Method loadZipDetails

lib/ZipFile/ZipFile.cpp:218–270

}

bool ZipFile::loadZipDetails() {
  if (zipDetails.isSet) {
    return true;
  }

  const ScopedOpenClose zip{*this};
  if (!zip) return false;

  const size_t fileSize = file.size();
  if (fileSize < 22) {
    LOG_ERR("ZIP", "File too small to be a valid zip");
    return false;  // Minimum EOCD size is 22 bytes
  }

  // We scan the last 1KB (or the whole file if smaller) for the EOCD signature
  // 0x06054b50 is stored as 0x50, 0x4b, 0x05, 0x06 in little-endian
  const int scanRange = fileSize > 1024 ? 1024 : fileSize;
  const auto buffer = static_cast<uint8_t*>(malloc(scanRange));
  if (!buffer) {
    LOG_ERR("ZIP", "Failed to allocate memory for EOCD scan buffer");
    return false;
  }

  file.seek(fileSize - scanRange);
  file.read(buffer, scanRange);

  // Scan backwards for the signature
  int foundOffset = -1;
  for (int i = scanRange - 22; i >= 0; i--) {
    constexpr uint32_t signature = 0x06054b50;
    if (*reinterpret_cast<uint32_t*>(&buffer[i]) == signature) {
      foundOffset = i;
      break;
    }
  }

  if (foundOffset == -1) {
    LOG_ERR("ZIP", "EOCD signature not found in zip file");
    free(buffer);
    return false;
  }

  // Now extract the values we need from the EOCD record
  // Relative positions within EOCD:
  // Offset 10: Total number of entries (2 bytes)
  // Offset 16: Offset of start of central directory with respect to the starting disk number (4 bytes)
  zipDetails.totalEntries = *reinterpret_cast<uint16_t*>(&buffer[foundOffset + 10]);
  zipDetails.centralDirOffset = *reinterpret_cast<uint32_t*>(&buffer[foundOffset + 16]);
  zipDetails.isSet = true;

  free(buffer);
  return true;
}

bool ZipFile::open() {
  if (!Storage.openFileForRead("ZIP", filePath, file)) {