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package packfile
import (
"io"
"github.com/go-git/go-git/v5/plumbing/storer"
"github.com/go-git/go-git/v5/utils/ioutil"
)
var signature = []byte{'P', 'A', 'C', 'K'}
const (
// VersionSupported is the packfile version supported by this package
VersionSupported uint32 = 2
firstLengthBits = uint8(4) // the first byte into object header has 4 bits to store the length
lengthBits = uint8(7) // subsequent bytes has 7 bits to store the length
maskFirstLength = 15 // 0000 1111
maskContinue = 0x80 // 1000 0000
maskLength = uint8(127) // 0111 1111
maskType = uint8(112) // 0111 0000
)
// UpdateObjectStorage updates the storer with the objects in the given
// packfile.
func UpdateObjectStorage(s storer.Storer, packfile io.Reader) error {
if pw, ok := s.(storer.PackfileWriter); ok {
return WritePackfileToObjectStorage(pw, packfile)
}
p, err := NewParserWithStorage(NewScanner(packfile), s)
if err != nil {
return err
}
_, err = p.Parse()
return err
}
// WritePackfileToObjectStorage writes all the packfile objects into the given
// object storage.
func WritePackfileToObjectStorage(
sw storer.PackfileWriter,
packfile io.Reader,
) (err error) {
w, err := sw.PackfileWriter()
if err != nil {
return err
}
defer ioutil.CheckClose(w, &err)
var n int64
n, err = io.Copy(w, packfile)
if err == nil && n == 0 {
return ErrEmptyPackfile
}
return err
}
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