CODEWITHSUNDEEP
pythonsocketszlib
supersuraccoon
supersuraccoon

Reputation: 1681

send data from zlib.compress in python over socket

I am trying to translate some c++ codes to python which send some data to a java server.

The origin c++ code is as follow :

std::string msgstr = "";
msg.SerializeToString(&msgstr);

auto allocSize = msgstr.size() + 1024;
char* data = (char*)malloc(allocSize);

uLong gzlen = msgstr.size() + 1024;

Bytef*pCompressData = (Bytef*)malloc(gzlen);
auto result = CGameZipUtils::gzcompress(/**/);

if(result == 0) {
    int tmp;
    tmp = htonl((int)gzlen);
    memcpy(&data[0], &tmp, 4);
    memcpy(&data[4], pCompressData, gzlen);

    sendData(data,(int)gzlen + 4);
}

Now I used the zlib and socket package in python and so far I seem to have the compress part working because the output of the data length in python now is as same as in C++:

msgstr = msg.SerializeToString()
print "msgstr: %s" % len(msgstr)

gzlen = len(msgstr) + 1024

compressor = zlib.compressobj(-1, zlib.DEFLATED, 31, 8, zlib.Z_DEFAULT_STRATEGY)

pCompressData = compressor.compress(msgstr)
pCompressData += compressor.flush()

gzlen = len(pCompressData)
print "gzlen: %s" % gzlen

tmp = socket.htonl(gzlen)
print "tmp: %s" % tmp

The problem I am having now is that I do not know how to send the data I get from zlib.compress and add a head with data length to it then send the data to my server.

I need to figured out how to write the data to send :

send = "??????"

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect((GATE_ADDRESS, GATE_PORT))
client_socket.send(data)
client_socket.close()

Any advice will be appreciated, thanks :)

Upvotes: 0

Views: 691

Answers (1)

supersuraccoon
supersuraccoon

Reputation: 1681

Find out the solution my self finally:

data = struct.pack('i', tmp)
//...
client_socket.send(data + pCompressData)

Upvotes: 1

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