test_03.bt

BigEndian();
#define PAGE_SIZE (16 * 1024)

typedef ubyte u1;
typedef uint16 u2;
typedef uint32 u4;
typedef uint64 u8;
typedef byte i1;
typedef int16 i2;
typedef int32 i4;

enum <u2> PAGE_TYPE {
	 FIL_PAGE_INDEX	=	17855,	/*!< B-tree node */
	 FIL_PAGE_RTREE	=	17854,	/*!< B-tree node */
	 FIL_PAGE_UNDO_LOG	=2,	/*!< Undo log page */
	 FIL_PAGE_INODE		=3	,/*!< Index node */
	 FIL_PAGE_IBUF_FREE_LIST	=4,	/*!< Insert buffer free list */ /* File page types introduced in MySQL/InnoDB 5.1.7 */
	 FIL_PAGE_TYPE_ALLOCATED	=0	,/*!< Freshly allocated page */
	 FIL_PAGE_IBUF_BITMAP	=5 ,	/*!< Insert buffer bitmap */
	 FIL_PAGE_TYPE_SYS	=6	,/*!< System page */
	 FIL_PAGE_TYPE_TRX_SYS	=7,	/*!< Transaction system data */
	 FIL_PAGE_TYPE_FSP_HDR	=8	,/*!< File space header */
	 FIL_PAGE_TYPE_XDES	=9	,/*!< Extent descriptor page */
	 FIL_PAGE_TYPE_BLOB	=10	,/*!< Uncompressed BLOB page */
	 FIL_PAGE_TYPE_ZBLOB	=11	,/*!< First compressed BLOB page */
	 FIL_PAGE_TYPE_ZBLOB2	=12	,/*!< Subsequent compressed BLOB page */
	 FIL_PAGE_TYPE_UNKNOWN	=13	,/*!< In old tablespaces, garbage in FIL_PAGE_TYPE is replaced with this value when flushing pages. */
	 FIL_PAGE_COMPRESSED	=14	,/*!< Compressed page */
	 FIL_PAGE_ENCRYPTED	=15	,/*!< Encrypted page */
	 FIL_PAGE_COMPRESSED_AND_ENCRYPTED =16  , /*!< Compressed and Encrypted page */
	 FIL_PAGE_ENCRYPTED_RTREE =17,	/*!< Encrypted R-tree page */
};

// 38 字节的 File Header，存储了页的一些通用信息
typedef struct FilHeader {
    u4 FIL_PAGE_SPACE_OR_CHKSUM<format=hex,comment="页的校验和（checksum值）">;
    u4 FIL_PAGE_OFFSET<fgcolor=0xFF0000,comment="页号">;
    u4 FIL_PAGE_PREV<comment="上一个页的页号">;
    u4 FIL_PAGE_NEXT<comment="下一个页的页号">;
    u8 FIL_PAGE_LSN<comment="页面被最后修改时对应的日志序列位置（英文名是：Log Sequence Number）">;
    PAGE_TYPE FIL_PAGE_TYPE;
    u8 FIL_PAGE_FILE_FLUSH_LSN<comment="仅在系统表空间的一个页中定义，代表文件至少被刷新到了对应的LSN值">;
    u4 FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID<comment="页属于哪个表空间">;
};

// 定义一个 Page 结构体
typedef struct Page(int index) {
	FilHeader file_header;
	byte unparsed[PAGE_SIZE - sizeof(file_header)];
};


local int file_size = FileSize();
local int i;
for (i = 0; i < file_size / PAGE_SIZE; ++i) {
	Page page(i); // 读取 16KB 的内容映射到 Page 结构体中
}