/
sfo.go
99 lines (81 loc) · 2.21 KB
/
sfo.go
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package pkg
import (
"bytes"
"encoding/binary"
"errors"
"io"
"strconv"
)
var sfoMagic = [4]byte{0x00, 0x50, 0x53, 0x46}
const (
utf8Special uint16 = 0x0004
utf8 uint16 = 0x0204
integer uint16 = 0x0404
)
type sfoHeader struct {
Magic [4]byte
Version int32
KeyTableOffset int32
DataTableOffset int32
IndexTableEntries int32
}
type sfoIndexTableEntry struct {
KeyOffset uint16
ParamFormat uint16
ParamLength uint32
ParamMaxLength uint32
DataOffset uint32
}
func (pr *Reader) readSFO(r io.Reader) (n int64, err error) {
var header sfoHeader
err = binary.Read(r, binary.LittleEndian, &header)
if err != nil {
return
}
n = int64(binary.Size(header))
if !bytes.Equal(header.Magic[:], sfoMagic[:]) {
err = errors.New("invalid SFO header")
return
}
index := make([]sfoIndexTableEntry, header.IndexTableEntries)
err = binary.Read(r, binary.LittleEndian, &index)
if err != nil {
return
}
n += int64(binary.Size(index))
keys := make([]byte, header.DataTableOffset-header.KeyTableOffset)
_, err = io.ReadFull(r, keys)
if err != nil {
return
}
n += int64(binary.Size(keys))
last := index[len(index)-1]
valuesSize := last.DataOffset + last.ParamMaxLength
values := make([]byte, valuesSize)
_, err = io.ReadFull(r, values)
if err != nil {
return
}
n += int64(valuesSize)
pr.SfoEntries = map[string]string{}
for _, entry := range index {
switch entry.ParamFormat {
case utf8Special:
n := bytes.IndexByte(keys[entry.KeyOffset:], 0)
key := string(keys[entry.KeyOffset : int(entry.KeyOffset)+n])
value := string(values[entry.DataOffset : entry.DataOffset+entry.ParamLength])
pr.SfoEntries[key] = value
case utf8:
n := bytes.IndexByte(keys[entry.KeyOffset:], 0)
key := string(keys[entry.KeyOffset : int(entry.KeyOffset)+n])
value := string(values[entry.DataOffset : entry.DataOffset+entry.ParamLength-1])
pr.SfoEntries[key] = value
case integer:
n := bytes.IndexByte(keys[entry.KeyOffset:], 0)
key := string(keys[entry.KeyOffset : int(entry.KeyOffset)+n])
value := binary.LittleEndian.Uint32(values[entry.DataOffset : entry.DataOffset+entry.ParamLength])
pr.SfoEntries[key] = strconv.Itoa(int(value))
}
}
return
}