jens@0: //
jens@0: //  BLIP_Internal.h
jens@0: //  MYNetwork
jens@0: //
jens@0: //  Created by Jens Alfke on 5/10/08.
jens@0: //  Copyright 2008 Jens Alfke. All rights reserved.
jens@0: //
jens@0: 
jens@0: #import "BLIPConnection.h"
jens@0: #import "BLIPRequest.h"
jens@0: #import "BLIPProperties.h"
jens@0: @class BLIPWriter;
jens@0: 
jens@0: 
jens@0: /* Private declarations and APIs for BLIP implementation. Not for use by clients! */
jens@0: 
jens@0: 
jens@0: /* BLIP message types; encoded in each frame's header. */
jens@0: typedef enum {
jens@0:     kBLIP_MSG,                      // initiating message
jens@0:     kBLIP_RPY,                      // response to a MSG
jens@0:     kBLIP_ERR                       // error response to a MSG
jens@0: } BLIPMessageType;
jens@0: 
jens@0: /* Flag bits in a BLIP frame header */
jens@0: enum {
jens@0:     kBLIP_TypeMask  = 0x000F,       // bits reserved for storing message type
jens@0:     kBLIP_Compressed= 0x0010,       // data is gzipped
jens@0:     kBLIP_Urgent    = 0x0020,       // please send sooner/faster
jens@0:     kBLIP_NoReply   = 0x0040,       // no RPY needed
jens@0:     kBLIP_MoreComing= 0x0080,       // More frames coming (Applies only to individual frame)
jens@18:     kBLIP_Meta      = 0x0100,       // Special message type, handled internally (hello, bye, ...)
jens@0: };
jens@0: typedef UInt16 BLIPMessageFlags;
jens@0: 
jens@0: 
jens@0: /** Header of a BLIP frame as sent across the wire. All fields are big-endian. */
jens@0: typedef struct {
jens@0:     UInt32           magic;         // magic number (kBLIPFrameHeaderMagicNumber)
jens@0:     UInt32           number;        // serial number of MSG
jens@0:     BLIPMessageFlags flags;         // encodes frame type, "more" flag, and other delivery options
jens@0:     UInt16           size;          // total size of frame, _including_ this header
jens@0: } BLIPFrameHeader;
jens@0: 
jens@19: #define kBLIPFrameHeaderMagicNumber 0x9B34F206
jens@0: 
jens@18: #define kBLIPProfile_Hi  @"Hi"      // Used for Profile header in meta greeting message
jens@18: #define kBLIPProfile_Bye @"Bye"     // Used for Profile header in meta close-request message
jens@18: 
jens@0: 
jens@0: @interface BLIPConnection ()
jens@0: - (void) _dispatchRequest: (BLIPRequest*)request;
jens@0: - (void) _dispatchResponse: (BLIPResponse*)response;
jens@0: @end
jens@0: 
jens@0: 
jens@0: @interface BLIPMessage ()
jens@0: @property BOOL sent, propertiesAvailable, complete;
jens@18: - (BLIPMessageFlags) _flags;
jens@0: - (void) _setFlag: (BLIPMessageFlags)flag value: (BOOL)value;
jens@0: - (void) _encode;
jens@0: @end
jens@0: 
jens@0: 
jens@0: @interface BLIPMessage ()
jens@0: - (id) _initWithConnection: (BLIPConnection*)connection
jens@0:                     isMine: (BOOL)isMine
jens@0:                      flags: (BLIPMessageFlags)flags
jens@0:                     number: (UInt32)msgNo
jens@0:                       body: (NSData*)body;
jens@0: - (BOOL) _writeFrameTo: (BLIPWriter*)writer maxSize: (UInt16)maxSize;
jens@0: @property (readonly) SInt32 _bytesWritten;
jens@0: - (void) _assignedNumber: (UInt32)number;
jens@0: - (BOOL) _receivedFrameWithHeader: (const BLIPFrameHeader*)header body: (NSData*)body;
jens@0: - (void) _connectionClosed;
jens@0: @end
jens@0: 
jens@0: 
jens@0: @interface BLIPRequest ()
jens@0: - (id) _initWithConnection: (BLIPConnection*)connection
jens@0:                       body: (NSData*)body 
jens@0:                 properties: (NSDictionary*)properties;
jens@0: @end
jens@0: 
jens@0: 
jens@0: @interface BLIPResponse ()
jens@0: - (id) _initWithRequest: (BLIPRequest*)request;
jens@0: @end