goim socket丢包粘包问题解决。

-(NSInteger)bytesToInt:(unsigned char*) data

{

return (data[3]&255)|(data[2]&255)<<8|(data[1]&255)<<16|(data[0]&255)<<24;

}

-(NSInteger)parseDataLength:(NSData*)headerData

{

unsigned char messageLength[4];

[headerData getBytes:messageLength range:NSMakeRange(0, 4)];

NSInteger messageDataLength = [self bytesToInt:messageLength];

return messageDataLength;

}

//socket连接后收到数据

- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)socketData withTag:(long)tag

{

NSLog(@"socket连接后收到数据------------------------------------");

switch (tag)

{

case TAG_PACKAGE_HEADER:

{

NSInteger messageDataLength = [self parseDataLength:socketData];

if (messageDataLength == 0)

{

[_asyncSocket readDataToLength:TAG_PACKAGE_HEADER_LENGTH withTimeout:-1 tag:TAG_PACKAGE_HEADER];

}

else

{

[_asyncSocket readDataToLength:messageDataLength-4 withTimeout:-1 tag:TAG_PACKAGE_BODY];

}

break;

}

case TAG_PACKAGE_BODY:

{

[self parseSocketBodyData:socketData];

[_asyncSocket readDataToLength:TAG_PACKAGE_HEADER_LENGTH withTimeout:-1 tag:TAG_PACKAGE_HEADER];

break;

}

default:

//            [_asyncSocket readDataToLength:TAG_PACKAGE_HEADER_LENGTH withTimeout:-1 tag:TAG_PACKAGE_HEADER];

break;

}

return;

}

-(void)parseSocketBodyData:(NSData *)socketData

{

//从服务器发送的数据中减去前16字节的格式协议

NSInteger dataLength = socketData.length;

NSLog(@"data length = %ld", dataLength);

Byte *inBuffer = malloc(MAX_BUFFER);

inBuffer = (Byte *)[socketData bytes];

BruteForceCoding *brute = [[BruteForceCoding alloc]init];

Byte *resultByte = [brute tail:inBuffer anddataLengthLength:dataLength andHeaderLength:12];

//解析指令，不同指令执行不同的操作

NSInteger operation = [brute decodeIntBigEndian:inBuffer offset:4 size:4];

//解析出body内容

NSData *data = [NSData dataWithBytes:resultByte length:dataLength - 12];

NSString *string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

NSDictionary *rspDic = [self dictionaryWithJsonString:string];

}