dotscope 0.6.0

A high-performance, cross-platform framework for analyzing and reverse engineering .NET PE executables
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

//! Binary reader implementation for `CustomDebugInformation` table entries.
//!
//! This module implements the [`crate::metadata::tables::types::RowReadable`] trait for
//! [`crate::metadata::tables::customdebuginformation::CustomDebugInformationRaw`],
//! enabling direct parsing of `CustomDebugInformation` table entries from binary
//! metadata streams. The implementation handles variable-sized fields based on
//! heap sizes and provides comprehensive test coverage for different data sizes.
//!
//! # Key Components
//!
//! - [`crate::metadata::tables::types::RowReadable`] implementation for [`crate::metadata::tables::customdebuginformation::CustomDebugInformationRaw`]
//!
//! # Thread Safety
//!
//! All parsing operations are thread-safe and stateless, enabling concurrent
//! processing of multiple table entries.

use crate::{
    metadata::{
        tables::{
            types::{CodedIndex, CodedIndexType, TableInfoRef},
            CustomDebugInformationRaw, RowReadable, TableId,
        },
        token::Token,
    },
    utils::read_le_at_dyn,
    Result,
};

impl RowReadable for CustomDebugInformationRaw {
    const TABLE_ID: TableId = TableId::CustomDebugInformation;

    fn row_read(data: &[u8], offset: &mut usize, rid: u32, sizes: &TableInfoRef) -> Result<Self> {
        let offset_org = *offset;

        let parent = CodedIndex::read(
            data,
            offset,
            sizes,
            CodedIndexType::HasCustomDebugInformation,
        )?;
        let kind = read_le_at_dyn(data, offset, sizes.is_large_guid())?;
        let value = read_le_at_dyn(data, offset, sizes.is_large_blob())?;

        Ok(CustomDebugInformationRaw {
            rid,
            token: Token::new(0x3700_0000 + rid),
            offset: offset_org,
            parent,
            kind,
            value,
        })
    }
}

#[cfg(test)]
mod tests {
    use std::sync::Arc;

    use super::*;
    use crate::metadata::tables::{MetadataTable, TableId, TableInfo};

    #[test]
    fn crafted_short() {
        let data = vec![
            0x06, 0x00, // parent (2 bytes, normal coded index) - 0x0006 (tag=6, row=0)
            0x01, 0x00, // kind (2 bytes, normal GUID heap) - 0x0001
            0x0A, 0x00, // value (2 bytes, normal blob heap) - 0x000A
        ];

        let sizes = Arc::new(TableInfo::new_test(
            &[
                (TableId::CustomDebugInformation, 1),
                (TableId::MethodDef, 1000),
            ],
            false,
            false,
            false,
        ));
        let table = MetadataTable::<CustomDebugInformationRaw>::new(&data, 1, sizes).unwrap();

        let eval = |row: CustomDebugInformationRaw| {
            assert_eq!(row.rid, 1);
            assert_eq!(row.token.value(), 0x37000001);
            assert_eq!(row.parent.row, 0);
            assert_eq!(row.kind, 0x0001);
            assert_eq!(row.value, 0x000A);
        };

        {
            for row in table.iter() {
                eval(row);
            }
        }

        {
            let row = table.get(1).unwrap();
            eval(row);
        }
    }

    #[test]
    fn crafted_long() {
        let data = vec![
            0x06, 0x01, 0x00,
            0x00, // parent (4 bytes, large coded index) - 0x00000106 (tag=6, row=8)
            0x01, 0x01, 0x00, 0x00, // kind (4 bytes, large GUID heap) - 0x00000101
            0x0A, 0x02, 0x00, 0x00, // value (4 bytes, large blob heap) - 0x0000020A
        ];

        let sizes = Arc::new(TableInfo::new_test(
            &[
                (TableId::CustomDebugInformation, 1),
                (TableId::MethodDef, 100000),
            ],
            true,
            true,
            true,
        ));
        let table = MetadataTable::<CustomDebugInformationRaw>::new(&data, 1, sizes).unwrap();

        let eval = |row: CustomDebugInformationRaw| {
            assert_eq!(row.rid, 1);
            assert_eq!(row.token.value(), 0x37000001);
            assert_eq!(row.parent.row, 8);
            assert_eq!(row.kind, 0x00000101);
            assert_eq!(row.value, 0x0000020A);
        };

        {
            for row in table.iter() {
                eval(row);
            }
        }

        {
            let row = table.get(1).unwrap();
            eval(row);
        }
    }
}