goim socket丢包粘包问题解决。
2016-12-14 16:44 xiangjune 阅读(1022) 评论(0) 编辑 收藏 举报
-(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];
}
