# section.rs.html -- source
Source to the Rust file `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/parity-wasm-0.40.3/src/elements/section.rs`.
Keywords: rust, rustlang, rust-lang

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    use crate::rust::{vec::Vec, string::String, borrow::ToOwned};
    use crate::{io, elements};
    use super::{
    	Serialize,
    	Deserialize,
    	Error,
    	VarUint7,
    	VarUint32,
    	CountedList,
    	ImportEntry,
    	MemoryType,
    	TableType,
    	ExportEntry,
    	GlobalEntry,
    	Func,
    	FuncBody,
    	ElementSegment,
    	DataSegment,
    	CountedWriter,
    	CountedListWriter,
    	External,
    	serialize,
    };

    use super::types::Type;
    use super::name_section::NameSection;
    use super::reloc_section::RelocSection;

    const ENTRIES_BUFFER_LENGTH: usize = 16384;

    /// Section in the WebAssembly module.
    #[derive(Debug, Clone, PartialEq)]
    pub enum Section {
    	/// Section is unparsed.
    	Unparsed {
    		/// id of the unparsed section.
    		id: u8,
    		/// raw bytes of the unparsed section.
    		payload: Vec<u8>,
    	},
    	/// Custom section (`id=0`).
    	Custom(CustomSection),
    	/// Types section.
    	Type(TypeSection),
    	/// Import section.
    	Import(ImportSection),
    	/// Function signatures section.
    	Function(FunctionSection),
    	/// Table definition section.
    	Table(TableSection),
    	/// Memory definition section.
    	Memory(MemorySection),
    	/// Global entries section.
    	Global(GlobalSection),
    	/// Export definitions.
    	Export(ExportSection),
    	/// Entry reference of the module.
    	Start(u32),
    	/// Elements section.
    	Element(ElementSection),
    	/// Number of passive data entries in the data section
    	DataCount(u32),
    	/// Function bodies section.
    	Code(CodeSection),
    	/// Data definition section.
    	Data(DataSection),
    	/// Name section.
    	///
    	/// Note that initially it is not parsed until `parse_names` is called explicitly.
    	Name(NameSection),
    	/// Relocation section.
    	///
    	/// Note that initially it is not parsed until `parse_reloc` is called explicitly.
    	/// Also note that currently there are serialization (but not de-serialization)
    	///   issues with this section (#198).
    	Reloc(RelocSection),
    }

    impl Deserialize for Section {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let id = match VarUint7::deserialize(reader) {
    			// todo: be more selective detecting no more section
    			Err(_) => { return Err(Error::UnexpectedEof); },
    			Ok(id) => id,
    		};

    		Ok(
    			match id.into() {
    				0 => {
    					Section::Custom(CustomSection::deserialize(reader)?.into())
    				},
    				1 => {
    					Section::Type(TypeSection::deserialize(reader)?)
    				},
    				2 => {
    					Section::Import(ImportSection::deserialize(reader)?)
    				},
    				3 => {
    					Section::Function(FunctionSection::deserialize(reader)?)
    				},
    				4 => {
    					Section::Table(TableSection::deserialize(reader)?)
    				},
    				5 => {
    					Section::Memory(MemorySection::deserialize(reader)?)
    				},
    				6 => {
    					Section::Global(GlobalSection::deserialize(reader)?)
    				},
    				7 => {
    					Section::Export(ExportSection::deserialize(reader)?)
    				},
    				8 => {
    					let mut section_reader = SectionReader::new(reader)?;
    					let start_idx = VarUint32::deserialize(&mut section_reader)?;
    					section_reader.close()?;
    					Section::Start(start_idx.into())
    				},
    				9 => {
    					Section::Element(ElementSection::deserialize(reader)?)
    				},
    				10 => {
    					Section::Code(CodeSection::deserialize(reader)?)
    				},
    				11 => {
    					Section::Data(DataSection::deserialize(reader)?)
    				},
    				12 => {
    					let mut section_reader = SectionReader::new(reader)?;
    					let count = VarUint32::deserialize(&mut section_reader)?;
    					section_reader.close()?;
    					Section::DataCount(count.into())
    				},
    				invalid_id => {
    					return Err(Error::InvalidSectionId(invalid_id))
    				},
    			}
    		)
    	}
    }

