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diskm8
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diskm8/disk/diskimage.go

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package disk
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
)
//import "math/rand"
const STD_BYTES_PER_SECTOR = 256
const STD_TRACKS_PER_DISK = 35
const STD_SECTORS_PER_TRACK = 16
const STD_SECTORS_PER_TRACK_OLD = 13
const STD_DISK_BYTES = STD_TRACKS_PER_DISK * STD_SECTORS_PER_TRACK * STD_BYTES_PER_SECTOR
const STD_DISK_BYTES_OLD = STD_TRACKS_PER_DISK * STD_SECTORS_PER_TRACK_OLD * STD_BYTES_PER_SECTOR
const PRODOS_800KB_BLOCKS = 1600
const PRODOS_800KB_DISK_BYTES = STD_BYTES_PER_SECTOR * 2 * PRODOS_800KB_BLOCKS
const PRODOS_400KB_BLOCKS = 800
const PRODOS_400KB_DISK_BYTES = STD_BYTES_PER_SECTOR * 2 * PRODOS_400KB_BLOCKS
const PRODOS_SECTORS_PER_BLOCK = 2
const PRODOS_BLOCKS_PER_TRACK = 8
const PRODOS_800KB_BLOCKS_PER_TRACK = 20
const PRODOS_BLOCKS_PER_DISK = 280
const PRODOS_ENTRY_SIZE = 39
const TRACK_NIBBLE_LENGTH = 0x1A00
const TRACK_COUNT = STD_TRACKS_PER_DISK
const SECTOR_COUNT = STD_SECTORS_PER_TRACK
const HALF_TRACK_COUNT = TRACK_COUNT * 2
const DISK_NIBBLE_LENGTH = TRACK_NIBBLE_LENGTH * TRACK_COUNT
const DISK_PLAIN_LENGTH = STD_DISK_BYTES
const DISK_2MG_NON_NIB_LENGTH = DISK_PLAIN_LENGTH + 0x040
const DISK_2MG_NIB_LENGTH = DISK_NIBBLE_LENGTH + 0x040
type DSKContainer []byte
func Checksum(b []byte) string {
sum := sha256.Sum256(b)
return hex.EncodeToString(sum[:])
}
type SectorOrder int
var DOS_33_SECTOR_ORDER = []int{
0x00, 0x07, 0x0E, 0x06, 0x0D, 0x05, 0x0C, 0x04,
0x0B, 0x03, 0x0A, 0x02, 0x09, 0x01, 0x08, 0x0F,
}
var DOS_32_SECTOR_ORDER = []int{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C,
}
var PRODOS_SECTOR_ORDER = []int{
0x00, 0x08, 0x01, 0x09, 0x02, 0x0a, 0x03, 0x0b,
0x04, 0x0c, 0x05, 0x0d, 0x06, 0x0e, 0x07, 0x0f,
}
var LINEAR_SECTOR_ORDER = []int{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
}
var NIBBLE_62 = []byte{
0x96, 0x97, 0x9a, 0x9b, 0x9d, 0x9e, 0x9f, 0xa6,
0xa7, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb2, 0xb3,
0xb4, 0xb5, 0xb6, 0xb7, 0xb9, 0xba, 0xbb, 0xbc,
0xbd, 0xbe, 0xbf, 0xcb, 0xcd, 0xce, 0xcf, 0xd3,
0xd6, 0xd7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde,
0xdf, 0xe5, 0xe6, 0xe7, 0xe9, 0xea, 0xeb, 0xec,
0xed, 0xee, 0xef, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6,
0xf7, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}
var NIBBLE_53 = []byte{
0xab, 0xad, 0xae, 0xaf, 0xb5, 0xb6, 0xb7, 0xba,
0xbb, 0xbd, 0xbe, 0xbf, 0xd6, 0xd7, 0xda, 0xdb,
0xdd, 0xde, 0xdf, 0xea, 0xeb, 0xed, 0xee, 0xef,
0xf5, 0xf6, 0xf7, 0xfa, 0xfb, 0xfd, 0xfe, 0xff,
}
var identity = map[string]DiskFormat{
"99b900080a0a0a990008c8d0f4a62ba9098527adcc03854184408a4a4a4a4a09": GetDiskFormat(DF_DOS_SECTORS_13),
"01a527c909d018a52b4a4a4a4a09c0853fa95c853e18adfe086dff088dfe08ae": GetDiskFormat(DF_DOS_SECTORS_16),
"0138b0034c32a18643c903088a29704a4a4a4a09c08549a0ff844828c8b148d0": GetDiskFormat(DF_PRODOS),
