Offset   Length   Contents
  0      4 bytes  Local file header signature (0x04034b50)
  4      2 bytes  Version needed to extract
  6      2 bytes  General purpose bit flag
  8      2 bytes  Compression method
 10      2 bytes  Last mod file time
 12      2 bytes  Last mod file date
 14      4 bytes  CRC-32
 18      4 bytes  Compressed size (n)
 22      4 bytes  Uncompressed size
 26      2 bytes  Filename length (f)
 28      2 bytes  Extra field length (e)
        (f)bytes  Filename
        (e)bytes  Extra field
        (n)bytes  Compressed data

      end of central dir signature    4 bytes  (0x06054b50)
      number of this disk             2 bytes
      number of the disk with the
      start of the central directory  2 bytes
      total number of entries in the
      central directory on this disk  2 bytes
      total number of entries in
      the central directory           2 bytes
      size of the central directory   4 bytes
      offset of start of central
      directory with respect to
      the starting disk number        4 bytes
      .ZIP file comment length        2 bytes
      .ZIP file comment       (variable size)

...
заголовки
...
--uuid:58acaebc-26ee-46bb-b187-7d27a9eeb485
Content-Id:<69eee70b-0f5c-420d-ae9c-88aa3aaa03e3>
Content-Type: application/binary
Content-ID: 69eee70b-0f5c-420d-ae9c-88aa3aaa03e3
Content-Transfer-Encoding: binary

тут бинарный код файл
--uuid:58acaebc-26ee-46bb-b187-7d27a9eeb485--