92 lines
1.6 KiB
Go
92 lines
1.6 KiB
Go
package pq
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import (
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"bytes"
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"encoding/binary"
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"github.com/lib/pq/oid"
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)
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type readBuf []byte
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func (b *readBuf) int32() (n int) {
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n = int(int32(binary.BigEndian.Uint32(*b)))
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*b = (*b)[4:]
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return
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}
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func (b *readBuf) oid() (n oid.Oid) {
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n = oid.Oid(binary.BigEndian.Uint32(*b))
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*b = (*b)[4:]
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return
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}
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// N.B: this is actually an unsigned 16-bit integer, unlike int32
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func (b *readBuf) int16() (n int) {
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n = int(binary.BigEndian.Uint16(*b))
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*b = (*b)[2:]
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return
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}
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func (b *readBuf) string() string {
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i := bytes.IndexByte(*b, 0)
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if i < 0 {
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errorf("invalid message format; expected string terminator")
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}
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s := (*b)[:i]
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*b = (*b)[i+1:]
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return string(s)
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}
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func (b *readBuf) next(n int) (v []byte) {
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v = (*b)[:n]
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*b = (*b)[n:]
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return
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}
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func (b *readBuf) byte() byte {
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return b.next(1)[0]
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}
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type writeBuf struct {
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buf []byte
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pos int
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}
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func (b *writeBuf) int32(n int) {
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x := make([]byte, 4)
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binary.BigEndian.PutUint32(x, uint32(n))
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b.buf = append(b.buf, x...)
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}
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func (b *writeBuf) int16(n int) {
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x := make([]byte, 2)
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binary.BigEndian.PutUint16(x, uint16(n))
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b.buf = append(b.buf, x...)
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}
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func (b *writeBuf) string(s string) {
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b.buf = append(b.buf, (s + "\000")...)
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}
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func (b *writeBuf) byte(c byte) {
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b.buf = append(b.buf, c)
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}
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func (b *writeBuf) bytes(v []byte) {
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b.buf = append(b.buf, v...)
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}
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func (b *writeBuf) wrap() []byte {
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p := b.buf[b.pos:]
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binary.BigEndian.PutUint32(p, uint32(len(p)))
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return b.buf
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}
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func (b *writeBuf) next(c byte) {
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p := b.buf[b.pos:]
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binary.BigEndian.PutUint32(p, uint32(len(p)))
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b.pos = len(b.buf) + 1
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b.buf = append(b.buf, c, 0, 0, 0, 0)
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}
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