}
const (
SectorOrderDOS33 SectorOrder = iota
SectorOrderDOS32
SectorOrderDOS33Alt
SectorOrderProDOS
SectorOrderProDOSLinear
)
func (so SectorOrder) String() string {
switch so {
case SectorOrderDOS32:
return "DOS"
case SectorOrderDOS33:
return "DOS"
case SectorOrderDOS33Alt:
return "DOS Alternate"
case SectorOrderProDOS:
return "ProDOS"
case SectorOrderProDOSLinear:
return "Linear"
}
return "Linear"
}
type DiskFormatID int
const (
DF_NONE DiskFormatID = iota
DF_DOS_SECTORS_13
DF_DOS_SECTORS_16
DF_PRODOS
DF_PRODOS_800KB
DF_PASCAL
DF_RDOS_3
DF_RDOS_32
DF_RDOS_33
DF_PRODOS_400KB
DF_PRODOS_CUSTOM
)
type DiskFormat struct {
ID DiskFormatID
bpd int
spt int
uspt int
tpd int
}
func GetDiskFormat(id DiskFormatID) DiskFormat {
return DiskFormat{ID: id}
}
func GetPDDiskFormat(id DiskFormatID, blocks int) DiskFormat {
return DiskFormat{
ID: id,
bpd: blocks,
tpd: 80,
spt: blocks / 80,
uspt: blocks / 80,
}
}
func (f DiskFormat) String() string {
switch f.ID {
case DF_NONE:
return "Unrecognized"
case DF_DOS_SECTORS_13:
return "Apple DOS 13 Sector"
case DF_DOS_SECTORS_16:
return "Apple DOS 16 Sector"
case DF_PRODOS:
return "ProDOS"
case DF_PASCAL:
return "Pascal"
case DF_PRODOS_400KB:
return "ProDOS 400Kb"
case DF_PRODOS_800KB:
return "ProDOS 800Kb"
case DF_RDOS_3:
return "SSI RDOS 3 (16/13/Physical)"
case DF_RDOS_32:
return "SSI RDOS 32 (13/13/Physical)"
case DF_RDOS_33:
return "SSI RDOS 32 (16/16/PD)"
case DF_PRODOS_CUSTOM:
return fmt.Sprintf("ProDOS Custom (%d SPT, %d TPD)", f.SPT(), f.TPD())
}
return "Unrecognized"
}
func (df DiskFormat) BPD() int {
switch df.ID {
case DF_RDOS_3:
return 222
case DF_RDOS_32:
return 222
case DF_RDOS_33:
return 280
case DF_DOS_SECTORS_13:
return 222
case DF_DOS_SECTORS_16:
return 280
case DF_PRODOS:
return 280
case DF_PASCAL:
return 280
case DF_PRODOS_800KB:
return 1600
case DF_PRODOS_400KB:
return 800
case DF_PRODOS_CUSTOM:
return df.bpd
}
return 16 // fallback
}
func (df DiskFormat) USPT() int {
switch df.ID {
case DF_RDOS_3:
return 13
case DF_RDOS_32:
return 13
case DF_RDOS_33:
return 16
case DF_DOS_SECTORS_13:
return 13
case DF_DOS_SECTORS_16:
return 16
case DF_PRODOS:
return 16
case DF_PASCAL:
return 16
case DF_PRODOS_800KB:
return 40
case DF_PRODOS_400KB:
return 20
case DF_PRODOS_CUSTOM:
return df.uspt
}
return 16 // fallback
}
func (df DiskFormat) SPT() int {
switch df.ID {
case DF_RDOS_3:
return 16
case DF_RDOS_32:
return 13
case DF_RDOS_33:
return 16
case DF_DOS_SECTORS_13:
return 13
case DF_DOS_SECTORS_16:
return 16
case DF_PRODOS:
return 16
case DF_PASCAL:
return 16
case DF_PRODOS_800KB:
return 40
case DF_PRODOS_400KB:
return 20
case DF_PRODOS_CUSTOM:
return df.spt
}
return 16 // fallback
}
func (df DiskFormat) TPD() int {
switch df.ID {
case DF_RDOS_3:
return 35
case DF_RDOS_32:
return 35
case DF_RDOS_33:
return 35
case DF_DOS_SECTORS_13:
return 35
case DF_DOS_SECTORS_16:
return 35
case DF_PRODOS:
return 35
case DF_PASCAL:
return 35
