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package pack
import (
"bytes"
"fmt"
"io"
"strings"
)
// delayedObjectReader provides an interface for reading from an Object while
// loading object data into memory only on demand. It implements io.ReadCloser.
type delayedObjectReader struct {
obj *Object
mr io.Reader
}
// Read implements the io.Reader method by instantiating a new underlying reader
// only on demand.
func (d *delayedObjectReader) Read(b []byte) (int, error) {
if d.mr == nil {
data, err := d.obj.Unpack()
if err != nil {
return 0, err
}
d.mr = io.MultiReader(
// Git object header:
strings.NewReader(fmt.Sprintf("%s %d\x00",
d.obj.Type(), len(data),
)),
// Git object (uncompressed) contents:
bytes.NewReader(data),
)
}
return d.mr.Read(b)
}
// Close implements the io.Closer interface.
func (d *delayedObjectReader) Close() error {
return nil
}
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