Web Development

• Replace eval with print on the line that starts eval(T7FC56270E7A70FA81A5935B72EACBE29("...
• Remove the statement if (count($TA5F3C6A11B03839D46AF9FB43C97C188)) exit; from the function.

$TFF44570ACA8241914870AFBC310CDB85 = __FILE__;    
$TFF44570ACA8241914870AFBC310CDB85 = file_get_contents($TFF44570ACA8241914870AFBC310CDB85);    
$TA5F3C6A11B03839D46AF9FB43C97C188 = 0;    
preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $TFF44570ACA8241914870AFBC310CDB85, $TA5F3C6A11B03839D46AF9FB43C97C188);

• Find + replace helps to simplify the variable names so you can see what you're doing;
• Variables have to be declared first, and can't change type part-way through. The only one which seemed to change type was related to the regexp match on the current file contents, which I simply removed;
• You can't write to a string as if it's an array, so I had to replace one of the variables with a List<char>;
• You can't poke characters into a List<T> outside of the current range, so I had to add some code to populate the list with spaces when that happened;
• Some of the code tries to read characters from out-of-bounds indexes, so I had to add some code to return a space when than happened;
• base64_decode(x) ⇒ System.Text.Encoding.Default.GetString(Convert.FromBase64String(x));
• ord(x) ⇒ Microsoft.VisualBasic.Strings.Asc(x);
• String concatenation uses + instead of .;

static void Main()
{
    const string input = @"...";
    // This should be the long string from the "eval(T7FC56270E7A70FA81A5935B72EACBE29(" line of your original post.
    
    Console.WriteLine(Decode(input));
}

static string Decode(string input)
{
    input = base64_decode(input);    
    
    int a = 0;
    int b = 0;
    int c = 0;
    int d = (ord(input[1]) << 8) + ord(input[2]);
    int e = 3;
    int f = 0;
    int g = 16;
    int length = input.Length;
    var result = new List<char>(length << 2);
    
    /*
    $TFF44570ACA8241914870AFBC310CDB85 = __FILE__;
    $TFF44570ACA8241914870AFBC310CDB85 = file_get_contents($TFF44570ACA8241914870AFBC310CDB85);
    $TA5F3C6A11B03839D46AF9FB43C97C188 = 0;
    preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $TFF44570ACA8241914870AFBC310CDB85, $TA5F3C6A11B03839D46AF9FB43C97C188);
    */
    
    for (; e < length; )
    {
        // if (count($TA5F3C6A11B03839D46AF9FB43C97C188)) exit;
        
        if (g == 0)
        {
            d = (ord(input[e++]) << 8);
            d += ord(input[e++]);
            g = 16;
        }
        if ((d & 0x8000) != 0)
        {
            a = (ord(input[e++]) << 4);
            a += (ord(input[e]) >> 4);
            if (a != 0)
            {
                b = (ord(input[e++]) & 0x0F) + 3;
                for (c = 0; c < b; c++)
                    Set(result, f+c, Get(result, f-a+c));
                
                f += b;
            }
            else
            {
                b = (ord(input[e++]) << 8);
                b += ord(input[e++]) + 16;
                
                for (c = 0; c < b; Set(result, f+c++, input[e]));
                
                e++;
                f += b;
            }
        }
        else 
            Set(result, f++, input[e++]);
        
        d <<= 1;
        g--;
        
        if (e == length)
        {
            return new string(result.ToArray());
        }
    }
    
    // Needed because the compiler doesn't think the loop ever exits:
    return null;
}

static string base64_decode(string value)
{
    return System.Text.Encoding.Default.GetString(Convert.FromBase64String(value));
}

static int ord(char c)
{
    return Microsoft.VisualBasic.Strings.Asc(c);
}

static T Get<T>(IList<T> list, int index)
{
    if (index < 0 || index >= list.Count) return default(T);
    return list[index];
}

static void Set<T>(IList<T> list, int index, T value)
{
    while (list.Count <= index) list.Add(default(T));
    list[index] = value;
}

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