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prodos: make structures BlockSources + BlockSinks
This commit is contained in:
Zellyn Hunter
parent
1d7be34b5c
commit
1758fc0f32
@ -33,6 +33,10 @@ type bitmapPart struct {
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data disk.Block
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}
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// Ensure that bitmapPart is valid BlockSource and BlockSink.
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var _ disk.BlockSource = (*bitmapPart)(nil)
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var _ disk.BlockSink = (*bitmapPart)(nil)
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// FromBlock unmarshals a bitmapPart from a Block.
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func (bp *bitmapPart) FromBlock(block disk.Block) error {
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bp.data = block
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@ -87,7 +91,8 @@ func (vbm VolumeBitMap) IsFree(block uint16) bool {
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return vbm[blockIndex].data[blockByteIndex]&bit > 0
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}
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// ReadVolumeBitMap
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// ReadVolumeBitMap reads the entire volume bitmap from a block
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// device.
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func ReadVolumeBitMap(bd disk.BlockDevice, startBlock uint16) (VolumeBitMap, error) {
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blocks := bd.Blocks() / 4096
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vbm := NewVolumeBitMap(startBlock, blocks)
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@ -145,6 +150,7 @@ func (dt DateTime) Validate(fieldDescription string) (errors []error) {
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// VolumeDirectoryKeyBlock is the struct used to hold the ProDOS Volume Directory Key
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// Block structure. See page 4-4 of Beneath Apple ProDOS.
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type VolumeDirectoryKeyBlock struct {
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blockBase
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Prev uint16 // Pointer to previous block (always zero: the KeyBlock is the first Volume Directory block
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Next uint16 // Pointer to next block in the Volume Directory
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Header VolumeDirectoryHeader
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@ -152,8 +158,12 @@ type VolumeDirectoryKeyBlock struct {
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Extra byte // Trailing byte (so we don't lose it)
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}
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// Ensure that VolumeDirectoryKeyBlock is valid BlockSource and BlockSink.
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var _ disk.BlockSource = (*VolumeDirectoryKeyBlock)(nil)
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var _ disk.BlockSink = (*VolumeDirectoryKeyBlock)(nil)
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// ToBlock marshals the VolumeDirectoryKeyBlock to a Block of bytes.
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func (vdkb VolumeDirectoryKeyBlock) ToBlock() disk.Block {
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func (vdkb VolumeDirectoryKeyBlock) ToBlock() (disk.Block, error) {
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var block disk.Block
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binary.LittleEndian.PutUint16(block[0x0:0x2], vdkb.Prev)
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binary.LittleEndian.PutUint16(block[0x2:0x4], vdkb.Next)
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@ -162,11 +172,11 @@ func (vdkb VolumeDirectoryKeyBlock) ToBlock() disk.Block {
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copyBytes(block[0x2b+i*0x27:0x2b+(i+1)*0x27], desc.toBytes())
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}
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block[511] = vdkb.Extra
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return block
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return block, nil
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}
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// FromBlock unmarshals a Block of bytes into a VolumeDirectoryKeyBlock.
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func (vdkb *VolumeDirectoryKeyBlock) FromBlock(block disk.Block) {
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func (vdkb *VolumeDirectoryKeyBlock) FromBlock(block disk.Block) error {
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vdkb.Prev = binary.LittleEndian.Uint16(block[0x0:0x2])
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vdkb.Next = binary.LittleEndian.Uint16(block[0x2:0x4])
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vdkb.Header.fromBytes(block[0x04:0x2b])
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@ -174,6 +184,7 @@ func (vdkb *VolumeDirectoryKeyBlock) FromBlock(block disk.Block) {
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vdkb.Descriptors[i].fromBytes(block[0x2b+i*0x27 : 0x2b+(i+1)*0x27])
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}
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vdkb.Extra = block[511]
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return nil
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}
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// Validate validates a VolumeDirectoryKeyBlock for valid values.
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@ -193,14 +204,19 @@ func (vdkb VolumeDirectoryKeyBlock) Validate() (errors []error) {
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// VolumeDirectoryBlock is a normal (non-key) segment in the Volume Directory Header.
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type VolumeDirectoryBlock struct {
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blockBase
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Prev uint16 // Pointer to previous block in the Volume Directory.
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Next uint16 // Pointer to next block in the Volume Directory.
