mirror of https://github.com/hak5/bolt.git
64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package bolt
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var (
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InvalidMetaPageError = &Error{"Invalid meta page", nil}
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)
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// TODO: #define mm_psize mm_dbs[0].md_pad
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// TODO: #define mm_flags mm_dbs[0].md_flags
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// TODO:
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// typedef union MDB_metabuf {
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// MDB_page mb_page;
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// struct {
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// char mm_pad[PAGEHDRSZ];
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// MDB_meta mm_meta;
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// } mb_metabuf;
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// } MDB_metabuf;
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// TODO:
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// typedef struct MDB_dbx {
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// MDB_val md_name; /**< name of the database */
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// MDB_cmp_func *md_cmp; /**< function for comparing keys */
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// MDB_cmp_func *md_dcmp; /**< function for comparing data items */
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// MDB_rel_func *md_rel; /**< user relocate function */
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// void *md_relctx; /**< user-provided context for md_rel */
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// } MDB_dbx;
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const magic uint32 = 0xC0DEC0DE
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const version uint32 = 1
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type meta struct {
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magic uint32
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version uint32
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free bucket
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buckets bucket
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pgno int
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txnid int
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}
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// validate checks the marker bytes and version of the meta page to ensure it matches this binary.
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func (m *meta) validate() error {
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if m.magic != magic {
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return InvalidError
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} else if m.version != Version {
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return VersionMismatchError
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}
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return nil
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}
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// Read the environment parameters of a DB environment before
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// mapping it into memory.
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// @param[in] env the environment handle
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// @param[out] meta address of where to store the meta information
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// @return 0 on success, non-zero on failure.
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func (m *meta) read(p *page) error {
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/*
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if (off == 0 || m->mm_txnid > meta->mm_txnid)
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*meta = *m;
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}
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return 0;
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*/
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return nil
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}
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