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writer.rs
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/
writer.rs
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use crate::model::*;
use crate::IOBuffer;
use byteorder::{BigEndian, ByteOrder, LittleEndian, NativeEndian};
use std::fmt::Arguments;
mod write_vtk_impl {
use super::*;
use byteorder::WriteBytesExt;
pub mod error {
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum EntryPart {
/// The part of a header with just tags.
Tags,
/// The part of the header with corresponding size info.
Sizes,
/// Tags and sizes together.
Header,
/// The actually data for the entry (this can be binary or ASCII).
/// If applicable, this enum will report any IO errors when writing data.
Data(Option<std::io::ErrorKind>),
/// Lookup table name. Only relevant for Scalars.
LookupTable,
}
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum AttributeError {
Scalars(EntryPart),
ColorScalars(EntryPart),
LookupTable(EntryPart),
Vectors(EntryPart),
Normals(EntryPart),
TextureCoordinates(EntryPart),
Tensors(EntryPart),
Field(EntryPart),
FieldArray(EntryPart),
}
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum Header {
Version,
Title,
/// Binary or ASCII.
FileType,
}
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum DataSetPart {
/// Tags identifying the data set type. For example UNSTRUCTURED_GRID or POLY_DATA.
Tags,
Points(EntryPart),
Cells(EntryPart),
CellTypes(EntryPart),
Dimensions,
Origin,
Spacing(EntryPart),
XCoordinates(EntryPart),
YCoordinates(EntryPart),
ZCoordinates(EntryPart),
}
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum DataSetError {
FieldDataHeader,
FieldArray(EntryPart),
PolyData(DataSetPart),
UnstructuredGrid(DataSetPart),
StructuredGrid(DataSetPart),
StructuredPoints(DataSetPart),
RectilinearGrid(DataSetPart),
}
#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum Error {
PointDataHeader,
CellDataHeader,
Attribute(AttributeError),
Header(Header),
DataSet(DataSetError),
NewLine,
/// Unexpected type stored in referenced data buffer. This is most likely caused by
/// data corruption.
DataMismatchError,
/// Generic formatting error originating from [`std::fmt::Error`].
FormatError,
/// Generic IO error originating from [`std::io::Error`].
IOError(std::io::ErrorKind),
}
/// Extract a raw IO Error from our error if any. This helps annotate the IO error with
/// where it originated from when reported from lower level functions.
impl Into<Option<std::io::ErrorKind>> for Error {
fn into(self) -> Option<std::io::ErrorKind> {
match self {
Error::IOError(err) => Some(err),
_ => None,
}
}
}
impl From<std::fmt::Error> for Error {
fn from(_: std::fmt::Error) -> Error {
Error::FormatError
}
}
impl From<std::io::Error> for Error {
fn from(err: std::io::Error) -> Error {
Error::IOError(err.kind())
}
}
}
pub use self::error::Error;
use self::error::*;
/// A typical result of a write operation.
type Result = std::result::Result<(), Error>;
pub trait WriteVtkImpl {
/// This function is called by the `write!` macro used throughout this module.
/// Each writer needs to call the appropriate `write_fmt` in the implementation
/// of this method.
