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bug #1676033 [core] pow(int,int) causes overflow

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This commit is contained in:
Sebastian Mendel
2007-03-14 12:47:37 +00:00
parent b528a6d646
commit 414aa4fbc2
3 changed files with 67 additions and 11 deletions
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75
libraries/common.lib.php
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@@ -454,6 +454,61 @@ if (!defined('PMA_MINIMUM_COMMON')) {
*/
require_once './libraries/js_escape.lib.php';
/**
* Exponential expression / raise number into power
*
* @uses function_exists()
* @uses bcpow()
* @uses gmp_pow()
* @uses gmp_strval()
* @uses pow()
* @param number $base
* @param number $exp
* @param string pow function use, or false for auto-detect
* @return mixed string or float
*/
function PMA_pow($base, $exp, $use_function = false)
{
static $pow_function = null;
if (null == $pow_function) {
if (function_exists('bcpow')) {
// BCMath Arbitrary Precision Mathematics Function
$pow_function = 'bcpow';
} elseif (function_exists('gmp_pow')) {
// GMP Function
$pow_function = 'gmp_pow';
} else {
// PHP function
$pow_function = 'pow';
}
}
if (! $use_function) {
$use_function = $pow_function;
}
switch ($use_function) {
case 'bcpow' :
$pow = bcpow($base, $exp);
break;
case 'gmp_pow' :
$pow = gmp_strval(gmp_pow($base, $exp));
break;
case 'pow' :
$base = (float) $base;
$exp = (int) $exp;
if ($exp < 0) {
return false;
}
$pow = pow($base, $exp);
break;
default:
$pow = $use_function($base, $exp);
}
return $pow;
}
/**
* string PMA_getIcon(string $icon)
*
@@ -1577,15 +1632,15 @@ if (typeof(window.parent) != 'undefined'
*/
function PMA_formatByteDown($value, $limes = 6, $comma = 0)
{
$dh = pow(10, $comma);
$li = pow(10, $limes);
$dh = PMA_pow(10, $comma);
$li = PMA_pow(10, $limes);
$return_value = $value;
$unit = $GLOBALS['byteUnits'][0];
for ($d = 6, $ex = 15; $d >= 1; $d--, $ex-=3) {
if (isset($GLOBALS['byteUnits'][$d]) && $value >= $li * pow(10, $ex)) {
if (isset($GLOBALS['byteUnits'][$d]) && $value >= $li * PMA_pow(10, $ex)) {
// use 1024.0 to avoid integer overflow on 64-bit machines
$value = round($value / (pow(1024.0, $d) / $dh)) /$dh;
$value = round($value / (PMA_pow(1024, $d) / $dh)) /$dh;
$unit = $GLOBALS['byteUnits'][$d];
break 1;
} // end if
@@ -1668,22 +1723,22 @@ if (typeof(window.parent) != 'undefined'
$sign = '';
}
$dh = pow(10, $comma);
$li = pow(10, $length);
$dh = PMA_pow(10, $comma);
$li = PMA_pow(10, $length);
$unit = $units[0];
if ($value >= 1) {
for ($d = 8; $d >= 0; $d--) {
if (isset($units[$d]) && $value >= $li * pow(1000.0, $d-1)) {
$value = round($value / (pow(1000.0, $d) / $dh)) /$dh;
if (isset($units[$d]) && $value >= $li * PMA_pow(1000, $d-1)) {
$value = round($value / (PMA_pow(1000, $d) / $dh)) /$dh;
$unit = $units[$d];
break 1;
} // end if
} // end for
} elseif (!$only_down && (float) $value !== 0.0) {
for ($d = -8; $d <= 8; $d++) {
if (isset($units[$d]) && $value <= $li * pow(1000.0, $d-1)) {
$value = round($value / (pow(1000.0, $d) / $dh)) /$dh;
if (isset($units[$d]) && $value <= $li * PMA_pow(1000, $d-1)) {
$value = round($value / (PMA_pow(1000, $d) / $dh)) /$dh;
$unit = $units[$d];
break 1;
} // end if