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dat.go
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dat.go
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package fmm
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"math"
)
type PropertyTree interface {
ptree()
}
type (
PropertyTreeNone struct{}
PropertyTreeBool bool
PropertyTreeNumber float64
PropertyTreeString string
PropertyTreeList []PropertyTree
PropertyTreeDict map[string]PropertyTree
PropertyTreeSignedInteger int64
PropertyTreeUnsignedInteger uint64
)
func (self *PropertyTreeNone) ptree() {}
func (self *PropertyTreeBool) ptree() {}
func (self *PropertyTreeNumber) ptree() {}
func (self *PropertyTreeString) ptree() {}
func (self *PropertyTreeList) ptree() {}
func (self *PropertyTreeDict) ptree() {}
func (self *PropertyTreeSignedInteger) ptree() {}
func (self *PropertyTreeUnsignedInteger) ptree() {}
type ModSettings struct {
MapVersion Version
Settings PropertyTree
}
type DatReader struct {
reader *bufio.Reader
}
func newDatReader(reader io.Reader) DatReader {
return DatReader{
reader: bufio.NewReader(reader),
}
}
func (r *DatReader) Read(buf []byte) (int, error) {
return r.reader.Read(buf)
}
func (r *DatReader) ReadBool() bool {
var value bool
if err := binary.Read(r, binary.LittleEndian, &value); err != nil {
panic(err)
}
return value
}
func (r *DatReader) ReadUint8() uint8 {
value, err := r.reader.ReadByte()
if err != nil {
panic(err)
}
return uint8(value)
}
func (r *DatReader) ReadUint16() uint16 {
var value uint16
if err := binary.Read(r, binary.LittleEndian, &value); err != nil {
panic(err)
}
return value
}
func (r *DatReader) ReadUint16Optimized() uint16 {
first := r.ReadUint8()
if first < math.MaxUint8 {
return uint16(first)
}
return r.ReadUint16()
}
func (r *DatReader) ReadUint32() uint32 {
var val uint32
if err := binary.Read(r, binary.LittleEndian, &val); err != nil {
panic(err)
}
return val
}
func (r *DatReader) ReadUint32Optimized() uint32 {
first := r.ReadUint8()
if first < math.MaxUint8 {
return uint32(first)
}
return r.ReadUint32()
}
func (r *DatReader) ReadUint64() uint64 {
var val uint64
if err := binary.Read(r, binary.LittleEndian, &val); err != nil {
panic(err)
}
return val
}
func (r *DatReader) ReadInt64() int64 {
var val int64
if err := binary.Read(r, binary.LittleEndian, &val); err != nil {
panic(err)
}
return val
}
func (r *DatReader) ReadDouble() float64 {
var val float64
if err := binary.Read(r, binary.LittleEndian, &val); err != nil {
panic(err)
}
return val
}
func (r *DatReader) ReadString() string {
length := r.ReadUint32Optimized()
stringBuf := make([]byte, length)
io.ReadFull(r.reader, stringBuf)
return string(stringBuf)
}
func (r *DatReader) ReadStringOptional() string {
empty := r.ReadBool()
if empty {
return ""
}
return r.ReadString()
}
func (r *DatReader) ReadVersionOptimized(withBuild bool) Version {
ver := Version{
r.ReadUint16Optimized(),
r.ReadUint16Optimized(),
r.ReadUint16Optimized(),
}
if withBuild {
ver[3] = r.ReadUint16Optimized()
}
return ver
}
func (r *DatReader) ReadVersionUnoptimized() Version {
return Version{
r.ReadUint16(),
r.ReadUint16(),
r.ReadUint16(),
r.ReadUint16(),
}
}
func (r *DatReader) ReadModWithCRC() ModIdent {
name := r.ReadString()
version := r.ReadVersionOptimized(false)
r.ReadUint32() // CRC
return ModIdent{name, &version}
}
func (r *DatReader) ReadPropertyTree() PropertyTree {
kind := r.ReadUint8()
r.ReadBool() // Internal flag that we do not care about
switch kind {
case 0:
return &PropertyTreeNone{}
case 1:
return ptr(PropertyTreeBool(r.ReadBool()))
case 2:
return ptr(PropertyTreeNumber(r.ReadDouble()))
case 3:
return ptr(PropertyTreeString(r.ReadStringOptional()))
case 4:
length := r.ReadUint32()
res := []PropertyTree{}
for i := uint32(0); i < length; i++ {
