Re: [PATCH 13/22] documentation: add documentation of the index-v5 file format

> +== File entry (fileentries)
> +
> +  File entries are sorted in ascending order on the name field, after the
> +  respective offset given by the directory entries. All file names are
> +  prefix compressed, meaning the file name is relative to the directory.
> +
> +  filename (variable length, nul terminated). The exact encoding is
> +    undefined, but the filename cannot contain a NUL byte (iow, the same
> +    encoding as a UNIX pathname).
> +
> +  flags (16-bits): 'flags' field split into (high to low bits)
> +
> +    assumevalid (1-bit): assume-valid flag
> +
> +    intenttoadd (1-bit): intent-to-add flag, used by "git add -N".
> +      Extended flag in index v3.
> +
> +    stage (2-bit): stage of the file during merge
> +
> +    skipworktree (1-bit): skip-worktree flag, used by sparse checkout.
> +      Extended flag in index v3.
> +
> +    smudged (1-bit): indicates if the file is racily smudged.
> +
> +    10-bit unused, must be zero [6]
> +
> +  mode (16-bits): file mode, split into (high to low bits)
> +
> +    objtype (4-bits): object type
> +      valid values in binary are 1000 (regular file), 1010 (symbolic
> +      link) and 1110 (gitlink)
> +
> +    3-bit unused
> +
> +    permission (9-bits): unix permission. Only 0755 and 0644 are valid
> +      for regular files. Symbolic links and gitlinks have value 0 in
> +      this field.
> +
> +  mtimes (32-bits): mtime seconds, the last time a file's data changed
> +    this is stat(2) data
> +
> +  mtimens (32-bits): mtime nanosecond fractions
> +    this is stat(2) data
> +
> +  file size (32-bits): The on-disk size, trucated to 32-bit.
> +    this is stat(2) data
> +
> +  statcrc (32-bits): crc32 checksum over ctime seconds, ctime
> +    nanoseconds, ino, dev, uid, gid (All stat(2) data
> +    except mtime and file size). If the statcrc is 0 it will
> +    be ignored. [7]
> +
> +  objhash (160-bits): SHA-1 for the represented object
> +
> +  entrycrc (32-bits): crc32 checksum for the file entry. The crc code
> +    includes the offset to the offset to the file, relative to the
> +    beginning of the file.