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//
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// BLIPReader.m
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// MYNetwork
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//
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// Created by Jens Alfke on 5/10/08.
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// Copyright 2008 Jens Alfke. All rights reserved.
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//
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#import "BLIPReader.h"
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#import "BLIP_Internal.h"
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#import "BLIPWriter.h"
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#import "BLIPDispatcher.h"
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#import "Logging.h"
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#import "Test.h"
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#import "CollectionUtils.h"
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@interface BLIPReader ()
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- (BOOL) _receivedFrameWithHeader: (const BLIPFrameHeader*)header body: (NSData*)body;
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@end
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@implementation BLIPReader
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#define _blipConn ((BLIPConnection*)_conn)
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- (id) initWithConnection: (BLIPConnection*)conn stream: (NSStream*)stream
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{
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self = [super initWithConnection: conn stream: stream];
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if (self != nil) {
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_pendingRequests = [[NSMutableDictionary alloc] init];
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_pendingResponses = [[NSMutableDictionary alloc] init];
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}
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return self;
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}
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- (void) dealloc
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{
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[_pendingRequests release];
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[_pendingResponses release];
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[_curBody release];
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[super dealloc];
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}
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- (void) disconnect
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{
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for( BLIPResponse *response in [_pendingResponses allValues] ) {
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[response _connectionClosed];
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[_conn tellDelegate: @selector(connection:receivedResponse:) withObject: response];
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}
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setObj(&_pendingResponses,nil);
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[super disconnect];
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}
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#pragma mark -
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#pragma mark READING FRAMES:
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- (NSString*) _validateHeader
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{
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// Convert header to native byte order:
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_curHeader.magic = NSSwapBigIntToHost(_curHeader.magic);
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_curHeader.number= NSSwapBigIntToHost(_curHeader.number);
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_curHeader.flags = NSSwapBigShortToHost(_curHeader.flags);
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_curHeader.size = NSSwapBigShortToHost(_curHeader.size);
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if( _curHeader.magic != kBLIPFrameHeaderMagicNumber )
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return $sprintf(@"Incorrect magic number (%08X not %08X)",
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_curHeader.magic,kBLIPFrameHeaderMagicNumber);
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size_t bodyLength = _curHeader.size;
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if( bodyLength < sizeof(BLIPFrameHeader) )
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return @"Length is impossibly short";
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bodyLength -= sizeof(BLIPFrameHeader);
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_curBody = [[NSMutableData alloc] initWithLength: bodyLength];
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return nil;
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}
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- (void) _endCurFrame
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{
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[self retain];
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[self _receivedFrameWithHeader: &_curHeader body: _curBody];
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memset(&_curHeader,0,sizeof(_curHeader));
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setObj(&_curBody,nil);
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_curBytesRead = 0;
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[self release];
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}
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- (BOOL) isBusy
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{
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return _curBytesRead > 0;
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}
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- (void) _canRead
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{
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SInt32 headerLeft = sizeof(BLIPFrameHeader) - _curBytesRead;
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if( headerLeft > 0 ) {
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// Read (more of) the header:
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NSInteger bytesRead = [self read: (uint8_t*)&_curHeader +_curBytesRead
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maxLength: headerLeft];
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if( bytesRead > 0 ) {
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_curBytesRead += bytesRead;
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if( _curBytesRead < sizeof(BLIPFrameHeader) ) {
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// Incomplete header:
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LogTo(BLIPVerbose,@"%@ read %u bytes of header (%u left)",
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self,bytesRead,sizeof(BLIPFrameHeader)-_curBytesRead);
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} else {
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// Finished reading the header!
