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Switch from encoding/binary to struc

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It's not perfect, but struc can deserialize the whole thing into one
struct while encoding/binary can't. It's nice to have that.
This commit is contained in:
Nick Thomas
2020-06-09 00:35:57 +01:00
parent 65bae80d40
commit cf624cc77b
7 changed files with 118 additions and 172 deletions
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6
internal/assetstore/map.go
View File

@@ -47,7 +47,7 @@ func (a *AssetStore) Map(name string) (*Map, error) {
}
m := &Map{
Rect: raw.Rect(),
Rect: raw.Rect(),
assets: a,
raw: raw,
set: set,
@@ -74,8 +74,8 @@ func (m *Map) LoadSprites() error {
}
// FIXME: get rid of this
func (m *Map) Cell(x, y, z int) maps.Cell {
return m.raw.Cells.At(x, y, z)
func (m *Map) Cell(x, y, z int) *maps.Cell {
return m.raw.At(x, y, z)
}
// SpritesForCell returns the sprites needed to correctly render this cell.

260
internal/maps/maps.go
View File

@@ -6,12 +6,12 @@ import (
"encoding/binary"
"fmt"
"image"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"github.com/lunixbochs/struc"
)
var (
@@ -31,93 +31,105 @@ const (
cellCount = MaxHeight * MaxLength * MaxWidth
)
type Header struct {
IsCampaignMap uint32 // Tentatively: 0 = no, 1 = yes
MinWidth uint32
MinLength uint32
MaxWidth uint32
MaxLength uint32
Unknown1 uint32
Unknown2 uint32
Unknown3 uint32
Unknown4 uint32
Magic [8]byte // "\x08\x00WHMAP\x00"
Unknown5 uint32
Unknown6 uint32
SetName [8]byte // Links to a filename in `/Sets/*.set`
// Need to investigate the rest of the header too
type GameMap struct {
// Main Header
IsCampaignMap bool `struc:"uint32"` // Tentatively: 0 = no, 1 = yes
MinWidth int `struc:"uint32"`
MinLength int `struc:"uint32"`
MaxWidth int `struc:"uint32"`
MaxLength int `struc:"uint32"`
Unknown1 int `struc:"uint32"`
Unknown2 int `struc:"uint32"`
Unknown3 int `struc:"uint32"`
Unknown4 int `struc:"uint32"`
Magic []byte `struc:"[8]byte"` // "\x08\x00WHMAP\x00"
Unknown5 int `struc:"uint32"`
Unknown6 int `struc:"uint32"`
SetName string `struc:"[8]byte"` // Links to a filename in `/Sets/*.set`
Padding []byte `struc:"[212]byte"`
// Per-cell data
NumCells int `struc:"skip"` // FIXME: We can't use []Cell below without this field
Cells []Cell `struc:"[]Cell,sizefrom=NumCells"`
// Trailer header
Discard1 [3]byte `struc:"[3]byte"` // First byte is size of trailer header?
TrailerMaxWidth int `struc:"uint32"`
TrailerMaxLength int `struc:"uint32"`
TrailerMinWidth int `struc:"uint32"`
TrailerMinLength int `struc:"uint32"`
NumCharacters int `struc:"uint32"`
TrailerUnknown1 int `struc:"uint32"`
TrailerUnknown2 int `struc:"uint16"`
TrailerUnknown3 int `struc:"uint16"`
TrailerUnknown4 int `struc:"uint32"`
NumThingies int `struc:"uint32"`
Padding1 []byte `struc:"[20]byte"`
// FIXME: The rest is trash until Character & Thingy are worked out
Characters []Character `struc:"[]Character,sizefrom=NumCharacters"`
Thingies []Thingy `struc:"[]Thingy,sizefrom=NumThingies"`
Title string `struc:"[255]byte"`
Briefing string `struc:"[2048]byte"`
// Maybe? each contains either 0 or 1? Hard to say
TrailerUnknown5 []byte `struc:"[85]byte"`
}
type TrailerHeader struct {
Discard1 [3]byte // No idea what this lot is
MaxWidth uint32
MaxLength uint32
MinWidth uint32
MinLength uint32
NumCharacters uint32
Unknown1 uint32
Unknown2 uint16
Unknown3 uint16
Unknown4 uint32
NumThingies uint32
