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/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* phpMyAdmin's BigInts library
*/
/**
* @var BigInts object to handle big integers (in string)
* as JS can handle upto 53 bits of precision only.
*/
var BigInts = {
/**
* Compares two integer strings
*
* @param int1 the string representation of 1st integer
* @param int2 the string representation of 2nd integer
*
* @return int 0 if equal, < 0 if int1 < int2, else > 0
*/
compare: function(int1, int2) {
// trim integers
int1 = int1.trim();
int2 = int2.trim();
// length of integer strings
var len1 = int1.length;
var len2 = int2.length;
// integer is -ve or not
var isNeg1 = (int1[0] === '-');
var isNeg2 = (int2[0] === '-');
// Sign of int1 != int2 then no actual comparison
// is needed we can return result directly
if (isNeg1 !== isNeg2) {
return (isNeg1 === true ? -1 : 1);
}
// replace - sign with 0
int1[0] = isNeg1 ? '0' : int1[0];
int2[0] = isNeg2 ? '0' : int2[0];
// pad integers with 0 to make them
// equal length
int1 = BigInts.lpad(int1, len2);
int2 = BigInts.lpad(int2, len1);
// Now they are good to compare as strings
if (int1 !== int2) {
return (int1 < int2 ? -1 : 1);
}
return 0;
},
/**
* Adds leading zeros to a integer given a total length
*
* @param int the string representation of the integer
* @param total the total length required
*
* @return int the integer of length given with added leading
* zeros if necessary
*/
lpad: function(int, total){
var len = int.length;
var pad = '';
while(len < total) {
pad += '0';
len++;
}
return (pad + int);
}
};
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