粘包问题处理（切片）

最新推荐文章于 2021-10-05 17:53:34 发布

fang8380

最新推荐文章于 2021-10-05 17:53:34 发布

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分类专栏： ios开发sockett 文章标签：数据

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本文介绍了一种基于TCP的粘包处理方法，通过自定义的数据包头来解析接收到的数据流，确保数据包的完整性和准确性。

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#pragma mark 粘包处理
-(void)stickPackage:(NSData *)recPackage sock:(GCDAsyncSocket *)sock retBlock:(void (^)(NSData *_recData,NSError *err))retBlock{
int len = 0;
if(info==NULL ||sizeof(info)==0){
DLog(@"===============NULL==========");
unsigned char *pt=(unsigned char *)calloc(1, sizeof(PeerInfo));
info=(PeerInfo *)pt;
}
TCPHeader *head = (TCPHeader*)info->pkt;
//unsigned char *pro = info->pkt + kInnerPacketHeadSize;
const char *src = (const char *)[recPackage bytes];
int srclen = [recPackage length];
while(srclen > 0)
{
if(info->writepos < kInnerPacketHeadSize)
{
len = kInnerPacketHeadSize - info->writepos;
if(srclen < len)
len = srclen;
memcpy(info->pkt + info->writepos, src, len);
info->writepos += len;
src += len;
srclen -= len;
}
if(srclen <= 0) //当前调用已经没有足够的数据了
break;
if(info->writepos >= kInnerPacketHeadSize)
{
if(head->dwSignature1 != DWORD_SIGNATURE1 || head->dwSignature2 != DWORD_SIGNATURE2)
{
info->writepos = 0;
DLog(@"签名错误 dwSignature1:%i DWORD_SIGNATURE2:%i 原始签名DWORD_SIGNATURE1:%i 原始签名DWORD_SIGNATURE2:%i",head->dwSignature1,head->dwSignature2,DWORD_SIGNATURE1,DWORD_SIGNATURE2);
return;
}
}
if(info->writepos < kMaxBufferSize) //数据还可以继续拷贝
{
len = kMaxBufferSize - info->writepos;
if(srclen < len)
len = srclen;
if(len + info->writepos > kInnerPacketHeadSize + head->dwLenght)
len = kInnerPacketHeadSize + head->dwLenght - info->writepos;
memcpy(info->pkt + info->writepos, src, len);
info->writepos += len;
src += len;
srclen -= len;
}
if(info->writepos == kInnerPacketHeadSize + head->dwLenght) //数据包已经收齐
{
HYPacketHead *p=(HYPacketHead *)info->pkt;
DLog(@"收到命令cmd:%i ",p->cmd);
//AddToProcessList(cc, info);
if(retBlock){
if(info==NULL||sizeof(info)==0){
DLog(@"info memeroy is null");
}else{
DLog(@"info memeroy is not null");
}

DLog(@"head->dwlength:%i ",head->dwLenght);
NSData *pkg=[NSData dataWithBytes:info length:kInnerPacketHeadSize + head->dwLenght];
NSData *data=[pkg subdataWithRange:NSMakeRange(kInnerPacketHeadSize,head->dwLenght)];
retBlock(data,nil);
}

info->writepos = 0; //开始处理新的一包数据
}
if(srclen <= 0)
break;
if(info->writepos >= kMaxBufferSize) //缓冲区不够了，不再拷贝
{
len = srclen;
if(len + info->writepos > kInnerPacketHeadSize + head->dwLenght)
len = kInnerPacketHeadSize + head->dwLenght - info->writepos;
info->writepos += len;
src += len;
srclen -= len;
}
if(info->writepos == kInnerPacketHeadSize + head->dwLenght) //数据包已经收齐
{
// AddToProcessList(cc, info);
HYPacketHead *p=(HYPacketHead *)info->pkt;
DLog(@"收到命令cmd:%i ",p->cmd);
if(retBlock){
NSData *pkg=[NSData dataWithBytes:info length:kInnerPacketHeadSize + head->dwLenght];
NSData *data=[pkg subdataWithRange:NSMakeRange(kInnerPacketHeadSize,head->dwLenght)];
retBlock(data,nil);
}
info->writepos = 0; //开始处理新的一包数据
}
}
if(info->writepos == kInnerPacketHeadSize + head->dwLenght) //数据包已经收齐
{
HYPacketHead *p=(HYPacketHead *)info->pkt;
DLog(@"收到命令cmd:%i ",p->cmd);
//AddToProcessList(cc, info);
if(retBlock){
NSData *pkg=[NSData dataWithBytes:info length:kInnerPacketHeadSize + head->dwLenght];
NSData *data=[pkg subdataWithRange:NSMakeRange(kInnerPacketHeadSize,head->dwLenght)];
retBlock(data,nil);
}
info->writepos = 0; //开始处理
}
}