Файл: sys/inc/gifdecoder.php
Строк: 90
<?php
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFDecoder Version 2.0 by László Zsidi, http://gifs.hu
::
:: Created at 2007. 02. 01. '07.47.AM'
::
::
::
::
:: Try on-line GIFBuilder Form demo based on GIFDecoder.
::
:: http://phpclasses.gifs.hu/demos/GifBuilder/
::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
*/
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;
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFDecoder ( $GIF_pointer )
::
*/
public function GIFDecoder($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;
}
/*
*
* 05.06.2007.
* Made a little modification
*
*
- 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 {
+ $cycle = 0;
+ }
- }
*/
for ($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 {
$cycle = 0;
}
}
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFReadExtension ( )
::
*/
public function GIFReadExtensions()
{
GIFDecoder::GIFGetByte(1);
for (; ;) {
GIFDecoder::GIFGetByte(1);
if (($u = $this->GIF_buffer [ 0 ]) == 0x00) {
break;
}
GIFDecoder::GIFGetByte($u);
/*
* 07.05.2007.
* Implemented a new line for a new function
* to determine the originaly delays between
* frames.
*
*/
if ($u == 4) {
$this->GIF_delays [ ] = ($this->GIF_buffer [ 1 ] | $this->GIF_buffer [ 2 ] << 8);
}
}
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFReadExtension ( )
::
*/
public function GIFReadDescriptor()
{
$GIF_screen = array( );
GIFDecoder::GIFGetByte(9);
$GIF_screen = $this->GIF_buffer;
/*
* 11.19.2007.
* Implemented a new line for a new function
* to determine the originaly XY offsets between
* frames.
*
*/
$this->GIF_offset [ ] = array( ($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);
/*
*
* Add frames into $GIF_stream array...
*
*/
$this->GIF_arrays [ ] = $this->GIF_string;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFGetByte ( $len )
::
*/
/*
*
* 05.06.2007.
* Made a little modification
*
*
- 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 { $this->GIF_bfseek++ } );
- }
+ return 1;
- }
*/
public function GIFGetByte($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;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFPutByte ( $bytes )
::
*/
public function GIFPutByte($bytes)
{
for ($i = 0; $i < count($bytes); $i++) {
$this->GIF_string .= chr($bytes [ $i ]);
}
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: PUBLIC FUNCTIONS
::
::
:: GIFGetFrames ( )
::
*/
public function GIFGetFrames()
{
return ($this->GIF_arrays);
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFGetDelays ( )
::
*/
public function GIFGetDelays()
{
return ($this->GIF_delays);
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFGetOffset ( )
::
*/
public function GIFGetOffset()
{
return ($this->GIF_offset);
}
}