diff --git a/assets/pygmsh/ascii.vtk b/assets/pygmsh/ascii.vtk
new file mode 100644
index 0000000..c864984
--- /dev/null
+++ b/assets/pygmsh/ascii.vtk
@@ -0,0 +1,181 @@
+# vtk DataFile Version 5.1
+written by meshio v5.3.0
+ASCII
+DATASET UNSTRUCTURED_GRID
+POINTS 18 double
+0.0 0.0 0.0 1.0 -0.2 0.0 1.1 1.2 0.0 0.1 0.7 0.0 0.3333333333325021 -0.06666666666650042 0.0 0.6666666666657866 -0.1333333333331573 0.0 1.0249999999999424 0.14999999999919245 0.0 1.0499999999998704 0.4999999999981836 0.0 1.074999999999934 0.8499999999990746 0.0 0.766666666667985 1.0333333333339925 0.0 0.433333333334733 0.8666666666673664 0.0 0.050000000000122564 0.3500000000008579 0.0 0.7444729167676052 0.3524793413776178 0.0 0.3781088913238718 0.4816987298113132 0.0 0.7412636346823331 0.6806963451979247 0.0 0.5070791452210437 0.16277273408010906 0.0 0.253704273975508 0.18556095944515594 0.0 0.7797139636550688 0.08823831456107314 0.0
+CELLS 39 94
+OFFSETS vtktypeint64
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+CONNECTIVITY vtktypeint64
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+CELL_TYPES 38
+3
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diff --git a/assets/pygmsh/ascii.vtu b/assets/pygmsh/ascii.vtu
new file mode 100644
index 0000000..0d879a2
--- /dev/null
+++ b/assets/pygmsh/ascii.vtu
@@ -0,0 +1,248 @@
+
+
+
+
+
+
+
+0.00000000000e+00
+0.00000000000e+00
+0.00000000000e+00
+1.00000000000e+00
+-2.00000000000e-01
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+3.33333333333e-01
+-6.66666666665e-02
+0.00000000000e+00
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+0.00000000000e+00
+1.02500000000e+00
+1.49999999999e-01
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+
diff --git a/assets/pygmsh/binary.vtk b/assets/pygmsh/binary.vtk
new file mode 100644
index 0000000..a4151b9
Binary files /dev/null and b/assets/pygmsh/binary.vtk differ
diff --git a/assets/pygmsh/gen.py b/assets/pygmsh/gen.py
new file mode 100644
index 0000000..757ea34
--- /dev/null
+++ b/assets/pygmsh/gen.py
@@ -0,0 +1,25 @@
+import pygmsh
+
+with pygmsh.geo.Geometry() as geom:
+ p = geom.add_polygon(
+ [
+ [0.0, 0.0],
+ [1.0, -0.2],
+ [1.1, 1.2],
+ [0.1, 0.7],
+ ],
+ mesh_size=0.4,
+ )
+ geom.add_physical(p.lines[0], label="bottom")
+ geom.add_physical(p.lines[1], label="right")
+ geom.add_physical(p.lines[2], label="top")