fn write_fmt(&mut self, args: Arguments) -> Result;
fn write_file_type(&mut self) -> Result;
fn write_cell_types<BO: ByteOrder>(&mut self, data: Vec<CellType>) -> Result;
fn write_u32_vec<BO: ByteOrder>(&mut self, data: Vec<u32>) -> Result;
fn write_buf<BO: ByteOrder>(&mut self, data: IOBuffer) -> Result;
fn write_attrib<BO: ByteOrder>(
&mut self,
data: Attributes,
num_points: usize,
num_cells: usize,
) -> Result {
write!(self, "\nPOINT_DATA {}\n", num_points).map_err(|_| Error::PointDataHeader)?;
self.write_attrib_data::<BO>(data.point)?;
write!(self, "\nCELL_DATA {}\n", num_cells).map_err(|_| Error::CellDataHeader)?;
self.write_attrib_data::<BO>(data.cell)
}
fn write_attrib_data<BO: ByteOrder>(&mut self, data: Vec<(String, Attribute)>) -> Result {
for (name, attrib) in data {
writeln!(self).map_err(|_| Error::NewLine)?;
match attrib {
Attribute::Scalars {
num_comp,
lookup_table,
data,
} => {
writeln!(
self,
"SCALARS {} {} {}",
name,
DataType::from(data.element_type_id()),
num_comp
)
.map_err(|_| {
Error::Attribute(AttributeError::Scalars(EntryPart::Header))
})?;
writeln!(
self,
"LOOKUP_TABLE {}",
lookup_table.unwrap_or_else(|| String::from("default"))
)
.map_err(|_| {
Error::Attribute(AttributeError::Scalars(EntryPart::LookupTable))
})?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::Scalars(EntryPart::Data(e.into())))
})?;
}
Attribute::ColorScalars { num_comp, data } => {
writeln!(self, "COLOR_SCALARS {} {}", name, num_comp).map_err(|_| {
Error::Attribute(AttributeError::ColorScalars(EntryPart::Header))
})?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::ColorScalars(EntryPart::Data(
e.into(),
)))
})?;
}
Attribute::LookupTable { data } => {
writeln!(self, "LOOKUP_TABLE {} {}", name, data.len() / 4).map_err(
|_| Error::Attribute(AttributeError::LookupTable(EntryPart::Header)),
)?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::LookupTable(EntryPart::Data(e.into())))
})?;
}
Attribute::Vectors { data } => {
writeln!(
self,
"VECTORS {} {}",
name,
DataType::from(data.element_type_id())
)
.map_err(|_| {
Error::Attribute(AttributeError::Vectors(EntryPart::Header))
})?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::Vectors(EntryPart::Data(e.into())))
})?;
}
Attribute::Normals { data } => {
writeln!(
self,
"NORMALS {} {}",
name,
DataType::from(data.element_type_id())
)
.map_err(|_| {
Error::Attribute(AttributeError::Normals(EntryPart::Header))
})?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::Normals(EntryPart::Data(e.into())))
})?;
}
Attribute::TextureCoordinates { dim, data } => {
writeln!(
self,
"TEXTURE_COORDINATES {} {} {}",
name,
dim,
DataType::from(data.element_type_id())
)
.map_err(|_| {
Error::Attribute(AttributeError::TextureCoordinates(EntryPart::Header))
})?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::TextureCoordinates(EntryPart::Data(
e.into(),
)))
})?;
}
Attribute::Tensors { data } => {
writeln!(
self,
"TENSORS {} {}",
name,
DataType::from(data.element_type_id())
)
.map_err(|_| {
Error::Attribute(AttributeError::Tensors(EntryPart::Header))
})?;
self.write_buf::<BO>(data).map_err(|e| {
Error::Attribute(AttributeError::Tensors(EntryPart::Data(e.into())))
})?;
}
Attribute::Field { data_array } => {
writeln!(self, "FIELD {} {}", name, data_array.len()).map_err(|_| {
Error::Attribute(AttributeError::Field(EntryPart::Header))
})?;
for field in data_array {
writeln!(
self,
"{} {} {} {}",
field.name,
field.num_comp,
field.data.len() / field.num_comp as usize,
DataType::from(field.data.element_type_id())
)
.map_err(|_| {
Error::Attribute(AttributeError::FieldArray(EntryPart::Header))
