-
Notifications
You must be signed in to change notification settings - Fork 0
/
read_header.go
64 lines (59 loc) · 1.69 KB
/
read_header.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
package info
import (
"bytes"
"encoding/binary"
"fmt"
"io"
)
func ReadHeader(reader io.Reader, header *Header) (err error) {
// read header size
var header_size uint32
if err = binary.Read(reader, binary.LittleEndian, &header_size); err != nil {
return err
}
if header_size > MaxHeaderSize {
return fmt.Errorf("info: header size is too large (%d)", header_size)
}
// read header data
header_data := make([]byte, header_size)
if _, err = io.ReadFull(reader, header_data); err != nil {
return
}
header_reader := bytes.NewReader(header_data)
// read first segment of header (version 1.0)
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header0); err != nil {
return err
}
switch header.Version {
case 0:
// nothing further to read
case 1:
// read MPQ v2 header
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header1); err != nil {
return err
}
case 2:
// read MPQ v3 header
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header1); err != nil {
return err
}
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header2); err != nil {
return err
}
case 3:
// read MPQ v4 header
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header1); err != nil {
return err
}
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header2); err != nil {
return err
}
if err = binary.Read(header_reader, binary.LittleEndian, &header.Header3); err != nil {
return err
}
default:
err = fmt.Errorf("info: error while reading Header: unknown format version (%d)", header.Version)
}
header_reader = nil
return
}