//这个函数的特点是可以指定输入数据的长度，注意，input的有效数据长度必须是16的整数倍，input的大小必须大于等于len。
//但是outbuf仅仅存储，有效的输出长度。
int Aes::DecryptEcb(Memory<char>& outbuf,const void* input,int len){
if(len<=0) return 0;
if(outbuf.Length()<(uint)len){
if(!outbuf.SetLength(len)) return 0;
}
return DecryptEcb(outbuf.Handle(),len,input,len);
}
//返回值是加密数据的长度，outbuf会自动设置大小，但是不一定是数据长度，可能大于它。
int Aes::EncryptEcb(Memory<char>& outbuf,const void* input,int len){
if(len<=0) return 0;
int lastn = len&0xF;
int outLen;
if(lastn) outLen = len - lastn + 16;
else outLen = len;
if(outbuf.Length()<(uint)outLen){
if(!outbuf.SetLength(outLen)) return 0;
}
return EncryptEcb(outbuf.Handle(),outLen,input,len);
}
int Image::Save(Memory<char>& mem,LPCWSTR type,long quality){
if(_image==0) return 0;
CLSID clsid;
//未知原因，如果不用一个变量转换一下，type是一个常量字串的话，如果把 type 直接传给 GetImageEncoderClsid 会引起程序崩溃。
//wchar_t tp[256];
//这样也不行。
//cs::WcsCopy(tp,type);
cs::String tp = type;
if(!GetImageEncoderClsid(tp,&clsid)) return 0;
if(quality>100) quality = 100;
if(quality<0) quality = 0;
Gdiplus::EncoderParameters eps;
eps.Count = 1;
eps.Parameter[0].Guid = Gdiplus::EncoderQuality;
eps.Parameter[0].NumberOfValues = 1;
eps.Parameter[0].Type = Gdiplus::EncoderParameterValueTypeLong;
eps.Parameter[0].Value = &quality;
IStream* stream;
if(FAILED(CreateStreamOnHGlobal(0,1,&stream))) return 0;
if(((_Image*)_image)->Save(stream,&clsid,&eps)!=0) return 0;
ULONG ws = 0;
LARGE_INTEGER li;
ULARGE_INTEGER npos;
li.QuadPart = 0;
stream->Seek(li,STREAM_SEEK_END,&npos);
if(mem.Length()<npos.LowPart){
mem.SetUseSysMemory(1);
if(!mem.SetLength(npos.LowPart)) return 0;
}
stream->Seek(li,STREAM_SEEK_SET,0);
HRESULT ret = stream->Read(mem.Handle(),mem.Length(),&ws);
stream->Release();
if(FAILED(ret)) return 0;
return ws;
}
int HttpRequest::Request(const void* data,int len,Memory<char>& html,String* retHead){
if(!hRequest) return -1;
if(!::HttpSendRequest(hRequest,NULL,0,(LPVOID)data,len)) return -1;
DWORD dwSize = 0;
if(retHead){
HttpQueryInfo(hRequest,HTTP_QUERY_RAW_HEADERS_CRLF, NULL, &dwSize, NULL);
if(dwSize!=0){
retHead->SetCubage(dwSize/2);
if(HttpQueryInfo(hRequest, HTTP_QUERY_RAW_HEADERS_CRLF, (LPVOID)retHead->Handle(), &dwSize, NULL)){
//安全起见，实际上数据已经是一个NULL结尾的字串。
(*retHead)[dwSize/2-1] = 0;
retHead->Realize();
}
}
}
int offset = 0;
for(;;){
char szData[1024];
DWORD dwByteRead = 0;
::InternetReadFile(hRequest,szData,sizeof(szData),&dwByteRead);
if(!dwByteRead) break;
if(html.Length()<dwByteRead+offset+1){
if(!html.SetLength(dwByteRead+offset+1)){
Print(L"html alloc failed");
break;
}
}
html.CopyFrom(szData,dwByteRead,offset);
offset += dwByteRead;
}
if(offset!=0) html[offset] = 0;
::InternetCloseHandle(hConnect);
hConnect = 0;
::InternetCloseHandle(hRequest);
hRequest = 0;
return offset;
}