mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 13:32:33 +01:00
c488e4b928
Bugs fixed: - Bug #20791 valgrind errors in InnoDB Remove Valgrind warning of Bug #20791 : in new database creation, we read the doublewrite buffer magic number from uninitialized memory; the code worked because it was extremely unlikely that the memory would contain the magic number - Bug #21784 DROP TABLE crashes 5.1.12-pre if concurrent queries on the table remove update_thd() in ::store_lock() Also includes numerous coding style fixes, etc. See file-level comments for details.
691 lines
16 KiB
Text
691 lines
16 KiB
Text
/**********************************************************************
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Utilities for converting data from the database file
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to the machine format.
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(c) 1995 Innobase Oy
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Created 11/28/1995 Heikki Tuuri
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***********************************************************************/
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/***********************************************************
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The following function is used to store data in one byte. */
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UNIV_INLINE
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void
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mach_write_to_1(
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/*============*/
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byte* b, /* in: pointer to byte where to store */
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ulint n) /* in: ulint integer to be stored, >= 0, < 256 */
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{
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ut_ad(b);
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ut_ad(n <= 0xFFUL);
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b[0] = (byte)n;
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}
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/************************************************************
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The following function is used to fetch data from one byte. */
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UNIV_INLINE
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ulint
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mach_read_from_1(
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/*=============*/
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/* out: ulint integer, >= 0, < 256 */
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byte* b) /* in: pointer to byte */
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{
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ut_ad(b);
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return((ulint)(b[0]));
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}
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/***********************************************************
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The following function is used to store data in two consecutive
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bytes. We store the most significant byte to the lowest address. */
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UNIV_INLINE
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void
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mach_write_to_2(
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/*============*/
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byte* b, /* in: pointer to two bytes where to store */
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ulint n) /* in: ulint integer to be stored */
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{
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ut_ad(b);
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ut_ad(n <= 0xFFFFUL);
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b[0] = (byte)(n >> 8);
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b[1] = (byte)(n);
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}
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/************************************************************
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The following function is used to fetch data from 2 consecutive
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bytes. The most significant byte is at the lowest address. */
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UNIV_INLINE
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ulint
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mach_read_from_2(
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/*=============*/
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/* out: ulint integer */
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byte* b) /* in: pointer to 2 bytes */
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{
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ut_ad(b);
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return( ((ulint)(b[0]) << 8)
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+ (ulint)(b[1])
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);
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}
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/************************************************************
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The following function is used to convert a 16-bit data item
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to the canonical format, for fast bytewise equality test
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against memory. */
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UNIV_INLINE
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uint16
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mach_encode_2(
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/*==========*/
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/* out: 16-bit integer in canonical format */
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ulint n) /* in: integer in machine-dependent format */
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{
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uint16 ret;
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ut_ad(2 == sizeof ret);
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mach_write_to_2((byte*) &ret, n);
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return(ret);
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}
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/************************************************************
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The following function is used to convert a 16-bit data item
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from the canonical format, for fast bytewise equality test
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against memory. */
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UNIV_INLINE
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ulint
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mach_decode_2(
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/*==========*/
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/* out: integer in machine-dependent format */
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uint16 n) /* in: 16-bit integer in canonical format */
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{
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ut_ad(2 == sizeof n);
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return(mach_read_from_2((byte*) &n));
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}
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/***********************************************************
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The following function is used to store data in 3 consecutive
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bytes. We store the most significant byte to the lowest address. */
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UNIV_INLINE
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void
