Having written a Haskell LDAP interface, this is something that worried me but I never got to the bottom of. I've cross-posted this to haskell (hopefully the right place). There was some discussion of replacing Char by a type for raw bytes / octets but I'm not sure what happened to it.
Dominic. "Warrick Gray" <[EMAIL PROTECTED]>@haskell.org on 07/04/2002 13:31:41 Sent by: [EMAIL PROTECTED] To: libraries cc: bcc: Subject: String type in Socket I/O Hi all, I am writing an HTTP client-side library, using the SocketPrim library. During the implementation of Base64 encode/decode I began to have some doubts over the use of the Char type for socket I/O. As far as I can tell, "sendTo" and "recvFrom" are simply handles on the underlying OS calls. My winsock2.h file tells me the data passed into and received from these functions are C style chars, 8 bits each. In unix these functions (sys/sockets.h) appear to use a C void pointer. Finally I notice that the Haskell98 report defines Haskell Char as a Unicode char (which I figure isn't guaranteed 8 bits). So I am curious, what happens when I send these unicode Haskell chars to the SocketPrim.sendTo function? My current guess is that the low 8 bits of each Char become a C style char. My base64 encoding and decoding functions sort of make this assumption, by ripping out the low 8 bits of chars before encoding this binary representation (3x8bit chars become 4x6bit base64 chars). So far everything works fine, but is this approach going to break in the near future? What I would like to see are socket functions that do not introduce this extra level of binary indirection, perhaps using a ByteArray, or Word8 (as I see has previously been discussed - http://www.haskell.org/pipermail/libraries/2001-August/000482.html). How realistic is this? Warrick. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp. _______________________________________________ Libraries mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/libraries ------------------------------------------------------------------------------------------------- Save time by using an eTicket and our Self-Service Check-in Kiosks. For more information go to http://www.britishairways.com/eservice1 _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
