Read 328 times |
Created 2014-05-20 17:10:07 |
Updated 2014-05-21 07:53:55 |
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<?php
/*********************************
FILENAME : doctotxt.class.php
PURPOSE : Convert document to text
WRITE DATE : 2014-05-21
**********************************/
class DocxConversion{
private $filename;
public function __construct($filePath) {
$this->filename = $filePath;
}
/************************ doc file ************************************/
private function read_doc() {
$fileHandle = fopen($this->filename, "r");
$line = @fread($fileHandle, filesize($this->filename));
$lines = explode(chr(0x0D),$line);
$outtext = "";
foreach($lines as $thisline)
{
$pos = strpos($thisline, chr(0x00));
if (($pos !== FALSE)||(strlen($thisline)==0))
{
} else {
$outtext .= $thisline." ";
}
}
$outtext = preg_replace("/[^a-zA-Z0-9s,.-nrt@/_()]/","",$outtext);
return $outtext;
}
/************************ docx file ***********************************/
private function read_docx(){
$striped_content = '';
$content = '';
$zip = zip_open($this->filename);
if (!$zip || is_numeric($zip)) return false;
while ($zip_entry = zip_read($zip)) {
if (zip_entry_open($zip, $zip_entry) == FALSE) continue;
if (zip_entry_name($zip_entry) != "word/document.xml") continue;
$content .= zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
zip_entry_close($zip_entry);
}// end while
zip_close($zip);
$content = str_replace('</w:r></w:p></w:tc><w:tc>', " ", $content);
$content = str_replace('</w:r></w:p>', "rn", $content);
$striped_content = strip_tags($content);
return $striped_content;
}
/************************ odt file ************************************/
function odt_to_text($input_file){
$xml_filename = "content.xml"; //content file name
$zip_handle = new ZipArchive;
$output_text = "";
if(true === $zip_handle->open($input_file)){
if(($xml_index = $zip_handle->locateName($xml_filename)) !== false){
$xml_datas = $zip_handle->getFromIndex($xml_index);
$xml_handle = DOMDocument::loadXML($xml_datas
, LIBXML_NOENT | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
$output_text = strip_tags($xml_handle->saveXML());
}else{
$output_text .="";
}
$zip_handle->close();
}else{
$output_text .="";
}
return $output_text;
}
/************************ rtf file ************************************/
function rtf_isPlainText($s) {
$arrfailAt = array("*", "fonttbl", "colortbl", "datastore", "themedata");
for ($i = 0; $i < count($arrfailAt); $i++)
if (!empty($s[$arrfailAt[$i]])) return false;
return true;
}
function rtf_to_text($input_file) {
// Read the data from the input file.
$text = file_get_contents($input_file);
if (!strlen($text))
return "";
// Create empty stack array.
$output_text = "";
$stack = array();
$j = -1;
// Read the data character-by- character
for ($i = 0, $len = strlen($text); $i < $len; $i++) {
$c = $text[$i];
// Depending on current character select the further actions.
switch ($c) {
// the most important key word backslash
case "\\":
// read next character
$nc = $text[$i + 1];
// If it is another backslash or nonbreaking space or hyphen,
// then the character is plain text and add it to the output stream.
if ($nc == '' && rtf_isPlainText($stack[$j])) $output_text .= '';
elseif ($nc == '~' && rtf_isPlainText($stack[$j])) $output_text .= ' ';
elseif ($nc == '_' && rtf_isPlainText($stack[$j])) $output_text .= '-';
// If it is an asterisk mark, add it to the stack.
elseif ($nc == '*') $stack[$j]["*"] = true;
// If it is a single quote, read next two characters that are the hexadecimal notation
// of a character we should add to the output stream.
elseif ($nc == "'") {
$hex = substr($text, $i + 2, 2);
if (rtf_isPlainText($stack[$j]))
$output_text .= html_entity_decode("&#".hexdec($hex).";");
//Shift the pointer.
$i += 2;
// Since, we've found the alphabetic character, the next characters are control word
// and, possibly, some digit parameter.
} elseif ($nc >= 'a' && $nc <= 'z' || $nc >= 'A' && $nc <= 'Z') {
$word = "";
$param = null;
// Start reading characters after the backslash.
for ($k = $i + 1, $m = 0; $k < strlen($text); $k++, $m++) {
$nc = $text[$k];
// If the current character is a letter and there were no digits before it,
// then we're still reading the control word. If there were digits, we should stop
// since we reach the end of the control word.
if ($nc >= 'a' && $nc <= 'z' || $nc >= 'A' && $nc <= 'Z') {
if (empty($param))
$word .= $nc;
else
break;
// If it is a digit, store the parameter.
