mysqlnd_read_buffer.c

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/*
  +----------------------------------------------------------------------+
  | Copyright (c) The PHP Group                                          |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | https://www.php.net/license/3_01.txt                                 |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Authors: Andrey Hristov <andrey@php.net>                             |
  |          Ulf Wendel <uw@php.net>                                     |
  +----------------------------------------------------------------------+
*/
 
#include "php.h"
#include "mysqlnd.h"
#include "mysqlnd_debug.h"
#include "mysqlnd_read_buffer.h"
 
 
/* {{{ mysqlnd_read_buffer_is_empty */
static bool
mysqlnd_read_buffer_is_empty(const MYSQLND_READ_BUFFER * const buffer)
{
    return buffer->len? FALSE:TRUE;
}
/* }}} */
 
 
/* {{{ mysqlnd_read_buffer_read */
static void
mysqlnd_read_buffer_read(MYSQLND_READ_BUFFER * buffer, const size_t count, zend_uchar * dest)
{
    if (buffer->len >= count) {
        memcpy(dest, buffer->data + buffer->offset, count);
        buffer->offset += count;
        buffer->len -= count;
    }
}
/* }}} */
 
 
/* {{{ mysqlnd_read_buffer_bytes_left */
static size_t
mysqlnd_read_buffer_bytes_left(const MYSQLND_READ_BUFFER * const buffer)
{
    return buffer->len;
}
/* }}} */
 
 
/* {{{ mysqlnd_read_buffer_free */
static void
mysqlnd_read_buffer_free(MYSQLND_READ_BUFFER ** buffer)
{
    DBG_ENTER("mysqlnd_read_buffer_free");
    if (*buffer) {
        mnd_efree((*buffer)->data);
        mnd_efree(*buffer);
        *buffer = NULL;
    }
    DBG_VOID_RETURN;
}
/* }}} */
 
 
/* {{{ mysqlnd_create_read_buffer */
PHPAPI MYSQLND_READ_BUFFER *
mysqlnd_create_read_buffer(const size_t count)
{
    MYSQLND_READ_BUFFER * ret = mnd_emalloc(sizeof(MYSQLND_READ_BUFFER));
    DBG_ENTER("mysqlnd_create_read_buffer");
    ret->is_empty = mysqlnd_read_buffer_is_empty;
    ret->read = mysqlnd_read_buffer_read;
    ret->bytes_left = mysqlnd_read_buffer_bytes_left;
    ret->free_buffer = mysqlnd_read_buffer_free;
    ret->data = mnd_emalloc(count);
    ret->size = ret->len = count;
    ret->offset = 0;
    DBG_RETURN(ret);
}
/* }}} */