})?;
self.write_buf::<BO>(field.data).map_err(|e| {
Error::Attribute(AttributeError::FieldArray(EntryPart::Data(
e.into(),
)))
})?;
}
}
}
}
Ok(())
}
fn write_vtk_impl<BO: ByteOrder>(
&mut self,
vtk: Vtk,
) -> std::result::Result<&mut Self, Error> {
writeln!(self, "# vtk DataFile Version {}", vtk.version)
.map_err(|_| Error::Header(Header::Version))?;
writeln!(self, "{}", vtk.title).map_err(|_| Error::Header(Header::Version))?;
self.write_file_type()?;
match vtk.data {
DataSet::Field { name, data_array } => {
writeln!(self, "FIELD {} {}", name, data_array.len())
.map_err(|_| Error::DataSet(DataSetError::FieldDataHeader))?;
for field in data_array {
writeln!(
self,
"{} {} {} {}",
field.name,
field.num_comp,
field.data.len() / field.num_comp as usize,
DataType::from(field.data.element_type_id())
)
.map_err(|_| Error::DataSet(DataSetError::FieldArray(EntryPart::Header)))?;
self.write_buf::<BO>(field.data).map_err(|e| {
Error::DataSet(DataSetError::FieldArray(EntryPart::Data(e.into())))
})?;
}
}
DataSet::PolyData { points, topo, data } => {
writeln!(self, "DATASET POLYDATA")
.map_err(|_| Error::DataSet(DataSetError::PolyData(DataSetPart::Tags)))?;
writeln!(
self,
"POINTS {} {}",
points.len() / 3,
DataType::from(points.element_type_id())
)
.map_err(|_| {
Error::DataSet(DataSetError::PolyData(DataSetPart::Points(
EntryPart::Header,
)))
})?;
let num_points = points.len() / 3;
self.write_buf::<BO>(points).map_err(|e| {
Error::DataSet(DataSetError::PolyData(DataSetPart::Points(
EntryPart::Data(e.into()),
)))
})?;
writeln!(self).map_err(|_| Error::NewLine)?;
let mut num_cells = 0;
for topo_type in topo {
match topo_type {
PolyDataTopology::Vertices(_) => write!(self, "VERTICES"),
PolyDataTopology::Lines(_) => write!(self, "LINES"),
PolyDataTopology::Polygons(_) => write!(self, "POLYGONS"),
PolyDataTopology::TriangleStrips(_) => write!(self, "TRIANGLE_STRIPS"),
}
.map_err(|_| {
Error::DataSet(DataSetError::PolyData(DataSetPart::Cells(
EntryPart::Tags,
)))
})?;
let cells = match topo_type {
PolyDataTopology::Vertices(c) => c,
PolyDataTopology::Lines(c) => c,
PolyDataTopology::Polygons(c) => c,
PolyDataTopology::TriangleStrips(c) => c,
};
writeln!(self, " {} {}", cells.num_cells, cells.vertices.len()).map_err(
|_| {
Error::DataSet(DataSetError::PolyData(DataSetPart::Cells(
EntryPart::Sizes,
)))
},
)?;
self.write_u32_vec::<BO>(cells.vertices).map_err(|e| {
Error::DataSet(DataSetError::PolyData(DataSetPart::Cells(
EntryPart::Data(e.into()),
)))
})?;
num_cells += cells.num_cells as usize;
}
self.write_attrib::<BO>(data, num_points, num_cells)?;
}
DataSet::UnstructuredGrid {
points,
cells,
cell_types,
data,
} => {
writeln!(self, "DATASET UNSTRUCTURED_GRID").map_err(|_| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::Tags))
})?;
writeln!(
self,
"POINTS {} {}",
points.len() / 3,
DataType::from(points.element_type_id())
)
.map_err(|_| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::Points(
EntryPart::Header,
)))
})?;
let num_points = points.len() / 3;
self.write_buf::<BO>(points).map_err(|e| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::Points(
EntryPart::Data(e.into()),
)))
})?;
writeln!(self, "\nCELLS {} {}", cells.num_cells, cells.vertices.len())
.map_err(|_| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::Cells(
EntryPart::Header,
)))
})?;
self.write_u32_vec::<BO>(cells.vertices).map_err(|e| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::Cells(
EntryPart::Data(e.into()),
)))
})?;
writeln!(self, "\nCELL_TYPES {}", cell_types.len()).map_err(|_| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::CellTypes(
