sql_digest.h File Reference

#include <string.h>
#include <sys/types.h>
#include "my_inttypes.h"

Go to the source code of this file.

Classes
struct	sql_digest_storage
	Structure to store token count/array for a statement on which digest is to be calculated. More...

Macros
#define	MAX_DIGEST_STORAGE_SIZE   (1024 * 1024)
#define	DIGEST_HASH_TO_STRING(_hash, _str)
	Write SHA-256 hash value in a string to be used as DIGEST for the statement. More...
#define	DIGEST_HASH_TO_STRING_LENGTH   64
	SHA-256 = 32 bytes of binary = 64 printable characters. More...
#define	DIGEST_HASH_SIZE   32
	DIGEST hash size, in bytes. More...

Typedefs
typedef struct sql_digest_storage	sql_digest_storage

Functions
ulong	get_max_digest_length ()
void	compute_digest_hash (const sql_digest_storage *digest_storage, unsigned char *hash)
	Compute a digest hash. More...
void	compute_digest_text (const sql_digest_storage *digest_storage, String *digest_text)
	Compute a digest text. More...

Macro Definition Documentation

DIGEST_HASH_SIZE

#define DIGEST_HASH_SIZE   32

DIGEST hash size, in bytes.

256 bits, for SHA256.

DIGEST_HASH_TO_STRING

#define DIGEST_HASH_TO_STRING	(		_hash,
			_str
	)

Value:

  (void)sprintf(_str,                                                         \
                "%02x%02x%02x%02x%02x%02x%02x%02x"                            \
                "%02x%02x%02x%02x%02x%02x%02x%02x"                            \
                "%02x%02x%02x%02x%02x%02x%02x%02x"                            \
                "%02x%02x%02x%02x%02x%02x%02x%02x",                           \
                _hash[0], _hash[1], _hash[2], _hash[3], _hash[4], _hash[5],   \
                _hash[6], _hash[7], _hash[8], _hash[9], _hash[10], _hash[11], \
                _hash[12], _hash[13], _hash[14], _hash[15], _hash[16],        \
                _hash[17], _hash[18], _hash[19], _hash[20], _hash[21],        \
                _hash[22], _hash[23], _hash[24], _hash[25], _hash[26],        \
                _hash[27], _hash[28], _hash[29], _hash[30], _hash[31])

Write SHA-256 hash value in a string to be used as DIGEST for the statement.

DIGEST_HASH_TO_STRING_LENGTH

#define DIGEST_HASH_TO_STRING_LENGTH   64

SHA-256 = 32 bytes of binary = 64 printable characters.

MAX_DIGEST_STORAGE_SIZE

#define MAX_DIGEST_STORAGE_SIZE   (1024 * 1024)

Typedef Documentation

sql_digest_storage

typedef struct sql_digest_storage sql_digest_storage

Function Documentation

compute_digest_hash()

void compute_digest_hash	(	const sql_digest_storage *	digest_storage,
		unsigned char *	hash
	)

Compute a digest hash.

Parameters

	digest_storage	The digest
[out]	hash	The computed digest hash. This parameter is a buffer of size DIGEST_HASH_SIZE.

compute_digest_text()

void compute_digest_text	(	const sql_digest_storage *	digest_storage,
		String *	digest_text
	)

Compute a digest text.

A 'digest text' is a textual representation of a query, where:

• comments are removed,
• non significant spaces are removed,
• literal values are replaced with a special '?' marker,
• lists of values are collapsed using a shorter notation

  Parameters

  	digest_storage	The digest
  [out]	digest_text	The digest text

get_max_digest_length()

ulong get_max_digest_length

(

)