} elseif ($nc >= '0' && $nc <= '9')
$param .= $nc;
// Since minus sign may occur only before a digit parameter, check whether
// $param is empty. Otherwise, we reach the end of the control word.
elseif ($nc == '-') {
if (empty($param))
$param .= $nc;
else
break;
} else
break;
}
// Shift the pointer on the number of read characters.
$i += $m - 1;
// Start analyzing what we've read. We are interested mostly in control words.
$toText = "";
switch (strtolower($word)) {
// If the control word is "u", then its parameter is the decimal notation of the
// Unicode character that should be added to the output stream.
// We need to check whether the stack contains ucN control word. If it does,
// we should remove the N characters from the output stream.
case "u":
$toText .= html_entity_decode("&#x".dechex($param).";");
$ucDelta = @$stack[$j]["uc"];
if ($ucDelta > 0)
$i += $ucDelta;
break;
// Select line feeds, spaces and tabs.
case "par": case "page": case "column": case "line": case "lbr":
$toText .= "n";
break;
case "emspace": case "enspace": case "qmspace":
$toText .= " ";
break;
case "tab": $toText .= "t"; break;
// Add current date and time instead of corresponding labels.
case "chdate": $toText .= date("m.d.Y"); break;
case "chdpl": $toText .= date("l, j F Y"); break;
case "chdpa": $toText .= date("D, j M Y"); break;
case "chtime": $toText .= date("H:i:s"); break;
// Replace some reserved characters to their html analogs.
case "emdash": $toText .= html_entity_decode("—"); break;
case "endash": $toText .= html_entity_decode("–"); break;
case "bullet": $toText .= html_entity_decode("•"); break;
case "lquote": $toText .= html_entity_decode("‘"); break;
case "rquote": $toText .= html_entity_decode("’"); break;
case "ldblquote": $toText .= html_entity_decode("«"); break;
case "rdblquote": $toText .= html_entity_decode("»"); break;
// Add all other to the control words stack. If a control word
// does not include parameters, set ¶m to true.
default:
$stack[$j][strtolower($word)] = empty($param) ? true : $param;
break;
}
// Add data to the output stream if required.
if (rtf_isPlainText($stack[$j]))
$output_text .= $toText;
}
$i++;
break;
// If we read the opening brace {, then new subgroup starts and we add
// new array stack element and write the data from previous stack element to it.
case "{":
array_push($stack, $stack[$j++]);
break;
// If we read the closing brace }, then we reach the end of subgroup and should remove
// the last stack element.
case "}":
array_pop($stack);
$j--;
break;
// Skip 'trash'.
case '': case 'r': case 'f': case 'n': break;
// Add other data to the output stream if required.
default:
if (rtf_isPlainText($stack[$j]))
$output_text .= $c;
break;
}
}
// Return result.
return $output_text;
}
/************************excel sheet **********************************/
function xlsx_to_text($input_file){
$xml_filename = "xl/sharedStrings.xml"; //content file name
$zip_handle = new ZipArchive;
$output_text = "";
if(true === $zip_handle->open($input_file)){
if(($xml_index = $zip_handle->locateName($xml_filename)) !== false){
$xml_datas = $zip_handle->getFromIndex($xml_index);
$xml_handle = DOMDocument::loadXML($xml_datas
, LIBXML_NOENT | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
$output_text = strip_tags($xml_handle->saveXML());
}else{
$output_text .="";
}
$zip_handle->close();
}else{
$output_text .="";
}
return $output_text;
}
/***********************power point files*****************************/
function pptx_to_text($input_file){
$zip_handle = new ZipArchive;
$output_text = "";
if(true === $zip_handle->open($input_file)){
$slide_number = 1; //loop through slide files
while(($xml_index = $zip_handle->locateName("ppt/slides/slide"
.$slide_number.".xml")) !== false){
$xml_datas = $zip_handle->getFromIndex($xml_index);
$xml_handle = DOMDocument::loadXML($xml_datas
, LIBXML_NOENT | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
$output_text .= strip_tags($xml_handle->saveXML());