r.ReadStringOptional()
res = append(res, r.ReadPropertyTree())
}
return ptr(PropertyTreeList(res))
case 5:
length := r.ReadUint32()
res := map[string]PropertyTree{}
for i := uint32(0); i < length; i++ {
res[r.ReadStringOptional()] = r.ReadPropertyTree()
}
return ptr(PropertyTreeDict(res))
case 6:
return ptr(PropertyTreeSignedInteger(r.ReadInt64()))
case 7:
return ptr(PropertyTreeSignedInteger(r.ReadUint64()))
}
panic(fmt.Sprintf("unknown property tree kind: %d\n", kind))
}
func (r *DatReader) ReadModSettings() ModSettings {
mapVersion := r.ReadVersionUnoptimized()
r.ReadBool() // Internal flag, always false
settings := r.ReadPropertyTree()
return ModSettings{mapVersion, settings}
}
type DatWriter struct {
writer *bufio.Writer
}
func (w *DatWriter) Write(buf []byte) (int, error) {
return w.writer.Write(buf)
}
func newDatWriter(writer io.Writer) DatWriter {
return DatWriter{
writer: bufio.NewWriter(writer),
}
}
func (w *DatWriter) WriteBool(value bool) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteUint8(value uint8) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteUint16(value uint16) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteUint16Optimized(value uint16) {
if value < math.MaxUint8 {
w.WriteUint8(uint8(value))
} else {
w.WriteUint16(value)
}
}
func (w *DatWriter) WriteUint32(value uint32) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteUint32Optimized(value uint32) {
if value < math.MaxUint8 {
w.WriteUint8(uint8(value))
} else {
w.WriteUint32(value)
}
}
func (w *DatWriter) WriteUint64(value uint64) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteInt64(value int64) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteDouble(value float64) {
binary.Write(w, binary.LittleEndian, value)
}
func (w *DatWriter) WriteString(value string) {
length := len(value)
if length > math.MaxUint32 {
panic("PropertyTree string is too long")
}
w.WriteUint32Optimized(uint32(length))
_, err := w.writer.WriteString(value)
if err != nil {
panic(err)
}
}
func (w *DatWriter) WriteStringOptional(value string) {
if value == "" {
w.WriteBool(true)
return
}
w.WriteBool(false)
w.WriteString(value)
}
func (w *DatWriter) WriteVersionUnoptimized(version Version) {
w.WriteUint16(version[0])
w.WriteUint16(version[1])
w.WriteUint16(version[2])
w.WriteUint16(version[3])
}
func (w *DatWriter) WritePropertyTree(pt PropertyTree) {
switch val := pt.(type) {
case *PropertyTreeNone:
w.WriteUint8(0) // Type
w.WriteUint8(0) // Unused internal flag
case *PropertyTreeBool:
w.WriteUint8(1) // Type
w.WriteUint8(0) // Unused internal flag
w.WriteBool(bool(*val))
case *PropertyTreeNumber:
w.WriteUint8(2) // Type
w.WriteUint8(0) // Unused internal flag
w.WriteDouble(float64(*val))
case *PropertyTreeString:
w.WriteUint8(3) // Type
w.WriteUint8(0) // Unused internal flag
w.WriteStringOptional(string(*val))
case *PropertyTreeList:
w.WriteUint8(4) // Type
w.WriteUint8(0) // Unused internal flag
list := []PropertyTree(*val)
w.WriteUint32(uint32(len(list)))
for _, child := range list {
w.WriteStringOptional("")
w.WritePropertyTree(child)
}
case *PropertyTreeDict:
w.WriteUint8(5) // Type
w.WriteUint8(0) // Unused internal flag
dict := map[string]PropertyTree(*val)
w.WriteUint32(uint32(len(dict)))
for key, child := range dict {
w.WriteStringOptional(key)
w.WritePropertyTree(child)
}
case *PropertyTreeSignedInteger:
w.WriteUint8(6) // Type
w.WriteUint8(0) // Unused internal flag
w.WriteInt64(int64(*val))
case *PropertyTreeUnsignedInteger:
w.WriteUint8(7) // Type
w.WriteUint8(0) // Unused internal flag
w.WriteUint64(uint64(*val))
}
}
func (w *DatWriter) WriteModSettings(input *ModSettings) {
w.WriteVersionUnoptimized(input.MapVersion)
w.WriteBool(false) // Internal flag, always false
w.WritePropertyTree(input.Settings)
}