gistfile1.txt

function makeRecvPacket()
   buf, len = nextPacketBuf()
   if buf == nil then
      return false
   end
   log("received")
   if len ~= maxpacketlen then
      log("packet len "..tostring(len))
   end
   packet = {}
   local i = 0
   packet.version = getb(buf, 'uint8_t', i)
   log('v '..tostring(packet.version))
   assert(packet.version == 1)
   i = i + versionsize
   local filenamelen = getb(buf, 'uint16_t', i)
   i = i + filenamelensize
   log(filenamelen)
   local contentlen = getb(buf, 'uint32_t', i)
   log(contentlen)
   assert(contentlen + headerlen + filenamelen <= maxpacketlen)
   i = i + contentlensize
   packet.from = getb(buf, 'uint32_t', i)
   log(packet.from)
   i = i + fromsize
   packet.seq = getb(buf, 'uint32_t', i) -- ffi.new('uint32_t[?]', 1, buf[i])[0]
   log(packet.seq)
   i = i + seqsize
   packet.filename = ffi.string(buf + i, filenamelen)
   log(packet.filename)
   i = i + filenamelen
   packet.content = ffi.string(buf + i, contentlen)
   log(#packet.content)
   -- sanity checks
   assert(packet.version == 1)
   assert(#packet.content <= maxpacketlen - headerlen - 1)
   return true, packet
end