استخراج متن از پی دی اف

[totti2007]

با سلام خدمت اساتید برنامه نویس

میخواستم بدونم هیچکدوم از دوستان راه حل عملی برای استخراج متن از پی دی اف که نیاز به نصب نرم افزار روی سرور نداشته باشه و تماما کد یا کلاس باشه سراغ دارند یا خیر؟

من پس از تحقیقات بسیار به این کد رسیدم که اینم خیلی از پی دی اف ها رو ناقص استخراج میکنه خیلی ها رو هم هیچی :افسرده:

ممنون میشم اگه راهنمایی بفرمایید


<?php

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 '\0': 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 == '\0' || $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("#Td\s*(\(.*\))\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 pdf2text($filename) {
$infile = @file_get_contents($filename, 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);
}
}
}

return getTextUsingTransformations($texts, $transformations);
}

$result = pdf2text ('1.pdf');
echo $result;
?>