#include "ut0mem.h"

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Functions
UNIV_INLINE void	mach_write_to_1 (byte *b, ulint n)
UNIV_INLINE ulint	mach_read_from_1 (const byte *b)
UNIV_INLINE void	mach_write_to_2 (byte *b, ulint n)
UNIV_INLINE ulint	mach_read_from_2 (const byte *b)
UNIV_INLINE uint16	mach_encode_2 (ulint n)
UNIV_INLINE ulint	mach_decode_2 (uint16 n)
UNIV_INLINE void	mach_write_to_3 (byte *b, ulint n)
UNIV_INLINE ulint	mach_read_from_3 (const byte *b)
UNIV_INLINE void	mach_write_to_4 (byte *b, ulint n)
UNIV_INLINE ulint	mach_read_from_4 (const byte *b)
UNIV_INLINE ulint	mach_write_compressed (byte *b, ulint n)
UNIV_INLINE ulint	mach_get_compressed_size (ulint n)
UNIV_INLINE ulint	mach_read_compressed (const byte *b)
UNIV_INLINE void	mach_write_to_8 (void *b, ib_uint64_t n)
UNIV_INLINE ib_uint64_t	mach_read_from_8 (const byte *b)
UNIV_INLINE void	mach_write_to_7 (byte *b, ib_uint64_t n)
UNIV_INLINE ib_uint64_t	mach_read_from_7 (const byte *b)
UNIV_INLINE void	mach_write_to_6 (byte *b, ib_uint64_t n)
UNIV_INLINE ib_uint64_t	mach_read_from_6 (const byte *b)
UNIV_INLINE ulint	mach_ull_write_compressed (byte *b, ib_uint64_t n)
UNIV_INLINE ulint	mach_ull_get_compressed_size (ib_uint64_t n)
UNIV_INLINE ib_uint64_t	mach_ull_read_compressed (const byte *b)
UNIV_INLINE ulint	mach_ull_write_much_compressed (byte *b, ib_uint64_t n)
UNIV_INLINE ulint	mach_ull_get_much_compressed_size (ib_uint64_t n)
UNIV_INLINE ib_uint64_t	mach_ull_read_much_compressed (const byte *b)
UNIV_INLINE byte *	mach_ull_parse_compressed (byte ptr, byte end_ptr, ib_uint64_t *val)
UNIV_INLINE double	mach_double_read (const byte *b)
UNIV_INLINE void	mach_double_write (byte *b, double d)
UNIV_INLINE float	mach_float_read (const byte *b)
UNIV_INLINE void	mach_float_write (byte *b, float d)
UNIV_INLINE ulint	mach_read_from_n_little_endian (const byte *buf, ulint buf_size)
UNIV_INLINE void	mach_write_to_n_little_endian (byte *dest, ulint dest_size, ulint n)
UNIV_INLINE ulint	mach_read_from_2_little_endian (const byte *buf)
UNIV_INLINE void	mach_write_to_2_little_endian (byte *dest, ulint n)
UNIV_INLINE ib_uint64_t	mach_read_int_type (const byte *src, ulint len, ibool unsigned_type)
UNIV_INLINE void	mach_swap_byte_order (byte dest, const byte from, ulint len)
UNIV_INLINE void	mach_write_int_type (byte dest, const byte src, ulint len, bool usign)
UNIV_INLINE void	mach_write_ulonglong (byte *dest, ulonglong src, ulint len, bool usign)
UNIV_INLINE ulint	mach_read_ulint (const byte *ptr, ulint type)

Detailed Description

Utilities for converting data from the database file to the machine format.

Created 11/28/1995 Heikki Tuuri

Function Documentation

UNIV_INLINE ulint mach_decode_2 ( uint16 n )

The following function is used to convert a 16-bit data item from the canonical format, for fast bytewise equality test against memory.

Returns: integer in machine-dependent format

Parameters

n	in: 16-bit integer in canonical format

UNIV_INLINE double mach_double_read ( const byte * b )

Reads a double. It is stored in a little-endian format.

Returns: double read

Parameters

b	in: pointer to memory from where to read

UNIV_INLINE void mach_double_write	(	byte *	b,
		double	d
	)

Writes a double. It is stored in a little-endian format.

Parameters

b	in: pointer to memory where to write
d	in: double

UNIV_INLINE uint16 mach_encode_2 ( ulint n )

The following function is used to convert a 16-bit data item to the canonical format, for fast bytewise equality test against memory.

Returns: 16-bit integer in canonical format

Parameters

n	in: integer in machine-dependent format

UNIV_INLINE float mach_float_read ( const byte * b )

Reads a float. It is stored in a little-endian format.

