/
common.go
57 lines (51 loc) · 1.14 KB
/
common.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright © 2021 Wrangle Ltd
package objects
import (
"fmt"
"io"
"github.com/wrgl/core/pkg/encoding"
)
func writeLine(w io.Writer, label string, b []byte) (n int, err error) {
for _, sl := range [][]byte{
[]byte(label), {' '}, b, {'\n'},
} {
m, err := w.Write(sl)
if err != nil {
return 0, err
}
n += m
}
return
}
func consumeStr(p *encoding.Parser, s string) (int, error) {
n := len(s)
b, err := p.NextBytes(n)
if err != nil {
return 0, err
}
if string(b) != s {
return 0, p.ParseError("expected string %q, received %q", s, string(b))
}
return n, nil
}
func readLine(p *encoding.Parser, label string, f encoding.DecodeFunc) (int, error) {
total, err := consumeStr(p, fmt.Sprintf("%s ", label))
if err == io.EOF {
return 0, io.EOF
}
if err != nil {
return 0, fmt.Errorf("error reading label %q: %v", label, err)
}
n, err := f(p)
if err != nil {
return 0, fmt.Errorf("error reading label %q: %v", label, err)
}
total += n
n, err = consumeStr(p, "\n")
if err != nil {
return 0, fmt.Errorf("error reading label %q: %v", label, err)
}
total += n
return total, nil
}