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|
package header
import (
"bytes"
"errors"
"strconv"
"codeberg.org/lindenii/furgit/object/typ"
)
var ErrInvalidHeader = errors.New("object/header: invalid header")
// Parse parses a canonical loose-object header ("type size\x00").
func Parse(data []byte) (ty typ.Type, size uint64, consumed int, err error) {
space := bytes.IndexByte(data, ' ')
if space <= 0 {
return 0, 0, 0, ErrInvalidHeader
}
nulRel := bytes.IndexByte(data[space+1:], 0)
if nulRel < 0 {
return 0, 0, 0, ErrInvalidHeader
}
nul := space + 1 + nulRel
ty, err = typ.Parse(string(data[:space]))
if err != nil {
return 0, 0, 0, ErrInvalidHeader
}
sizeBytes := data[space+1 : nul]
if len(sizeBytes) == 0 {
return 0, 0, 0, ErrInvalidHeader
}
size, err = strconv.ParseUint(string(sizeBytes), 10, 64)
if err != nil {
return 0, 0, 0, ErrInvalidHeader
}
return ty, size, nul + 1, nil
}
|