case DF_PRODOS_800KB:
return 80
case DF_PRODOS_400KB:
return 80
case DF_PRODOS_CUSTOM:
return df.tpd
}
return 35 // fallback
}
type Nibbler interface {
SetNibble(offset int, value byte)
GetNibble(offset int) byte
}
type DSKWrapper struct {
Data DSKContainer
Layout SectorOrder
CurrentTrack int
CurrentSector int
SectorPointer int
Format DiskFormat
RDOSFormat RDOSFormat
Filename string
//Nibbles []byte
Nibbles Nibbler
CurrentSectorOrder []int
WriteProtected bool
NibblesChanged bool
}
// SectoreMapperDOS33 handles the interleaving for dos sectors
func SectorMapperDOS33(wanted int) int {
return wanted
switch wanted {
case 0:
return 0
case 13:
return 1
case 11:
return 2
case 9:
return 3
case 7:
return 4
case 5:
return 5
case 3:
return 6
case 1:
return 7
case 14:
return 8
case 12:
return 9
case 10:
return 10
case 8:
return 11
case 6:
return 12
case 4:
return 13
case 2:
return 14
case 15:
return 15
}
return -1 // invalid sector
}
func SectorMapperDOS33Alt(wanted int) int {
switch wanted {
case 0:
return 0
case 13:
return 1
case 11:
return 2
case 9:
return 3
case 7:
return 4
case 5:
return 5
case 3:
return 6
case 1:
return 7
case 14:
return 8
case 12:
return 9
case 10:
return 10
case 8:
return 11
case 6:
return 12
case 4:
return 13
case 2:
return 14
case 15:
return 15
}
return -1 // invalid sector
}
func SectorMapperDOS33bad(wanted int) int {
return wanted
switch wanted {
case 0:
return 0
case 1:
return 13
case 2:
return 11
case 3:
return 9
case 4:
return 7
case 5:
return 5
case 6:
return 3
case 7:
return 1
case 8:
return 14
case 9:
return 12
case 10:
return 10
case 11:
return 8
case 12:
return 6
case 13:
return 4
case 14:
return 2
case 15:
return 15
}
return -1 // invalid sector
}
// SectoreMapperProDOS handles the interleaving for dos sectors
func SectorMapperProDOS(wanted int) int {
switch wanted {
case 0:
return 0
case 1:
return 2
case 2:
return 4
case 3:
return 6
case 4:
return 8
case 5:
return 10
case 6:
return 12
case 7:
return 14
case 8:
return 1
case 9:
return 3
case 10:
return 5
case 11:
return 7
case 12:
return 9
case 13:
return 11
case 14:
return 13
case 15:
return 15
}
return -1 // invalid sector
}
func (d *DSKWrapper) SetTrack(t int) error {
if t >= 0 && t < d.Format.TPD() {
d.CurrentTrack = t
d.SetSectorPointer()
return nil
}
return errors.New("Invalid track")
}
// SetSector changes the sector we are looking at
func (d *DSKWrapper) SetSector(s int) error {
if s >= 0 && s < d.Format.USPT() {
d.CurrentSector = s
d.SetSectorPointer()
return nil
}
return errors.New("Invalid sector")
}
func (d *DSKWrapper) HuntVTOC(t, s int) (int, int) {
for block := 0; block < len(d.Data)/256; block++ {
data := d.Data[block*256 : block*256+256]
var v VTOC
v.SetData(data, (block / s), (block % s))
if v.GetTracks() == t && v.GetSectors() == s {
return (block / s), (block % s)
}
}
return -1, -1
}
// SetSectorPointer calculates the pointer to the current sector, taking into
// account the sector interleaving of the DSK image.
