gh-hex 0.0.0

A project to create more functional versions of existing hex tools
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

use crate::chrome::*;
use crate::print_error::*;
use std::fs::File;
use std::io;
use std::io::Read;
use std::io::Write;

pub fn main_hexdump(filename: &str, is_output_colored: bool) -> Result<(), String> {
    let b_arr_size: usize = 0x4000;
    let mut f = File::open(filename)
        .map_err(|e| format!("Cannot open {}\n\nCaused by:\n {}", filename, e))?;
    let chrome_instance = ChromeInstance::new(is_output_colored);
    let mut h = Hexdump::new(chrome_instance);
    let stdout = io::stdout();
    let mut stdout_locked = stdout.lock();
    loop {
        let mut b_arr = Vec::with_capacity(b_arr_size);
        let n = Read::by_ref(&mut f)
            .take(b_arr_size as u64)
            .read_to_end(&mut b_arr)
            .map_err(|e| format!("Cannot read from {}\n\nCaused by:\n {}", filename, e))?;
        if n == 0 {
            break;
        }
        let mut i = 16;
        while i <= n {
            h.process_bytes(&b_arr[i - 16..i], &mut stdout_locked);
            i += 16
        }
        if n - (i - 16) != 0 {
            h.process_bytes(&b_arr[(i - 16)..n], &mut stdout_locked);
        }

        if n < b_arr_size {
            break;
        }
    }

    pe(writeln!(
        stdout_locked,
        "+----------+-----------------------------------------+------------------+"
    ));
    Ok(())
}

struct Hexdump {
    byte_count: u64,
    space_req: bool,
    chrome_instance: ChromeInstance,
}

impl Hexdump {
    fn new(chrome_instance: ChromeInstance) -> Hexdump {
        pe(writeln!(
            io::stdout(),
            "+----------+-----------------------------------------+------------------+"
        ));
        pe(writeln!(
            io::stdout(),
            "| -offset- : 0 1  2 3  4 5  6 7  8 9  A B  C D  E F  | 0123456789ABCDEF |"
        ));
        pe(writeln!(
            io::stdout(),
            "+----------+-----------------------------------------+------------------+"
        ));
        Hexdump {
            byte_count: 0,
            space_req: false,
            chrome_instance,
        }
    }

    fn is_print(curr_byte: u8) -> bool {
        curr_byte >= 0x20 && curr_byte <= 0x7E
    }

    fn process_bytes(&mut self, curr_byte_arr: &[u8], stdout_locked: &mut io::StdoutLock) {
        pe(write!(
            stdout_locked,
            "| {}{:08x}{} : ",
            self.chrome_instance.get_red(),
            self.byte_count,
            self.chrome_instance.get_reset()
        ));
        for curr_byte in curr_byte_arr {
            if Hexdump::is_print(*curr_byte) {
                pe(write!(
                    stdout_locked,
                    "{}{:02x}{}",
                    self.chrome_instance.get_green(),
                    curr_byte,
                    self.chrome_instance.get_reset()
                ));
            } else if *curr_byte == 0x00 {
                pe(write!(
                    stdout_locked,
                    "{}{}{}",
                    self.chrome_instance.get_grey(),
                    "00",
                    self.chrome_instance.get_reset()
                ));
            } else {
                pe(write!(stdout_locked, "{:02x}", curr_byte));
            }

            if self.space_req {
                pe(write!(stdout_locked, " "));
            }

            self.space_req = !self.space_req;

            self.byte_count += 1;
        }

        if 16 - curr_byte_arr.len() != 0 {
            for _ in 0..(16 - curr_byte_arr.len()) {
                pe(write!(stdout_locked, ".."));

                if self.space_req {
                    pe(write!(stdout_locked, " "));
                }

                self.space_req = !self.space_req;
                self.byte_count += 1;
            }
        }

        pe(write!(stdout_locked, "| "));

        for curr_byte in curr_byte_arr {
            if Hexdump::is_print(*curr_byte) {
                pe(write!(
                    stdout_locked,
                    "{}{}{}",
                    self.chrome_instance.get_green(),
                    *curr_byte as char,
                    self.chrome_instance.get_reset()
                ));
            } else if *curr_byte == 0x00 {
                pe(write!(
                    stdout_locked,
                    "{}.{}",
                    self.chrome_instance.get_grey(),
                    self.chrome_instance.get_reset()
                ));
            } else {
                pe(write!(stdout_locked, "."));
            }
        }

        if 16 - curr_byte_arr.len() != 0 {
            for _ in 0..(16 - curr_byte_arr.len()) {
                pe(write!(stdout_locked, "."));
            }
        }

        pe(writeln!(stdout_locked, " |"));
    }
}