EntryPart::Header,
)))
})?;
self.write_cell_types::<BO>(cell_types)?;
self.write_attrib::<BO>(data, num_points, cells.num_cells as usize)?;
}
DataSet::StructuredPoints {
dims,
origin,
spacing,
data,
} => {
writeln!(self, "DATASET STRUCTURED_POINTS").map_err(|_| {
Error::DataSet(DataSetError::StructuredPoints(DataSetPart::Tags))
})?;
writeln!(self, "DIMENSIONS {} {} {}", dims[0], dims[1], dims[2]).map_err(
|_| Error::DataSet(DataSetError::StructuredPoints(DataSetPart::Dimensions)),
)?;
writeln!(self, "ORIGIN {} {} {}", origin[0], origin[1], origin[2]).map_err(
|_| Error::DataSet(DataSetError::StructuredPoints(DataSetPart::Origin)),
)?;
if vtk.version.major < 2 {
write!(self, "ASPECT_RATIO")
} else {
write!(self, "SPACING")
}
.map_err(|_| {
Error::DataSet(DataSetError::StructuredPoints(DataSetPart::Spacing(
EntryPart::Tags,
)))
})?;
writeln!(self, " {} {} {}", spacing[0], spacing[1], spacing[2]).map_err(
|_| {
Error::DataSet(DataSetError::StructuredPoints(DataSetPart::Spacing(
EntryPart::Sizes,
)))
},
)?;
let num_points = (dims[0] * dims[1] * dims[2]) as usize;
self.write_attrib::<BO>(data, num_points, 0)?;
}
DataSet::StructuredGrid { dims, points, data } => {
writeln!(self, "DATASET STRUCTURED_GRID").map_err(|_| {
Error::DataSet(DataSetError::StructuredGrid(DataSetPart::Tags))
})?;
writeln!(self, "DIMENSIONS {} {} {}", dims[0], dims[1], dims[2]).map_err(
|_| Error::DataSet(DataSetError::StructuredGrid(DataSetPart::Dimensions)),
)?;
writeln!(
self,
"POINTS {} {}",
points.len() / 3,
DataType::from(points.element_type_id())
)
.map_err(|_| {
Error::DataSet(DataSetError::StructuredGrid(DataSetPart::Points(
EntryPart::Header,
)))
})?;
let num_points = points.len() / 3;
self.write_buf::<BO>(points).map_err(|e| {
Error::DataSet(DataSetError::StructuredGrid(DataSetPart::Points(
EntryPart::Data(e.into()),
)))
})?;
assert_eq!((dims[0] * dims[1] * dims[2]) as usize, num_points);
self.write_attrib::<BO>(data, num_points, 1)?;
}
DataSet::RectilinearGrid {
dims,
x_coords,
y_coords,
z_coords,
data,
} => {
writeln!(self, "DATASET RECTILINEAR_GRID").map_err(|_| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::Tags))
})?;
writeln!(self, "DIMENSIONS {} {} {}", dims[0], dims[1], dims[2]).map_err(
|_| Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::Dimensions)),
)?;
writeln!(
self,
"X_COORDINATES {} {}",
x_coords.len(),
DataType::from(x_coords.element_type_id())
)
.map_err(|_| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::XCoordinates(
EntryPart::Header,
)))
})?;
let num_x_coords = x_coords.len();
self.write_buf::<BO>(x_coords).map_err(|e| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::XCoordinates(
EntryPart::Data(e.into()),
)))
})?;
writeln!(
self,
"Y_COORDINATES {} {}",
y_coords.len(),
DataType::from(y_coords.element_type_id())
)
.map_err(|_| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::YCoordinates(
EntryPart::Header,
)))
})?;
let num_y_coords = y_coords.len();
self.write_buf::<BO>(y_coords).map_err(|e| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::YCoordinates(
EntryPart::Data(e.into()),
)))
})?;
writeln!(
self,
"Z_COORDINATES {} {}",
z_coords.len(),
DataType::from(z_coords.element_type_id())
)
.map_err(|_| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::ZCoordinates(
EntryPart::Header,
)))
})?;
let num_z_coords = z_coords.len();
self.write_buf::<BO>(z_coords).map_err(|e| {
Error::DataSet(DataSetError::RectilinearGrid(DataSetPart::ZCoordinates(
EntryPart::Data(e.into()),
)))
})?;
let num_points = num_x_coords * num_y_coords * num_z_coords;
let num_cells = (num_x_coords - 1) * (num_y_coords - 1) * (num_z_coords - 1);