+ geom.add_physical(p.lines[3], label="left")
+
+ mesh = geom.generate_mesh()
+
+mesh.write("no-compression.vtu", compression=None)
+mesh.write("lzma.vtu", compression="lzma")
+mesh.write("zlib.vtu", compression="zlib")
+mesh.write("ascii.vtu", binary=False)
+mesh.write("binary.vtk")
+mesh.write("ascii.vtk", binary=False)
diff --git a/assets/pygmsh/lzma.vtu b/assets/pygmsh/lzma.vtu
new file mode 100644
index 0000000..c7327e8
--- /dev/null
+++ b/assets/pygmsh/lzma.vtu
@@ -0,0 +1,24 @@
+
+
+
+
+
+
+
+AQAAAACAAACwAQAALAEAAA==/Td6WFoAAATm1rRGAgAhARYAAAB0L+Wj4AGvAOldAABuFTfD5hQGEWOiYOj3Slyvfg1L/Z3iyRycR0v7+mOn0ba3Qa6+uxHTkBa13rJ9UW0iFhj//utywp06/cuuBp7r/6RF/0kQoQF1wJmUOfjtXDwO7oyM72B1k1bOtSrX7Q0EP0RdrG6mYpB8fY3uRXcPLRuV7F4NlhoBsuNcKUphVnWEjbr0xN4z91QfOD8gJGvTgxj+c6oSBQZKgdtigQALByl5tf4xMtymx21LFrFg6zcv9wiCzWeolkrsvIzWHJ/1DV9+aqDd8NNsMoPJ8LbmXclBx+HI8VRh4JKcNhXg+zXNCDzMd6RhAAAAAPixvspGiUmFAAGFArADAAAV8tzoscRn+wIAAAAABFla
+
+
+
+
+AQAAAACAAADwAgAAsAAAAA==/Td6WFoAAATm1rRGAgAhARYAAAB0L+Wj4ALvAG5dAABqf4CGWT3j9Uqwil2OUtsCHzHFFrl+aqabptUzL9SOe39SAvCK7iPawz8fvDCpSHkBzp1bECAXygDmyLZ4X/nMqID8Eqbc4azCjU2G0AEMSPklcaC2HvsDEIGliAwrSJ1nUyGCUcs8KhCW/QesAAAAi+NSyjXe5WYAAYoB8AUAAJ8es8GxxGf7AgAAAAAEWVo=
+
+
+AQAAAACAAAAwAQAAgAAAAA==/Td6WFoAAATm1rRGAgAhARYAAAB0L+Wj4AEvAD9dAAEAOcG2vwm8gB0fh9y6FkceUbXO4HhwUvGjyt0gZdVKBz8EkkpMcf8iDB+6wFXI0nHkq4NBKD80x7XEniAEygAAlCvKhF26m8oAAVuwAgAAAHbs0h+xxGf7AgAAAAAEWVo=
+
+
+AQAAAACAAAAwAQAAUAAAAA==/Td6WFoAAATm1rRGAgAhARYAAAB0L+Wj4AEvAA9dAAGAOfWXBWQaoCCI8wHgAAAA85sVNsk6+VAAASuwAgAAALfh8BSxxGf7AgAAAAAEWVo=
+
+
+
+
+
diff --git a/assets/pygmsh/no-compression.vtu b/assets/pygmsh/no-compression.vtu
new file mode 100644
index 0000000..a168c8c
--- /dev/null
+++ b/assets/pygmsh/no-compression.vtu
@@ -0,0 +1,24 @@
+
+
+
+
+
+
+
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
+
+
+
+
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
+
+
+MAEAAAIAAAAAAAAABAAAAAAAAAAGAAAAAAAAAAgAAAAAAAAACgAAAAAAAAAMAAAAAAAAAA4AAAAAAAAAEAAAAAAAAAASAAAAAAAAABQAAAAAAAAAFgAAAAAAAAAYAAAAAAAAABsAAAAAAAAAHgAAAAAAAAAhAAAAAAAAACQAAAAAAAAAJwAAAAAAAAAqAAAAAAAAAC0AAAAAAAAAMAAAAAAAAAAzAAAAAAAAADYAAAAAAAAAOQAAAAAAAAA8AAAAAAAAAD8AAAAAAAAAQgAAAAAAAABFAAAAAAAAAEgAAAAAAAAASwAAAAAAAABOAAAAAAAAAFEAAAAAAAAAVAAAAAAAAABXAAAAAAAAAFoAAAAAAAAAWwAAAAAAAABcAAAAAAAAAF0AAAAAAAAAXgAAAAAAAAA=
+
+
