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<?php
/*
+---------------------------------------------------------------------------+
| Revive Adserver |
| http://www.revive-adserver.com |
| |
| Copyright: See the COPYRIGHT.txt file. |
| License: GPLv2 or later, see the LICENSE.txt file. |
+---------------------------------------------------------------------------+
*/
/**
* @package Revive Adserver
*
* A file of memory-related functions, that are used as part of the UI system's
* pre-initialisation "pre-check.php" file, and also as part of the delivery
* engine, maintenance engine, etc.
*/
/**
* Returns the minimum required amount of memory required for operation.
*
* @param strting $limit An optional limitation level, to have a memory limit OTHER than
* the default UI/delivery engine memory limit returned. If used,
* one of:
* - "cache" - The limit used for generating XML caches
* - "plugin" - The limit used for installing pluings
* - "maintenance" - The limit used for the maintenance engine
* @return integer The required minimum amount of memory (in bytes).
*/
function OX_getMinimumRequiredMemory($limit = null)
{
if ($limit == 'maintenance') {
return 134217728; // 128MB in bytes (128 * 1048576)
}
return 134217728; // 128MB in bytes (128 * 1048576)
}
/**
* Get the PHP memory_limit value in bytes.
*
* @return integer The memory_limit value set in PHP, in bytes
* (or -1, if no limit).
*/
function OX_getMemoryLimitSizeInBytes()
{
$phpMemoryLimit = ini_get('memory_limit');
if (empty($phpMemoryLimit) || $phpMemoryLimit == -1) {
// No memory limit
return -1;
}
$aSize = [
'G' => 1073741824,
'M' => 1048576,
'K' => 1024
];
$phpMemoryLimitInBytes = $phpMemoryLimit;
foreach ($aSize as $type => $multiplier) {
$pos = strpos($phpMemoryLimit, $type);
if (!$pos) {
$pos = strpos($phpMemoryLimit, strtolower($type));
}
if ($pos) {
$phpMemoryLimitInBytes = substr($phpMemoryLimit, 0, $pos) * $multiplier;
}
}
return $phpMemoryLimitInBytes;
}
/**
* Test if the memory_limit can be changed.
*
* @return boolean True if the memory_limit can be changed, false otherwise.
*/
function OX_checkMemoryCanBeSet()
{
$phpMemoryLimitInBytes = OX_getMemoryLimitSizeInBytes();
// Unlimited memory, no need to check if it can be set
if ($phpMemoryLimitInBytes == -1) {
return true;
}
OX_increaseMemoryLimit($phpMemoryLimitInBytes + 1);
$newPhpMemoryLimitInBytes = OX_getMemoryLimitSizeInBytes();
$memoryCanBeSet = ($phpMemoryLimitInBytes != $newPhpMemoryLimitInBytes);
// Restore previous limit
@ini_set('memory_limit', $phpMemoryLimitInBytes);
return $memoryCanBeSet;
}
/**
* Increase the PHP memory_limit value to the supplied size, if required.
*
* @param integer $setMemory The memory_limit that should be set (in bytes).
* @return boolean True if the memory_limit was already greater than the value
* supplied, or if the attempt to set a larger memory_limit was
* successful; false otherwise.
*/
function OX_increaseMemoryLimit($setMemory)
{
$phpMemoryLimitInBytes = OX_getMemoryLimitSizeInBytes();
if ($phpMemoryLimitInBytes == -1) {
// Memory is unlimited
return true;
}
return !($setMemory > $phpMemoryLimitInBytes && @ini_set('memory_limit', $setMemory) === false);
}