1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

extern crate byteorder;

use byteorder::{BigEndian, ReadBytesExt};
use std::io::prelude::*;
/*
pub enum Endians {
    BigEndian,
    LittleEndian,
    NativeEndian
}
*/

pub struct BinaryReader {
    data: Vec<u8>,
    pos: usize,
    length: usize,
    //endian: Endians
}

impl BinaryReader {
    fn initialize() -> BinaryReader {
        BinaryReader {
            data: Vec::new(),
            pos: 0,
            length: 0
        }
    }

    pub fn from_u8(get: &[u8]) -> BinaryReader {
        let mut a = BinaryReader::initialize();
        a.data = get.to_vec();
        a.length = get.len();
        a
    }

    pub fn from_vec(vec: &Vec<u8>) -> BinaryReader {
        let mut a = BinaryReader::initialize();
        a.data = vec.to_vec();
        a.length = vec.len();
        a
    }

    pub fn from_file(file: &mut std::fs::File) -> BinaryReader {
        let mut a = BinaryReader::initialize();
        let mut v: Vec<u8> = Vec::new();
        a.length = file.read_to_end(&mut v).unwrap();
        a.data = v;
        a
    }

    pub fn jmp(&mut self, pos: usize) {
        self.pos = pos
    }

    pub fn adv(&mut self, size: usize) {
        self.pos += size
    }

    pub fn align(&mut self, size: usize) {
        self.pos = (self.pos + size - 1) / size * size
    }

    pub fn read(&mut self, size: usize) -> Option<&[u8]> {
        let data = self.data.get(self.pos..self.pos + size);
        self.pos += size;
        data
    }

    pub fn cstr(&mut self) -> String { // "abc" "null" "def"
        let mut data = self.data.get(self.pos..self.length).unwrap().to_vec();
        data.reverse();
        let mut vec: Vec<u8> = Vec::new();
        loop {
            let a = data.pop().unwrap();
            if a == 0u8 { self.pos += vec.len(); return String::from_utf8(vec).unwrap() }
            vec.push(a);
        }
    }

    pub fn i8(&mut self) -> i8 {
        let mut data = self.data.get(self.pos..self.pos + 1).unwrap();
        self.pos += 1;
        data.read_i8().unwrap()
    }

    pub fn i16(&mut self) -> i16 {
        let mut data = self.data.get(self.pos..self.pos + 2).unwrap();
        self.pos += 2;
        data.read_i16::<BigEndian>().unwrap()
    }

    pub fn i32(&mut self) -> i32 {
        let mut data = self.data.get(self.pos..self.pos + 4).unwrap();
        self.pos += 4;
        data.read_i32::<BigEndian>().unwrap()
    }

    pub fn i64(&mut self) -> i64 {
        let mut data = self.data.get(self.pos..self.pos + 8).unwrap();
        self.pos += 8;
        data.read_i64::<BigEndian>().unwrap()
    }

    pub fn u8(&mut self) -> u8 {
        let mut data = self.data.get(self.pos..self.pos + 1).unwrap();
        self.pos += 1;
        data.read_u8().unwrap()
    }

    pub fn u16(&mut self) -> u16 {
        let mut data = self.data.get(self.pos..self.pos + 2).unwrap();
        self.pos += 2;
        data.read_u16::<BigEndian>().unwrap()
    }

    pub fn u32(&mut self) -> u32 {
        let mut data = self.data.get(self.pos..self.pos + 4).unwrap();
        self.pos += 4;
        data.read_u32::<BigEndian>().unwrap()
    }

    pub fn u64(&mut self) -> u64 {
        let mut data = self.data.get(self.pos..self.pos + 8).unwrap();
        self.pos += 8;
        data.read_u64::<BigEndian>().unwrap()
    }
}


#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}