SimpleArchiver/file_format.md

# File Format

## Format Version 0

File extension is "*.simplearchive"

First 18 bytes of file will be:

    SIMPLE_ARCHIVE_VER

Next 2 bytes is 16-bit unsigned integer "version" in big-endian. In this case,
it will be zero.

Next 4 bytes are bit-flags.

1. The first byte
    1. The first bit is set if de/compressor is set for this archive.

The remaining unused flags are reserved for future revisions and are currently
ignored.

If the previous "de/compressor is set" flag is enabled, then the next section is
added:

1. 2 bytes is 16-bit unsigned integer "compressor cmd+args" in big-endian. This
   does not include the NULL at the end of the string.
2. X bytes of "compressor cmd+args" (length defined by previous value). Is a
   NULL-terminated string.
3. 2 bytes is 16-bit unsigned integer "decompressor cmd+args" in big-endian.
   This does not include the NULL at the end of the string.
4. X bytes of "decompressor cmd+args" (length defined by previous value). Is a
   NULL-terminated string.

The next 4 bytes is 32-bit unsigned integer "file count" in big-endian which
will indicate the number of files in this archive.

Following the file-count bytes, the following bytes are added for each file:

1. 2 bytes is 16-bit unsigned integer "filename length" in big-endian. This does
   not include the NULL at the end of the string.
2. X bytes of filename (length defined by previous value). Is a NULL-terminated
   string.
3. 4 bytes bit-flags
    1. The first byte
        1. The first bit is set if the file is a symbolic link.
    2. The second byte.
        1. Currently unused.
    3. The third byte.
        1. Currently unused.
    4. The fourth byte.
        1. Currently unused.
4. If this file is a symbolic link:
    1. 2 bytes is 16-bit unsigned integer "link target path" in big-endian. This
       does not include the NULL at the end of the string.
    2. X bytes of link-target-path (length defined by previous value). Is a
       NULL-terminated string.
5. If this file is NOT a symbolic link:
    1. 8 bytes 64-bit unsigned integer "size of filename in this archive file".
    2. X bytes file data (length defined by previous value).