public function parse(PdfStream $stream)
{
$charmap = new CharMap();
$matches = array();
$stream->rewind();
$line = trim($stream->gets());
// want_begin, want_line_or_end, end
$state = 'want_begin';
while ($line !== false && $state !== 'end') {
switch (true) {
case 1 === preg_match('/^[0-9]+ beginbfchar$/', $line):
if ($state === 'want_begin') {
$state = 'want_line_or_end';
} else {
throw new PdfException('Unexpected beginbfchar');
}
break;
case 1 === preg_match('/^endbfchar$/', $line):
if ($state === 'want_line_or_end') {
$state = 'end';
} else {
throw new PdfException('Unexpected endbfchar');
}
break;
case 1 === preg_match('/^<([0-9A-Fa-f]+)> <([0-9A-Fa-f]+)>$/', $line, $matches):
if ($state === 'want_begin') {
// nop, I guess
} elseif ($state === 'want_line_or_end') {
$key = base_convert($matches[1], 16, 10);
$value = $this->utf8(base_convert($matches[2], 16, 10));
$charmap[$key] = $value;
} else {
throw new PdfException('Unknown state');
}
break;
default:
if ($state !== 'want_begin') {
throw new PdfException('Unkown state (default)');
}
break;
}
$line = trim($stream->gets());
}
if ($state !== 'end') {
throw new PdfException('end not reached');
}
return $charmap;
}
/**
*
* @param int $offset
* @return PdfIndirectObject
* @throws PdfException
*/
protected function parseObjectFromOffset($offset)
{
$matches = array();
$object = array();
$this->stream->seek($offset);
// assert "<x> <y> obj"
if (false === $this->stream->consume([['/[0-9]/', '+'], ['/\\s/', '+'], ['/[0-9]/', '+'], ['/\\s/', '+'], 'obj', ['/[^a-z]/']], $matches)) {
throw new PdfException('No object at ' . $offset);
}
$this->stream->seek(-1, SEEK_CUR);
$object['id'] = (int) $matches[0];
$object['revision'] = (int) $matches[2];
// Load PDF object
list($endPos, $value) = $this->objectParser->getNextObjectFromString($this->source, $this->stream->tell());
$this->stream->seek($endPos);
// Assert key word
if (false === $this->stream->consume([['/\\s/', '*'], ['/[a-z]/', '+'], ['/[^a-z]/']], $matches)) {
throw new PdfException('No key word found at ' . $this->stream->tell());
}
$this->stream->seek(-1, SEEK_CUR);
$keyWord = $matches[1];
switch ($keyWord) {
case 'stream':
if (!$value instanceof PdfDictionary) {
throw new PdfException('Value has to be a dictionary');
}
$this->stream->push();
$length = $this->resolveRef($value->get('/Length'));
$this->stream->pop();
$chars = $this->stream->read(2);
if ($chars === "\r\n") {
// nop
} elseif ($chars[0] === "\n") {
$this->stream->seek(-1, SEEK_CUR);
} else {
throw new PdfException('Expected \\n or \\r\\n after stream key word');
}
$value = new PdfStreamObject($value, $this->stream->tell(), $length);
$this->stream->seek($length, SEEK_CUR);
// Assert "endstream"
if (!$this->stream->consume([['/\\s/', '*'], 'endstream'])) {
throw new PdfException('Expected endstream key word');
}
// Assert "endobj"
if (!$this->stream->consume([['/\\s/', '*'], 'endobj'])) {
throw new PdfException('Expected endobj key word');
}
break;
case 'endobj':
// nop
break;
default:
throw new PdfException('Unexpected key word ' . $keyWord);
break;
}
$object['value'] = $value;
return new PdfIndirectObject($object['id'], $object['revision'], $object['value']);
}
/**
*
* @param PdfStreamObject $streamObj
* @return string
* @throws PdfException
*/
public function decodeStream(PdfStreamObject $streamObj)
{
$this->stream->push();
$this->stream->seek($streamObj->getStartOffset());
$stream = $this->stream->read($streamObj->getLength());
$this->stream->pop();
$options = $streamObj->getDictionary();
