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package bolt
var (
InvalidError = &Error{"Invalid database", nil}
VersionMismatchError = &Error{"version mismatch", nil}
)
const magic uint32 = 0xDEADC0DE
const version uint32 = 1
type meta struct {
magic uint32
version uint32
pageSize uint32
pgid pgid
free pgid
sys pgid
txnid txnid
}
// validate checks the marker bytes and version of the meta page to ensure it matches this binary.
func (m *meta) validate() error {
if m.magic != magic {
return InvalidError
} else if m.version != Version {
return VersionMismatchError
}
return nil
}
// copy copies one meta object to another.
func (m *meta) copy(dest *meta) {
dest.magic = m.magic
dest.version = m.version
dest.pageSize = m.pageSize
dest.pgid = m.pgid
dest.free = m.free
dest.txnid = m.txnid
dest.sys = m.sys
}
// 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 Txn ID.
p.id = pgid(m.txnid % 2)
p.flags |= p_meta
m.copy(p.meta())
}
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