How to copy binary data from one stream to another?

Question

Currently i have a program that loads binary data into a stringstream and then pases the data to a fstream like so:

stringstream ss(stringstream::binary | stringstream::in | stringstream::out);
ss.write(data, 512);  // Loads data into stream

// Uses a memory block to pass the data between the streams
char* memBlock = new char[512];
ss.read(memBlock, 512);

ofstream fout("someFile.bin", ios::binary);
fout.write(memBlock, 512);  // Writes the data to a file
fout.close();

delete[] memBlock;

My question is: is there a better way to pass the binary data between the streams?

Solution

Use the streambuf members, that's what they are for:

fout << ss.rdbuf();

Comments

[Fabi1816]

Isn´t "operator<<" for formated input? i´m working with binary data.

[Alexandre C.]

@Fabi1816: There is an overload for streambuf which does binary output. This overload is here to do exactly what you request here.

[Stephen]

This is functionally correct. I've found copying data with C++ streams to be 2-3 times slower than using the C style methods posted above. Much to my annoyance.

[StanE]

Also, the entire stream is copied. Sometimes one needs to copy data from a certain offset and/or a certain amount of bytes only.