{MAGIC(4bytes)}
{VERSION(3bytes)[maj,min,rev]}
{ORIG_FILE_SIZE(8bytes)}                -- Was 4bytes before 0.8.38
{NUM_BLOCKS(4bytes)}
{BLOCK_SIZE_UNCOMPR(4bytes)},
{GLOBAL_OPTIONS(1byte)}
{EXTD_SIZE(4bytes)}                     -- 8bytes if GLOBAL_OPTIONS includes LARGE_EXTD_AREA
(EXTD):{
	{OPTION(1byte)}
	{OPTION_IS_CRITICAL(1byte)}     -- Only present if the EXTD_AREA_INCLUDES_CRITICAL bit is set in GLOBAL_OPTIONS
	{OPTION_SIZE(4bytes)}           -- 8bytes if GLOBAL_OPTIONS includes LARGE_EXTD_AREA
	{OPTION_VAL(OPTION_SIZE bytes)}
}
(BLOCK):{
	{ALGO(1byte)}
	{BLOCK_SIZE([BYTESIZE(BLOCK_SIZE)] bytes)}
	{BLOCK(BLOCK_SIZE bytes)}
}
*OPTIONAL: {MAGIC_PEOF(4 bytes), if found:}
                  {ORIG_FILE_SIZE(8bytes)}   -- Was 4bytes before 0.8.38
------
MAGIC = {0x44, 0x43, 0x54, 0xC3}
MAGIC_PEOF = {0xFF, 0x3F, 0xDE, 0x08}
------
GLOBAL_OPTIONS (bitmask):
	0x1       LARGE_EXTD_AREA  (added in 0.9.0)
	0x2       EXTD_AREA_INCLUDES_CRITICAL (added in 0.9.0)
	0x4       RESERVED
	0x8       RESERVED
	0x10      RESERVED
	0x20      RESERVED
	0x40      RESERVED
	0x80      RESERVED
------
EXTD Area OPTIONS:
	0         CRC (adler32) of compressed file in network byte order (Integer)
	1         CRC (adler32) of uncompressed file in network byte order (Integer)
	2         Time stamp of original file (ASCII of ISO8601)
	3         Basic UNIX permissions of original file (Integer)
	4         Original filename (ASCII)
	5         MD5 of original file (binary, 16 bytes)
	6         Description (ASCII)
	7         URL (ASCII) to download data from instead of local copy (may
	          occur multiple times, will be tried in order -- first
	          working URL is used)
	8         URL file (ASCII) path to file containing new-line separated
	          URLs (may occur multiple times, will be tried in order --
	          first working URL is used)
	9         Cipher (Integer)
	10        No-op
	11        IDXDATA (Not used) ?
	12        SFX length (Not used) ?
	13        SHA256 of original file (binary)
------
ALGO values:
	0         Uncompressed
	1         RLE Compression
	2         Delta Compression
	3         Text Compression
	4         Zlib Compression
	5         Modified Zlib Compression
	6         Seminibble Encoding
	7         Range Encoding
	8         Second Modified Zlib Compression
	9         Bzip2 Compression
	10        Factor Compression
	11        Bitsums Compression
	12        Text RLE Compression
	13        LZO-1x Compression
	14        LZO-1y Compression
	15        LZO-2a Compression
	255       Reserved / Invalid