self.write_attrib::<BO>(data, num_points, num_cells)?;
}
}
writeln!(self).map_err(|_| Error::NewLine)?;
Ok(self)
}
}
impl WriteVtkImpl for Vec<u8> {
fn write_fmt(&mut self, args: Arguments) -> Result {
std::io::Write::write_fmt(self, args)?;
Ok(())
}
fn write_file_type(&mut self) -> Result {
writeln!(self, "BINARY\n").map_err(|_| Error::Header(Header::FileType))
}
fn write_cell_types<BO: ByteOrder>(&mut self, data: Vec<CellType>) -> Result {
let err_fn = |ek: Option<std::io::ErrorKind>| {
Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::CellTypes(
EntryPart::Data(ek),
)))
};
let err = |e: std::io::Error| err_fn(Some(e.kind()));
for t in data {
self.write_i32::<BO>(t as i32).map_err(err)?;
}
writeln!(self).map_err(|_| Error::NewLine)
}
fn write_u32_vec<BO: ByteOrder>(&mut self, data: Vec<u32>) -> Result {
let buf = IOBuffer::from(data);
self.write_buf::<BO>(buf)
}
fn write_buf<BO: ByteOrder>(&mut self, buf: IOBuffer) -> Result {
use std::any::TypeId;
fn write_buf_impl<T, W, E>(buf: IOBuffer, writer: &mut W, elem_writer: E) -> Result
where
W: WriteBytesExt,
E: Fn(&mut W, T) -> std::io::Result<()>,
T: 'static,
{
if let Some(vec) = buf.into_vec::<T>() {
for elem in vec {
elem_writer(writer, elem)?;
}
Ok(())
} else {
Err(Error::DataMismatchError)
}
}
match buf.element_type_id() {
x if x == TypeId::of::<u8>() => write_buf_impl(buf, self, Self::write_u8)?,
x if x == TypeId::of::<i8>() => write_buf_impl(buf, self, Self::write_i8)?,
x if x == TypeId::of::<u16>() => {
write_buf_impl(buf, self, Self::write_u16::<BO>)?;
}
x if x == TypeId::of::<i16>() => {
write_buf_impl(buf, self, Self::write_i16::<BO>)?;
}
x if x == TypeId::of::<u32>() => {
write_buf_impl(buf, self, Self::write_u32::<BO>)?;
}
x if x == TypeId::of::<i32>() => {
write_buf_impl(buf, self, Self::write_i32::<BO>)?;
}
x if x == TypeId::of::<u64>() => {
write_buf_impl(buf, self, Self::write_u64::<BO>)?;
}
x if x == TypeId::of::<i64>() => {
write_buf_impl(buf, self, Self::write_i64::<BO>)?;
}
x if x == TypeId::of::<f32>() => {
write_buf_impl(buf, self, Self::write_f32::<BO>)?;
}
x if x == TypeId::of::<f64>() => {
write_buf_impl(buf, self, Self::write_f64::<BO>)?;
}
_ => {}
}
writeln!(self)
}
}
impl WriteVtkImpl for String {
fn write_fmt(&mut self, args: Arguments) -> Result {
std::fmt::Write::write_fmt(self, args)?;
Ok(())
}
fn write_file_type(&mut self) -> Result {
writeln!(self, "ASCII\n").map_err(|_| Error::Header(Header::FileType))
}
fn write_cell_types<BO: ByteOrder>(&mut self, data: Vec<CellType>) -> Result {
let err = Error::DataSet(DataSetError::UnstructuredGrid(DataSetPart::CellTypes(
EntryPart::Data(None),
)));
for t in data {
writeln!(self, "{}", t as u8).map_err(|_| err)?;
}
writeln!(self).map_err(|_| err)
}
fn write_u32_vec<BO: ByteOrder>(&mut self, data: Vec<u32>) -> Result {
for i in 0..data.len() {
write!(self, "{}", data[i])?;
if i < data.len() - 1 {
// add an extra space between elements
write!(self, " ")?;
}
}
writeln!(self) // finish with a new line
}
fn write_buf<BO: ByteOrder>(&mut self, data: IOBuffer) -> Result {
writeln!(self, "{}", data)
}
}
}
pub use self::write_vtk_impl::Error;
pub trait WriteVtk: write_vtk_impl::WriteVtkImpl {
fn write_vtk(&mut self, vtk: Vtk) -> Result<&mut Self, Error> {
self.write_vtk_impl::<NativeEndian>(vtk)
}
fn write_vtk_le(&mut self, vtk: Vtk) -> Result<&mut Self, Error> {
self.write_vtk_impl::<LittleEndian>(vtk)
}
fn write_vtk_be(&mut self, vtk: Vtk) -> Result<&mut Self, Error> {
self.write_vtk_impl::<BigEndian>(vtk)
}
}
impl WriteVtk for Vec<u8> {}
impl WriteVtk for String {}