nCksum           49547 ext/sqlite3/libsqlite/sqlite3.c   const int nCksum = offsetof(WalIndexHdr, aCksum);
nCksum           49552 ext/sqlite3/libsqlite/sqlite3.c   walChecksumBytes(1, (u8*)&pWal->hdr, nCksum, 0, pWal->hdr.aCksum);