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mach_write_to_3(
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/*============*/
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byte* b, /* in: pointer to 3 bytes where to store */
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ulint n) /* in: ulint integer to be stored */
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{
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ut_ad(b);
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ut_ad(n <= 0xFFFFFFUL);
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b[0] = (byte)(n >> 16);
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b[1] = (byte)(n >> 8);
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b[2] = (byte)(n);
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}
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/************************************************************
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The following function is used to fetch data from 3 consecutive
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bytes. The most significant byte is at the lowest address. */
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UNIV_INLINE
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ulint
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mach_read_from_3(
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/*=============*/
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/* out: ulint integer */
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byte* b) /* in: pointer to 3 bytes */
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{
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ut_ad(b);
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return( ((ulint)(b[0]) << 16)
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+ ((ulint)(b[1]) << 8)
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+ (ulint)(b[2])
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);
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}
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/***********************************************************
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The following function is used to store data in four consecutive
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bytes. We store the most significant byte to the lowest address. */
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UNIV_INLINE
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void
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mach_write_to_4(
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/*============*/
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byte* b, /* in: pointer to four bytes where to store */
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ulint n) /* in: ulint integer to be stored */
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{
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ut_ad(b);
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b[0] = (byte)(n >> 24);
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b[1] = (byte)(n >> 16);
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b[2] = (byte)(n >> 8);
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b[3] = (byte)n;
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}
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/************************************************************
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The following function is used to fetch data from 4 consecutive
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bytes. The most significant byte is at the lowest address. */
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UNIV_INLINE
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ulint
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mach_read_from_4(
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/*=============*/
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/* out: ulint integer */
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byte* b) /* in: pointer to four bytes */
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{
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ut_ad(b);
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return( ((ulint)(b[0]) << 24)
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+ ((ulint)(b[1]) << 16)
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+ ((ulint)(b[2]) << 8)
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+ (ulint)(b[3])
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);
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}
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/*************************************************************
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Writes a ulint in a compressed form where the first byte codes the
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length of the stored ulint. We look at the most significant bits of
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the byte. If the most significant bit is zero, it means 1-byte storage,
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else if the 2nd bit is 0, it means 2-byte storage, else if 3rd is 0,
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it means 3-byte storage, else if 4th is 0, it means 4-byte storage,
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else the storage is 5-byte. */
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UNIV_INLINE
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ulint
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mach_write_compressed(
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/*==================*/
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/* out: compressed size in bytes */
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byte* b, /* in: pointer to memory where to store */
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ulint n) /* in: ulint integer (< 2^32) to be stored */
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{
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ut_ad(b);
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if (n < 0x80UL) {
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mach_write_to_1(b, n);
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return(1);
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} else if (n < 0x4000UL) {
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mach_write_to_2(b, n | 0x8000UL);
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return(2);
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} else if (n < 0x200000UL) {
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mach_write_to_3(b, n | 0xC00000UL);
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return(3);
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} else if (n < 0x10000000UL) {
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mach_write_to_4(b, n | 0xE0000000UL);
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return(4);
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} else {
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mach_write_to_1(b, 0xF0UL);
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mach_write_to_4(b + 1, n);
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return(5);
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}
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}
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/*************************************************************
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Returns the size of a ulint when written in the compressed form. */
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UNIV_INLINE
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ulint
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mach_get_compressed_size(
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/*=====================*/
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/* out: compressed size in bytes */
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ulint n) /* in: ulint integer (< 2^32) to be stored */
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{
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if (n < 0x80UL) {
