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th6_replay.go
67 lines (62 loc) · 1.59 KB
/
th6_replay.go
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package threp
import (
"encoding/binary"
"github.com/pkg/errors"
"io"
"math"
)
func DecodeTh6Replay(fin io.Reader) (*OldRepInfo, error) {
dat := make([]byte, 4)
n, err := fin.Read(dat)
if err != nil {
return nil, err
}
if n < 4 {
return nil, errors.New("not a replay")
}
if string(dat) != "T6RP" {
return nil, errors.New("not a th06 replay")
}
return decodeTh6Replay(fin)
}
func decodeTh6Replay(fin io.Reader) (*OldRepInfo, error) {
dat := make([]byte, 0x30)
n, err := fin.Read(dat[4:])
if n < 0x30-4 {
return nil, errors.New("not a replay")
}
if err != nil {
return nil, err
}
// Decryption
dat2 := make([]byte, 0, len(dat))
mask := dat[0x0e]
for i := 0; i < 0x0f; i++ {
dat2 = append(dat2, dat[i])
}
for i := 0x0f; i < len(dat); i++ {
dat2 = append(dat2, byte(uint16(dat[i])+0x100-uint16(mask)))
mask = byte((uint16(mask) + 0x07) & 0xff)
}
// check
if dat2[0x06] > 0x04 || dat2[0x07] > 0x05 {
return nil, errors.New("decrypt th6 replay failed")
}
// replay info
date := string(dat2[0x10 : 0x10+8])
name := string(dat2[0x19 : 0x19+8])
char := dat2[0x06]
rank := dat2[0x07]
score := binary.LittleEndian.Uint32(dat2[0x24 : 0x24+4])
drop := math.Float32frombits(binary.LittleEndian.Uint32(dat2[0x2c : 0x2c+4]))
return &OldRepInfo{
game: "6",
Date: "20" + date[6:8] + "/" + date[:2] + "/" + date[3:5],
Player: trimNull(name),
Char: safeIndex([]string{"ReimuA", "ReimuB", "MarisaA", "MarisaB"}, char),
Score: int64(score),
Rank: safeIndex([]string{"Easy", "Normal", "Hard", "Lunatic", "Extra"}, rank),
Version: "",
Drop: drop,
}, nil
}