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Descriptors [13]FileDescriptor
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Extra byte // Trailing byte (so we don't lose it)
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}
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// Ensure that VolumeDirectoryBlock is valid BlockSource and BlockSink.
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var _ disk.BlockSource = (*VolumeDirectoryBlock)(nil)
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var _ disk.BlockSink = (*VolumeDirectoryBlock)(nil)
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// ToBlock marshals a VolumeDirectoryBlock to a Block of bytes.
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func (vdb VolumeDirectoryBlock) ToBlock() disk.Block {
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func (vdb VolumeDirectoryBlock) ToBlock() (disk.Block, error) {
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var block disk.Block
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binary.LittleEndian.PutUint16(block[0x0:0x2], vdb.Prev)
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binary.LittleEndian.PutUint16(block[0x2:0x4], vdb.Next)
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@ -208,17 +224,18 @@ func (vdb VolumeDirectoryBlock) ToBlock() disk.Block {
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copyBytes(block[0x04+i*0x27:0x04+(i+1)*0x27], desc.toBytes())
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}
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block[511] = vdb.Extra
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return block
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return block, nil
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}
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// FromBlock unmarshals a Block of bytes into a VolumeDirectoryBlock.
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func (vdb *VolumeDirectoryBlock) FromBlock(block disk.Block) {
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func (vdb *VolumeDirectoryBlock) FromBlock(block disk.Block) error {
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vdb.Prev = binary.LittleEndian.Uint16(block[0x0:0x2])
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vdb.Next = binary.LittleEndian.Uint16(block[0x2:0x4])
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for i := range vdb.Descriptors {
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vdb.Descriptors[i].fromBytes(block[0x4+i*0x27 : 0x4+(i+1)*0x27])
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}
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vdb.Extra = block[511]
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return nil
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}
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// Validate validates a VolumeDirectoryBlock for valid values.
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@ -392,6 +409,7 @@ func (i IndexBlock) Set(blockNum byte, block uint16) {
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// SubdirectoryKeyBlock is the struct used to hold the first entry in
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// a subdirectory structure.
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type SubdirectoryKeyBlock struct {
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blockBase
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Prev uint16 // Pointer to previous block (always zero: the KeyBlock is the first Volume Directory block
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Next uint16 // Pointer to next block in the Volume Directory
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Header SubdirectoryHeader
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@ -399,8 +417,12 @@ type SubdirectoryKeyBlock struct {
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Extra byte // Trailing byte (so we don't lose it)
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}
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// Ensure that SubdirectoryKeyBlock is valid BlockSource and BlockSink.
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var _ disk.BlockSource = (*SubdirectoryKeyBlock)(nil)
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var _ disk.BlockSink = (*SubdirectoryKeyBlock)(nil)
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// ToBlock marshals the SubdirectoryKeyBlock to a Block of bytes.
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func (skb SubdirectoryKeyBlock) ToBlock() disk.Block {
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func (skb SubdirectoryKeyBlock) ToBlock() (disk.Block, error) {
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var block disk.Block
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binary.LittleEndian.PutUint16(block[0x0:0x2], skb.Prev)
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binary.LittleEndian.PutUint16(block[0x2:0x4], skb.Next)
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@ -409,11 +431,11 @@ func (skb SubdirectoryKeyBlock) ToBlock() disk.Block {
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copyBytes(block[0x2b+i*0x27:0x2b+(i+1)*0x27], desc.toBytes())
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}
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block[511] = skb.Extra
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return block
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return block, nil
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}
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// FromBlock unmarshals a Block of bytes into a SubdirectoryKeyBlock.
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func (skb *SubdirectoryKeyBlock) FromBlock(block disk.Block) {
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func (skb *SubdirectoryKeyBlock) FromBlock(block disk.Block) error {
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skb.Prev = binary.LittleEndian.Uint16(block[0x0:0x2])
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skb.Next = binary.LittleEndian.Uint16(block[0x2:0x4])
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skb.Header.fromBytes(block[0x04:0x2b])
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@ -421,6 +443,7 @@ func (skb *SubdirectoryKeyBlock) FromBlock(block disk.Block) {
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skb.Descriptors[i].fromBytes(block[0x2b+i*0x27 : 0x2b+(i+1)*0x27])
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}
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skb.Extra = block[511]
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return nil
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}
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// Validate validates a SubdirectoryKeyBlock for valid values.
