vendor/topthink/think-image/src/image/gif/Encoder.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2015 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: yunwuxin <448901948@qq.com>
// +----------------------------------------------------------------------
namespace think\image\gif;

class Encoder
{
    public $GIF = "GIF89a"; /* GIF header 6 bytes    */
    public $VER = "GIFEncoder V2.05"; /* Encoder version        */
    public $BUF = [];
    public $LOP = 0;
    public $DIS = 2;
    public $COL = -1;
    public $IMG = -1;
    public $ERR = [
        'ERR00' => "Does not supported function for only one image!",
        'ERR01' => "Source is not a GIF image!",
        'ERR02' => "Unintelligible flag ",
        'ERR03' => "Does not make animation from animated GIF source",
    ];

    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::    GIFEncoder...
    ::
     */
    public function __construct(
        $GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,
        $GIF_red, $GIF_grn, $GIF_blu, $GIF_mod
    )
    {
        if (!is_array($GIF_src)) {
            printf("%s: %s", $this->VER, $this->ERR['ERR00']);
            exit(0);
        }
        $this->LOP = ($GIF_lop > -1) ? $GIF_lop : 0;
        $this->DIS = ($GIF_dis > -1) ? (($GIF_dis < 3) ? $GIF_dis : 3) : 2;
        $this->COL = ($GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1) ?
            ($GIF_red | ($GIF_grn << 8) | ($GIF_blu << 16)) : -1;
        for ($i = 0; $i < count($GIF_src); $i++) {
            if (strtolower($GIF_mod) == "url") {
                $this->BUF[] = fread(fopen($GIF_src[$i], "rb"), filesize($GIF_src[$i]));
            } else if (strtolower($GIF_mod) == "bin") {
                $this->BUF[] = $GIF_src[$i];
            } else {
                printf("%s: %s ( %s )!", $this->VER, $this->ERR['ERR02'], $GIF_mod);
                exit(0);
            }
            if (substr($this->BUF[$i], 0, 6) != "GIF87a" && substr($this->BUF[$i], 0, 6) != "GIF89a") {
                printf("%s: %d %s", $this->VER, $i, $this->ERR['ERR01']);
                exit(0);
            }