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return(1);
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} else if (n < 0x4000UL) {
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return(2);
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} else if (n < 0x200000UL) {
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return(3);
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} else if (n < 0x10000000UL) {
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return(4);
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} else {
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return(5);
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}
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}
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/*************************************************************
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Reads a ulint in a compressed form. */
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UNIV_INLINE
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ulint
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mach_read_compressed(
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/*=================*/
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/* out: read integer (< 2^32) */
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byte* b) /* in: pointer to memory from where to read */
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{
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ulint flag;
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ut_ad(b);
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flag = mach_read_from_1(b);
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if (flag < 0x80UL) {
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return(flag);
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} else if (flag < 0xC0UL) {
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return(mach_read_from_2(b) & 0x7FFFUL);
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} else if (flag < 0xE0UL) {
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return(mach_read_from_3(b) & 0x3FFFFFUL);
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} else if (flag < 0xF0UL) {
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return(mach_read_from_4(b) & 0x1FFFFFFFUL);
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} else {
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ut_ad(flag == 0xF0UL);
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return(mach_read_from_4(b + 1));
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}
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}
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/***********************************************************
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The following function is used to store data in 8 consecutive
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bytes. We store the most significant byte to the lowest address. */
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UNIV_INLINE
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void
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mach_write_to_8(
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/*============*/
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byte* b, /* in: pointer to 8 bytes where to store */
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dulint n) /* in: dulint integer to be stored */
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{
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ut_ad(b);
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mach_write_to_4(b, ut_dulint_get_high(n));
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mach_write_to_4(b + 4, ut_dulint_get_low(n));
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}
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/************************************************************
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The following function is used to fetch data from 8 consecutive
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bytes. The most significant byte is at the lowest address. */
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UNIV_INLINE
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dulint
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mach_read_from_8(
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/*=============*/
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/* out: dulint integer */
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byte* b) /* in: pointer to 8 bytes */
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{
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ulint high;
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ulint low;
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ut_ad(b);
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high = mach_read_from_4(b);
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low = mach_read_from_4(b + 4);
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return(ut_dulint_create(high, low));
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}
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/***********************************************************
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The following function is used to store data in 7 consecutive
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bytes. We store the most significant byte to the lowest address. */
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UNIV_INLINE
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void
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mach_write_to_7(
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/*============*/
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byte* b, /* in: pointer to 7 bytes where to store */
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dulint n) /* in: dulint integer to be stored */
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{
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ut_ad(b);
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mach_write_to_3(b, ut_dulint_get_high(n));
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mach_write_to_4(b + 3, ut_dulint_get_low(n));
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}
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/************************************************************
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The following function is used to fetch data from 7 consecutive
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bytes. The most significant byte is at the lowest address. */
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UNIV_INLINE
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dulint
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mach_read_from_7(
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/*=============*/
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/* out: dulint integer */
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byte* b) /* in: pointer to 7 bytes */
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{
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ulint high;
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ulint low;
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ut_ad(b);
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high = mach_read_from_3(b);
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low = mach_read_from_4(b + 3);
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return(ut_dulint_create(high, low));
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}
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/***********************************************************
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The following function is used to store data in 6 consecutive
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bytes. We store the most significant byte to the lowest address. */
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UNIV_INLINE
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void
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mach_write_to_6(
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/*============*/
