x86asm 0.1.0

A crate for assembling and disassembling x86 instructions.
Documentation 
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mod addressing16;
mod addressing32;
mod addressing64;
mod decode;
mod encode;
mod size_inference;
mod instruction_tests;

use std::io::Cursor;
use ::*;
use ::instruction::{Instruction};

fn decode_helper(bytes: &Vec<u8>, mode: Mode, expected: &Instruction) {
    println!("decode_helper ({:?}): {:?}\n", mode, expected);
    let buffer = Cursor::new(bytes);
    let mut reader = InstructionReader::new(buffer, mode);
    assert_eq!(reader.read().expect("Decoding failed"), *expected);
}

fn encode16_helper(instr: &Instruction, expected: &Vec<u8>) {
    let mut buffer = Cursor::new(Vec::new());
    instr.encode(&mut buffer, Mode::Real).expect("Encoding failed");
    assert_eq!(buffer.get_ref(), expected);
}

fn encode16_helper2(mnemonic: Mnemonic, operand1: Operand, operand2: Operand, expected: &Vec<u8>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand1: Some(operand1),
        operand2: Some(operand2),
        operand3: None,
        operand4: None,
        ..Default::default()
    };
    encode16_helper(&instr, expected);
}

fn encode32_helper(instr: &Instruction, expected: &Vec<u8>) {
    let mut buffer = Cursor::new(Vec::new());
    instr.encode(&mut buffer, Mode::Protected).expect("Encoding failed");
    assert_eq!(buffer.get_ref(), expected);
}

#[allow(dead_code)]
fn encode32_helper0(mnemonic: Mnemonic, expected: &Vec<u8>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand2: None,
        operand3: None,
        operand4: None,
        operand1: None,
        ..Default::default()
    };
    encode32_helper(&instr, expected);
}

#[allow(dead_code)]
fn encode32_helper1(mnemonic: Mnemonic, op1: Operand, expected: &Vec<u8>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand1: Some(op1),
        operand2: None,
        operand3: None,
        operand4: None,
        ..Default::default()
    };
    encode32_helper(&instr, expected);
}
fn encode32_helper2(mnemonic: Mnemonic, operand1: Operand, operand2: Operand, expected: &Vec<u8>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand1: Some(operand1),
        operand2: Some(operand2),
        operand3: None,
        operand4: None,
        ..Default::default()
    };
    encode32_helper(&instr, expected);
}

fn encode32_helper3(mnemonic: Mnemonic, operand1: Operand, operand2: Operand, operand3: Operand, expected: &Vec<u8>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand1: Some(operand1),
        operand2: Some(operand2),
        operand3: Some(operand3),
        operand4: None,
        ..Default::default()
    };
    encode32_helper(&instr, expected);
}

fn encode32_assert_ambiguous(mnemonic: Mnemonic, operand1: Option<Operand>, operand2: Option<Operand>, operand3: Option<Operand>, operand4: Option<Operand>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand1: operand1,
        operand2: operand2,
        operand3: operand3,
        operand4: operand4,
        ..Default::default()
    };
    let mut buffer = Cursor::new(Vec::new());
    assert_eq!(instr.encode(&mut buffer, Mode::Protected).err(), Some(InstructionEncodingError::AmbiguousSize));
}

fn encode64_helper(instr: &Instruction, expected: &Vec<u8>) {
    let mut buffer = Cursor::new(Vec::new());
    instr.encode(&mut buffer, Mode::Long).expect("Encoding failed");
    assert_eq!(buffer.get_ref(), expected);
}

fn encode64_helper2(mnemonic: Mnemonic, operand1: Operand, operand2: Operand, expected: &Vec<u8>) {
    let instr = Instruction {
        mnemonic: mnemonic,
        operand1: Some(operand1),
        operand2: Some(operand2),
        operand3: None,
        operand4: None,
        ..Default::default()
    };
    encode64_helper(&instr, expected);
}

fn run_test(instr: &Instruction, expected: &[u8], addr_size: OperandSize) {
    let mut buffer = Cursor::new(Vec::new());
    instr.encode(&mut buffer, Mode::from_size(addr_size).unwrap()).expect("Encoding failed");
    if &buffer.get_ref()[..] != expected {
        println!("Test failed.");
        print!("Output:   [");
        output_hex_array(buffer.get_ref());
        println!("]");
        print!("Expected: [");
        output_hex_array(expected);
        println!("]");
        panic!("Failure. Mode: {:?}.\nInstruction: {:?}.\n", addr_size, instr); 
    }
}

fn output_hex_array(data: &[u8]) {
    for i in 0..data.len() {
        print!("{:02X}", data[i]);
        if i != data.len() - 1 {
           print!(", "); 
        }
    }
}