$slide_number++;
}
if($slide_number == 1){
$output_text .="";
}
$zip_handle->close();
}else{
$output_text .="";
}
return $output_text;
}
/************************ pdf file ************************************/
function decodeAsciiHex($input) {
$output = "";
$isOdd = true;
$isComment = false;
for($i = 0, $codeHigh = -1; $i < strlen($input) && $input[$i] != '>'; $i++) {
$c = $input[$i];
if($isComment) {
if ($c == 'r' || $c == 'n')
$isComment = false;
continue;
}
switch($c) {
case '': case 't': case 'r': case 'f': case 'n': case ' ': break;
case '%':
$isComment = true;
break;
default:
$code = hexdec($c);
if($code === 0 && $c != '0')
return "";
if($isOdd)
$codeHigh = $code;
else
$output .= chr($codeHigh * 16 + $code);
$isOdd = !$isOdd;
break;
}
}
if($input[$i] != '>')
return "";
if($isOdd)
$output .= chr($codeHigh * 16);
return $output;
}
function decodeAscii85($input) {
$output = "";
$isComment = false;
$ords = array();
for($i = 0, $state = 0; $i < strlen($input) && $input[$i] != '~'; $i++) {
$c = $input[$i];
if($isComment) {
if ($c == 'r' || $c == 'n')
$isComment = false;
continue;
}
if ($c == '' || $c == 't' || $c == 'r' || $c == 'f' || $c == 'n' || $c == ' ')
continue;
if ($c == '%') {
$isComment = true;
continue;
}
if ($c == 'z' && $state === 0) {
$output .= str_repeat(chr(0), 4);
continue;
}
if ($c < '!' || $c > 'u')
return "";
$code = ord($input[$i]) & 0xff;
$ords[$state++] = $code - ord('!');
if ($state == 5) {
$state = 0;
for ($sum = 0, $j = 0; $j < 5; $j++)
$sum = $sum * 85 + $ords[$j];
for ($j = 3; $j >= 0; $j--)
$output .= chr($sum >> ($j * 8));
}
}
if ($state === 1)
return "";
elseif ($state > 1) {
for ($i = 0, $sum = 0; $i < $state; $i++)
$sum += ($ords[$i] + ($i == $state - 1)) * pow(85, 4 - $i);
for ($i = 0; $i < $state - 1; $i++)
$ouput .= chr($sum >> ((3 - $i) * 8));
}
return $output;
}
function decodeFlate($input) {
return @gzuncompress($input);
}
function getObjectOptions($object) {
$options = array();
if (preg_match("#<<(.*)>>#ismU", $object, $options)) {
$options = explode("/", $options[1]);
@array_shift($options);
$o = array();
for ($j = 0; $j < @count($options); $j++) {
$options[$j] = preg_replace("#s+#", " ", trim($options[$j]));
if (strpos($options[$j], " ") !== false) {
$parts = explode(" ", $options[$j]);
$o[$parts[0]] = $parts[1];
} else
$o[$options[$j]] = true;
}
$options = $o;
unset($o);
}
return $options;
}
function getDecodedStream($stream, $options) {
$data = "";
if (empty($options["Filter"]))
$data = $stream;
else {
$length = !empty($options["Length"]) ? $options["Length"] : strlen($stream);
$_stream = substr($stream, 0, $length);
foreach ($options as $key => $value) {
if ($key == "ASCIIHexDecode")
$_stream = decodeAsciiHex($_stream);
if ($key == "ASCII85Decode")
$_stream = decodeAscii85($_stream);
if ($key == "FlateDecode")
$_stream = decodeFlate($_stream);
}
$data = $_stream;
}
return $data;
}
function getDirtyTexts(&$texts, $textContainers) {
for ($j = 0; $j < count($textContainers); $j++) {
if (preg_match_all("#[(.*)]s*TJ#ismU", $textContainers[$j], $parts))
$texts = array_merge($texts, @$parts[1]);
elseif(preg_match_all("#Tds*((.*))s*Tj#ismU", $textContainers[$j], $parts))
$texts = array_merge($texts, @$parts[1]);
}
}
function getCharTransformations(&$transformations, $stream) {
preg_match_all("#([0-9]+)s+beginbfchar(.*)endbfchar#ismU", $stream, $chars, PREG_SET_ORDER);
preg_match_all("#([0-9]+)s+beginbfrange(.*)endbfrange#ismU", $stream, $ranges, PREG_SET_ORDER);
for ($j = 0; $j < count($chars); $j++) {
$count = $chars[$j][1];
$current = explode("n", trim($chars[$j][2]));
for ($k = 0; $k < $count && $k < count($current); $k++) {
if (preg_match("#<([0-9a-f]{2,4})>s+<([0-9a-f]{4,512})>#is", trim($current[$k]), $map))
$transformations[str_pad($map[1], 4, "0")] = $map[2];
}
}
for ($j = 0; $j < count($ranges); $j++) {
$count = $ranges[$j][1];
$current = explode("n", trim($ranges[$j][2]));
for ($k = 0; $k < $count && $k < count($current); $k++) {