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headerLeft = 0;
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NSString *err = [self _validateHeader];
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if( err ) {
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Warn(@"%@ read bogus frame header: %@",self,err);
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return (void)[self _gotError: BLIPMakeError(kBLIPError_BadData, @"%@", err)];
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}
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LogTo(BLIPVerbose,@"%@: Read header; next is %u-byte body",self,_curBody.length);
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if( _curBody.length == 0 ) {
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// Zero-byte body, so no need to wait for another read
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[self _endCurFrame];
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}
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}
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}
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} else {
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// Read (more of) the current frame's body:
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SInt32 bodyRemaining = (SInt32)_curBody.length + headerLeft;
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if( bodyRemaining > 0 ) {
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uint8_t *dst = _curBody.mutableBytes;
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dst += _curBody.length - bodyRemaining;
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NSInteger bytesRead = [self read: dst maxLength: bodyRemaining];
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if( bytesRead > 0 ) {
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_curBytesRead += bytesRead;
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bodyRemaining -= bytesRead;
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LogTo(BLIPVerbose,@"%@: Read %u bytes of frame body (%u left)",self,bytesRead,bodyRemaining);
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}
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}
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if( bodyRemaining==0 ) {
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// Done reading this frame: give it to the Connection and reset my state
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[self _endCurFrame];
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}
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}
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}
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#pragma mark -
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#pragma mark PROCESSING FRAMES:
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- (void) _addPendingResponse: (BLIPResponse*)response
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{
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[_pendingResponses setObject: response forKey: $object(response.number)];
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}
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- (BOOL) _receivedFrameWithHeader: (const BLIPFrameHeader*)header body: (NSData*)body
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{
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static const char* kTypeStrs[16] = {"MSG","RPY","ERR","3??","4??","5??","6??","7??"};
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BLIPMessageType type = header->flags & kBLIP_TypeMask;
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LogTo(BLIPVerbose,@"%@ rcvd frame of %s #%u, length %u",self,kTypeStrs[type],header->number,body.length);
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id key = $object(header->number);
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BOOL complete = ! (header->flags & kBLIP_MoreComing);
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switch(type) {
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case kBLIP_MSG: {
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// Incoming request:
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BLIPRequest *request = [_pendingRequests objectForKey: key];
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if( request ) {
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// Continuation frame of a request:
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if( complete ) {
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[[request retain] autorelease];
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[_pendingRequests removeObjectForKey: key];
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}
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} else if( header->number == _numRequestsReceived+1 ) {
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// Next new request:
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request = [[[BLIPRequest alloc] _initWithConnection: _blipConn
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isMine: NO
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flags: header->flags | kBLIP_MoreComing
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number: header->number
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body: nil]
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autorelease];
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if( ! complete )
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[_pendingRequests setObject: request forKey: key];
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_numRequestsReceived++;
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} else
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return [self _gotError: BLIPMakeError(kBLIPError_BadFrame,
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@"Received bad request frame #%u (next is #%u)",
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header->number,_numRequestsReceived+1)];
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if( ! [request _receivedFrameWithHeader: header body: body] )
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return [self _gotError: BLIPMakeError(kBLIPError_BadFrame,
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@"Couldn't parse message frame")];
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if( complete )
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[_blipConn _dispatchRequest: request];
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break;
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}
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case kBLIP_RPY:
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case kBLIP_ERR: {
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BLIPResponse *response = [_pendingResponses objectForKey: key];
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if( response ) {
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if( complete ) {
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[[response retain] autorelease];
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[_pendingResponses removeObjectForKey: key];
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}
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if( ! [response _receivedFrameWithHeader: header body: body] ) {
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return [self _gotError: BLIPMakeError(kBLIPError_BadFrame,
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@"Couldn't parse response frame")];
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} else if( complete )
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[_blipConn _dispatchResponse: response];
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} else {
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if( header->number <= ((BLIPWriter*)self.writer).numRequestsSent )
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LogTo(BLIP,@"??? %@ got unexpected response frame to my msg #%u",
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self,header->number); //benign
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else
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return [self _gotError: BLIPMakeError(kBLIPError_BadFrame,
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@"Bogus message number %u in response",
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header->number)];
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}
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break;
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}
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default:
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// To leave room for future expansion, undefined message types are just ignored.
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Log(@"??? %@ received header with unknown message type %i", self,type);
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break;
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}
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return YES;
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}
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@end
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/*
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Copyright (c) 2008, Jens Alfke <jens@mooseyard.com>. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted
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provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list of conditions
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and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this list of conditions
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and the following disclaimer in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
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BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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