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@ -440,14 +463,19 @@ func (skb SubdirectoryKeyBlock) Validate() (errors []error) {
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// SubdirectoryBlock is a normal (non-key) segment in a Subdirectory.
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type SubdirectoryBlock struct {
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blockBase
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Prev uint16 // Pointer to previous block in the Volume Directory.
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Next uint16 // Pointer to next block in the Volume Directory.
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Descriptors [13]FileDescriptor
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Extra byte // Trailing byte (so we don't lose it)
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}
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// Ensure that SubdirectoryBlock is valid BlockSource and BlockSink.
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var _ disk.BlockSource = (*SubdirectoryBlock)(nil)
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var _ disk.BlockSink = (*SubdirectoryBlock)(nil)
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// ToBlock marshals a SubdirectoryBlock to a Block of bytes.
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func (sb SubdirectoryBlock) ToBlock() disk.Block {
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func (sb SubdirectoryBlock) ToBlock() (disk.Block, error) {
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var block disk.Block
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binary.LittleEndian.PutUint16(block[0x0:0x2], sb.Prev)
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binary.LittleEndian.PutUint16(block[0x2:0x4], sb.Next)
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@ -455,17 +483,18 @@ func (sb SubdirectoryBlock) ToBlock() disk.Block {
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copyBytes(block[0x04+i*0x27:0x04+(i+1)*0x27], desc.toBytes())
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}
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block[511] = sb.Extra
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return block
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return block, nil
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}
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// FromBlock unmarshals a Block of bytes into a SubdirectoryBlock.
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func (sb *SubdirectoryBlock) FromBlock(block disk.Block) {
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func (sb *SubdirectoryBlock) FromBlock(block disk.Block) error {
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sb.Prev = binary.LittleEndian.Uint16(block[0x0:0x2])
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sb.Next = binary.LittleEndian.Uint16(block[0x2:0x4])
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for i := range sb.Descriptors {
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sb.Descriptors[i].fromBytes(block[0x4+i*0x27 : 0x4+(i+1)*0x27])
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}
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sb.Extra = block[511]
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return nil
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}
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// Validate validates a SubdirectoryBlock for valid values.
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@ -20,7 +20,10 @@ func TestVolumeDirectoryKeyBlockMarshalRoundtrip(t *testing.T) {
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b1 := randomBlock()
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vdkb := &VolumeDirectoryKeyBlock{}
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vdkb.FromBlock(b1)
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b2 := vdkb.ToBlock()
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b2, err := vdkb.ToBlock()
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if err != nil {
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t.Fatal(err)
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}
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if b1 != b2 {
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t.Fatalf("Blocks differ: %s", strings.Join(pretty.Diff(b1[:], b2[:]), "; "))
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}
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@ -36,7 +39,10 @@ func TestVolumeDirectoryBlockMarshalRoundtrip(t *testing.T) {
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b1 := randomBlock()
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vdb := &VolumeDirectoryBlock{}
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vdb.FromBlock(b1)
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b2 := vdb.ToBlock()
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b2, err := vdb.ToBlock()
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if err != nil {
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t.Fatal(err)
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}
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if b1 != b2 {
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t.Fatalf("Blocks differ: %s", strings.Join(pretty.Diff(b1[:], b2[:]), "; "))
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}
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@ -52,7 +58,10 @@ func TestSubdirectoryKeyBlockMarshalRoundtrip(t *testing.T) {
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b1 := randomBlock()
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skb := &SubdirectoryKeyBlock{}
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skb.FromBlock(b1)
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b2 := skb.ToBlock()
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b2, err := skb.ToBlock()
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if err != nil {
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t.Fatal(err)
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}
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if b1 != b2 {
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t.Fatalf("Blocks differ: %s", strings.Join(pretty.Diff(b1[:], b2[:]), "; "))
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}
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@ -68,7 +77,10 @@ func TestSubdirectoryBlockMarshalRoundtrip(t *testing.T) {
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b1 := randomBlock()
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sb := &SubdirectoryBlock{}
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sb.FromBlock(b1)
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b2 := sb.ToBlock()
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b2, err := sb.ToBlock()
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if err != nil {
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t.Fatal(err)
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}
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if b1 != b2 {
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t.Fatalf("Blocks differ: %s", strings.Join(pretty.Diff(b1[:], b2[:]), "; "))
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}
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