if (preg_match("#<([0-9a-f]{4})>s+<([0-9a-f]{4})>s+<([0-9a-f]{4})>#is", trim($current[$k]), $map)) {
$from = hexdec($map[1]);
$to = hexdec($map[2]);
$_from = hexdec($map[3]);
for ($m = $from, $n = 0; $m <= $to; $m++, $n++)
$transformations[sprintf("%04X", $m)] = sprintf("%04X", $_from + $n);
} elseif (preg_match("#<([0-9a-f]{4})>s+<([0-9a-f]{4})>s+[(.*)]#ismU", trim($current[$k]), $map)) {
$from = hexdec($map[1]);
$to = hexdec($map[2]);
$parts = preg_split("#s+#", trim($map[3]));
for ($m = $from, $n = 0; $m <= $to && $n < count($parts); $m++, $n++)
$transformations[sprintf("%04X", $m)] = sprintf("%04X", hexdec($parts[$n]));
}
}
}
}
function getTextUsingTransformations($texts, $transformations) {
$document = "";
for ($i = 0; $i < count($texts); $i++) {
$isHex = false;
$isPlain = false;
$hex = "";
$plain = "";
for ($j = 0; $j < strlen($texts[$i]); $j++) {
$c = $texts[$i][$j];
switch($c) {
case "<":
$hex = "";
$isHex = true;
break;
case ">":
$hexs = str_split($hex, 4);
for ($k = 0; $k < count($hexs); $k++) {
$chex = str_pad($hexs[$k], 4, "0");
if (isset($transformations[$chex]))
$chex = $transformations[$chex];
$document .= html_entity_decode("&#x".$chex.";");
}
$isHex = false;
break;
case "(":
$plain = "";
$isPlain = true;
break;
case ")":
$document .= $plain;
$isPlain = false;
break;
case "\\":
$c2 = $texts[$i][$j + 1];
if (in_array($c2, array("\\", "(", ")"))) $plain .= $c2;
elseif ($c2 == "n") $plain .= 'n';
elseif ($c2 == "r") $plain .= 'r';
elseif ($c2 == "t") $plain .= 't';
elseif ($c2 == "b") $plain .= 'b';
elseif ($c2 == "f") $plain .= 'f';
elseif ($c2 >= '0' && $c2 <= '9') {
$oct = preg_replace("#[^0-9]#", "", substr($texts[$i], $j + 1, 3));
$j += strlen($oct) - 1;
$plain .= html_entity_decode("&#".octdec($oct).";");
}
$j++;
break;
default:
if ($isHex)
$hex .= $c;
if ($isPlain)
$plain .= $c;
break;
}
}
$document .= "n";
}
return $document;
}
function pdf_to_text($input_file) {
$infile = @file_get_contents($input_file, FILE_BINARY);
if (empty($infile))
return "";
$transformations = array();
$texts = array();
preg_match_all("#obj(.*)endobj#ismU", $infile, $objects);
$objects = @$objects[1];
for ($i = 0; $i < count($objects); $i++) {
$currentObject = $objects[$i];
if (preg_match("#stream(.*)endstream#ismU", $currentObject, $stream)) {
$stream = ltrim($stream[1]);
$options = getObjectOptions($currentObject);
if (!(empty($options["Length1"]) && empty($options["Type"]) && empty($options["Subtype"])))
continue;
$data = getDecodedStream($stream, $options);
if (strlen($data)) {
if (preg_match_all("#BT(.*)ET#ismU", $data, $textContainers)) {
$textContainers = @$textContainers[1];
getDirtyTexts($texts, $textContainers);
} else
getCharTransformations($transformations, $data);
}
}
}
$output_text=getTextUsingTransformations($texts, $transformations);
return $output_text;
}
public function convertToText() {
if(isset($this->filename) && !file_exists($this->filename)) {
return "File Not exists";
}
$fileArray = pathinfo($this->filename);
$file_ext = $fileArray['extension'];
$ext=array('doc','docx','odt','rtf','xlsx','pptx','pdf');
if(in_array($file_ext,$ext))
{
if($file_ext == "doc") {
return $this->read_doc();
} elseif($file_ext == "docx") {
return $this->read_docx();
} elseif($file_ext == "odt") {
return $this->odt_to_text();
} elseif($file_ext == "rtf") {
return $this->rtf_to_text();
} elseif($file_ext == "xlsx") {
return $this->xlsx_to_text();
}elseif($file_ext == "pptx") {
return $this->pptx_to_text();
}elseif($file_ext == "pdf") {
return $this->pdf_to_text();
}
} else {
return "Invalid File Type";
}
}
}
//-usage
$docObj = new DocxConversion("test.doc");
//$docObj = new DocxConversion("test.docx");
//$docObj = new DocxConversion("test.odt");
//$docObj = new DocxConversion("test.rtf");
//$docObj = new DocxConversion("test.xlsx");
//$docObj = new DocxConversion("test.pptx");
//$docObj = new DocxConversion("test.pdf");
echo $docText= $docObj->convertToText();