    impl Serialize for Section {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		match self {
    			Section::Custom(custom_section) => {
    				VarUint7::from(0x00).serialize(writer)?;
    				custom_section.serialize(writer)?;
    			},
    			Section::Unparsed { id, payload } => {
    				VarUint7::from(id).serialize(writer)?;
    				writer.write(&payload[..])?;
    			},
    			Section::Type(type_section) => {
    				VarUint7::from(0x01).serialize(writer)?;
    				type_section.serialize(writer)?;
    			},
    			Section::Import(import_section) => {
    				VarUint7::from(0x02).serialize(writer)?;
    				import_section.serialize(writer)?;
    			},
    			Section::Function(function_section) => {
    				VarUint7::from(0x03).serialize(writer)?;
    				function_section.serialize(writer)?;
    			},
    			Section::Table(table_section) => {
    				VarUint7::from(0x04).serialize(writer)?;
    				table_section.serialize(writer)?;
    			},
    			Section::Memory(memory_section) => {
    				VarUint7::from(0x05).serialize(writer)?;
    				memory_section.serialize(writer)?;
    			},
    			Section::Global(global_section) => {
    				VarUint7::from(0x06).serialize(writer)?;
    				global_section.serialize(writer)?;
    			},
    			Section::Export(export_section) => {
    				VarUint7::from(0x07).serialize(writer)?;
    				export_section.serialize(writer)?;
    			},
    			Section::Start(index) => {
    				VarUint7::from(0x08).serialize(writer)?;
    				let mut counted_writer = CountedWriter::new(writer);
    				VarUint32::from(index).serialize(&mut counted_writer)?;
    				counted_writer.done()?;
    			},
    			Section::DataCount(count) => {
    				VarUint7::from(0x0c).serialize(writer)?;
    				let mut counted_writer = CountedWriter::new(writer);
    				VarUint32::from(count).serialize(&mut counted_writer)?;
    				counted_writer.done()?;
    			},
    			Section::Element(element_section) => {
    				VarUint7::from(0x09).serialize(writer)?;
    				element_section.serialize(writer)?;
    			},
    			Section::Code(code_section) => {
    				VarUint7::from(0x0a).serialize(writer)?;
    				code_section.serialize(writer)?;
    			},
    			Section::Data(data_section) => {
    				VarUint7::from(0x0b).serialize(writer)?;
    				data_section.serialize(writer)?;
    			},
    			Section::Name(name_section) => {
    				VarUint7::from(0x00).serialize(writer)?;
    				let custom = CustomSection {
    					name: "name".to_owned(),
    					payload: serialize(name_section)?,
    				};
    				custom.serialize(writer)?;
    			},
    			Section::Reloc(reloc_section) => {
    				VarUint7::from(0x00).serialize(writer)?;
    				reloc_section.serialize(writer)?;
    			},
    		}
    		Ok(())
    	}
    }

    impl Section {
    	pub(crate) fn order(&self) -> u8 {
    		match *self {
    			Section::Custom(_) => 0x00,
    			Section::Unparsed { .. } => 0x00,
    			Section::Type(_) => 0x1,
    			Section::Import(_) => 0x2,
    			Section::Function(_) => 0x3,
    			Section::Table(_) => 0x4,
    			Section::Memory(_) => 0x5,
    			Section::Global(_) => 0x6,
    			Section::Export(_) => 0x7,
    			Section::Start(_) => 0x8,
    			Section::Element(_) => 0x9,
    			Section::DataCount(_) => 0x0a,
    			Section::Code(_) => 0x0b,
    			Section::Data(_) => 0x0c,
    			Section::Name(_) => 0x00,
    			Section::Reloc(_) => 0x00,
    		}
    	}
    }