func (d *DSKWrapper) SetSectorPointer() {
track := d.CurrentTrack
sector := d.CurrentSector
isector := sector
switch d.Layout {
case SectorOrderDOS33Alt:
isector = SectorMapperDOS33Alt(sector)
case SectorOrderDOS33:
isector = SectorMapperDOS33(sector)
case SectorOrderProDOS:
isector = SectorMapperProDOS(sector)
}
d.SectorPointer = (track * d.Format.SPT() * STD_BYTES_PER_SECTOR) + (STD_BYTES_PER_SECTOR * isector)
}
func (d *DSKWrapper) UpdateTrack(track int) {
d.NibblesChanged = true
}
func (d *DSKWrapper) ChecksumDisk() string {
return Checksum(d.Data)
}
func (d *DSKWrapper) ChecksumSector(t, s int) string {
d.SetTrack(t)
d.SetSector(s)
return Checksum(d.Data[d.SectorPointer : d.SectorPointer+256])
}
func (d *DSKWrapper) IsChanged() bool {
return d.NibblesChanged
}
// func (d *DSKWrapper) GetNibbles() []byte {
// return d.Nibbles
// }
// Read is a simple function to return the current pointed to sector
func (d *DSKWrapper) Read() []byte {
////fmt.Printf("---> Reading track %d, sector %d\n", d.CurrentTrack, d.CurrentSector)
return d.Data[d.SectorPointer : d.SectorPointer+256]
}
func (d *DSKWrapper) Write(data []byte) {
////fmt.Printf("---> Reading track %d, sector %d\n", d.CurrentTrack, d.CurrentSector)
l := len(data)
if l > STD_BYTES_PER_SECTOR {
l = STD_BYTES_PER_SECTOR
}
for i, v := range data {
if i >= l {
break
}
d.Data[d.SectorPointer+i] = v
}
}
// Seek is a convienience function to go straight to a particular track & sector
func (d *DSKWrapper) Seek(t, s int) error {
var e error
e = d.SetTrack(t)
if e != nil {
return e
}
e = d.SetSector(s)
return e
}
func (d *DSKWrapper) SetData(data []byte) {
// for i, v := range data {
// d.Data[i] = v
// }
d.Data = data
}
func NewDSKWrapper(nibbler Nibbler, filename string) (*DSKWrapper, error) {
f, e := os.Open(filename)
if e != nil {
return nil, e
}
data, e := ioutil.ReadAll(f)
f.Close()
if e != nil {
return nil, e
}
w, e := NewDSKWrapperBin(nibbler, data, filename)
return w, e
}
func NewDSKWrapperBin(nibbler Nibbler, data []byte, filename string) (*DSKWrapper, error) {
if len(data) != 232960 &&
len(data) != STD_DISK_BYTES &&
len(data) != STD_DISK_BYTES_OLD &&
len(data) != PRODOS_400KB_DISK_BYTES &&
len(data) != PRODOS_400KB_DISK_BYTES+64 &&
len(data) != PRODOS_800KB_DISK_BYTES &&
len(data) != PRODOS_800KB_DISK_BYTES+64 &&
len(data) != STD_DISK_BYTES+64 {
return nil, errors.New("Incorrect disk bytes")
}
this := &DSKWrapper{}
this.SetData(data)
this.Filename = filename
this.Layout = SectorOrderDOS33
this.CurrentSectorOrder = DOS_33_SECTOR_ORDER
this.Nibbles = nibbler
this.WriteProtected = false
this.Identify()
return this, nil
}
func (dsk *DSKWrapper) GetNibbles() []byte {
n := make([]byte, DISK_NIBBLE_LENGTH)
for i, _ := range n {
n[i] = dsk.Nibbles.GetNibble(i)
}
return n
}
func (dsk *DSKWrapper) SetNibbles(data []byte) {
if dsk.Nibbles == nil {
return
}
for i, v := range data {
dsk.Nibbles.SetNibble(i, v)
}
}
func (dsk *DSKWrapper) Identify() {
dsk.Format = GetDiskFormat(DF_NONE)
var hint DiskFormat
dsk.Filename = strings.ToLower(dsk.Filename)
switch {
case strings.HasSuffix(dsk.Filename, ".po"):
hint = GetDiskFormat(DF_PRODOS)