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byte* b, /* in: pointer to 6 bytes where to store */
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dulint n) /* in: dulint integer to be stored */
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{
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ut_ad(b);
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mach_write_to_2(b, ut_dulint_get_high(n));
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mach_write_to_4(b + 2, ut_dulint_get_low(n));
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}
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/************************************************************
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The following function is used to fetch data from 6 consecutive
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bytes. The most significant byte is at the lowest address. */
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UNIV_INLINE
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dulint
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mach_read_from_6(
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/*=============*/
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/* out: dulint integer */
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byte* b) /* in: pointer to 7 bytes */
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{
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ulint high;
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ulint low;
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ut_ad(b);
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high = mach_read_from_2(b);
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low = mach_read_from_4(b + 2);
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return(ut_dulint_create(high, low));
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}
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/*************************************************************
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Writes a dulint in a compressed form (5..9 bytes). */
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UNIV_INLINE
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ulint
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mach_dulint_write_compressed(
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/*=========================*/
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/* out: size in bytes */
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byte* b, /* in: pointer to memory where to store */
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dulint n) /* in: dulint integer to be stored */
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{
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ulint size;
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ut_ad(b);
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size = mach_write_compressed(b, ut_dulint_get_high(n));
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mach_write_to_4(b + size, ut_dulint_get_low(n));
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return(size + 4);
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}
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/*************************************************************
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Returns the size of a dulint when written in the compressed form. */
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UNIV_INLINE
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ulint
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mach_dulint_get_compressed_size(
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/*============================*/
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/* out: compressed size in bytes */
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dulint n) /* in: dulint integer to be stored */
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{
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return(4 + mach_get_compressed_size(ut_dulint_get_high(n)));
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}
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/*************************************************************
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Reads a dulint in a compressed form. */
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UNIV_INLINE
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dulint
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mach_dulint_read_compressed(
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/*========================*/
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/* out: read dulint */
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byte* b) /* in: pointer to memory from where to read */
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{
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ulint high;
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ulint low;
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ulint size;
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ut_ad(b);
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high = mach_read_compressed(b);
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size = mach_get_compressed_size(high);
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low = mach_read_from_4(b + size);
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return(ut_dulint_create(high, low));
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}
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/*************************************************************
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Writes a dulint in a compressed form (1..11 bytes). */
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UNIV_INLINE
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ulint
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mach_dulint_write_much_compressed(
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/*==============================*/
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/* out: size in bytes */
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byte* b, /* in: pointer to memory where to store */
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dulint n) /* in: dulint integer to be stored */
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{
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ulint size;
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ut_ad(b);
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if (ut_dulint_get_high(n) == 0) {
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return(mach_write_compressed(b, ut_dulint_get_low(n)));
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}
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*b = (byte)0xFF;
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size = 1 + mach_write_compressed(b + 1, ut_dulint_get_high(n));
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size += mach_write_compressed(b + size, ut_dulint_get_low(n));
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return(size);
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}
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/*************************************************************
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Returns the size of a dulint when written in the compressed form. */
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UNIV_INLINE
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ulint
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mach_dulint_get_much_compressed_size(
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/*=================================*/
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/* out: compressed size in bytes */
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dulint n) /* in: dulint integer to be stored */
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{
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if (0 == ut_dulint_get_high(n)) {
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return(mach_get_compressed_size(ut_dulint_get_low(n)));
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}
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return(1 + mach_get_compressed_size(ut_dulint_get_high(n))