    pub(crate) struct SectionReader {
    	cursor: io::Cursor<Vec<u8>>,
    	declared_length: usize,
    }

    impl SectionReader {
    	pub fn new<R: io::Read>(reader: &mut R) -> Result<Self, elements::Error> {
    		let length = u32::from(VarUint32::deserialize(reader)?) as usize;
    		let inner_buffer = buffered_read!(ENTRIES_BUFFER_LENGTH, length, reader);
    		let buf_length = inner_buffer.len();
    		let cursor = io::Cursor::new(inner_buffer);

    		Ok(SectionReader {
    			cursor: cursor,
    			declared_length: buf_length,
    		})
    	}

    	pub fn close(self) -> Result<(), io::Error> {
    		let cursor = self.cursor;
    		let buf_length = self.declared_length;

    		if cursor.position() != buf_length {
    			Err(io::Error::InvalidData)
    		} else {
    			Ok(())
    		}
    	}
    }

    impl io::Read for SectionReader {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<()> {
    		self.cursor.read(buf)?;
    		Ok(())
    	}
    }

    fn read_entries<R: io::Read, T: Deserialize<Error=elements::Error>>(reader: &mut R)
    	-> Result<Vec<T>, elements::Error>
    {
    	let mut section_reader = SectionReader::new(reader)?;
    	let result = CountedList::<T>::deserialize(&mut section_reader)?.into_inner();
    	section_reader.close()?;
    	Ok(result)
    }

    /// Custom section.
    #[derive(Debug, Default, Clone, PartialEq)]
    pub struct CustomSection {
    	name: String,
    	payload: Vec<u8>,
    }

    impl CustomSection {
    	/// Creates a new custom section with the given name and payload.
    	pub fn new(name: String, payload: Vec<u8>) -> CustomSection {
    		CustomSection { name, payload }
    	}

    	/// Name of the custom section.
    	pub fn name(&self) -> &str {
    		&self.name
    	}

    	/// Payload of the custom section.
    	pub fn payload(&self) -> &[u8] {
    		&self.payload
    	}

    	/// Name of the custom section (mutable).
    	pub fn name_mut(&mut self) -> &mut String {
    		&mut self.name
    	}

    	/// Payload of the custom section (mutable).
    	pub fn payload_mut(&mut self) -> &mut Vec<u8> {
    		&mut self.payload
    	}
    }

    impl Deserialize for CustomSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let section_length: usize = u32::from(VarUint32::deserialize(reader)?) as usize;
    		let buf = buffered_read!(16384, section_length, reader);
    		let mut cursor = io::Cursor::new(&buf[..]);
    		let name = String::deserialize(&mut cursor)?;
    		let payload = buf[cursor.position() as usize..].to_vec();
    		Ok(CustomSection { name: name, payload: payload })
    	}
    }

    impl Serialize for CustomSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		use io::Write;

    		let mut counted_writer = CountedWriter::new(writer);
    		self.name.serialize(&mut counted_writer)?;
    		counted_writer.write(&self.payload[..])?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Section with type declarations.
    #[derive(Debug, Default, Clone, PartialEq)]
    pub struct TypeSection(Vec<Type>);

    impl TypeSection {
    	///  New type section with provided types.
    	pub fn with_types(types: Vec<Type>) -> Self {
    		TypeSection(types)
    	}

    	/// List of type declarations.
    	pub fn types(&self) -> &[Type] {
    		&self.0
    	}

    	/// List of type declarations (mutable).
    	pub fn types_mut(&mut self) -> &mut Vec<Type> {
    		&mut self.0
    	}
    }

    impl Deserialize for TypeSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(TypeSection(read_entries(reader)?))
    	}
    }

    impl Serialize for TypeSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<Type, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Section of the imports definition.
    #[derive(Debug, Default, Clone, PartialEq)]
    pub struct ImportSection(Vec<ImportEntry>);

    impl ImportSection {
    	///  New import section with provided types.
    	pub fn with_entries(entries: Vec<ImportEntry>) -> Self {
    		ImportSection(entries)
    	}

