protected function resolveFileHeader()
    {
        if ($this->fileHeader) {
            return $this->fileHeaderOffset;
        }

        $this->streamReader->reset(0);
        $offset = false;
        $maxIterations = 1000;
        while (true) {
            $buffer = $this->streamReader->getBuffer(false);
            $offset = \strpos($buffer, '%PDF-');
            if ($offset === false) {
                if (!$this->streamReader->increaseLength(100) || (--$maxIterations === 0)) {
                    throw new PdfParserException(
                        'Unable to find PDF file header.',
                        PdfParserException::FILE_HEADER_NOT_FOUND
                    );
                }
                continue;
            }
            break;
        }

        $this->fileHeaderOffset = $offset;
        $this->streamReader->setOffset($offset);

        $this->fileHeader = \trim($this->streamReader->readLine());
        return $this->fileHeaderOffset;
    }
protected function resolveFileHeader()
    {
        if ($this->fileHeader) {
            return $this->fileHeaderOffset;
        }

        $this->streamReader->reset(0);
        $offset = false;
        $maxIterations = 1000;
        while (true) {
            $buffer = $this->streamReader->getBuffer(false);
            $offset = \strpos($buffer, '%PDF-');
            if ($offset === false) {
                if (!$this->streamReader->increaseLength(100) || (--$maxIterations === 0)) {
                    throw new PdfParserException(
                        'Unable to find PDF file header.',
                        PdfParserException::FILE_HEADER_NOT_FOUND
                    );
                }
                continue;
            }
            break;
        }

        $this->fileHeaderOffset = $offset;
        $this->streamReader->setOffset($offset);

        $this->fileHeader = \trim($this->streamReader->readLine());
        return $this->fileHeaderOffset;
    }
protected function resolveFileHeader ( ) { if ( $ this -> fileHeader ) { return $ this -> fileHeaderOffset ; } $ this -> streamReader -> reset ( 0 ) ; $ offset = false ; $ maxIterations = 1000 ; while ( true ) { $ buffer = $ this -> streamReader -> getBuffer ( false ) ; $ offset = \ strpos ( $ buffer , '%PDF-' ) ; if ( $ offset === false ) { if ( ! $ this -> streamReader -> increaseLength ( 100 ) || ( -- $ maxIterations === 0 ) ) { throw new PdfParserException ( 'Unable to find PDF file header.' , PdfParserException :: FILE_HEADER_NOT_FOUND ) ; } continue ; } break ; } $ this -> fileHeaderOffset = $ offset ; $ this -> streamReader -> setOffset ( $ offset ) ; $ this -> fileHeader = \ trim ( $ this -> streamReader -> readLine ( ) ) ; return $ this -> fileHeaderOffset ; }
Resolves the file header.

@throws PdfParserException
@return int
Resolves the file header .