I want to turn this into a repacker. Please help. Thanks.

 

endian little
get myname FILENAME
get myext EXTENSION
if myext != "RAX"
    print "Please run this script on a .RAX file"
    cleanexit
endif

get DAT_SIZE asize
idstring "RAX\x00"
get rax->RESERVED1_ long
get rax->RESERVED2_ long
get rax->entcount long

math i = 0

for OFFSET = 0x10 < DAT_SIZE
    getdstring query->sig 4
    get        query->blksize long
    get        query->fnamelen long
    get        query->usize long

    math i += 1

    if query->fnamelen > 0x100
        print "(%myname% at OFFSET=%OFFSET%) entry filename overly long, maybe bad value [query->fnamelen=%query->fnamelen%]"
        cleanexit
    endif
    if query->fnamelen > 0
        getdstring query->fname query->fnamelen
    else
        string query->fname p= "--%03d--.bin" i
    endif

    set        query->zsize query->blksize
    math query->zsize -= 0x10
    math query->zsize -= query->fnamelen

    savepos tmpOFFSET
    get magic long
    goto tmpOFFSET
   
    string dumpext = ".slz"
    if magic u!= 0x53535A4C # LZSS
        string dumpext = ".raw"
    endif

    set fname query->fname
    string fname R= "/" "!"
    string fname R= "\\" "!"

    get NAME basename
    string NAME p= "%s# [%s]%s" NAME fname dumpext
   
    if magic u== 0x53535A4C # LZSS
        log NAME tmpOFFSET query->zsize
    else
        log NAME tmpOFFSET query->usize
    endif

    goto query->zsize 0 SEEK_CUR

    savepos OFFSET
next

if i != rax->entcount
    print "(%myname%) Expected %rax->entcount% entries, found %i%"
endif

BMS scripts has build in import mode:

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://github.com/LittleBigBug/QuickBMS&ved=2ahUKEwiQhYqStsWEAxVSQvEDHTcJB14QFnoECBEQAQ&usg=AOvVaw0QGzMRz4KNxRvN_Fr6OgON