@Override
	public byte[] read(byte[] buf) throws EmuIOException {
		if (input == null) {
			return arithmetic.fromConst(0, offsetBytes);
		}
		try {
			int result = input.read(buf);
			return arithmetic.fromConst(result, offsetBytes);
		}
		catch (IOException e) {
			throw new EmuIOException("Could not read host input stream", e);
		}
	}
Construct a proxy for a host resource

<p>
<b>WARNING:</b> Think carefully before proxying any host resource to a temperamental target
program.

@param machine the machine emulating the hardware
@param cSpec the ABI of the target platform
@param input the stream representing the input side of the descriptor, if applicable
@param output the stream representing the output side of the descriptor, if applicable
Ghidra/Features/SystemEmulation/src/main/java/ghidra/pcode/emu/unix/IOStreamEmuUnixFileHandle.java