case strings.HasSuffix(dsk.Filename, ".do"):
hint = GetDiskFormat(DF_DOS_SECTORS_16)
default:
hint = GetDiskFormat(DF_DOS_SECTORS_16)
}
is2MG, Format, Layout, zdsk := dsk.Is2MG()
if is2MG {
////fmt.Println("repacked", len(zdsk.Data))
dsk.SetData(zdsk.Data)
dsk.Layout = Layout
dsk.Format = Format
return
}
isPD, Format, Layout := dsk.IsProDOS()
if isPD {
if Format == GetDiskFormat(DF_PRODOS) {
dsk.Format = GetDiskFormat(DF_PRODOS)
dsk.Layout = Layout
switch dsk.Layout {
case SectorOrderProDOS:
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
case SectorOrderProDOSLinear:
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
case SectorOrderDOS33:
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
}
dsk.SetNibbles(dsk.Nibblize())
return
} else {
dsk.Format = GetDiskFormat(DF_PRODOS_800KB)
dsk.Layout = Layout
switch dsk.Layout {
case SectorOrderProDOS:
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
case SectorOrderProDOSLinear:
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
case SectorOrderDOS33:
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
}
dsk.SetNibbles(make([]byte, 232960))
return
}
}
isRDOS, Version := dsk.IsRDOS()
if isRDOS {
dsk.RDOSFormat = Version
switch Version {
case RDOS_3:
dsk.Format = GetDiskFormat(DF_RDOS_3)
dsk.Layout = SectorOrderDOS33Alt
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
dsk.SetNibbles(dsk.Nibblize())
case RDOS_32:
dsk.Format = GetDiskFormat(DF_RDOS_32)
dsk.Layout = SectorOrderDOS33Alt
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
dsk.SetNibbles(make([]byte, 232960)) // FIXME: fix nibbles
case RDOS_33:
dsk.Format = GetDiskFormat(DF_RDOS_33)
dsk.Layout = SectorOrderProDOS
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
dsk.SetNibbles(dsk.Nibblize())
}
return
}
isAppleDOS, Format, Layout := dsk.IsAppleDOS()
if isAppleDOS {
////fmt.Printf("Format: %s\n", Format.String())
dsk.Format = Format
dsk.Layout = Layout
switch Layout {
case SectorOrderProDOS:
////fmt.Println("Sector Order: ProDOS")
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
case SectorOrderProDOSLinear:
////fmt.Println("Sector Order: Linear")
dsk.CurrentSectorOrder = LINEAR_SECTOR_ORDER
case SectorOrderDOS33:
////fmt.Println("Sector Order: DOS33")
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
case SectorOrderDOS32:
////fmt.Println("Sector Order: DOS32")
//dsk.CurrentSectorOrder = DOS_32_SECTOR_ORDER
case SectorOrderDOS33Alt:
////fmt.Println("Sector Order: Alt Linear")
dsk.CurrentSectorOrder = LINEAR_SECTOR_ORDER
}
dsk.SetNibbles(dsk.Nibblize())
return
}
fp := hex.EncodeToString(dsk.Data[:32])
if dfmt, ok := identity[fp]; ok {
dsk.Format = dfmt
//fmt.Println(dsk.Format.String())
}
//fmt.Printf("Disk name: %s\n", dsk.Filename)
// 1. NIB
if len(dsk.Data) == 232960 {
//fmt.Println("THIS IS A NIB")
dsk.Format = GetDiskFormat(DF_DOS_SECTORS_16)
dsk.SetNibbles(dsk.Data)
return
}
// 2. Wrong size
if len(dsk.Data) != STD_DISK_BYTES && len(dsk.Data) != STD_DISK_BYTES_OLD && len(dsk.Data) != PRODOS_800KB_DISK_BYTES {
//fmt.Println("NOT STANDARD DISK")
dsk.Format = GetDiskFormat(DF_NONE)
dsk.SetNibbles(make([]byte, 232960))
return
}
// 3. DOS 3x Disk
vtoc, e := dsk.AppleDOSGetVTOC()
