107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
package disk
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import "fmt"
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/*
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2MG format loader...
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*/
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const PREAMBLE_2MG_SIZE = 0x40
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var MAGIC_2MG = []byte{byte('2'), byte('I'), byte('M'), byte('G')}
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type Header2MG struct {
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Data [64]byte
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}
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func (h *Header2MG) SetData(data []byte) {
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for i, v := range data {
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if i < 64 {
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h.Data[i] = v
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}
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}
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}
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func (h *Header2MG) GetID() string {
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return string(h.Data[0x00:0x04])
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}
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func (h *Header2MG) GetCreatorID() string {
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return string(h.Data[0x04:0x08])
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}
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func (h *Header2MG) GetHeaderSize() int {
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return int(h.Data[0x08]) + 256*int(h.Data[0x09])
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}
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func (h *Header2MG) GetVersion() int {
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return int(h.Data[0x0A]) + 256*int(h.Data[0x0B])
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}
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func (h *Header2MG) GetImageFormat() int {
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return int(h.Data[0x0C]) + 256*int(h.Data[0x0D]) + 65336*int(h.Data[0x0E]) + 16777216*int(h.Data[0x0F])
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}
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func (h *Header2MG) GetDOSFlags() int {
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return int(h.Data[0x10]) + 256*int(h.Data[0x11]) + 65336*int(h.Data[0x12]) + 16777216*int(h.Data[0x13])
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}
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func (h *Header2MG) GetProDOSBlocks() int {
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return int(h.Data[0x14]) + 256*int(h.Data[0x15]) + 65336*int(h.Data[0x16]) + 16777216*int(h.Data[0x17])
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}
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func (h *Header2MG) GetDiskDataStart() int {
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return int(h.Data[0x18]) + 256*int(h.Data[0x19]) + 65336*int(h.Data[0x1A]) + 16777216*int(h.Data[0x1B])
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}
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func (h *Header2MG) GetDiskDataLength() int {
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return int(h.Data[0x1C]) + 256*int(h.Data[0x1D]) + 65336*int(h.Data[0x1E]) + 16777216*int(h.Data[0x1F])
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}
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func (dsk *DSKWrapper) Is2MG() (bool, DiskFormat, SectorOrder, *DSKWrapper) {
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h := &Header2MG{}
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h.SetData(dsk.Data[:0x40])
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if h.GetID() != "2IMG" {
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return false, GetDiskFormat(DF_NONE), SectorOrderDOS33, nil
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}
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fmt.Println("Disk has 2MG Magic")
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fmt.Printf("Block count %d\n", h.GetProDOSBlocks())
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start := h.GetDiskDataStart()
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size := h.GetDiskDataLength()
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if size < len(dsk.Data)-start {
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size = len(dsk.Data) - start
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}
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if size != STD_DISK_BYTES && size != PRODOS_800KB_DISK_BYTES && size != PRODOS_400KB_DISK_BYTES {
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fmt.Printf("Bad size %d bytes @ start %d\n", size, start)
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return false, GetDiskFormat(DF_NONE), SectorOrderDOS33, nil
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}
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data := dsk.Data[start : start+size]
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format := h.GetImageFormat()
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switch format {
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case 0x00: /* DOS sector order */
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zdsk, _ := NewDSKWrapperBin(dsk.Nibbles, data, dsk.Filename)
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return true, GetDiskFormat(DF_DOS_SECTORS_16), SectorOrderDOS33, zdsk
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case 0x01: /* ProDOS sector order */
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zdsk, _ := NewDSKWrapperBin(dsk.Nibbles, data, dsk.Filename)
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if h.GetProDOSBlocks() == 1600 {
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return true, GetDiskFormat(DF_PRODOS_800KB), SectorOrderProDOSLinear, zdsk
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} else if h.GetProDOSBlocks() == 800 {
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return true, GetDiskFormat(DF_PRODOS_400KB), SectorOrderProDOSLinear, zdsk
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} else {
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return true, GetPDDiskFormat(DF_PRODOS_CUSTOM, h.GetProDOSBlocks()), SectorOrderProDOSLinear, zdsk
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}
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}
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return false, GetDiskFormat(DF_NONE), SectorOrderDOS33, nil
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}
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