vendor/topthink/think-image/src/image/gif/Decoder.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 Decoder
{
    public $GIF_buffer = [];
    public $GIF_arrays = [];
    public $GIF_delays = [];
    public $GIF_stream = "";
    public $GIF_string = "";
    public $GIF_bfseek = 0;
    public $GIF_screen = [];
    public $GIF_global = [];
    public $GIF_sorted;
    public $GIF_colorS;
    public $GIF_colorC;
    public $GIF_colorF;

    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::    GIFDecoder ( $GIF_pointer )
    ::
     */
    public function __construct($GIF_pointer)
    {
        $this->GIF_stream = $GIF_pointer;
        $this->getByte(6); // GIF89a
        $this->getByte(7); // Logical Screen Descriptor
        $this->GIF_screen = $this->GIF_buffer;
        $this->GIF_colorF = $this->GIF_buffer[4] & 0x80 ? 1 : 0;
        $this->GIF_sorted = $this->GIF_buffer[4] & 0x08 ? 1 : 0;
        $this->GIF_colorC = $this->GIF_buffer[4] & 0x07;
        $this->GIF_colorS = 2 << $this->GIF_colorC;
        if (1 == $this->GIF_colorF) {
            $this->getByte(3 * $this->GIF_colorS);
            $this->GIF_global = $this->GIF_buffer;
        }

        for ($cycle = 1; $cycle;) {
            if ($this->getByte(1)) {
                switch ($this->GIF_buffer[0]) {
                    case 0x21:
                        $this->readExtensions();
                        break;
                    case 0x2C:
                        $this->readDescriptor();
                        break;
                    case 0x3B:
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