luckily an easy job :)
Code:
comtype gzip
endian big
idstring FArC
get LIMIT long
get DUMMY long
for CURR_OFF = 0xc < LIMIT
    get NAME string
    get OFFSET long
    get ZSIZE long
    get SIZE long
    if SIZE == ZSIZE
        log NAME OFFSET SIZE
    else
        endian little   # for gzip
        clog NAME OFFSET ZSIZE SIZE
        endian big
    endif
    savepos CURR_OFF
next