Returns: float read

Parameters

b	in: pointer to memory from where to read

UNIV_INLINE void mach_float_write	(	byte *	b,
		float	d
	)

Writes a float. It is stored in a little-endian format.

Parameters

b	in: pointer to memory where to write
d	in: float

UNIV_INLINE ulint mach_get_compressed_size ( ulint n )

Returns the size of a ulint when written in the compressed form.

Returns: compressed size in bytes

Parameters

n	in: ulint integer (< 2^32) to be stored

UNIV_INLINE ulint mach_read_compressed ( const byte * b )

Reads a ulint in a compressed form.

Returns: read integer (< 2^32)

Parameters

b	in: pointer to memory from where to read

UNIV_INLINE ulint mach_read_from_1 ( const byte * b )

The following function is used to fetch data from one byte.

Returns: ulint integer, >= 0, < 256

Parameters

b	in: pointer to byte

UNIV_INLINE ulint mach_read_from_2 ( const byte * b )

The following function is used to fetch data from 2 consecutive bytes. The most significant byte is at the lowest address.

Returns: ulint integer

Parameters

b	in: pointer to 2 bytes

UNIV_INLINE ulint mach_read_from_2_little_endian ( const byte * buf )

Reads a ulint stored in the little-endian format.

Returns: unsigned long int

Parameters

buf	in: from where to read

UNIV_INLINE ulint mach_read_from_3 ( const byte * b )

The following function is used to fetch data from 3 consecutive bytes. The most significant byte is at the lowest address.

Returns: ulint integer

Parameters

b	in: pointer to 3 bytes

UNIV_INLINE ulint mach_read_from_4 ( const byte * b )

The following function is used to fetch data from 4 consecutive bytes. The most significant byte is at the lowest address.

Returns: ulint integer

Parameters

b	in: pointer to four bytes

UNIV_INLINE ib_uint64_t mach_read_from_6 ( const byte * b )

The following function is used to fetch data from 6 consecutive bytes. The most significant byte is at the lowest address.

Returns: 48-bit integer

Parameters

b	in: pointer to 6 bytes

UNIV_INLINE ib_uint64_t mach_read_from_7 ( const byte * b )

The following function is used to fetch data from 7 consecutive bytes. The most significant byte is at the lowest address.

Returns: 56-bit integer

Parameters

b	in: pointer to 7 bytes

UNIV_INLINE ib_uint64_t mach_read_from_8 ( const byte * b )

The following function is used to fetch data from 8 consecutive bytes. The most significant byte is at the lowest address.

Returns: 64-bit integer

Parameters

b	in: pointer to 8 bytes

UNIV_INLINE ulint mach_read_from_n_little_endian	(	const byte *	buf,
		ulint	buf_size
	)

Reads a ulint stored in the little-endian format.

Returns: unsigned long int

Parameters

buf	in: from where to read
buf_size	in: from how many bytes to read

UNIV_INLINE ib_uint64_t mach_read_int_type	(	const byte *	src,
		ulint	len,
		ibool	unsigned_type
	)

Convert integral type from storage byte order (big endian) to host byte order.

Returns: integer value

Parameters

src	in: where to read from
len	in: length of src
unsigned_type	in: signed or unsigned flag

UNIV_INLINE ulint mach_read_ulint	(	const byte *	ptr,
		ulint	type
	)

Reads 1 - 4 bytes from a file page buffered in the buffer pool.

Returns: value read

Parameters

ptr	in: pointer from where to read
type	in: 1,2 or 4 bytes

UNIV_INLINE void mach_swap_byte_order	(	byte *	dest,
		const byte *	from,
		ulint	len
	)

Swap byte ordering.

Parameters

dest	out: where to write
from	in: where to read from
len	in: length of src

UNIV_INLINE ulint mach_ull_get_compressed_size ( ib_uint64_t n )

Returns the size of a 64-bit integer when written in the compressed form.

Returns: compressed size in bytes

Parameters

n	in: 64-bit integer to be stored

UNIV_INLINE ulint mach_ull_get_much_compressed_size ( ib_uint64_t n )

Returns the size of a 64-bit integer when written in the compressed form.

Returns: compressed size in bytes

Parameters

n	in: 64-bit integer to be stored

UNIV_INLINE byte* mach_ull_parse_compressed	(	byte *	ptr,
		byte *	end_ptr,
		ib_uint64_t *	val
	)

Reads a 64-bit integer in a compressed form if the log record fully contains it.

Returns: pointer to end of the stored field, NULL if not complete

Parameters

ptr	in: pointer to buffer from where to read
end_ptr	in: pointer to end of the buffer

UNIV_INLINE ib_uint64_t mach_ull_read_compressed ( const byte * b )

Reads a 64-bit integer in a compressed form.

