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File: example08.php

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  Classes of zandor  >  CFile  >  example08.php  >  Download  
File: example08.php
Role: Example script
Content type: text/plain
Description: reading some fields in the PNG header
Class: CFile
Read and write values to binary files
Author: By
Last change:
Date: 3 years ago
Size: 6,729 bytes
 

Contents

Class file image Download
<?php // example 01 : simple open and close
     
require_once( "cfile.class.php" );
     
      echo
"<b>EXAMPLE 08</b>: we read some fields in the PNG header<br><br>" ;
     
$CANDIDATEfile = "flowers.indexed.png" ;
     
     
$cfile = new cfile( $CANDIDATEfile );
     
$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 = 1 ; // SKIP
          
$READ = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "FIRST BYTE (SKIP):<b>$READ</b><br>" ;
          
          
$nbytes = 3 ; // PNG MARKER
          
$READ = $cfile->read( $nbytes, CFILE_TEXT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "PNG MARKER:<b>$READ</b><br>" ;
          
          
// SKIP DOS CONFIGURATION BYTES
          
$cfile->move( $cfile->get_pointer_position(), 4 );

          
$nbytes = 4 ; // CHUNK LENGTH
          
$CHUNK_DATA_LENGTH = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
           echo (
$CHUNK_DATA_LENGTH === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "CHUNK LENGTH:<b>$CHUNK_DATA_LENGTH</b> bytes<br>" ;

          
$nbytes = 4 ; // CHUNK MARKER
          
$READ = $cfile->read( $nbytes, CFILE_TEXT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "CHUNK MARKER:<b>$READ</b><br>" ;
          
           if (
$READ == "IHDR" )
           {
              
// WIDTH
              
$IMAGE_W = $cfile->read( 4, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
               echo (
$IMAGE_W === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "WIDTH:<b>$IMAGE_W</b><br>" ;

              
// HEIGHT
              
$IMAGE_H = $cfile->read( 4, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
               echo (
$IMAGE_H === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "HEIGHT:<b>$IMAGE_H</b><br>" ;

              
// BIT DEPTH
              
$BIT_DEPTH = $cfile->read( 1, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
               echo (
$BIT_DEPTH === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "BIT DEPTH:<b>$BIT_DEPTH</b><br>" ;

              
// COLOR_TYPE
              
$COLOR_TYPE = $cfile->read( 1, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;

               switch(
$COLOR_TYPE )
               {
                    case
0: $COLOR_TYPE = "Grayscale" ; break ;
                    case
2: $COLOR_TYPE = "RGB" ; break ;
                    case
3: $COLOR_TYPE = "Indexed" ; break ;
                    case
4: $COLOR_TYPE = "Grayscale" ; break ;
                    case
6: $COLOR_TYPE = "RGB" ; break ;
               }
              
               echo (
$COLOR_TYPE === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "COLOR_TYPE:<b>$COLOR_TYPE</b><br>" ;

              
// COMPRESSION
              
$COMPRESSION = $cfile->read( 1, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
               echo (
$COMPRESSION === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "COMPRESSION:<b>$COMPRESSION</b><br>" ;

              
// FILTER
              
$FILTER = $cfile->read( 1, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
               echo (
$FILTER === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "FILTER:<b>$FILTER</b><br>" ;

              
// INTERLACE
              
$INTERLACE = $cfile->read( 1, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
               echo (
$INTERLACE === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "INTERLACE:<b>$INTERLACE</b><br>" ;
           }

          
$cfile->move( $cfile->get_pointer_position(), 4 ); // move to chunk end
          
          
$nbytes = 4 ; // CHUNK LENGTH
          
$CHUNK_DATA_LENGTH = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE, CFILE_BIG_ENDIAN, false ) ;
           echo (
$CHUNK_DATA_LENGTH === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "CHUNK LENGTH:<b>$CHUNK_DATA_LENGTH</b> bytes<br>" ;

          
$nbytes = 4 ; // CHUNK MARKER
          
$READ = $cfile->read( $nbytes, CFILE_TEXT_MODE ) ;
           echo (
$READ === false ) ? "CAN'T READ from file ... <b>".$cfile->get_error_string()."</b><br>" : "CHUNK MARKER:<b>$READ</b><br>" ;

           if (
$READ == "PLTE" )
           {
               
$CLRScount = 256 ; $COLONNE = 16 ; $nbytes = 1 ;
               
                echo
"<br>
                      <table cellpadding=0 cellspacing=0 valign=\"top\" ALIGN=\"left\">
                      <tr><td HEIGHT=\"1\"></td></tr>
                      <tr><td COLSPAN=\""
.( $COLONNE * 2 )."\">PALETTE</td></tr>" ;
                     
                for(
$i = 0 ; $i < $CLRScount ; $i++ )
                {
                   
$PALETTE_RED = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
                   
$PALETTE_GREEN = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
                   
$PALETTE_BLUE = $cfile->read( $nbytes, CFILE_BINARY_INT_MODE ) ;
                   
                   
$BK = "rgb( $PALETTE_RED, $PALETTE_GREEN, $PALETTE_BLUE )" ;
                   
                    if (
$i % $COLONNE == 0 ) echo "<tr>" ;
                   
                    echo
"<td WIDTH=\"14\" HEIGHT=\"14\" STYLE=\"background-color:$BK\"></td>
                          <td WIDTH=\"1\"></td>"
;
                             
                    if (
$i % $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() ;
?>