1 package pq
2
3 import (
4 "bytes"
5 "encoding/binary"
6
7 "github.com/lib/pq/oid"
8 )
9
10 type readBuf []byte
11
12 func (b *readBuf) int32() (n int) {
13 n = int(int32(binary.BigEndian.Uint32(*b)))
14 *b = (*b)[4:]
15 return
16 }
17
18 func (b *readBuf) oid() (n oid.Oid) {
19 n = oid.Oid(binary.BigEndian.Uint32(*b))
20 *b = (*b)[4:]
21 return
22 }
23
24
25 func (b *readBuf) int16() (n int) {
26 n = int(binary.BigEndian.Uint16(*b))
27 *b = (*b)[2:]
28 return
29 }
30
31 func (b *readBuf) string() string {
32 i := bytes.IndexByte(*b, 0)
33 if i < 0 {
34 errorf("invalid message format; expected string terminator")
35 }
36 s := (*b)[:i]
37 *b = (*b)[i+1:]
38 return string(s)
39 }
40
41 func (b *readBuf) next(n int) (v []byte) {
42 v = (*b)[:n]
43 *b = (*b)[n:]
44 return
45 }
46
47 func (b *readBuf) byte() byte {
48 return b.next(1)[0]
49 }
50
51 type writeBuf struct {
52 buf []byte
53 pos int
54 }
55
56 func (b *writeBuf) int32(n int) {
57 x := make([]byte, 4)
58 binary.BigEndian.PutUint32(x, uint32(n))
59 b.buf = append(b.buf, x...)
60 }
61
62 func (b *writeBuf) int16(n int) {
63 x := make([]byte, 2)
64 binary.BigEndian.PutUint16(x, uint16(n))
65 b.buf = append(b.buf, x...)
66 }
67
68 func (b *writeBuf) string(s string) {
69 b.buf = append(append(b.buf, s...), '\000')
70 }
71
72 func (b *writeBuf) byte(c byte) {
73 b.buf = append(b.buf, c)
74 }
75
76 func (b *writeBuf) bytes(v []byte) {
77 b.buf = append(b.buf, v...)
78 }
79
80 func (b *writeBuf) wrap() []byte {
81 p := b.buf[b.pos:]
82 binary.BigEndian.PutUint32(p, uint32(len(p)))
83 return b.buf
84 }
85
86 func (b *writeBuf) next(c byte) {
87 p := b.buf[b.pos:]
88 binary.BigEndian.PutUint32(p, uint32(len(p)))
89 b.pos = len(b.buf) + 1
90 b.buf = append(b.buf, c, 0, 0, 0, 0)
91 }
92
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