WRPG_PIAF_MAGIC_HEADER : "WRPGPIAF" <=> 8 bytes (not \0 terminated)
WRPG_PIAF_CHECKSUM : unsigned long long <=> 8 bytes
WRPG_PIAF_VERSION : unsigned int <=> 4 bytes
WRPG_PIAF_NB_FILES : unsigned int <=> 4 bytes
WRPG_PIAF_DATA_SIZE : unsigned int <=> 4 bytes
<padding> : <filler> <=> 4 bytes
Effective size : 32 bytes.
WRPG_PIAF_FILENAME : char[8] <=> 8 bytes (not \0 terminated)
WRPG_PIAF_FILETYPE : enumeration <=> 4 bytes
WRPG_PIAF_COMPRESSION_TYPE : enumeration <=> 4 bytes
WRPG_PIAF_FILESIZE : unsigned int <=> 4 bytes
WPRG_PIAF_DATA_OFFSET : unsigned int <=> 4 bytes
Effective size = 24 bytes per file.
0 = UNKNOWN
1 = MAP
2 = EVENT_LIST
3 = TEXT
4 = SPRITESHEET
0 = RAW
1 = ZLIB
2 = RLE (?)