1. <?php
  3. /**
  4. * Replaces binary file values with simple error messages for exploratory work.
  5. *
  6. * @param string $filePath Path to the binary file.
  7. * @return bool True on success, false on failure.
  8. */
  9. function replaceBinaryValues(string $filePath): bool
  10. {
  11. if (!file_exists($filePath)) {
  12. error_log("Error: File not found: $filePath"); // Log error
  13. return false;
  14. }
  16. if (!is_readable($filePath)) {
  17. error_log("Error: File not readable: $filePath"); // Log error
  18. return false;
  19. }
  21. $fileHandle = fopen($filePath, 'rb'); // Open file in binary read mode
  23. if ($fileHandle === false) {
  24. error_log("Error: Could not open file: $filePath"); // Log error
  25. return false;
  26. }
  28. $chunkSize = 4096; // Read in chunks
  29. while (!feof($fileHandle)) {
  30. $chunk = fread($fileHandle, $chunkSize); // Read a chunk of data
  32. if ($chunk === false) {
  33. error_log("Error: Failed to read from file: $filePath"); // Log error
  34. fclose($fileHandle);
  35. return false;
  36. }
  38. // Replace each byte with an error message
  39. for ($i = 0; $i < strlen($chunk); $i++) {
  40. $chunk[$i] = ord("ERROR"); // Replace with the ASCII value of "ERROR"
  41. }
  43. fwrite($fileHandle, $chunk); // Write the modified chunk back to the file
  44. }
  46. fclose($fileHandle); // Close the file
  48. return true;
  49. }
  51. // Example usage:
  52. if (php_sapi_name() == 'cli') { // Check if running from command line
  53. $filePath = 'your_binary_file.bin'; // Replace with your file path
  54. if (replaceBinaryValues($filePath)) {
  55. echo "Binary file processed successfully.\n";
  56. } else {
  57. echo "Binary file processing failed.\n";
  58. }
  59. } else {
  60. echo "This script is designed to be run from the command line.\n";
  61. }
  63. ?>

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