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package index
import (
"io"
"gopkg.in/src-d/go-git.v4/core"
"gopkg.in/src-d/go-git.v4/formats/idxfile"
"gopkg.in/src-d/go-git.v4/formats/packfile"
)
// Index is a database of objects and their offset in a packfile.
// Objects are identified by their hash.
type Index map[core.Hash]int64
func New() Index {
return make(Index)
}
// Decode decodes a idxfile into the Index
func (i *Index) Decode(r io.Reader) error {
d := idxfile.NewDecoder(r)
idx := &idxfile.Idxfile{}
if err := d.Decode(idx); err != nil {
return err
}
for _, e := range idx.Entries {
(*i)[e.Hash] = int64(e.Offset)
}
return nil
}
// NewFrompackfile returns a new index from a packfile reader.
func NewFromPackfile(r io.Reader) (Index, core.Hash, error) {
p := packfile.NewScannerFromReader(r)
d := packfile.NewDecoder(p, nil)
checksum, err := d.Decode()
if err != nil {
return nil, core.ZeroHash, err
}
index := Index(d.Index())
return index, checksum, p.Close()
}
// Get returns the offset that an object has the packfile.
func (i Index) Get(h core.Hash) (int64, error) {
o, ok := i[h]
if !ok {
return 0, core.ErrObjectNotFound
}
return o, nil
}
// Set adds a new hash-offset pair to the index, or substitutes an existing one.
func (i Index) Set(h core.Hash, o int64) error {
/*if _, ok := i[h]; ok {
return fmt.Errorf("index.Set failed: duplicated key: %s", h)
}*/
i[h] = o
return nil
}
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