$filters = $options->get('/Filter');
$ret = $stream;
if (!is_array($filters)) {
$filters = new PdfArray(array($filters));
}
foreach ($filters as $filter) {
if (!array_key_exists($filter, $this->decoders)) {
throw new PdfException(sprintf('No decoder found for %s.', $filter));
}
$ret = $this->decoders[$filter]->decode($ret);
}
return $ret;
}
/**
*
* @param string $stream
*/
public function loadFromStream(PdfStream $stream)
{
$this->reset();
$stream->push();
list($this->crossReferenceTable, $this->trailer) = $this->crossReferenceTableParser->parse($stream);
$stream->pop();
$stream->push();
$this->objectRepository = new ObjectRepository($stream, $this->crossReferenceTable);
$stream->pop();
$this->stream = $stream;
$this->streamDecoder = new StreamDecoder($this->stream);
// if ($this->trailer->has('/Info')) {
// $ref = $this->trailer->get('/Info');
// $infoDict = $this->objectRepository->getObjectByIdAndRevision($ref->getTargetId(), $ref->getTargetRevision())->getValue();
//
// var_dump($infoDict);
// }
}
/**
*
* @param PdfStream $stream
* @return PdfDictionary
* @throws PdfException
*/
protected function parseTrailer(PdfStream $stream)
{
if (trim($stream->gets()) !== 'trailer') {
throw new PdfException('trailer expected');
}
list(, $object) = $this->objectParser->getNextObjectFromString($stream->getContents(), 0);
if (!$object instanceof PdfDictionary) {
throw new PdfException('No dictionary found in trailer');
}
return $object;
}
public function getText(PdfStream $stream, array $charMaps)
{
$this->charMaps = $charMaps;
$this->data = array('font' => '');
$textObjectLexer = new TextObjectLexer();
$stream->rewind();
$source = $stream->getContents();
$offset = 0;
$count = strlen($source);
$text = '';
// default, in_array
$state = 'default';
$operandBuffer = array();
while ($offset < $count) {
$token = $textObjectLexer->getNextTokenFromString($source, $offset);
$tokenContent = substr($source, $offset, $token->newPos - $offset);
switch ($token->tokenName) {
case 'white_space':
// nop. Ignore white space
break;
case 'operator':
if ($state === 'default') {
$response = $this->runOperator($operandBuffer, $tokenContent);
if ($response['type'] === 'text') {
$text .= $response['content'];
}
$operandBuffer = array();
} else {
throw new PdfException('Unexpected token ' . $token->tokenName);
}
break;
case 'numeric':
case 'name':
case 'boolean':
case 'string':
case 'null':
if ($state === 'default') {
$operandBuffer[] = $tokenContent;
} elseif ($state === 'in_array') {
$operandBuffer[] = $tokenContent;
} else {
throw new PdfException('Unexpected token ' . $token->tokenName);
}
break;
case 'array_start':
if ($state === 'default') {
if (count($operandBuffer) > 0) {
throw new PdfException('array_start but operand buffer not emtpy');
}
$state = 'in_array';
} else {
throw new PdfException('Unexpected token ' . $token->tokenName);
}
break;
case 'array_end':
if ($state === 'in_array') {
$newArray = new Objects\PdfArray();
foreach ($operandBuffer as $entry) {
$newArray[] = $entry;
}
$operandBuffer = array();
$operandBuffer[] = $newArray;
$state = 'default';
} else {
throw new PdfException('Unexpected token ' . $token->tokenName);
}
break;
default:
throw new PdfException('Unknown token ' . $token->tokenName);
break;
}
$offset = $token->newPos;
}
if ($state !== 'default') {
throw new PdfException('default state expected, ' . $state . ' given');
}
if (count($operandBuffer) !== 0) {
throw new PdfException('Empty operand buffer expected');
}
return $text;
}
