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prodos: basic catalog now works

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This commit is contained in:
Zellyn Hunter 2017-04-12 23:22:45 -04:00
parent c244ec5257
commit 05fdbcd0ba
2 changed files with 175 additions and 25 deletions
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2
README.md
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@ -46,7 +46,7 @@ Current disk operations supported:
| Feature | DOS 3.3 | ProDOS | NakedOS/Super-Mon |
| ---------------- | -------- | ------ | ------------------ |
| basic structures | ✓ | ✓ | ✓ |
| ls | ✓ | ✗ | ✓ |
| ls | ✓ | ✓ | ✓ |
| dump | ✓ | ✗ | ✓ |
| put | ✗ | ✗ | ✓ |
| dumptext | ✗ | ✗ | ✗ |

198
lib/prodos/prodos.go
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@ -1,6 +1,6 @@
// Copyright © 2017 Zellyn Hunter <zellyn@gmail.com>
// Package prodos contains routines for working with the on-disk
// Package prodos contains routines for working with the on-device
// structures of Apple ProDOS.
package prodos
@ -12,6 +12,17 @@ import (
"github.com/zellyn/diskii/lib/disk"
)
// Storage types.
const (
TypeDeleted = 0
TypeSeedling = 0x1
TypeSapling = 0x2
TypeTree = 0x3
TypeSubdirectory = 0xD
TypeSubdirectoryHeader = 0xE
TypeVolumeDirectoryHeader = 0xF
)
// blockBase represents a 512-byte block of data.
type blockBase struct {
block uint16 // Block index this data was loaded from.
@ -91,9 +102,9 @@ func (vbm VolumeBitMap) IsFree(block uint16) bool {
return vbm[blockIndex].data[blockByteIndex]&bit > 0
}
// ReadVolumeBitMap reads the entire volume bitmap from a block
// readVolumeBitMap reads the entire volume bitmap from a block
// device.
func ReadVolumeBitMap(bd disk.BlockDevice, startBlock uint16) (VolumeBitMap, error) {
func readVolumeBitMap(bd disk.BlockDevice, startBlock uint16) (VolumeBitMap, error) {
blocks := bd.Blocks() / 4096
vbm := NewVolumeBitMap(startBlock, blocks)
for i := 0; i < len(vbm); i++ {
@ -357,6 +368,11 @@ func (fd FileDescriptor) Name() string {
return string(fd.FileName[0 : fd.TypeAndNameLength&0xf])
}
// Type returns the type of a file descriptor.
func (fd FileDescriptor) Type() byte {
return fd.TypeAndNameLength >> 4
}
// toBytes converts a FileDescriptor to a slice of bytes.
func (fd FileDescriptor) toBytes() []byte {
buf := make([]byte, 0x27)
@ -595,10 +611,11 @@ func (sh SubdirectoryHeader) Name() string {
// Volume is the in-memory representation of a device's volume
// information.
type Volume struct {
keyBlock *VolumeDirectoryKeyBlock
blocks []*VolumeDirectoryBlock
bitmap *VolumeBitMap
subdirs map[uint16]*Subdirectory
keyBlock *VolumeDirectoryKeyBlock
blocks []*VolumeDirectoryBlock
bitmap *VolumeBitMap
subdirsByBlock map[uint16]*Subdirectory
subdirsByName map[string]*Subdirectory
}
// Subdirectory is the in-memory representation of a single
@ -608,19 +625,45 @@ type Subdirectory struct {
blocks []*SubdirectoryBlock
}
// readVolume reads the entire volume and subdirectories frmo a disk
// descriptors returns a slice of all top-level file descriptors in a
// volume, deleted or not.
func (v Volume) descriptors() []FileDescriptor {
var descs []FileDescriptor
descs = append(descs, v.keyBlock.Descriptors[:]...)
for _, block := range v.blocks {
descs = append(descs, block.Descriptors[:]...)
}
return descs
}
// subdirDescriptors returns a slice of all top-level file descriptors
// in a volume that are subdirectories.
func (v Volume) subdirDescriptors() []FileDescriptor {
var descs []FileDescriptor
for _, desc := range v.descriptors() {
if desc.Type() == TypeSubdirectory {
descs = append(descs, desc)
}
}
return descs
}
// readVolume reads the entire volume and subdirectories from a device
// into memory.