    	/// List of import entries.
    	pub fn entries(&self) -> &[ImportEntry] {
    		&self.0
    	}

    	/// List of import entries (mutable).
    	pub fn entries_mut(&mut self) -> &mut Vec<ImportEntry> {
    		&mut self.0
    	}

    	/// Returns number of functions.
    	pub fn functions(&self) -> usize {
    		self.0.iter()
    			.filter(|entry| match entry.external() { &External::Function(_) => true, _ => false })
    			.count()
    	}

    	/// Returns number of globals
    	pub fn globals(&self) -> usize {
    		self.0.iter()
    			.filter(|entry| match entry.external() { &External::Global(_) => true, _ => false })
    			.count()
    	}
    }

    impl Deserialize for ImportSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(ImportSection(read_entries(reader)?))
    	}
    }

    impl Serialize for ImportSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<ImportEntry, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Section with function signatures definition.
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct FunctionSection(Vec<Func>);

    impl FunctionSection {
    	///  New function signatures section with provided entries.
    	pub fn with_entries(entries: Vec<Func>) -> Self {
    		FunctionSection(entries)
    	}

    	/// List of all functions in the section, mutable.
    	pub fn entries_mut(&mut self) -> &mut Vec<Func> {
    		&mut self.0
    	}

    	/// List of all functions in the section.
    	pub fn entries(&self) -> &[Func] {
    		&self.0
    	}
    }

    impl Deserialize for FunctionSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(FunctionSection(read_entries(reader)?))
    	}
    }

    impl Serialize for FunctionSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<VarUint32, _>(
    			data.len(),
    			data.into_iter().map(|func| func.type_ref().into())
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Section with table definition (currently only one is allowed).
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct TableSection(Vec<TableType>);

    impl TableSection {
    	/// Table entries.
    	pub fn entries(&self) -> &[TableType] {
    		&self.0
    	}

    	///  New table section with provided table entries.
    	pub fn with_entries(entries: Vec<TableType>) -> Self {
    		TableSection(entries)
    	}

    	/// Mutable table entries.
    	pub fn entries_mut(&mut self) -> &mut Vec<TableType> {
    		&mut self.0
    	}
    }

    impl Deserialize for TableSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(TableSection(read_entries(reader)?))
    	}
    }

    impl Serialize for TableSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<TableType, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Section with table definition (currently only one entry is allowed).
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct MemorySection(Vec<MemoryType>);

    impl MemorySection {
    	/// List of all memory entries in the section
    	pub fn entries(&self) -> &[MemoryType] {
    		&self.0
    	}

    	///  New memory section with memory types.
    	pub fn with_entries(entries: Vec<MemoryType>) -> Self {
    		MemorySection(entries)
    	}

    	/// Mutable list of all memory entries in the section.
    	pub fn entries_mut(&mut self) -> &mut Vec<MemoryType> {
    		&mut self.0
    	}
    }

    impl Deserialize for MemorySection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(MemorySection(read_entries(reader)?))
    	}
    }

    impl Serialize for MemorySection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<MemoryType, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Globals definition section.
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct GlobalSection(Vec<GlobalEntry>);

    impl GlobalSection {
    	/// List of all global entries in the section.
    	pub fn entries(&self) -> &[GlobalEntry] {
    		&self.0
    	}

    	/// New global section from list of global entries.
    	pub fn with_entries(entries: Vec<GlobalEntry>) -> Self {
    		GlobalSection(entries)
    	}