//fmt.Println(vtoc.GetTracks(), vtoc.GetSectors())
if e == nil && vtoc.GetTracks() == 35 {
//bps := vtoc.BytesPerSector()
t := vtoc.GetTracks()
s := vtoc.GetSectors()
//fmt.Printf("DOS Tracks = %d, Sectors = %d\n", t, s)
if t == 35 && s == 16 {
dsk.Layout = SectorOrderDOS33
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
dsk.Format = GetDiskFormat(DF_DOS_SECTORS_16)
dsk.SetNibbles(dsk.Nibblize())
} else if t == 35 && s == 13 {
dsk.Layout = SectorOrderDOS32
dsk.CurrentSectorOrder = DOS_32_SECTOR_ORDER
dsk.Format = GetDiskFormat(DF_DOS_SECTORS_13)
dsk.SetNibbles(make([]byte, 232960))
}
return
}
//fmt.Println("Trying prodos / pascal")
isPAS, volName := dsk.IsPascal()
if isPAS && volName != "" {
dsk.Format = GetDiskFormat(DF_PASCAL)
dsk.Layout = SectorOrderDOS33
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
dsk.SetNibbles(dsk.Nibblize())
return
}
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
if dsk.Format == GetDiskFormat(DF_PRODOS) && len(dsk.Data) == PRODOS_800KB_DISK_BYTES {
dsk.Format = GetDiskFormat(DF_PRODOS_800KB)
}
//fmt.Println(dsk.Format.String())
switch dsk.Format.ID {
case DF_PRODOS:
vdh, e := dsk.PRODOSGetVDH(2)
////fmt.Printf("Blocks = %d\n", vdh.GetTotalBlocks())
if e == nil && vdh.GetStorageType() == 0xf && vdh.GetTotalBlocks() == 280 {
dsk.Format = GetDiskFormat(DF_PRODOS)
dsk.Layout = SectorOrderDOS33
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
dsk.SetNibbles(dsk.Nibblize())
//fmt.Println("THIS IS A PRODOS DISKETTE, DOS Ordered")
return
} else {
dsk.Format = GetDiskFormat(DF_PRODOS)
dsk.Layout = SectorOrderDOS33Alt
////fmt.Println("Try again")
vdh, e = dsk.PRODOSGetVDH(2)
if e == nil && vdh.GetStorageType() == 0xf && vdh.GetTotalBlocks() == 280 {
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
dsk.SetNibbles(dsk.Nibblize())
//fmt.Println("THIS IS A PRODOS DISKETTE, ProDOS Ordered")
return
}
}
case DF_PRODOS_800KB:
vdh, e := dsk.PRODOS800GetVDH(2)
//fmt.Printf("Blocks = %d\n", vdh.GetTotalBlocks())
if e == nil && vdh.GetStorageType() == 0xf && vdh.GetTotalBlocks() == 1600 {
dsk.Format = GetDiskFormat(DF_PRODOS_800KB)
dsk.Layout = SectorOrderDOS33
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
//dsk.SetNibbles(dsk.nibblize())
dsk.SetNibbles(make([]byte, 232960))
//fmt.Println("THIS IS A PRODOS DISKETTE, DOS Ordered")
return
}
}
switch hint.ID {
case DF_PRODOS:
dsk.Format = GetDiskFormat(DF_PRODOS)
dsk.Layout = SectorOrderProDOS
dsk.CurrentSectorOrder = PRODOS_SECTOR_ORDER
dsk.SetNibbles(dsk.Nibblize())
//fmt.Println("VTOC read failed, will nibblize anyway...")
case DF_DOS_SECTORS_16:
//fmt.Println("VTOC read failed, will nibblize anyway...")
dsk.Layout = SectorOrderProDOS
dsk.CurrentSectorOrder = DOS_33_SECTOR_ORDER
dsk.Format = GetDiskFormat(DF_DOS_SECTORS_16)
dsk.SetNibbles(dsk.Nibblize())
}
}
//func (d *DSKWrapper) ReadFileSectorsProDOS(fd ProDOSFileDescriptor) ([]byte, error) {
//}
func Dump(bytes []byte) {
perline := 0xC
base := 0
ascii := ""
for i, v := range bytes {
if i%perline == 0 {
fmt.Println(" " + ascii)
ascii = ""
fmt.Printf("%.4X:", base+i)
}
if v >= 32 && v < 128 {
ascii += string(rune(v))
} else {
ascii += "."
