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/*****************************************************************************
Copyright (C) 1996, 2009, Innobase Oy. 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, Inc., 51 Franklin
St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**************************************************//**
@file include/dyn0dyn.h
The dynamically allocated array
Created 2/5/1996 Heikki Tuuri
*******************************************************/
#pragma once
#ifndef dyn0dyn_h
#define dyn0dyn_h
#include "univ.i"
#include "ut0lst.h"
#include "mem0mem.h"
/** A block in a dynamically allocated array */
typedef struct dyn_block_struct dyn_block_t;
/** Dynamically allocated array */
typedef dyn_block_t dyn_array_t;
/** This is the initial 'payload' size of a dynamic array;
this must be > MLOG_BUF_MARGIN + 30! */
#define DYN_ARRAY_DATA_SIZE 512
/*********************************************************************//**
Initializes a dynamic array.
@return initialized dyn array */
UNIV_INLINE
dyn_array_t*
dyn_array_create(
/*=============*/
dyn_array_t* arr); /*!< in: pointer to a memory buffer of
size sizeof(dyn_array_t) */
/************************************************************//**
Frees a dynamic array. */
UNIV_INLINE
void
dyn_array_free(
/*===========*/
dyn_array_t* arr); /*!< in: dyn array */
/*********************************************************************//**
Makes room on top of a dyn array and returns a pointer to a buffer in it.
After copying the elements, the caller must close the buffer using
dyn_array_close.
@return pointer to the buffer */
UNIV_INLINE
byte*
dyn_array_open(
/*===========*/
dyn_array_t* arr, /*!< in: dynamic array */
ulint size); /*!< in: size in bytes of the buffer; MUST be
smaller than DYN_ARRAY_DATA_SIZE! */
/*********************************************************************//**
Closes the buffer returned by dyn_array_open. */
UNIV_INLINE
void
dyn_array_close(
/*============*/
dyn_array_t* arr, /*!< in: dynamic array */
byte* ptr); /*!< in: buffer space from ptr up was not used */
/*********************************************************************//**
Makes room on top of a dyn array and returns a pointer to
the added element. The caller must copy the element to
the pointer returned.
@return pointer to the element */
UNIV_INLINE
void*
dyn_array_push(
/*===========*/
dyn_array_t* arr, /*!< in: dynamic array */
ulint size); /*!< in: size in bytes of the element */
/************************************************************//**
Returns pointer to an element in dyn array.
@return pointer to element */
UNIV_INLINE
void*
dyn_array_get_element(
/*==================*/
dyn_array_t* arr, /*!< in: dyn array */
ulint pos); /*!< in: position of element as bytes
from array start */
/************************************************************//**
Returns the size of stored data in a dyn array.
@return data size in bytes */
UNIV_INLINE
ulint
dyn_array_get_data_size(
/*====================*/
dyn_array_t* arr); /*!< in: dyn array */
/************************************************************//**
Gets the first block in a dyn array. */
UNIV_INLINE
dyn_block_t*
dyn_array_get_first_block(
/*======================*/
dyn_array_t* arr); /*!< in: dyn array */
/************************************************************//**
Gets the last block in a dyn array. */
UNIV_INLINE
dyn_block_t*
dyn_array_get_last_block(
/*=====================*/
dyn_array_t* arr); /*!< in: dyn array */
/********************************************************************//**
Gets the next block in a dyn array.
@return pointer to next, NULL if end of list */
UNIV_INLINE
dyn_block_t*
dyn_array_get_next_block(
/*=====================*/
dyn_array_t* arr, /*!< in: dyn array */
dyn_block_t* block); /*!< in: dyn array block */
/********************************************************************//**
Gets the number of used bytes in a dyn array block.
@return number of bytes used */
UNIV_INLINE
ulint
dyn_block_get_used(
/*===============*/
dyn_block_t* block); /*!< in: dyn array block */
/********************************************************************//**
Gets pointer to the start of data in a dyn array block.
@return pointer to data */
UNIV_INLINE
byte*
dyn_block_get_data(
/*===============*/
dyn_block_t* block); /*!< in: dyn array block */
/********************************************************//**
Pushes n bytes to a dyn array. */
UNIV_INLINE
void
dyn_push_string(
/*============*/
dyn_array_t* arr, /*!< in: dyn array */
const byte* str, /*!< in: string to write */
ulint len); /*!< in: string length */
/*#################################################################*/
/** @brief A block in a dynamically allocated array.
NOTE! Do not access the fields of the struct directly: the definition
appears here only for the compiler to know its size! */
struct dyn_block_struct{
mem_heap_t* heap; /*!< in the first block this is != NULL
if dynamic allocation has been needed */
ulint used; /*!< number of data bytes used in this block;
DYN_BLOCK_FULL_FLAG is set when the block
becomes full */
byte data[DYN_ARRAY_DATA_SIZE];
/*!< storage for array elements */
UT_LIST_BASE_NODE_T(dyn_block_t) base;
/*!< linear list of dyn blocks: this node is
used only in the first block */
UT_LIST_NODE_T(dyn_block_t) list;
/*!< linear list node: used in all blocks */
#ifdef UNIV_DEBUG
ulint buf_end;/*!< only in the debug version: if dyn
array is opened, this is the buffer
end offset, else this is 0 */
ulint magic_n;/*!< magic number (DYN_BLOCK_MAGIC_N) */
#endif
};
#ifndef UNIV_NONINL
#include "dyn0dyn.ic"
#endif
#endif
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