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pma: move BT_meta.chk to end of struct. hardcode 32 roots

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barter-simsum 2023-11-29 13:03:57 -05:00
parent 857c0051d9
commit 96b31ffe7f
1 changed files with 3 additions and 6 deletions
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9
rust/ares_pma/c-src/btree.c
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@ -233,6 +233,7 @@ static_assert(BT_DAT_MAXBYTES % sizeof(BT_dat) == 0);
#define BLK_BASE_LEN7 (BLK_BASE_LEN6 * 4)
typedef struct BT_meta BT_meta;
struct BT_meta {
#define BT_NUMROOTS 32
uint32_t magic;
uint32_t version;
pgno_t last_pg; /* last page used in file */
@ -252,13 +253,9 @@ struct BT_meta {
uint8_t flags;
uint8_t _pad1;
pgno_t root;
/* ;;: confirm: shouldn't the checksum actually follow the roots array? */
/* 64bit alignment manually checked - 72 bytes total above */
uint64_t roots[BT_NUMROOTS]; /* for usage by ares */
uint32_t chk; /* checksum */
/* 64bit alignment manually checked */
uint64_t roots[]; /* for usage by ares */
/* ;;: TODO: ensure the crc_32 checksum cannot be zero */
} __packed;
static_assert(sizeof(BT_meta) <= BT_DAT_MAXBYTES);