/* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. This program is free software ; you can redistribute it and / or modify it under the terms of the GNU General Public License as published by the Free Software Foundation ; version 2 of the License . This program is distributed in the hope that it will be useful , but WITHOUT ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License for more details . You should have received a copy of the GNU General Public License along with this program ; if not , write to the Free Software Foundation , #ifndef SQL_DIGEST_H#define SQL_DIGEST_H#include <string.h>class String;#define MAX_DIGEST_STORAGE_SIZE (1024 *1024 )#define DIGEST_HASH_SIZE 16 /** Structure to store token count / array for a statement on which digest is to be calculated . struct sql_digest_storagebool m_full;unsigned char m_hash[DIGEST_HASH_SIZE];/** Character set number. */ /** Token array . Token array is an array of bytes to store tokens received during parsing . Following is the way token array is formed . . . . & lt ; non - id - token & gt ; & lt ; non - id - token & gt ; & lt ; id - token &</span>gt ; & lt ; id_len & gt ; & lt ; id_text & gt ; . . . For Example : SELECT * FROM T1 ; & lt ; SELECT_TOKEN & gt ; & lt ; * & gt ; & lt ; FROM_TOKEN & gt ; &an>lt ; ID_TOKEN & gt ; & lt ; 2 & gt ; & lt ; T1 & gt ; @ note Only the first @ c m_byte_count bytes are initialized , out of @ c m_token_array_length . unsigned char *m_token_array;/* Length of the token array to be considered for DIGEST_TEXT calculation. */ 0 );inline void reset(unsigned char *token_array, size_t length)inline void reset()false ;0 ;0 ;0 , DIGEST_HASH_SIZE);inline bool is_empty()return (m_byte_count == 0 );inline void copy(const sql_digest_storage *from)/* Keep in mind this is a dirty copy of something that may change , as the thread producing the digest is executing concurrently , without any lock enforced . if (byte_count_copy > 0 )else false ;0 ;0 ;typedef struct sql_digest_storage sql_digest_storage;/** Compute a digest hash . @ param digest_storage The digest @ param [ out ] hash The computed digest hash . This parameter is a buffer of size @ c DIGEST_HASH_SIZE . void compute_digest_hash(const sql_digest_storage *digest_storage, unsigned char *hash);/** 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 @ param digest_storage The digest @ param [ out ] digest_text @ param digest_text_length Size of @ c digest_text . @ param [ out ] truncated true if the text representation was truncated void compute_digest_text(const sql_digest_storage *digest_storage,#endif
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