Returns: the value read

Parameters

b	in: pointer to memory from where to read

UNIV_INLINE ib_uint64_t mach_ull_read_much_compressed ( const byte * b )

Reads a 64-bit integer in a compressed form.

Returns: the value read

Parameters

b	in: pointer to memory from where to read

UNIV_INLINE ulint mach_ull_write_compressed	(	byte *	b,
		ib_uint64_t	n
	)

Writes a 64-bit integer in a compressed form (5..9 bytes).

Returns: size in bytes

Parameters

b	in: pointer to memory where to store
n	in: 64-bit integer to be stored

UNIV_INLINE ulint mach_ull_write_much_compressed	(	byte *	b,
		ib_uint64_t	n
	)

Writes a 64-bit integer in a compressed form (1..11 bytes).

Returns: size in bytes

Parameters

b	in: pointer to memory where to store
n	in: 64-bit integer to be stored

UNIV_INLINE ulint mach_write_compressed	(	byte *	b,
		ulint	n
	)

Writes a ulint in a compressed form where the first byte codes the length of the stored ulint. We look at the most significant bits of the byte. If the most significant bit is zero, it means 1-byte storage, else if the 2nd bit is 0, it means 2-byte storage, else if 3rd is 0, it means 3-byte storage, else if 4th is 0, it means 4-byte storage, else the storage is 5-byte.

Returns: compressed size in bytes

Parameters

b	in: pointer to memory where to store
n	in: ulint integer (< 2^32) to be stored

UNIV_INLINE void mach_write_int_type	(	byte *	dest,
		const byte *	src,
		ulint	len,
		bool	usign
	)

Convert integral type from host byte order to (big-endian) storage byte order. in: signed or unsigned flag

Parameters

dest	in: where to write
src	in: where to read from
len	in: length of src
usign	in: signed or unsigned flag

UNIV_INLINE void mach_write_to_1	(	byte *	b,
		ulint	n
	)

The following function is used to store data in one byte.

Parameters

b	in: pointer to byte where to store
n	in: ulint integer to be stored, >= 0, < 256

UNIV_INLINE void mach_write_to_2	(	byte *	b,
		ulint	n
	)

The following function is used to store data in two consecutive bytes. We store the most significant byte to the lowest address.

Parameters

b	in: pointer to two bytes where to store
n	in: ulint integer to be stored

UNIV_INLINE void mach_write_to_2_little_endian	(	byte *	dest,
		ulint	n
	)

Writes a ulint in the little-endian format.

Parameters

dest	in: where to write
n	in: unsigned long int to write

UNIV_INLINE void mach_write_to_3	(	byte *	b,
		ulint	n
	)

The following function is used to store data in 3 consecutive bytes. We store the most significant byte to the lowest address.

Parameters

b	in: pointer to 3 bytes where to store
n	in: ulint integer to be stored

UNIV_INLINE void mach_write_to_4	(	byte *	b,
		ulint	n
	)

The following function is used to store data in four consecutive bytes. We store the most significant byte to the lowest address.

Parameters

b	in: pointer to four bytes where to store
n	in: ulint integer to be stored

UNIV_INLINE void mach_write_to_6	(	byte *	b,
		ib_uint64_t	n
	)

The following function is used to store data in 6 consecutive bytes. We store the most significant byte to the lowest address.

Parameters

b	in: pointer to 6 bytes where to store
n	in: 48-bit integer

UNIV_INLINE void mach_write_to_7	(	byte *	b,
		ib_uint64_t	n
	)

The following function is used to store data in 7 consecutive bytes. We store the most significant byte to the lowest address.

Parameters

b	in: pointer to 7 bytes where to store
n	in: 56-bit integer

UNIV_INLINE void mach_write_to_8	(	void *	b,
		ib_uint64_t	n
	)

The following function is used to store data in 8 consecutive bytes. We store the most significant byte to the lowest address.

Parameters

b	in: pointer to 8 bytes where to store
n	in: 64-bit integer to be stored

UNIV_INLINE void mach_write_to_n_little_endian	(	byte *	dest,
		ulint	dest_size,
		ulint	n
	)

Writes a ulint in the little-endian format.

Parameters

dest	in: where to write
dest_size	in: into how many bytes to write
n	in: unsigned long int to write

UNIV_INLINE void mach_write_ulonglong	(	byte *	dest,
		ulonglong	src,
		ulint	len,
		bool	usign
	)

in: signed or unsigned flag

Parameters

dest	in: where to write
src	in: where to read from
len	in: length of dest
usign	in: signed or unsigned flag

Functions

Detailed Description

Function Documentation