func readVolume(bd disk.BlockDevice) (Volume, error) {
func readVolume(bd disk.BlockDevice, keyBlock uint16) (Volume, error) {
v := Volume{
keyBlock: &VolumeDirectoryKeyBlock{},
subdirs: make(map[uint16]*Subdirectory),
keyBlock: &VolumeDirectoryKeyBlock{},
subdirsByBlock: make(map[uint16]*Subdirectory),
subdirsByName: make(map[string]*Subdirectory),
}
if err := disk.UnmarshalBlock(bd, v.keyBlock, 2); err != nil {
return v, fmt.Errorf("cannot read first block of volume directory (block 2): %v", err)
if err := disk.UnmarshalBlock(bd, v.keyBlock, keyBlock); err != nil {
return v, fmt.Errorf("cannot read first block of volume directory (block %d): %v", keyBlock, err)
}
if vbm, err := ReadVolumeBitMap(bd, v.keyBlock.Header.BitMapPointer); err != nil {
if vbm, err := readVolumeBitMap(bd, v.keyBlock.Header.BitMapPointer); err != nil {
return v, err
} else {
v.bitmap = &vbm
@ -634,9 +677,100 @@ func readVolume(bd disk.BlockDevice) (Volume, error) {
v.blocks = append(v.blocks, &vdb)
}
sdds := v.subdirDescriptors()
for i := 0; i < len(sdds); i++ {
sdd := sdds[i]
sub, err := readSubdirectory(bd, sdd)
if err != nil {
return v, err
}
v.subdirsByBlock[sdd.KeyPointer] = &sub
sdds = append(sdds, sub.subdirDescriptors()...)
}
for _, sd := range v.subdirsByBlock {
name := sd.keyBlock.Header.Name()
parentName, err := parentDirName(sd.keyBlock.Header.ParentPointer, keyBlock, v.subdirsByBlock)
if err != nil {
return v, err
}
if parentName != "" {
name = parentName + "/" + name
}
v.subdirsByName[name] = sd
}
return v, nil
}
// descriptors returns a slice of all top-level file descriptors in a
// subdirectory, deleted or not.
func (s Subdirectory) descriptors() []FileDescriptor {
var descs []FileDescriptor
descs = append(descs, s.keyBlock.Descriptors[:]...)
for _, block := range s.blocks {
descs = append(descs, block.Descriptors[:]...)
}
return descs
}
// subdirDescriptors returns a slice of all top-level file descriptors
// in a subdirectory that are subdirectories.
func (s Subdirectory) subdirDescriptors() []FileDescriptor {
var descs []FileDescriptor
for _, desc := range s.descriptors() {
if desc.Type() == TypeSubdirectory {
descs = append(descs, desc)
}
}
return descs
}
// fullDirName returns the full recursive directory name of the given parent directory.
func parentDirName(parentDirectoryBlock uint16, keyBlock uint16, subdirMap map[uint16]*Subdirectory) (string, error) {
if parentDirectoryBlock == keyBlock {
return "", nil
}
sd := subdirMap[parentDirectoryBlock]
if sd == nil {
return "", fmt.Errorf("Unable to find subdirectory for block %d", parentDirectoryBlock)
}
parentName, err := parentDirName(sd.keyBlock.Header.ParentPointer, keyBlock, subdirMap)
if err != nil {
return "", err
}
if parentName == "" {
return sd.keyBlock.Header.Name(), nil
}
return parentName + "/" + sd.keyBlock.Header.Name(), nil
}
// readSubdirectory reads a single subdirectory from a device into
// memory.
func readSubdirectory(bd disk.BlockDevice, fd FileDescriptor) (Subdirectory, error) {
s := Subdirectory{
keyBlock: &SubdirectoryKeyBlock{},
}
if err := disk.UnmarshalBlock(bd, s.keyBlock, fd.KeyPointer); err != nil {
return s, fmt.Errorf("cannot read first block of subdirectory %q (block %d): %v", fd.Name(), fd.KeyPointer, err)
}
for block := s.keyBlock.Next; block != 0; block = s.blocks[len(s.blocks)-1].Next {
sdb := SubdirectoryBlock{}
if err := disk.UnmarshalBlock(bd, &sdb, block); err != nil {
return s, err
}
s.blocks = append(s.blocks, &sdb)
}
return s, nil
}
// copyBytes is just like the builtin copy, but just for byte slices,
// and it checks that dst and src have the same length.
func copyBytes(dst, src []byte) int {
@ -672,18 +806,34 @@ func (o operator) HasSubdirs() bool {
// Catalog returns a catalog of disk entries. subdir should be empty
// for operating systems that do not support subdirectories.
func (o operator) Catalog(subdir string) ([]disk.Descriptor, error) {
return nil, fmt.Errorf("%s doesn't implement Catalog yet", operatorName)
/*
fds, _, err := ReadCatalog(o.dev)
if err != nil {
return nil, err
vol, err := readVolume(o.dev, 2)
if err != nil {
return nil, err
}
var result []disk.Descriptor
if subdir == "" {
for _, desc := range vol.descriptors() {
if desc.Type() != TypeDeleted {
result = append(result, desc.descriptor())
}
}
descs := make([]disk.Descriptor, 0, len(fds))
for _, fd := range fds {
descs = append(descs, fd.descriptor())
return result, nil
}
sd, ok := vol.subdirsByName[subdir]
if !ok {
return nil, fmt.Errorf("subdirectory %q not found", subdir)
}
for _, desc := range sd.descriptors() {
if desc.Type() != TypeDeleted {
result = append(result, desc.descriptor())
}
return descs, nil
*/
}
return result, nil
}
// GetFile retrieves a file by name.