Padding1 [20]byte
}
type TrailerTrailer struct {
Title [255]byte
Briefing [2048]byte
Unknown1 [85]uint8 // Maybe? each contains either 0 or 1? Hard to say
type Cell struct {
DoorAndCanisterRelated byte `struc:"byte"`
DoorLockAndReactorRelated byte `struc:"byte"`
Unknown2 byte `struc:"byte"`
Surface ObjRef
Left ObjRef
Right ObjRef
Center ObjRef
Unknown11 byte `struc:"byte"`
Unknown12 byte `struc:"byte"`
Unknown13 byte `struc:"byte"`
Unknown14 byte `struc:"byte"`
SquadRelated byte `struc:"byte"`
}
type Character struct {
Unknown1 uint32
Unknown1 int `struc:"uint32"`
// TODO: each character may have a fixed number of subrecords for inventory
}
type Characters []Character
// TODO. These are triggers/reactors/etc.
type Thingy struct {}
type Thingy struct {
Unknown1 int `struc:"uint32"`
}
type Thingies []Thingy
func (h Header) Width() int {
return int(h.MaxWidth - h.MinWidth)
func (g *GameMap) MapSetName() string {
return g.SetName
}
func (h Header) Length() int {
return int(h.MaxLength - h.MinLength)
}
func (h Header) Height() int {
return MaxHeight
}
func (h Header) MapSetName() string {
idx := bytes.IndexByte(h.SetName[:], 0)
if idx < 0 {
idx = 8 // all 8 bytes are used
}
return string(h.SetName[0:idx:idx])
}
func (h Header) MapSetFilename() string {
return h.MapSetName() + ".set"
func (g *GameMap) MapSetFilename() string {
return g.MapSetName() + ".set"
}
type ObjRef struct {
AreaByte byte
SpriteAndFlagByte byte
AreaByte byte `struc:"byte"`
SpriteAndFlagByte byte `struc:"byte"`
}
// The index into a set palette to retrieve the object
func (o ObjRef) Index() int {
func (o *ObjRef) Index() int {
return int(o.AreaByte)
}
func (o ObjRef) Sprite() int {
func (o *ObjRef) Sprite() int {
// The top bit seems to be a flag of some kind
return int(o.SpriteAndFlagByte & 0x7f)
}
@@ -127,21 +139,6 @@ func (o ObjRef) IsActive() bool {
return (o.SpriteAndFlagByte & 0x80) == 0x80
}
type Cell struct {
DoorAndCanisterRelated byte
DoorLockAndReactorRelated byte
Unknown2 byte
Surface ObjRef
Left ObjRef
Right ObjRef
Center ObjRef
Unknown11 byte
Unknown12 byte
Unknown13 byte
Unknown14 byte
SquadRelated byte
}
func (c *Cell) At(n int) byte {
switch n {
case 0:
@@ -181,46 +178,26 @@ func (c *Cell) At(n int) byte {
return 0
}
// Cells is always a fixed size; use At to get a cell according to x,y,z
type Cells []Cell
func (c Cells) At(x, y, z int) Cell {
return c[(z*MaxLength*MaxWidth)+(y*MaxWidth)+x]
func (g *GameMap) At(x, y, z int) *Cell {
return &g.Cells[(z*MaxLength*MaxWidth)+(y*MaxWidth)+x]
}
func (h Header) Check() []error {
var out []error
if h.IsCampaignMap > 1 {
out = append(out, fmt.Errorf("Expected 0 or 1 for IsCampaignMap, got %v", h.IsCampaignMap))
func (g *GameMap) Check() error {
if bytes.Compare(expectedMagic, g.Magic) != 0 {
return fmt.Errorf("Unexpected magic value: %v", g.Magic)
}
if bytes.Compare(expectedMagic, h.Magic[:]) != 0 {
out = append(out, fmt.Errorf("Unexpected magic value: %v", h.Magic))
}
// TODO: other consistency checks
return out
}
type GameMap struct {
Header
Cells
TrailerHeader
Characters
Thingies
TrailerTrailer
// TODO: parse this into sections. This is the text that comes from the
// .TXT file. Maybe we don't need it at all since it should be duplicated in
// the trailer.
Text string
return nil
}
func (m *GameMap) Rect() image.Rectangle {
return image.Rect(
int(m.Header.MinWidth),
int(m.Header.MinLength),
int(m.Header.MaxWidth),
int(m.Header.MaxLength),
int(m.MinWidth),