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+ mach_get_compressed_size(ut_dulint_get_low(n)));
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}
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/*************************************************************
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Reads a dulint in a compressed form. */
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UNIV_INLINE
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dulint
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mach_dulint_read_much_compressed(
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/*=============================*/
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/* out: read dulint */
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byte* b) /* in: pointer to memory from where to read */
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{
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ulint high;
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ulint low;
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ulint size;
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ut_ad(b);
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if (*b != (byte)0xFF) {
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high = 0;
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size = 0;
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} else {
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high = mach_read_compressed(b + 1);
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size = 1 + mach_get_compressed_size(high);
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}
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low = mach_read_compressed(b + size);
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return(ut_dulint_create(high, low));
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}
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/*************************************************************
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Reads a double. It is stored in a little-endian format. */
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UNIV_INLINE
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double
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mach_double_read(
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/*=============*/
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/* out: double read */
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byte* b) /* in: pointer to memory from where to read */
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{
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double d;
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ulint i;
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byte* ptr;
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ptr = (byte*)&d;
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for (i = 0; i < sizeof(double); i++) {
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#ifdef WORDS_BIGENDIAN
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ptr[sizeof(double) - i - 1] = b[i];
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#else
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ptr[i] = b[i];
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#endif
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}
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return(d);
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}
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/*************************************************************
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Writes a double. It is stored in a little-endian format. */
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UNIV_INLINE
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void
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mach_double_write(
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/*==============*/
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byte* b, /* in: pointer to memory where to write */
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double d) /* in: double */
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{
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ulint i;
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byte* ptr;
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ptr = (byte*)&d;
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for (i = 0; i < sizeof(double); i++) {
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#ifdef WORDS_BIGENDIAN
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b[i] = ptr[sizeof(double) - i - 1];
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#else
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b[i] = ptr[i];
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#endif
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}
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}
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/*************************************************************
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Reads a float. It is stored in a little-endian format. */
|
|
UNIV_INLINE
|
|
float
|
|
mach_float_read(
|
|
/*============*/
|
|
/* out: float read */
|
|
byte* b) /* in: pointer to memory from where to read */
|
|
{
|
|
float d;
|
|
ulint i;
|
|
byte* ptr;
|
|
|
|
ptr = (byte*)&d;
|
|
|
|
for (i = 0; i < sizeof(float); i++) {
|
|
#ifdef WORDS_BIGENDIAN
|
|
ptr[sizeof(float) - i - 1] = b[i];
|
|
#else
|
|
ptr[i] = b[i];
|
|
#endif
|
|
}
|
|
|
|
return(d);
|
|
}
|
|
|
|
/*************************************************************
|
|
Writes a float. It is stored in a little-endian format. */
|
|
UNIV_INLINE
|
|
void
|
|
mach_float_write(
|
|
/*=============*/
|
|
byte* b, /* in: pointer to memory where to write */
|
|
float d) /* in: float */
|
|
{
|
|
ulint i;
|
|
byte* ptr;
|
|
|
|
ptr = (byte*)&d;
|
|
|
|
for (i = 0; i < sizeof(float); i++) {
|
|
#ifdef WORDS_BIGENDIAN
|
|
b[i] = ptr[sizeof(float) - i - 1];
|
|
#else
|
|
b[i] = ptr[i];
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*************************************************************
|
|
Reads a ulint stored in the little-endian format. */
|
|
UNIV_INLINE
|
|
ulint
|
|
mach_read_from_n_little_endian(
|
|
/*===========================*/
|
|
/* out: unsigned long int */
|
|
byte* buf, /* in: from where to read */
|
|
ulint buf_size) /* in: from how many bytes to read */
|
|
{
|
|
ulint n = 0;
|
|
byte* ptr;
|
|
|
|
ut_ad(buf_size <= sizeof(ulint));
|
|
ut_ad(buf_size > 0);
|
|
|
|
ptr = buf + buf_size;
|
|
|
|
for (;;) {
|
|
ptr--;
|
|
|
|
n = n << 8;
|
|
|
|
n += (ulint)(*ptr);
|
|
|
|
if (ptr == buf) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return(n);
|
|
}
|
|
|
|
/*************************************************************
|
|
Writes a ulint in the little-endian format. */
|
|
UNIV_INLINE
|
|
void
|
|
mach_write_to_n_little_endian(
|
|
/*==========================*/
|
|
byte* dest, /* in: where to write */
|
|
ulint dest_size, /* in: into how many bytes to write */
|
|
ulint n) /* in: unsigned long int to write */
|
|
{
|
|
byte* end;
|
|
|
|
ut_ad(dest_size <= sizeof(ulint));
|
|
ut_ad(dest_size > 0);
|
|
|
|
end = dest + dest_size;
|
|
|
|
for (;;) {
|
|
*dest = (byte)(n & 0xFF);
|
|
|
|
n = n >> 8;
|
|
|
|
dest++;
|
|
|
|
if (dest == end) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
ut_ad(n == 0);
|
|
}
|
|
|
|
/*************************************************************
|
|
Reads a ulint stored in the little-endian format. */
|
|
UNIV_INLINE
|
|
ulint
|
|
mach_read_from_2_little_endian(
|
|
/*===========================*/
|
|
/* out: unsigned long int */
|
|
byte* buf) /* in: from where to read */
|
|
{
|
|
return((ulint)(*buf) + ((ulint)(*(buf + 1))) * 256);
|
|
}
|
|
|
|
/*************************************************************
|
|
Writes a ulint in the little-endian format. */
|
|
UNIV_INLINE
|
|
void
|
|
mach_write_to_2_little_endian(
|
|
/*==========================*/
|
|
byte* dest, /* in: where to write */
|
|
ulint n) /* in: unsigned long int to write */
|
|
{
|
|
ut_ad(n < 256 * 256);
|
|
|
|
*dest = (byte)(n & 0xFFUL);
|
|
|
|
n = n >> 8;
|
|
dest++;
|
|
|
|
*dest = (byte)(n & 0xFFUL);
|
|
}
|