redguard-preservation 0.6.2

A CLI tool to preserve Redguard files
Documentation 
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use super::*;

fn approx_eq(a: f32, b: f32) {
    let diff = (a - b).abs();
    assert!(diff < 1.0e-6, "expected {b}, got {a}, diff {diff}");
}

#[test]
fn decode_position_applies_fixed_point_scaling_on_all_axes() {
    let pos = positioning::decode_position(1, -2, 3);

    approx_eq(pos[0], -(256.0 / 5120.0));
    approx_eq(pos[1], 512.0 / 5120.0);
    approx_eq(pos[2], -((0x00FF_FFFF_i64 - (3_i64 * 256)) as f32) / 5120.0);
}

#[test]
fn decode_position_does_not_collapse_small_values_to_origin() {
    let pos = positioning::decode_position(1, 1, 1);

    assert!(pos[0].abs() > 0.01, "x too close to origin: {}", pos[0]);
    assert!(pos[1].abs() > 0.01, "y too close to origin: {}", pos[1]);
}

#[test]
fn marker_metadata_reads_positions_before_auxiliary_bytes() {
    let mut data = 2u32.to_le_bytes().to_vec();
    for coordinate in [20i32, -40, 65536, 100, 60, -3] {
        data.extend_from_slice(&coordinate.to_le_bytes());
    }
    data.extend_from_slice(&[7, 9]);
    let rgm = RgmFile {
        sections: vec![RgmSection::Mpm(
            RgmSectionHeader {
                name: *b"MPMK",
                data_length: 30,
                record_count: None,
            },
            data,
        )],
    };
    let metadata = export_rgm_metadata_json(&rgm, None);
    let markers = metadata["markers"].as_array().unwrap();
    assert_eq!(markers.len(), 2);
    assert_eq!(
        markers[0]["map_position"],
        serde_json::json!([20, -40, 65536])
    );
    assert_eq!(markers[1]["map_position"], serde_json::json!([100, 60, -3]));
    assert_eq!(markers[0]["position"][0], -1.0);
    assert_eq!(markers[0]["position"][1], 2.0);
    assert_eq!(markers[1]["position"][0], -5.0);
    assert_eq!(markers[1]["position"][1], -3.0);
    assert_eq!(markers[0]["reserved"], 7);
    assert_eq!(markers[1]["reserved"], 9);
}

#[test]
fn marker_metadata_rejects_truncated_tables_before_allocating() {
    let rgm = RgmFile {
        sections: vec![RgmSection::Mpm(
            RgmSectionHeader {
                name: *b"MPMK",
                data_length: 4,
                record_count: None,
            },
            u32::MAX.to_le_bytes().to_vec(),
        )],
    };
    let metadata = export_rgm_metadata_json(&rgm, None);
    assert_eq!(metadata["markers"], serde_json::json!([]));
}