diff options
Diffstat (limited to 'meta.go')
-rw-r--r-- | meta.go | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/meta.go b/meta.go deleted file mode 100644 index 4212252..0000000 --- a/meta.go +++ /dev/null @@ -1,69 +0,0 @@ -package bolt - -import ( - "errors" - "hash/fnv" - "unsafe" -) - -const magic uint32 = 0xED0CDAED - -var ( - // ErrInvalid is returned when a data file is not a Bolt-formatted database. - ErrInvalid = errors.New("invalid database") - - // ErrVersionMismatch is returned when the data file was created with a - // different version of Bolt. - ErrVersionMismatch = errors.New("version mismatch") - - // ErrChecksum is returned when either meta page checksum does not match. - ErrChecksum = errors.New("checksum error") -) - -type meta struct { - magic uint32 - version uint32 - pageSize uint32 - flags uint32 - root bucket - freelist pgid - pgid pgid - txid txid - checksum uint64 -} - -// validate checks the marker bytes and version of the meta page to ensure it matches this binary. -func (m *meta) validate() error { - if m.checksum != 0 && m.checksum != m.sum64() { - return ErrChecksum - } else if m.magic != magic { - return ErrInvalid - } else if m.version != version { - return ErrVersionMismatch - } - return nil -} - -// copy copies one meta object to another. -func (m *meta) copy(dest *meta) { - *dest = *m -} - -// write writes the meta onto a page. -func (m *meta) write(p *page) { - // Page id is either going to be 0 or 1 which we can determine by the transaction ID. - p.id = pgid(m.txid % 2) - p.flags |= metaPageFlag - - // Calculate the checksum. - m.checksum = m.sum64() - - m.copy(p.meta()) -} - -// generates the checksum for the meta. -func (m *meta) sum64() uint64 { - var h = fnv.New64a() - _, _ = h.Write((*[unsafe.Offsetof(meta{}.checksum)]byte)(unsafe.Pointer(m))[:]) - return h.Sum64() -} |