xa8, 0x2c, 0xa0, 0x01, 0x84, 0x3d,
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0xc8, 0xa5, 0x27, 0xf0, 0xdf, 0x8a, 0x4a, 0x4a, 0x4a, 0x4a, 0x09, 0xc0, 0x48, 0xa9, 0x5b,
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0x48, 0x60, 0xe6, 0x41, 0x06, 0x40, 0x20, 0x37, 0x08, 0x18, 0x20, 0x3c, 0x08, 0xe6, 0x40,
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0xa5, 0x40, 0x29, 0x03, 0x2a, 0x05, 0x2b, 0xa8, 0xb9, 0x80, 0xc0, 0xa9, 0x30, 0x4c, 0xa8,
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0xfc, 0x4c, byte(s.Start), byte(s.Start >> 8),
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}
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if len(loader)+sectors+1 > 256 {
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return fmt.Errorf("file %q is %d bytes long, max is %d", s.Binary.Name(), len(contents), (255-len(loader))*256)
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}
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for len(contents)%256 != 0 {
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contents = append(contents, 0)
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}
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diskbytes := make([]byte, disk.FloppyDiskBytes)
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var track, sector byte
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for i := 0; i < len(contents); i += 256 {
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sector += 2
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if sector >= disk.FloppySectors {
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sector = (disk.FloppySectors + 1) - sector
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if sector == 0 {
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track++
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if track >= disk.FloppyTracks {
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return fmt.Errorf("ran out of tracks")
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}
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}
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}
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address := int(s.Address) + i
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loader = append(loader, byte(address>>8))
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if err := disk.WriteSector(diskbytes, track, sector, contents[i:i+256]); err != nil {
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return err
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}
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}
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loader = append(loader, 0xC0)
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for len(loader) < 256 {
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loader = append(loader, 0)
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}
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if err := disk.WriteSector(diskbytes, 0, 0, loader); err != nil {
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return err
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}
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order := s.Order
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if order == types.DiskOrderAuto {
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order = disk.OrderFromFilename(s.DiskImage, types.DiskOrderDO)
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}
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rawBytes, err := disk.Swizzle(diskbytes, disk.PhysicalToLogicalByName[order])
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if err != nil {
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return err
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}
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return helpers.WriteOutput(s.DiskImage, rawBytes, true)
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}
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