mirror of https://github.com/zellyn/diskii.git
71 lines
2.6 KiB
Go
71 lines
2.6 KiB
Go
// Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
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// Package disk contains routines for reading and writing various disk
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// file formats.
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package disk
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import "github.com/zellyn/diskii/types"
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// Various DOS33 disk characteristics.
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const (
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FloppyTracks = 35
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FloppySectors = 16 // Sectors per track
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// FloppyDiskBytes is the number of bytes on a DOS 3.3 disk.
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FloppyDiskBytes = 143360 // 35 tracks * 16 sectors * 256 bytes
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FloppyTrackBytes = 256 * FloppySectors // Bytes per track
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FloppyDiskBytes13Sector = 35 * 13 * 256
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)
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// Dos33LogicalToPhysicalSectorMap maps logical sector numbers to physical ones.
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// See [UtA2 9-42 - Read Routines].
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var Dos33LogicalToPhysicalSectorMap = []int{
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0x00, 0x0D, 0x0B, 0x09, 0x07, 0x05, 0x03, 0x01,
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0x0E, 0x0C, 0x0A, 0x08, 0x06, 0x04, 0x02, 0x0F,
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}
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// Dos33PhysicalToLogicalSectorMap maps physical sector numbers to logical ones.
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// See [UtA2 9-42 - Read Routines].
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var Dos33PhysicalToLogicalSectorMap = []int{
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0x00, 0x07, 0x0E, 0x06, 0x0D, 0x05, 0x0C, 0x04,
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0x0B, 0x03, 0x0A, 0x02, 0x09, 0x01, 0x08, 0x0F,
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}
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// ProDOSLogicalToPhysicalSectorMap maps logical sector numbers to pysical ones.
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// See [UtA2e 9-43 - Sectors vs. Blocks].
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var ProDOSLogicalToPhysicalSectorMap = []int{
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0x00, 0x02, 0x04, 0x06, 0x08, 0x0A, 0x0C, 0x0E,
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0x01, 0x03, 0x05, 0x07, 0x09, 0x0B, 0x0D, 0x0F,
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}
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// ProDosPhysicalToLogicalSectorMap maps physical sector numbers to logical ones.
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// See [UtA2e 9-43 - Sectors vs. Blocks].
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var ProDosPhysicalToLogicalSectorMap = []int{
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0x00, 0x08, 0x01, 0x09, 0x02, 0x0A, 0x03, 0x0B,
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0x04, 0x0C, 0x05, 0x0D, 0x06, 0x0E, 0x07, 0x0F,
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}
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// LogicalToPhysicalByName maps from "do" and "po" to the corresponding
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// logical-to-physical ordering.
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var LogicalToPhysicalByName map[types.DiskOrder][]int = map[types.DiskOrder][]int{
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types.DiskOrderDO: Dos33LogicalToPhysicalSectorMap,
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types.DiskOrderPO: ProDOSLogicalToPhysicalSectorMap,
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types.DiskOrderRaw: {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F},
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}
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// PhysicalToLogicalByName maps from "do" and "po" to the corresponding
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// physical-to-logical ordering.
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var PhysicalToLogicalByName map[types.DiskOrder][]int = map[types.DiskOrder][]int{
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types.DiskOrderDO: Dos33PhysicalToLogicalSectorMap,
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types.DiskOrderPO: ProDosPhysicalToLogicalSectorMap,
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types.DiskOrderRaw: {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F},
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}
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// TrackSector is a pair of track/sector bytes.
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type TrackSector struct {
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Track byte
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Sector byte
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}
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// Block is a ProDOS block: 512 bytes.
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type Block [512]byte
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