int(m.MinLength),
int(m.MaxWidth),
int(m.MaxLength),
)
}
@@ -243,23 +220,17 @@ func LoadGameMap(prefix string) (*GameMap, error) {
return nil, fmt.Errorf("Couldn't find %s.{map,txt}, even ignoring case", prefix)
}
// A game map is composed of two files: .map and .txt
// A game map is composed of two files: .map and .txt. We ignore the text file,
// since the content is replicated in the map file.
func LoadGameMapByFiles(mapFile, txtFile string) (*GameMap, error) {
out, err := loadMapFile(mapFile)
if err != nil {
return nil, err
}
// TODO: load text and parse into sections
txt, err := ioutil.ReadFile(txtFile)
if err != nil {
if err := out.Check(); err != nil {
return nil, err
}
out.Text = string(txt)
for _, err := range out.Check() {
log.Printf("%s: %v", mapFile, err)
}
return out, nil
}
@@ -297,6 +268,7 @@ func LoadGameMaps(dir string) (map[string]*GameMap, error) {
func loadMapFile(filename string) (*GameMap, error) {
var out GameMap
out.NumCells = cellCount
mf, err := os.Open(filename)
if err != nil {
@@ -312,52 +284,18 @@ func loadMapFile(filename string) (*GameMap, error) {
defer zr.Close()
if err := binary.Read(zr, binary.LittleEndian, &out.Header); err != nil {
return nil, fmt.Errorf("Error parsing %s: %v", filename, err)
}
// no gzip.SeekReader, so discard unread header bytes for now
discardSize := int64(cellDataOffset - binary.Size(&out.Header))
if _, err := io.CopyN(ioutil.Discard, zr, discardSize); err != nil {
if err := struc.UnpackWithOrder(zr, &out, binary.LittleEndian); err != nil {
return nil, err
}
out.Cells = make(Cells, cellCount)
if err := binary.Read(zr, binary.LittleEndian, &out.Cells); err != nil {
return nil, fmt.Errorf("Error parsing cells for %s: %v", filename, err)
}
// Trim any trailing nulls off of the strings
trimRight(&out.SetName)
trimRight(&out.Title)
trimRight(&out.Briefing)
if err := binary.Read(zr, binary.LittleEndian, &out.TrailerHeader); err != nil {
return nil, fmt.Errorf("Error parsing trailer header for %s: %v", filename, err)
}
log.Printf("Trailer Header: %#+v", out.TrailerHeader)
/*
// TODO: until we know how large each character record should be, we can't read this lot
out.Characters = make(Characters, int(out.TrailerHeader.NumCharacters))
if err := binary.Read(zr, binary.LittleEndian, &out.Characters); err != nil {
return nil, fmt.Errorf("Error parsing characters for %s: %v", filename, err)
}
out.Thingies = make(Thingies, int(out.TrailerHeader.NumThingies))
if err := binary.Read(zr, binary.LittleEndian, &out.Thingies); err != nil {
return nil, fmt.Errorf("Error parsing thingies for %s: %v", filename, err)
}
if err := binary.Read(zr, binary.LittleEndian, &out.TrailerTrailer); err != nil {
return nil, fmt.Errorf("Error parsing trailer trailer for %s: %v", filename, err)
}
log.Printf("Trailer Trailer: %s", out.TrailerTrailer.String())
*/
return &out, nil
}
func (t *TrailerTrailer) String() string {
return fmt.Sprintf(
"title=%q briefing=%q rest=%#+v",
strings.TrimRight(string(t.Title[:]), "\x00"),
strings.TrimRight(string(t.Briefing[:]), "\x00"),
t.Unknown1,
)
func trimRight(s *string) {
*s = strings.TrimRight(*s, "\x00")
}

2
internal/scenario/manage.go
View File

@@ -9,7 +9,7 @@ type CellPoint struct {
Z int
}
func (s *Scenario) CellAtCursor() (maps.Cell, CellPoint) {
func (s *Scenario) CellAtCursor() (*maps.Cell, CellPoint) {
cell := s.area.Cell(int(s.selectedCell.X), int(s.selectedCell.Y), 0)
return cell, CellPoint{IsoPt: s.selectedCell, Z: 0}
}