+MAEAAAMAAAAAAAAAAwAAAAAAAAADAAAAAAAAAAMAAAAAAAAAAwAAAAAAAAADAAAAAAAAAAMAAAAAAAAAAwAAAAAAAAADAAAAAAAAAAMAAAAAAAAAAwAAAAAAAAADAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAABQAAAAAAAAAFAAAAAAAAAAUAAAAAAAAAAQAAAAAAAAABAAAAAAAAAAEAAAAAAAAAAQAAAAAAAAA=
+
+
+
+
+
diff --git a/assets/pygmsh/zlib.vtu b/assets/pygmsh/zlib.vtu
new file mode 100644
index 0000000..d1f6794
--- /dev/null
+++ b/assets/pygmsh/zlib.vtu
@@ -0,0 +1,24 @@
+
+
+
+
+
+
+
+AQAAAACAAACwAQAABQEAAA==eJxjYMAHPtjPmgkCJ/fDRCD8j/bGYPDZHlV8p30aGDyDi1+XCgWCq/ZujwQEBQU3ws2JMwOJP7X3/gESPwgXT04F6f9g33PQCGj+Ybg5rafOAMEHe/2G/0BwHy7OBVJm/NF+iRCIfg0Xf72tAwhe2CtOAdEf4OJWcnt279592z7qCpDajVA/8x7I/Svtjy4C2X8NLl518sTdHZee24s9fNfE2o8Q38S6ZNF7oxv2f2WPvFC7cg8ubjd9anPejuf2F8yXbHY+8RQuLrJCjfuf5QN7hz/HVuy5egQu3qD09OYGmwv2CnNk1coOHIeL/3Q8sinr8wv7WY7ezienbYOLAwDOhYjK
+
+
+
+
+AQAAAACAAADwAgAAfAAAAA==eJx1kUEOgCAMBEFRUBHw/5/1oHOZhF4mXZploSF8lcRNjOIuZrGIi3iIp7iKl0gxf/9s6qt0+zPnnOTyf/RJbvydF3//E7m4F7+muSK96hydXOR81Efp3iM6/uTu6nnXmJwPzQXpVJJODu53ni49Sbc/72Of7OUFXXQDPw==
+
+
+AQAAAACAAAAwAQAAWAAAAA==eJwtxdEGgwAAAMDJJMlkMhEjRsQYI8YYMSJGRKza/3/GHrp7uWC32Tt05NiJD059dOaTcxc+u/TFlWtfffPdjR9++uXWb3fu/fHg0ZO/nr149c9/z+4HFg==
+
+
+AQAAAACAAAAwAQAAFQAAAA==eJxjZoAAZhrRrEOMZiRAAwBbWACX
+
+
+
+
+
diff --git a/tests/pygmsh.rs b/tests/pygmsh.rs
new file mode 100644
index 0000000..9d09221
--- /dev/null
+++ b/tests/pygmsh.rs
@@ -0,0 +1,187 @@
+//! This test module tests against simple files generated by the pygmsh package.
+
+use nom::IResult;
+use vtkio::model::*;
+use vtkio::parser::*;
+use vtkio::writer::*;
+use vtkio::Error;
+
+macro_rules! test_b {
+ ($fn:ident ($in:expr, $($args:expr),*) => $out:expr) => {
+ assert_eq!($fn($in, $($args),*), IResult::Done("".as_bytes(), $out.clone()));
+ };
+ ($fn:ident ($in:expr) => $out:expr) => {
+ assert_eq!($fn($in), IResult::Done("".as_bytes(), $out.clone()));
+ };
+}
+
+macro_rules! test_ignore_rem {
+ ($fn:ident ($in:expr, $($args:expr),*) => $out:expr) => {
+ {
+ let result = $fn($in, $($args),*);
+ assert!(result.is_done());
+ assert_eq!(result.unwrap().1, $out.clone());
+ }
+ };
+ ($fn:ident ($in:expr) => $out:expr) => {
+ {
+ let result = $fn($in);
+ assert!(result.is_done());
+ assert_eq!(result.unwrap().1, $out.clone());
+ }
+ };
+}
+
+type Result = std::result::Result<(), Error>;
+
+// Helper functions to convert between endianness.
