Файл: sys/classes/gifdecoder.class.php
Строк: 50
<?php
class gifdecoder {
public $GIF_buffer = Array();
public $GIF_arrays = Array();
public $GIF_delays = Array();
public $GIF_offset = Array();
public $GIF_stream = "";
public $GIF_string = "";
public $GIF_bfseek = 0;
public $GIF_screen = Array();
public $GIF_global = Array();
public $GIF_sorted;
public $GIF_colorS;
public $GIF_colorC;
public $GIF_colorF;
function gifdecoder($GIF_pointer) {
$this->GIF_stream = $GIF_pointer;
gifdecoder::GIFGetByte(6); // GIF89a
gifdecoder::GIFGetByte(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 << $this->GIF_colorC;
if ($this->GIF_colorF == 1) {
gifdecoder::GIFGetByte(3 * $this->GIF_colorS);
$this->GIF_global = $this->GIF_buffer;
}
for ($cycle = 1; $cycle;) {
if (gifdecoder::GIFGetByte(1)) {
switch ($this->GIF_buffer [0]) {
case 0x21:
gifdecoder::GIFReadExtensions();
break;
case 0x2C:
gifdecoder::GIFReadDescriptor();
break;
case 0x3B:
$cycle = 0;
break;
}
} else {
$cycle = 0;
}
}
}
function GIFReadExtensions() {
gifdecoder::GIFGetByte(1);
for (;;) {
gifdecoder::GIFGetByte(1);
if (( $u = $this->GIF_buffer [0] ) == 0x00) {
break;
}
gifdecoder::GIFGetByte($u);
if ($u == 4) {
$this->GIF_delays [] = ( $this->GIF_buffer [1] | $this->GIF_buffer [2] << 8 );
}
}
}
function GIFReadDescriptor() {
$GIF_screen = Array();
gifdecoder::GIFGetByte(9);
$GIF_screen = $this->GIF_buffer;
$this->GIF_offset [] = Array(( $this->GIF_buffer [0] | $this->GIF_buffer [1] << 8 ), ( $this->GIF_buffer [2] | $this->GIF_buffer [3] << 8 ));
$GIF_colorF = $this->GIF_buffer [8] & 0x80 ? 1 : 0;
if ($GIF_colorF) {
$GIF_code = $this->GIF_buffer [8] & 0x07;
$GIF_sort = $this->GIF_buffer [8] & 0x20 ? 1 : 0;
} else {
$GIF_code = $this->GIF_colorC;
$GIF_sort = $this->GIF_sorted;
}
$GIF_size = 2 << $GIF_code;
$this->GIF_screen [4] &= 0x70;
$this->GIF_screen [4] |= 0x80;
$this->GIF_screen [4] |= $GIF_code;
if ($GIF_sort) {
$this->GIF_screen [4] |= 0x08;
}
$this->GIF_string = "GIF87a";
gifdecoder::GIFPutByte($this->GIF_screen);
if ($GIF_colorF == 1) {
gifdecoder::GIFGetByte(3 * $GIF_size);
gifdecoder::GIFPutByte($this->GIF_buffer);
} else {
gifdecoder::GIFPutByte($this->GIF_global);
}
$this->GIF_string .= chr(0x2C);
$GIF_screen [8] &= 0x40;
gifdecoder::GIFPutByte($GIF_screen);
gifdecoder::GIFGetByte(1);
gifdecoder::GIFPutByte($this->GIF_buffer);
for (;;) {
gifdecoder::GIFGetByte(1);
gifdecoder::GIFPutByte($this->GIF_buffer);
if (( $u = $this->GIF_buffer [0] ) == 0x00) {
break;
}
gifdecoder::GIFGetByte($u);
gifdecoder::GIFPutByte($this->GIF_buffer);
}
$this->GIF_string .= chr(0x3B);
$this->GIF_arrays [] = $this->GIF_string;
}
function GIFGetByte($len) {
$this->GIF_buffer = Array();
for ($i = 0; $i < $len; $i++) {
if ($this->GIF_bfseek > strlen($this->GIF_stream)) {
return 0;
}
$this->GIF_buffer [] = ord($this->GIF_stream { $this->GIF_bfseek++});
}
return 1;
}
function GIFPutByte($bytes) {
for ($i = 0; $i < count($bytes); $i++) {
$this->GIF_string .= chr($bytes [$i]);
}
}
function GIFGetFrames() {
return ( $this->GIF_arrays );
}
function GIFGetDelays() {
return ( $this->GIF_delays );
}
function GIFGetOffset() {
return ( $this->GIF_offset );
}
}