    	/// List of all global entries in the section (mutable).
    	pub fn entries_mut(&mut self) -> &mut Vec<GlobalEntry> {
    		&mut self.0
    	}
    }

    impl Deserialize for GlobalSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(GlobalSection(read_entries(reader)?))
    	}
    }

    impl Serialize for GlobalSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<GlobalEntry, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// List of exports definition.
    #[derive(Debug, Default, Clone, PartialEq)]
    pub struct ExportSection(Vec<ExportEntry>);

    impl ExportSection {
    	/// List of all export entries in the section.
    	pub fn entries(&self) -> &[ExportEntry] {
    		&self.0
    	}

    	/// New export section from list of export entries.
    	pub fn with_entries(entries: Vec<ExportEntry>) -> Self {
    		ExportSection(entries)
    	}

    	/// List of all export entries in the section (mutable).
    	pub fn entries_mut(&mut self) -> &mut Vec<ExportEntry> {
    		&mut self.0
    	}
    }

    impl Deserialize for ExportSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(ExportSection(read_entries(reader)?))
    	}
    }

    impl Serialize for ExportSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<ExportEntry, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Section with function bodies of the module.
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct CodeSection(Vec<FuncBody>);

    impl CodeSection {
    	/// New code section with specified function bodies.
    	pub fn with_bodies(bodies: Vec<FuncBody>) -> Self {
    		CodeSection(bodies)
    	}

    	/// All function bodies in the section.
    	pub fn bodies(&self) -> &[FuncBody] {
    		&self.0
    	}

    	/// All function bodies in the section, mutable.
    	pub fn bodies_mut(&mut self) -> &mut Vec<FuncBody> {
    		&mut self.0
    	}
    }

    impl Deserialize for CodeSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(CodeSection(read_entries(reader)?))
    	}
    }

    impl Serialize for CodeSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<FuncBody, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Element entries section.
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct ElementSection(Vec<ElementSegment>);

    impl ElementSection {
    	/// New elements section.
    	pub fn with_entries(entries: Vec<ElementSegment>) -> Self {
    		ElementSection(entries)
    	}

    	/// New elements entries in the section.
    	pub fn entries(&self) -> &[ElementSegment] {
    		&self.0
    	}

    	/// List of all data entries in the section (mutable).
    	pub fn entries_mut(&mut self) -> &mut Vec<ElementSegment> {
    		&mut self.0
    	}
    }

    impl Deserialize for ElementSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(ElementSection(read_entries(reader)?))
    	}
    }

    impl Serialize for ElementSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<ElementSegment, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    /// Data entries definitions.
    #[derive(Default, Debug, Clone, PartialEq)]
    pub struct DataSection(Vec<DataSegment>);

    impl DataSection {
    	/// New data section.
    	pub fn with_entries(entries: Vec<DataSegment>) -> Self {
    		DataSection(entries)
    	}

    	/// List of all data entries in the section.
    	pub fn entries(&self) -> &[DataSegment] {
    		&self.0
    	}

    	/// List of all data entries in the section (mutable).
    	pub fn entries_mut(&mut self) -> &mut Vec<DataSegment> {
    		&mut self.0
    	}
    }

    impl Deserialize for DataSection {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(DataSection(read_entries(reader)?))
    	}
    }

    impl Serialize for DataSection {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let mut counted_writer = CountedWriter::new(writer);
    		let data = self.0;
    		let counted_list = CountedListWriter::<DataSegment, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(&mut counted_writer)?;
    		counted_writer.done()?;
    		Ok(())
    	}
    }

    #[cfg(test)]
    mod tests {

    	use super::super::{
    		deserialize_buffer, deserialize_file, ValueType, InitExpr, DataSegment,
    		serialize, ElementSegment, Instructions, BlockType, Local, FuncBody,
    	};
    	use super::{Section, TypeSection, Type, DataSection, ElementSection, CodeSection};

