horntail 0.4.2

maplestory resource file unpack lib
Documentation 
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

use crate::crypto::MapleCipher;
use crate::reader::Accessor;
use crate::{AccessorBuilder, Error};
use std::io;
use std::io::{ErrorKind, Read, SeekFrom};
use std::rc::Rc;

pub struct BinaryAccessor<T> {
    cipher: Box<dyn MapleCipher>,
    data: T,
    pos: u64,
    size: u64,
}

impl<T: AsRef<[u8]>> BinaryAccessor<T> {
    #[inline]
    pub fn new<C: MapleCipher + 'static>(cipher: C, data: T) -> BinaryAccessor<T> {
        Self::from_boxed(cipher.into_boxed(), data)
    }

    pub fn from_boxed(cipher: Box<dyn MapleCipher>, data: T) -> BinaryAccessor<T> {
        let size = data.as_ref().len() as u64;
        BinaryAccessor {
            cipher,
            data,
            pos: 0,
            size,
        }
    }
}

impl<T: AsRef<[u8]>> Read for BinaryAccessor<T> {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        let data = self.data.as_ref();
        let pos = self.pos.min(data.len() as u64);
        let (_, mut r) = data.split_at(pos as usize);
        let n = Read::read(&mut r, buf)?;
        self.pos += n as u64;
        Ok(n)
    }
}

impl<T: AsRef<[u8]>> MapleCipher for BinaryAccessor<T> {
    #[inline]
    fn crypt(&mut self, dst: &mut [u8]) {
        self.cipher.crypt(dst);
    }

    #[inline]
    fn clone_boxed(&self) -> Box<dyn MapleCipher> {
        self.cipher.clone_boxed()
    }
}

impl<T: AsRef<[u8]>> Accessor for BinaryAccessor<T> {
    #[inline]
    fn pos(&self) -> usize {
        self.pos as usize
    }

    #[inline]
    fn len(&self) -> usize {
        self.size as usize
    }

    #[inline]
    fn try_seek(&mut self, style: SeekFrom) -> Result<u64, Error> {
        let (base_pos, offset) = match style {
            SeekFrom::Start(n) => {
                self.pos = n;
                return Ok(n);
            }
            SeekFrom::End(n) => (self.data.as_ref().len() as u64, n),
            SeekFrom::Current(n) => (self.pos, n),
        };

        match base_pos.checked_add_signed(offset) {
            Some(n) => {
                self.pos = n;
                Ok(self.pos)
            }
            None => Err(Error::IO(io::Error::new(
                ErrorKind::InvalidInput,
                "invalid seek to a negative or overflowing position",
            ))),
        }
    }

    #[inline]
    fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error> {
        Ok(Read::read(self, buf)?)
    }
}

#[derive(Clone)]
struct RcSliceWrapper(Rc<dyn AsRef<[u8]>>);

impl AsRef<[u8]> for RcSliceWrapper {
    fn as_ref(&self) -> &[u8] {
        self.0.as_ref().as_ref()
    }
}

pub struct BinaryBuilder {
    cipher: Box<dyn MapleCipher>,
    slice: RcSliceWrapper,
}

impl BinaryBuilder {
    #[inline]
    pub fn new<C: MapleCipher + 'static, T: AsRef<[u8]> + 'static>(
        cipher: C,
        source: T,
    ) -> BinaryBuilder {
        Self::from_boxed(cipher.into_boxed(), source)
    }

    pub fn from_boxed<T: AsRef<[u8]> + 'static>(
        cipher: Box<dyn MapleCipher>,
        source: T,
    ) -> BinaryBuilder {
        BinaryBuilder {
            cipher,
            slice: RcSliceWrapper(Rc::new(source)),
        }
    }
}

impl AccessorBuilder for BinaryBuilder {
    fn clone_boxed(&self) -> Box<dyn AccessorBuilder> {
        Box::new(BinaryBuilder {
            cipher: self.cipher.clone_boxed(),
            slice: self.slice.clone(),
        })
    }

    fn accessor(&self) -> Box<dyn Accessor> {
        Box::new(BinaryAccessor::from_boxed(
            self.cipher.clone_boxed(),
            self.slice.clone(),
        ))
    }
}