javascript to generate crc code for thumbnails.

forumReader · 2010-03-21 03:31

Found the error: (by reading in the xbmc:wiki)
the thumbnail is often generated by the folder name (if you use folder.jpg).
but in some cases the thumbnail is extra created for files to.

Nick8888 · 2010-11-15 16:25

PHP Version - http://forum.xbmc.org/showthread.php?tid=85445

baderj · 2012-02-27 12:49

forumReader Wrote:123456789 returns 376e6e7
should return:
0376e6e7

The function

Code:

CRC.toString(16);

doesn't do padding with leading zeros.

Here's the revised Code:

Code:

Number.prototype.unsign = function(bytes) {

    return this >= 0 ? this : Math.pow(256, bytes || 4) + this;

};

function FindCRC(data) {

    var CRC = 0xffffffff;

    data = data.toLowerCase();

    for ( var j = 0; j < data.length; j++) {

        var c = data.charCodeAt(j);

        CRC ^= c << 24;

        for ( var i = 0; i < 8; i++) {

            if (CRC.unsign(8) & 0x80000000) {

                CRC = (CRC << 1) ^ 0x04C11DB7;

            } else {

                CRC <<= 1;

            }

        }

    }

    if (CRC < 0)

        CRC = CRC >>> 0;

    var CRC_str = CRC.toString(16);

    while (CRC_str.length < 8) {

        CRC_str = '0' + CRC_str;

    }

    return CRC_str;

}

forumReader Junior Member Posts: 3 Joined: Mar 2010 Reputation: 0	2010-03-21 03:31 Post: #11 Found the error: (by reading in the xbmc:wiki) the thumbnail is often generated by the folder name (if you use folder.jpg). but in some cases the thumbnail is extra created for files to.
	find quote

Nick8888 Fan Posts: 716 Joined: Jan 2007 Reputation: 0	2010-11-15 16:25 Post: #12 PHP Version - http://forum.xbmc.org/showthread.php?tid=85445
	find quote