}
fmt.Printf(" %.2X", v)
}
fmt.Println(" " + ascii)
}
func Between(v, lo, hi uint) bool {
return ((v >= lo) && (v <= hi))
}
func PokeToAscii(v uint, usealt bool) int {
highbit := v & 1024
v = v & 1023
if Between(v, 0, 31) {
return int((64 + (v % 32)) | highbit)
}
if Between(v, 32, 63) {
return int((32 + (v % 32)) | highbit)
}
if Between(v, 64, 95) {
if usealt {
return int((128 + (v % 32)) | highbit)
} else {
return int((64 + (v % 32)) | highbit)
}
}
if Between(v, 96, 127) {
if usealt {
return int((96 + (v % 32)) | highbit)
} else {
return int((32 + (v % 32)) | highbit)
}
}
if Between(v, 128, 159) {
return int((64 + (v % 32)) | highbit)
}
if Between(v, 160, 191) {
return int((32 + (v % 32)) | highbit)
}
if Between(v, 192, 223) {
return int((64 + (v % 32)) | highbit)
}
if Between(v, 224, 255) {
return int((96 + (v % 32)) | highbit)
}
return int(v | highbit)
}
func (d *DSKWrapper) Nibblize() []byte {
if len(d.Data) != STD_DISK_BYTES {
return make([]byte, 232960)
}
data := d.Data
output := bytes.NewBuffer([]byte(nil))
for track := 0; track < STD_TRACKS_PER_DISK; track++ {
//d.writeJunkBytes(output, 48);
for sector := 0; sector < STD_SECTORS_PER_TRACK; sector++ {
//gap2 := int((rand.Float32() * 5.0) + 4)
gap2 := 6
// 15 junk bytes
d.writeJunkBytes(output, 15)
// Address block
d.writeAddressBlock(output, track, sector, 254)
// 4 junk bytes
d.writeJunkBytes(output, gap2)
// Data block
d.nibblizeBlock(output, track, d.CurrentSectorOrder[sector], data)
// 34 junk bytes
d.writeJunkBytes(output, 38-gap2)
}
}
return output.Bytes()
}
func (d *DSKWrapper) NibbleOffsetToTS(offset int) (int, int) {
offset = offset - (offset % 256)
c := offset / 256
sector := c % SECTOR_COUNT
track := (c - sector) / SECTOR_COUNT
return track, sector
}
func (d *DSKWrapper) nibblizeBlock(output io.Writer, track, sector int, nibbles []byte) {
//log.Printf("NibblizeBlock(%d, %d)", track, sector)
offset := ((track * SECTOR_COUNT) + sector) * 256
temp := make([]int, 342)
for i := 0; i < 256; i++ {
temp[i] = int((nibbles[offset+i] & 0x0ff) >> 2)
}
hi := 0x001
med := 0x0AB
low := 0x055
for i := 0; i < 0x56; i++ {
value := ((nibbles[offset+hi] & 1) << 5) |
((nibbles[offset+hi] & 2) << 3) |
((nibbles[offset+med] & 1) << 3) |
((nibbles[offset+med] & 2) << 1) |
((nibbles[offset+low] & 1) << 1) |
((nibbles[offset+low] & 2) >> 1)
temp[i+256] = int(value)
hi = (hi - 1) & 0x0ff
med = (med - 1) & 0x0ff
low = (low - 1) & 0x0ff
}
output.Write([]byte{0x0d5, 0x0aa, 0x0ad})
last := 0
for i := len(temp) - 1; i > 255; i-- {
value := temp[i] ^ last
output.Write([]byte{NIBBLE_62[value]})
last = temp[i]
}
for i := 0; i < 256; i++ {
value := temp[i] ^ last
output.Write([]byte{NIBBLE_62[value]})
last = temp[i]
}
// Last data byte used as checksum
output.Write([]byte{NIBBLE_62[last]})
output.Write([]byte{0x0de, 0x0aa, 0x0eb})
}
func (d *DSKWrapper) writeJunkBytes(output io.Writer, i int) {
for c := 0; c < i; c++ {
output.Write([]byte{0xff})
}
}
func (d *DSKWrapper) writeAddressBlock(output io.Writer, track, sector int, volumeNumber int) {
output.Write([]byte{0x0d5, 0x0aa, 0x096})
var checksum int = 0x00
// volume
checksum ^= volumeNumber
output.Write(d.getOddEven(volumeNumber))
// track
checksum ^= track
output.Write(d.getOddEven(track))
// sector
checksum ^= sector
output.Write(d.getOddEven(sector))
// checksum
output.Write(d.getOddEven(checksum & 0x0ff))
output.Write([]byte{0xde, 0xaa, 0xeb})
}
func (d *DSKWrapper) getOddEven(i int) []byte {
out := []byte{0, 0}
out[0] = byte(0xAA | (i >> 1))
out[1] = byte(0xAA | i)
return out
}
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