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File: example09.php

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  Classes of zandor  >  CFile  >  example09.php  >  Download  
File: example09.php
Role: Example script
Content type: text/plain
Description: reading some fields in the GIF header
Class: CFile
Read and write values to binary files
Author: By
Last change:
Date: 3 years ago
Size: 3,666 bytes
 

Contents

Class file image Download
<?php // example 01 : simple open and close
     
require_once( "cfile.class.php" );
     
      echo
"<b>EXAMPLE 09</b>: we read some fields in the GIF header<br><br>" ;
     
$CANDIDATEfile = "flowers.gif" ;
     
     
$cfile = new cfile( $CANDIDATEfile, CFILE_LITTLE_ENDIAN );
     
$bOPEN = $cfile->open( CFILE_READ_MODE );
     
$bERR = $cfile->is_error() ;
     
      if (
$bOPEN && !$bERR ) // you can check open return value or internal error for safe operation
     
{
           echo
"OPEN FILE <b>$CANDIDATEfile</b> : SUCCESS<br>" ;
          
           echo
"FILE SIZE : ".( filesize( $CANDIDATEfile ) )." bytes <br>" ;
          
          
$bBEGIN = $cfile->move_to_beginning();
           echo (
$bBEGIN ) ? "OK MOVE TO BEGINNING ...<br>" : "CAN'T MOVE TO THE BEGINNING ...<br>" ;
          
          
$nbytes = 6 ; // GIF MARKER
          
$READ = $cfile->read( $nbytes, CFILE_TEXT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "GIF MARKER:<b>$READ</b><br>" ;

          
$nbytes = 2 ; // IMAGE WIDTH
          
$READ = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "WIDTH:<b>$READ</b><br>" ;
          
          
$nbytes = 2 ; // IMAGE HEIGHT
          
$READ = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "HEIGHT:<b>$READ</b><br>" ;

          
$nbytes = 1 ; // BIT MAPPED
          
$READ = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;

          
$COLOR_INDEX_BK = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
          
$RESERVED = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
          
          
$BITS_PER_PIXEL = $READ & 7 ;
          
               
$COLORS = pow( 2, $BITS_PER_PIXEL + 1 );
               
$nbytes = 1 ;
               
$COLONNE = 16 ;
          
                echo
"<br>
                      <table cellpadding=0 cellspacing=0 valign=\"top\">
                      <tr><td HEIGHT=\"1\"></td></tr>
                      <tr><td COLSPAN=\""
.( $COLONNE * 2 )."\">PALETTE - $COLORS colors</td></tr>" ;
          
          
$nbytes = 1 ; // READ PALETTE
          
for( $clr_count = 0 ; $clr_count < $COLORS ; $clr_count++ )
           {
              
$PALETTE_RED = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN ) ;
              
$PALETTE_GREEN = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN ) ;
              
$PALETTE_BLUE = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN ) ;

                   
$BK = "rgb( $PALETTE_RED, $PALETTE_GREEN, $PALETTE_BLUE )" ;
                   
                   
$PALETTEarray[$i] = array( $PALETTE_RED, $PALETTE_GREEN, $PALETTE_BLUE );
                   
                    if (
$clr_count % $COLONNE == 0 ) echo "<tr>" ;
                   
                    echo
"<td WIDTH=\"14\" HEIGHT=\"14\" STYLE=\"background-color:$BK\"></td>
                          <td WIDTH=\"1\"></td>"
;
                             
                    if (
$clr_count % $COLONNE == ( $COLONNE - 1 ) )
                    echo
"</tr>
                          <tr><td HEIGHT=\"1\"></td></tr>"
;
           }

                echo
"</table>" ;

           echo
"<br>" ;
           echo (
$cfile->close() ) ? "CLOSE FILE <b>$CANDIDATEfile</b> : SUCCESS" : $cfile->get_error_string() ;
      }
      else echo
$cfile->get_error_string() ;
?>