function readHeader()
{
$this->version = $this->readChar();
$this->foxpro = $this->version == 48 || $this->version == 49 || $this->version == 245 || $this->version == 251;
$this->modifyDate = $this->read3ByteDate();
$this->recordCount = $this->readInt();
$this->headerLength = $this->readShort();
$this->recordByteLength = $this->readShort();
$this->readBytes(2);
//reserved
$this->inTransaction = $this->readByte() != 0;
$this->encrypted = $this->readByte() != 0;
$this->readBytes(4);
//Free record thread
$this->readBytes(8);
//Reserved for multi-user dBASE
$this->mdxFlag = $this->readByte();
$this->languageCode = $this->readByte();
$this->readBytes(2);
//reserved
$fieldCount = ($this->headerLength - ($this->foxpro ? 296 : 33)) / 32;
/* some checking */
if (!$this->isStream && $this->headerLength > filesize($this->name)) {
trigger_error($this->name . " is not DBF", E_USER_ERROR);
}
if (!$this->isStream && $this->headerLength + $this->recordCount * $this->recordByteLength - 500 > filesize($this->name)) {
trigger_error($this->name . " is not DBF", E_USER_ERROR);
}
/* columns */
$this->columnNames = array();
$this->columns = array();
$bytepos = 1;
for ($i = 0; $i < $fieldCount; $i++) {
$column = new XBaseColumn($this->readString(11), $this->readByte(), $this->readInt(), $this->readChar(), $this->readChar(), $this->readBytes(2), $this->readChar(), $this->readBytes(2), $this->readByte() != 0, $this->readBytes(7), $this->readByte() != 0, $i, $bytepos);
$bytepos += $column->getLength();
$this->columnNames[$i] = $column->getName();
$this->columns[$i] = $column;
}
/**/
if ($this->foxpro) {
$this->backlist = $this->readBytes(263);
}
$b = $this->readByte();
$this->recordPos = -1;
$this->record = false;
$this->deleteCount = 0;
}
