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<?php |
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/******************************************** |
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* DBF-file MEMO-fields Reader |
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* |
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* Author: Chizhov Nikolay <[email protected]> |
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* (c) 2019-2024 CIOB "Inok" |
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********************************************/ |
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namespace Inok\Dbf; |
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use Exception; |
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class Memo { |
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private $headers = null; |
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private $db, $fp; |
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private $signature = [ |
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0 => "template|picture", |
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1 => "text", |
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2 => "object", |
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4294903808 => "dbaseIV" |
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]; |
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private $isBase4 = false; |
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private $isBase3 = false; |
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/** |
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* @throws Exception |
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*/ |
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public function __construct($file) { |
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$this->db = $file; |
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$this->open(); |
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} |
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public function __destruct() { |
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$this->close(); |
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} |
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/** |
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* @throws Exception |
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*/ |
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private function open() { |
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if (!file_exists($this->db)) { |
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throw new Exception(sprintf('Memo-file %s cannot be found', $this->db)); |
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} |
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$this->fp = fopen($this->db, "rb"); |
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} |
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public function getHeaders() { |
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if (is_null($this->headers)) { |
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$this->readHeaders(); |
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} |
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return $this->headers; |
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} |
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public function getMemo($block) { |
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if (is_null($this->headers)) { |
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$this->readHeaders(); |
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} |
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return $this->readMemo($block); |
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} |
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public function close() { |
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if (get_resource_type($this->fp) === "file") { |
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fclose($this->fp); |
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} |
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} |
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private function readHeaders() { |
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$data = fread($this->fp, 512); |
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$fileExt = strtolower(pathinfo($this->db, PATHINFO_EXTENSION)); |
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$fileName = ""; |
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if ($fileExt == "dbt") { |
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$fileName = trim(substr($data, 8, 8)); |
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if (empty($fileName)) { |
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$this->isBase3 = true; |
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} else { |
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$this->isBase4 = true; |
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} |
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} |
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if ($this->isBase3) { |
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$this->headers = [ |
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"freeblock_position" => unpack("L", substr($data, 0, 4))[1], |
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"block_size" => 512 |
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]; |
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return; |
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} |
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if ($this->isBase4) { |
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$this->headers = [ |
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"freeblock_position" => unpack("L", substr($data, 0, 4))[1], |
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"block_size" => unpack("S", substr($data, 20, 2))[1], |
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"dbf-file" => $fileName |
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]; |
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return; |
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} |
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$this->headers = [ |
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"freeblock_position" => unpack("N", substr($data, 0, 4))[1], |
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"block_size" => unpack("n", substr($data, 6, 2))[1] |
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]; |
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} |
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private function readMemo($block) { |
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fseek($this->fp, $this->headers["block_size"] * $block); |
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if ($this->isBase3) { |
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$text = ""; |
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while (!preg_match('/\x1a\x1a/', $text)) { |
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$text .= fread($this->fp, 512); |
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} |
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$memo["text"] = $this->parseDBase3($text); |
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return $memo; |
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} |
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$data = fread($this->fp, 8); |
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if ($this->isBase4) { |
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$memo = [ |
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"signature" => $this->signature[unpack("N", substr($data, 0, 4))[1]], |
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"length" => octdec(intval(bin2hex(trim(substr($data, 4, 4))))) |
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]; |
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$memo["text"] = $this->parseDBase4(fread($this->fp, $memo["length"])); |
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return $memo; |
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} |
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$memo = [ |
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"signature" => $this->signature[unpack("N", substr($data, 0, 4))[1]], |
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"length" => unpack("N", substr($data, 4, 4))[1] |
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]; |
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$memo["text"] = fread($this->fp, $memo["length"]); |
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return $memo; |
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} |
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private function parseDBase3($text) { |
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if (preg_match('/\x1a\x1a/', $text, $matches, PREG_OFFSET_CAPTURE)) { |
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$text = substr($text, 0, $matches[0][1]); |
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} |
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return $text; |
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} |
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private function parseDBase4($text) { |
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if (preg_match('/\x0d\x0a/', $text, $matches, PREG_OFFSET_CAPTURE)) { |
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$text = substr($text, 0, $matches[0][1]); |
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} |
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return preg_replace('/\x8d\x0a/', "\n", $text); |
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} |
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} |
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nchizhov /
inok-dbf
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