+
+fn ne(vtk: &Vtk) -> Vtk {
+ Vtk {
+ byte_order: ByteOrder::native(),
+ ..vtk.clone()
+ }
+}
+
+fn le(vtk: &Vtk) -> Vtk {
+ Vtk {
+ byte_order: ByteOrder::LittleEndian,
+ ..vtk.clone()
+ }
+}
+
+fn make_test_file() -> Vtk {
+ Vtk {
+ version: Version::new((5, 1)),
+ byte_order: ByteOrder::BigEndian,
+ title: String::from("written by meshio v5.3.0"),
+ file_path: None,
+ data: DataSet::inline(UnstructuredGridPiece {
+ points: vec![
+ 0.0f64,
+ 0.0,
+ 0.0,
+ 1.0,
+ -0.2,
+ 0.0,
+ 1.1,
+ 1.2,
+ 0.0,
+ 0.1,
+ 0.7,
+ 0.0,
+ 0.3333333333325021,
+ -0.06666666666650042,
+ 0.0,
+ 0.6666666666657866,
+ -0.1333333333331573,
+ 0.0,
+ 1.0249999999999424,
+ 0.14999999999919245,
+ 0.0,
+ 1.0499999999998704,
+ 0.4999999999981836,
+ 0.0,
+ 1.074999999999934,
+ 0.8499999999990746,
+ 0.0,
+ 0.766666666667985,
+ 1.0333333333339925,
+ 0.0,
+ 0.433333333334733,
+ 0.8666666666673664,
+ 0.0,
+ 0.050000000000122564,
+ 0.3500000000008579,
+ 0.0,
+ 0.7444729167676052,
+ 0.3524793413776178,
+ 0.0,
+ 0.3781088913238718,
+ 0.4816987298113132,
+ 0.0,
+ 0.7412636346823331,
+ 0.6806963451979247,
+ 0.0,
+ 0.5070791452210437,
+ 0.16277273408010906,
+ 0.0,
+ 0.253704273975508,
+ 0.18556095944515594,
+ 0.0,
+ 0.7797139636550688,
+ 0.08823831456107314,
+ 0.0,
+ ]
+ .into(),
+ cells: Cells {
+ cell_verts: VertexNumbers::XML {
+ offsets: vec![
+ 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 27, 30, 33, 36, 39, 42, 45,
+ 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 91, 92, 93, 94,
+ ],
+ connectivity: vec![
+ 0, 4, 4, 5, 5, 1, 1, 6, 6, 7, 7, 8, 8, 2, 2, 9, 9, 10, 10, 3, 3, 11, 11, 0,
+ 10, 13, 14, 13, 12, 14, 10, 3, 13, 8, 2, 9, 4, 5, 15, 9, 10, 14, 3, 11, 13,
+ 6, 7, 12, 8, 9, 14, 7, 8, 14, 12, 7, 14, 15, 5, 17, 5, 1, 17, 1, 6, 17, 12,
+ 13, 15, 13, 11, 16, 15, 13, 16, 11, 0, 16, 0, 4, 16, 6, 12, 17, 12, 15, 17,
+ 4, 15, 16, 0, 1, 2, 3,
+ ],
+ },
+ types: vec![
+ vec![CellType::Line; 12],
+ vec![CellType::Triangle; 22],
+ vec![CellType::Vertex; 4],
+ ]
+ .into_iter()
+ .flatten()
+ .collect::>(),
+ },
+ data: Attributes {
+ point: vec![],
+ cell: vec![],
+ },
+ }),
+ }
+}
+
+#[test]
+fn legacy_ascii() -> Result {
+ let input = include_str!("../assets/pygmsh/ascii.vtk").as_bytes();
+ let out1 = make_test_file();
+ assert!(parse_be(input).is_done());
+ test_ignore_rem!(parse_be(input) => out1);
+ let mut outtest = String::new();
+ outtest.write_vtk_ne(out1.clone())?;
+ println!("{}", outtest);
+ test_b!(parse_ne(String::new().write_vtk_ne(out1.clone())?.as_bytes()) => ne(&out1));
+ test_b!(parse_ne(Vec::::new().write_vtk_ne(out1.clone())?) => ne(&out1));
+ test_b!(parse_le(Vec::::new().write_vtk_le(out1.clone())?) => le(&out1));
+ test_b!(parse_be(Vec::::new().write_vtk_be(out1.clone())?) => out1);
+ Ok(())
+}
+
+#[test]
+fn legacy_binary() -> Result {
+ let input = include_bytes!("../assets/pygmsh/binary.vtk");
+ let out1 = make_test_file();
+ assert!(parse_be(input).is_done());
+ test_ignore_rem!(parse_be(input) => out1);
+ let mut outtest = String::new();
+ outtest.write_vtk_ne(out1.clone())?;
+ println!("{}", outtest);
+ test_b!(parse_ne(String::new().write_vtk_ne(out1.clone())?.as_bytes()) => ne(&out1));
+ test_b!(parse_ne(Vec::::new().write_vtk_ne(out1.clone())?) => ne(&out1));
+ test_b!(parse_le(Vec::::new().write_vtk_le(out1.clone())?) => le(&out1));
+ test_b!(parse_be(Vec::::new().write_vtk_be(out1.clone())?) => out1);
+ Ok(())
+}
+
+#[test]
+#[ignore]
+fn xml_ascii() -> Result {
+ let mut vtu = Vtk::import("./assets/pygmsh/ascii.vtu")?;
+ vtu.file_path = None; // Reset file path to satisfy comparison
+ assert_eq!(vtu, make_test_file());
+ Ok(())
+}