1. <?php
  3. /**
  4. * Attaches metadata to binary files for sandbox usage.
  5. *
  6. * @param string $filePath Path to the binary file.
  7. * @param array $metadata An associative array of metadata key-value pairs.
  8. * Example: ['author' => 'John Doe', 'date_created' => '2023-10-27']
  9. * @return bool True on success, false on failure.
  10. */
  11. function attachMetadataToBinaryFile(string $filePath, array $metadata): bool
  12. {
  13. if (!file_exists($filePath)) {
  14. error_log("File not found: $filePath");
  15. return false;
  16. }
  18. $metadataString = json_encode($metadata, JSON_PRETTY_PRINT); // Encode metadata to JSON
  20. if ($metadataString === false) {
  21. error_log("Failed to encode metadata to JSON: " . json_last_error_msg());
  22. return false;
  23. }
  25. $fileHandle = fopen($filePath, 'r+'); // Open file for reading and writing
  26. if ($fileHandle === false) {
  27. error_log("Failed to open file for reading/writing: $filePath");
  28. return false;
  29. }
  31. // Get the current file size
  32. $fileSize = filesize($filePath);
  34. // Write metadata to the beginning of the file
  35. $metadataLength = strlen($metadataString);
  36. if (fseek($fileHandle, 0, SEEK_SET) === -1) {
  37. fclose($fileHandle);
  38. error_log("Failed to seek to the beginning of the file: $filePath");
  39. return false;
  40. }
  42. if (fwrite($fileHandle, $metadataLength . "\n" . $metadataString . "\n") === false) {
  43. fclose($fileHandle);
  44. error_log("Failed to write metadata to file: $filePath");
  45. return false;
  46. }
  48. fclose($fileHandle);
  49. return true;
  50. }
  53. //Example usage
  54. /*
  55. $filePath = 'test.bin'; // Replace with your binary file path
  56. $metadata = [
  57. 'author' => 'Sandbox User',
  58. 'date_created' => date('Y-m-d H:i:s'),
  59. 'version' => '1.0'
  60. ];
  62. if (attachMetadataToBinaryFile($filePath, $metadata)) {
  63. echo "Metadata attached successfully to $filePath\n";
  64. } else {
  65. echo "Failed to attach metadata to $filePath\n";
  66. }
  67. */
  71. ?>

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