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package bolt
var (
InvalidMetaPageError = &Error{"Invalid meta page", nil}
)
// TODO: #define mm_psize mm_dbs[0].md_pad
// TODO: #define mm_flags mm_dbs[0].md_flags
// TODO:
// typedef union MDB_metabuf {
// MDB_page mb_page;
// struct {
// char mm_pad[PAGEHDRSZ];
// MDB_meta mm_meta;
// } mb_metabuf;
// } MDB_metabuf;
// TODO:
// typedef struct MDB_dbx {
// MDB_val md_name; /**< name of the database */
// MDB_cmp_func *md_cmp; /**< function for comparing keys */
// MDB_cmp_func *md_dcmp; /**< function for comparing data items */
// MDB_rel_func *md_rel; /**< user relocate function */
// void *md_relctx; /**< user-provided context for md_rel */
// } MDB_dbx;
const magic uint32 = 0xC0DEC0DE
const version uint32 = 1
type meta struct {
magic uint32
version uint32
free bucket
buckets bucket
pgno int
txnid int
}
// 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
}
// Read the environment parameters of a DB environment before
// mapping it into memory.
// @param[in] env the environment handle
// @param[out] meta address of where to store the meta information
// @return 0 on success, non-zero on failure.
func (m *meta) read(p *page) error {
/*
if (off == 0 || m->mm_txnid > meta->mm_txnid)
*meta = *m;
}
return 0;
*/
return nil
}
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