forked from go-interpreter/wagon
-
Notifications
You must be signed in to change notification settings - Fork 1
/
read.go
64 lines (54 loc) · 1.24 KB
/
read.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
// Copyright 2017 The go-interpreter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wasm
import (
"encoding/binary"
"io"
"github.com/SummerCash/wagon/wasm/leb128"
)
func readBytes(r io.Reader, n int) ([]byte, error) {
bytes := make([]byte, n)
_, err := io.ReadFull(r, bytes)
if err != nil {
return bytes, err
}
return bytes, nil
}
func readBytesUint(r io.Reader) ([]byte, error) {
n, err := leb128.ReadVarUint32(r)
if err != nil {
return nil, err
}
return readBytes(r, int(n))
}
func readString(r io.Reader, n int) (string, error) {
bytes, err := readBytes(r, n)
if err != nil {
return "", err
}
return string(bytes), nil
}
func readStringUint(r io.Reader) (string, error) {
n, err := leb128.ReadVarUint32(r)
if err != nil {
return "", err
}
return readString(r, int(n))
}
func readU32(r io.Reader) (uint32, error) {
var buf [4]byte
_, err := io.ReadFull(r, buf[:])
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(buf[:]), nil
}
func readU64(r io.Reader) (uint64, error) {
var buf [8]byte
_, err := io.ReadFull(r, buf[:])
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint64(buf[:]), nil
}