dotscope 0.6.0

A high-performance, cross-platform framework for analyzing and reverse engineering .NET PE executables
Documentation 
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//! Binary reader implementation for the `FieldMarshal` metadata table.
//!
//! This module provides the [`RowReadable`] trait implementation for [`FieldMarshalRaw`],
//! enabling direct binary parsing of `FieldMarshal` table entries from metadata streams.
//! The implementation handles both 2-byte and 4-byte coded index formats and blob heap
//! index sizes based on metadata heap requirements.
//!
//! # Binary Format
//! Each `FieldMarshal` table row contains:
//! - **Parent** (2/4 bytes): `HasFieldMarshal` coded index (Field or Param reference)
//! - **NativeType** (2/4 bytes): Blob heap index containing marshalling signature
//!
//! The field sizes depend on the coded index size requirements and blob heap size.
//!
//! # ECMA-335 Reference
//! See ECMA-335, Partition II, ยง22.17 for the `FieldMarshal` table specification.

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

impl RowReadable for FieldMarshalRaw {
    const TABLE_ID: TableId = TableId::FieldMarshal;

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

        Ok(FieldMarshalRaw {
            rid,
            token: Token::new(0x0D00_0000 + rid),
            offset: offset_org,
            parent: CodedIndex::read(data, offset, sizes, CodedIndexType::HasFieldMarshal)?,
            native_type: read_le_at_dyn(data, offset, sizes.is_large_blob())?,
        })
    }
}

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

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

    use super::*;

    #[test]
    fn crafted_short() {
        let data = vec![
            0x02, 0x02, // parent
            0x03, 0x03, // native_type
        ];

        let sizes = Arc::new(TableInfo::new_test(
            &[(TableId::Field, 1), (TableId::Param, 1)],
            false,
            false,
            false,
        ));
        let table = MetadataTable::<FieldMarshalRaw>::new(&data, 1, sizes).unwrap();

        let eval = |row: FieldMarshalRaw| {
            assert_eq!(row.rid, 1);
            assert_eq!(row.token.value(), 0x0D000001);
            assert_eq!(
                row.parent,
                CodedIndex::new(TableId::Field, 257, CodedIndexType::HasFieldMarshal)
            );
            assert_eq!(row.native_type, 0x303);
        };

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

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

    #[test]
    fn crafted_long() {
        let data = vec![
            0x02, 0x02, 0x02, 0x02, // parent
            0x03, 0x03, 0x03, 0x03, // native_type
        ];

        let sizes = Arc::new(TableInfo::new_test(
            &[
                (TableId::Field, u16::MAX as u32 + 3),
                (TableId::Param, u16::MAX as u32 + 3),
            ],
            true,
            true,
            true,
        ));
        let table =
            MetadataTable::<FieldMarshalRaw>::new(&data, u16::MAX as u32 + 3, sizes).unwrap();

        let eval = |row: FieldMarshalRaw| {
            assert_eq!(row.rid, 1);
            assert_eq!(row.token.value(), 0x0D000001);
            assert_eq!(
                row.parent,
                CodedIndex::new(TableId::Field, 0x1010101, CodedIndexType::HasFieldMarshal)
            );
            assert_eq!(row.native_type, 0x3030303);
        };

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

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