dotscope 0.6.0

A high-performance, cross-platform framework for analyzing and reverse engineering .NET PE executables
Documentation 
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//! Factory methods for circularity validation testing.
//!
//! Contains helper methods migrated from circularity validation source files
//! for creating test assemblies with various circularity validation scenarios.

use crate::{
    metadata::{
        tables::{CodedIndex, CodedIndexType, TableDataOwned, TableId, TypeAttributes, TypeDefRaw},
        token::Token,
    },
    test::{create_test_assembly, get_testfile_mscorlib, TestAssembly},
    Error, Result,
};

/// Main factory method for creating circularity validation test assemblies
///
/// Originally from: `src/metadata/validation/validators/owned/relationships/circularity.rs`
pub fn owned_circularity_validator_file_factory() -> Result<Vec<TestAssembly>> {
    let mut assemblies = Vec::new();

    let Some(clean_testfile) = get_testfile_mscorlib() else {
        return Err(Error::Other(
            "mscorlib.dll not available - test cannot run".to_string(),
        ));
    };

    // 1. REQUIRED: Clean assembly - should pass all circularity validation
    assemblies.push(TestAssembly::new(&clean_testfile, true));

    // 2. NEGATIVE: Test circular inheritance chain (A->B->A)
    assemblies.push(create_assembly_with_circular_inheritance()?);

    // 3. NEGATIVE: Test self-referential type definition
    assemblies.push(create_assembly_with_self_referential_type()?);

    // 4. NEGATIVE: Test circular interface implementation
    assemblies.push(create_assembly_with_circular_interface_implementation()?);

    Ok(assemblies)
}

/// Creates an assembly with circular inheritance (A->B->A)
///
/// Originally from: `src/metadata/validation/validators/owned/relationships/circularity.rs`
pub fn create_assembly_with_circular_inheritance() -> Result<TestAssembly> {
    create_test_assembly(get_testfile_mscorlib, |assembly| {
        // Create type A name
        let type_a_name_index = assembly.string_add("TypeA")?;

        // Create type B name
        let type_b_name_index = assembly.string_add("TypeB")?;

        let type_a_rid = assembly.original_table_row_count(TableId::TypeDef) + 1;
        let type_b_rid = type_a_rid + 1;

        // Create TypeA that extends TypeB
        let type_a = TypeDefRaw {
            rid: type_a_rid,
            token: Token::new(0x02000000 + type_a_rid),
            offset: 0,
            flags: TypeAttributes::PUBLIC,
            type_name: type_a_name_index.placeholder(),
            type_namespace: 0,
            extends: CodedIndex::new(TableId::TypeDef, type_b_rid, CodedIndexType::TypeDefOrRef), // A extends B
            field_list: 1,
            method_list: 1,
        };

        // Create TypeB that extends TypeA - creates circular inheritance
        let type_b = TypeDefRaw {
            rid: type_b_rid,
            token: Token::new(0x02000000 + type_b_rid),
            offset: 0,
            flags: TypeAttributes::PUBLIC,
            type_name: type_b_name_index.placeholder(),
            type_namespace: 0,
            extends: CodedIndex::new(TableId::TypeDef, type_a_rid, CodedIndexType::TypeDefOrRef), // B extends A - circular!
            field_list: 1,
            method_list: 1,
        };

        assembly.table_row_add(TableId::TypeDef, TableDataOwned::TypeDef(type_a))?;
        assembly.table_row_add(TableId::TypeDef, TableDataOwned::TypeDef(type_b))?;

        Ok(())
    })
}

/// Creates an assembly with self-referential type definition
///
/// Originally from: `src/metadata/validation/validators/owned/relationships/circularity.rs`
pub fn create_assembly_with_self_referential_type() -> Result<TestAssembly> {
    create_test_assembly(get_testfile_mscorlib, |assembly| {
        // Create self-referential type name
        let type_name_index = assembly.string_add("SelfReferentialType")?;

        let type_rid = assembly.original_table_row_count(TableId::TypeDef) + 1;

        // Create type that extends itself - direct circular inheritance
        let self_ref_type = TypeDefRaw {
            rid: type_rid,
            token: Token::new(0x02000000 + type_rid),
            offset: 0,
            flags: TypeAttributes::PUBLIC,
            type_name: type_name_index.placeholder(),
            type_namespace: 0,
            extends: CodedIndex::new(TableId::TypeDef, type_rid, CodedIndexType::TypeDefOrRef), // Extends itself!
            field_list: 1,
            method_list: 1,
        };

        assembly.table_row_add(TableId::TypeDef, TableDataOwned::TypeDef(self_ref_type))?;

        Ok(())
    })
}

/// Creates an assembly with circular interface implementation
///
/// Originally from: `src/metadata/validation/validators/owned/relationships/circularity.rs`
pub fn create_assembly_with_circular_interface_implementation() -> Result<TestAssembly> {
    create_test_assembly(get_testfile_mscorlib, |assembly| {
        // Create interface I1 name
        let interface_i1_name_index = assembly.string_add("IInterface1")?;

        // Create interface I2 name
        let interface_i2_name_index = assembly.string_add("IInterface2")?;

        let interface_i1_rid = assembly.original_table_row_count(TableId::TypeDef) + 1;
        let interface_i2_rid = interface_i1_rid + 1;

        // Create IInterface1 that extends IInterface2
        let interface_i1 = TypeDefRaw {
            rid: interface_i1_rid,
            token: Token::new(0x02000000 + interface_i1_rid),
            offset: 0,
            flags: TypeAttributes::INTERFACE | TypeAttributes::ABSTRACT | TypeAttributes::PUBLIC,
            type_name: interface_i1_name_index.placeholder(),
            type_namespace: 0,
            extends: CodedIndex::new(
                TableId::TypeDef,
                interface_i2_rid,
                CodedIndexType::TypeDefOrRef,
            ), // I1 extends I2
            field_list: 1,
            method_list: 1,
        };

        // Create IInterface2 that extends IInterface1 - creates circular interface implementation
        let interface_i2 = TypeDefRaw {
            rid: interface_i2_rid,
            token: Token::new(0x02000000 + interface_i2_rid),
            offset: 0,
            flags: TypeAttributes::INTERFACE | TypeAttributes::ABSTRACT | TypeAttributes::PUBLIC,
            type_name: interface_i2_name_index.placeholder(),
            type_namespace: 0,
            extends: CodedIndex::new(
                TableId::TypeDef,
                interface_i1_rid,
                CodedIndexType::TypeDefOrRef,
            ), // I2 extends I1 - circular!
            field_list: 1,
            method_list: 1,
        };

        assembly.table_row_add(TableId::TypeDef, TableDataOwned::TypeDef(interface_i1))?;
        assembly.table_row_add(TableId::TypeDef, TableDataOwned::TypeDef(interface_i2))?;

        Ok(())
    })
}