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Fixed a problem of adding padding of 4 zero bytes in some cases (#194) 

* Fixed a problem of adding padding of 4 zero bytes in some cases

* Incorporated review comments
This commit is contained in:
Nipun Talukdar 2017-11-04 00:46:19 +05:30 committed by Fabian Reinartz
parent b1df857819
commit 791a2dda4d
1 changed files with 8 additions and 5 deletions
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13
index.go
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@ -35,6 +35,8 @@ const (
MagicIndex = 0xBAAAD700 MagicIndex = 0xBAAAD700
indexFormatV1 = 1 indexFormatV1 = 1
size_unit = 4
) )
const indexFilename = "index" const indexFilename = "index"
@ -203,12 +205,13 @@ func (w *indexWriter) write(bufs ...[]byte) error {
return nil return nil
} }
// addPadding adds zero byte padding until the file size is a multiple of n. // addPadding adds zero byte padding until the file size is a multiple size_unit.
func (w *indexWriter) addPadding(n int) error { func (w *indexWriter) addPadding() error {
p := n - (int(w.pos) % n) p := w.pos % size_unit
if p == 0 { if p == 0 {
return nil return nil
} }
p = size_unit - p
return errors.Wrap(w.write(make([]byte, p)), "add padding") return errors.Wrap(w.write(make([]byte, p)), "add padding")
} }
@ -373,7 +376,7 @@ func (w *indexWriter) WriteLabelIndex(names []string, values []string) error {
sort.Sort(valt) sort.Sort(valt)
// Align beginning to 4 bytes for more efficient index list scans. // Align beginning to 4 bytes for more efficient index list scans.
if err := w.addPadding(4); err != nil { if err := w.addPadding(); err != nil {
return err return err
} }
@ -446,7 +449,7 @@ func (w *indexWriter) WritePostings(name, value string, it Postings) error {
} }
// Align beginning to 4 bytes for more efficient postings list scans. // Align beginning to 4 bytes for more efficient postings list scans.
if err := w.addPadding(4); err != nil { if err := w.addPadding(); err != nil {
return err return err
} }