7zlist

File list can be obtained by running either:

    7z l FILE          (for a short list)
    7z l -slt FILE     (for a long list)

Examination of the outputs of both commands led to following observations:

  - Both commands produce output with common header when run with the same
    archive file using the same version of 7-Zip.

  - Both commands may produce output with common footer (e.g. warnings).

  - By keeping both outputs in sync, it is possible to extract the middle
    (files) part. This approach should work mostly reilably.

  - Output produced by 7-Zip 16.02 is vulnerable to embedded new-line
    characters. Therefore keeping short and long list in sync is essential
    for improved reliability.

  - Output produced by 7-Zip 18.05 is still vulnerable in header part
    (comments), but in files part problematic characters are replaced by
    underscore. Although the output is still not perfect, it can be used
    to help find lies in list produced by 7-Zip 16.02.

  - Header may contain fields that may contain new-line characters
    (e.g. Label, Comment). Although Comment seems to be mostly the last
    thing, it can get mixed with optional parts of the header with makes
    it technically undistinguishable.

  - A line must contain ' = ' substring to be considered a key-value pair.

  - When a key-pair line (without trailing new-line character) is split into
    pieces, no trimming should be performed on any of them.

  - Archive information is stored in header which consists of:

      string '--'
      set of key-value pairs
      optionally
        string '----'
        set of key-value pairs
        string '--'
        set of key-value pairs
      empty line

  - Final set of header's key-value pairs seems unified.

  - Short file list begins with

      string '   Date      Time    Attr         Size   Compressed  Name'
      string '------------------- ----- ------------ ------------  ------------------------'

  - Short file list ends with
  
      string '------------------- ----- ------------ ------------  ------------------------'
      summary
      optional extra information

  - Long file list begins with

      string '----------'

  - Entry of long file list consists of:

      set of key-value pairs
      empty line

  - Synchronization of short and long list:

    $filename is a file name which may contain new-line characters. This is
    also the point where the parsing program should start comparing bytes in
    both list. Every equal byte should be considered a part of file name.
    The first difference should be considered the first byte that is not part
    of file name and synchronization should be stopped until the next entry.

    Note that file name will contain new-line character and the ehd which is
    supposed to be stripped off to obtain the real file name.

    Sample entry of short list:

      2018-12-09 19:09:41 .R..A    109198568    302090359  $filename

    Sample entry of long list:

      Path = $filename
      Size = 109198568
      Packed Size = 302090359
      Modified = 2018-12-09 19:09:41
      Attributes = RA_ -r--r--r--
      CRC = 57ABEFFB
      Encrypted = -
      Method = LZMA2:26
      Block = 0