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function dbf_class()

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Subject:function dbf_class()
Summary:Error procesing and messages, VisualFoxpro memo fields process
Messages:1
Author:Uldis Nelsons
Date:2011-09-15 13:34:25
 

  1. function dbf_class()   Reply   Report abuse  
Picture of Uldis Nelsons
Uldis Nelsons
2011-09-15 13:34:25
function dbf_class($filename) {
$this->sError = '';
if ( !file_exists($filename)) {
$this->sError = 'Not exist DBF file: ' . $filename . '!!!';
return False;
}
$tail=substr($filename,-4);
if (strcasecmp($tail, '.dbf')!=0) {
$this->sError = 'Invalid extension for DBF file ' . $filename . '!!!';
return False;
}

//Read the File
$handle = fopen($filename, "r");
if (!$handle) {
$this->sError = 'Cannot read DBF file ' . $filename . '!!!';
return False;

}
$filesize = filesize($filename);
echo '$filesize:'.$filesize.PHP_EOL;
$this->_raw = fread ($handle, $filesize);
fclose ($handle);

if ($this->_raw === FALSE) {
$this->sError = 'if ($this->_raw === FALSE) !!!';
return False;
}
//Make sure that we indeed have a dbf file...
if(!isset($this->_raw[0]) ) {
$this->sError = 'if(!isset($this->_raw[0]) ) !!!';
return False;
}

if( !isset($this->_raw[$filesize-1])) {
$this->sError = 'if( !isset($this->_raw[$filesize])) !!!';
return False;
}

if(!(
ord($this->_raw[0]) == 3 || //FoxBASE+/Dbase III plus, no memo
ord($this->_raw[0]) == 131 || //FoxBASE+/dBASE III PLUS, with memo
ord($this->_raw[0]) == 48) //Visual FoxPro
) {
$this->sError = 'Not a valid DBF file !!!';
return False;
}
// 3= file without DBT memo file; 131 ($83)= file with a DBT.
$arrHeaderHex = array();
for($i=0; $i<32; $i++){
$arrHeaderHex[$i] = str_pad(dechex(ord($this->_raw[$i]) ), 2, "0", STR_PAD_LEFT);
}
//Initial information
$line = 32;//Header Size
//Number of records
$this->dbf_num_rec= hexdec($arrHeaderHex[7].$arrHeaderHex[6].$arrHeaderHex[5].$arrHeaderHex[4]);
$this->_hdrsize= hexdec($arrHeaderHex[9].$arrHeaderHex[8]);//Header Size+Field Descriptor
//Number of fields
$this->_rowsize = hexdec($arrHeaderHex[11].$arrHeaderHex[10]);
$this->dbf_num_field = floor(($this->_hdrsize - $line ) / $line ) ;//Number of Fields

//Field properties retrieval looping
for($j=0; $j<$this->dbf_num_field; $j++){
$name = '';
$beg = $j*$line+$line;
for($k=$beg; $k<$beg+11; $k++){
if(ord($this->_raw[$k])!=0){
$name .= $this->_raw[$k];
}
}
$this->dbf_names[$j]['name']= $name;//Name of the Field
$this->dbf_names[$j]['len']= ord($this->_raw[$beg+16]);//Length of the field
$this->dbf_names[$j]['type']= $this->_raw[$beg+11];
}

/**
* momo file
*/
$memoname = '';

/**
* FoxBASE+/dBASE III PLUS, with memo
*/
if (ord($this->_raw[0]) == 131) {
//create filename
$tail = substr($tail, -1, 1); //Get the last character...
if ($tail == 'F') { //See if upper or lower case
$tail = 'T'; //Keep the case the same
} else {
$tail = 't';
}
$memoname = substr($filename, 0, strlen($filename) - 1) . $tail;
}

/**
* Visual FoxPro with memo
*/
elseif (ord($this->_raw[28]) & 2) {
$tail = substr($tail, -1, 1);
if ($tail == 'F') { //See if upper or lower case
$tail = 'FPT'; //Keep the case the same
} else {
$tail = 'fpt';
}
$memoname = substr($filename, 0, strlen($filename) - 3) . $tail;
}

/**
* read memo file im memmory
*/
if (!empty($memoname)) {

$handle = fopen($memoname, "r");
if (!$handle) {
echo "Cannot read DBT file";
exit;
}
$filesize = filesize($memoname);
$this->_memos = fread($handle, $filesize);
fclose($handle);
}
}