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package packfile
import (
"io"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
"gopkg.in/src-d/go-git.v4/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 given storer.EncodedObjectStorer with the contents of the
// packfile.
func UpdateObjectStorage(s storer.EncodedObjectStorer, packfile io.Reader) error {
if sw, ok := s.(storer.PackfileWriter); ok {
return writePackfileToObjectStorage(sw, packfile)
}
stream := NewScanner(packfile)
d, err := NewDecoder(stream, s)
if err != nil {
return err
}
_, err = d.Decode()
return err
}
func writePackfileToObjectStorage(sw storer.PackfileWriter, packfile io.Reader) error {
var err error
w, err := sw.PackfileWriter()
if err != nil {
return err
}
defer ioutil.CheckClose(w, &err)
_, err = io.Copy(w, packfile)
return err
}
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