Hello Pupeno, Tuesday, December 27, 2005, 6:03:50 PM, you wrote:
you must use `openBitAligned` to open bit-aligned stream over Handle, and use `flushBits` at the end of writing. there is much more features, ask me about what you need P> Well, it seems I am seeing a bit of light here :) P> I have a couple of questions: P> - Is it possible to serialize from and to a Ptr ? Because TCP gives me a P> Handle, but UDP just gives me a Ptr with the packet and I'll turn the TCP P> into a Ptr as well.
reading: h <- openMemory ptr size bh <- openBitAligned h a <- get bh b <- get bh .... -- you don't need to close/flush/free resources at the end writing: h <- createMemoryStream 64 -- replace 64 with initial buffer size you need -- the buffer will be extended if more data -- will be written bh <- openBitAligned h put_ bh a put_ bh b ... flushBits bh but currently there is no way to get data from this buffer :) just see structure of SimpleMemoryStream (created by createMemoryStream) and extract these data yourself - something like: copyMemToHandle mem handle = do let (Mem buf' pos' end') = mem buf <- readPtr buf' pos <- readPtr pos' hPutBuf handle buf (pos-:buf) P> - Is it possible to serialize from and to a Ptr ? Because TCP gives me a P> Handle, but UDP just gives me a Ptr with the packet and I'll turn the TCP P> into a Ptr as well. btw, you don't need to "convert" anything, my library works with Handle and memory buffers in the same way. so just parse data directly from the original source P> - Is it possible to specify the endiannes ? I need to read everything as P> big-endian. my library works in network format which is what you used in ptrToWord16BE. if you need another format - you can either define and use new low-level functions: getWord16LE h = do w1 <- vGetByte h w2 <- vGetByte h return $! ((w2 `shiftL` 8) .|. w1) or define these functions and use them in defining instances of Binary class: instance Binary Word16 where put_ = putWord16LE get = getWord16LE instance Binary Word32 where put_ = putWord32LE get = getWord32LE .... and then just read Word16/Word32/... types. the second solution needs to edit Binary.hs -- Best regards, Bulat mailto:bulatz@HotPOP.com