    	#[test]
    	fn import_section() {
    		let module = deserialize_file("./res/cases/v1/test5.wasm").expect("Should be deserialized");
    		let mut found = false;
    		for section in module.sections() {
    			match section {
    				&Section::Import(ref import_section) => {
    					assert_eq!(25, import_section.entries().len());
    					found = true
    				},
    				_ => { }
    			}
    		}
    		assert!(found, "There should be import section in test5.wasm");
    	}

    	fn functions_test_payload() -> &'static [u8] {
    		&[
    			// functions section id
    			0x03u8,
    			// functions section length
    			0x87, 0x80, 0x80, 0x80, 0x0,
    			// number of functions
    			0x04,
    			// type reference 1
    			0x01,
    			// type reference 2
    			0x86, 0x80, 0x00,
    			// type reference 3
    			0x09,
    			// type reference 4
    			0x33
    		]
    	}

    	#[test]
    	fn fn_section_detect() {
    		let section: Section =
    			deserialize_buffer(functions_test_payload()).expect("section to be deserialized");

    		match section {
    			Section::Function(_) => {},
    			_ => {
    				panic!("Payload should be recognized as functions section")
    			}
    		}
    	}

    	#[test]
    	fn fn_section_number() {
    		let section: Section =
    			deserialize_buffer(functions_test_payload()).expect("section to be deserialized");

    		match section {
    			Section::Function(fn_section) => {
    				assert_eq!(4, fn_section.entries().len(), "There should be 4 functions total");
    			},
    			_ => {
    				// will be catched by dedicated test
    			}
    		}
    	}

    	#[test]
    	fn fn_section_ref() {
    		let section: Section =
    			deserialize_buffer(functions_test_payload()).expect("section to be deserialized");

    		match section {
    			Section::Function(fn_section) => {
    				assert_eq!(6, fn_section.entries()[1].type_ref());
    			},
    			_ => {
    				// will be catched by dedicated test
    			}
    		}
    	}

    	fn types_test_payload() -> &'static [u8] {
    		&[
    			// section length
    			11,

    			// 2 functions
    			2,
    			// func 1, form =1
    			0x60,
    			// param_count=1
    			1,
    				// first param
    				0x7e, // i64
    			// no return params
    			0x00,

    			// func 2, form=1
    			0x60,
    			// param_count=2
    			2,
    				// first param
    				0x7e,
    				// second param
    				0x7d,
    			// return param (is_present, param_type)
    			0x01, 0x7e
    		]
    	}

    	#[test]
    	fn type_section_len() {
    		let type_section: TypeSection =
    			deserialize_buffer(types_test_payload()).expect("type_section be deserialized");

    		assert_eq!(type_section.types().len(), 2);
    	}

    	#[test]
    	fn type_section_infer() {
    		let type_section: TypeSection =
    			deserialize_buffer(types_test_payload()).expect("type_section be deserialized");

    		let t1 = match &type_section.types()[1] {
    			&Type::Function(ref func_type) => func_type
    		};

    		assert_eq!(Some(ValueType::I64), t1.return_type());
    		assert_eq!(2, t1.params().len());
    	}

    	fn export_payload() -> &'static [u8] {
    		&[
    			// section id
    			0x07,
    			// section length
    			28,
    			// 6 entries
    			6,
    			// func "A", index 6
    			// [name_len(1-5 bytes), name_bytes(name_len, internal_kind(1byte), internal_index(1-5 bytes)])
    			0x01, 0x41,  0x01, 0x86, 0x80, 0x00,
    			// func "B", index 8
    			0x01, 0x42,  0x01, 0x86, 0x00,
    			// func "C", index 7
    			0x01, 0x43,  0x01, 0x07,
    			// memory "D", index 0
    			0x01, 0x44,  0x02, 0x00,
    			// func "E", index 1
    			0x01, 0x45,  0x01, 0x01,
    			// func "F", index 2
    			0x01, 0x46,  0x01, 0x02
    		]
    	}

    	#[test]
    	fn export_detect() {
    		let section: Section =
    			deserialize_buffer(export_payload()).expect("section to be deserialized");

    		match section {
    			Section::Export(_) => {},
    			_ => {
    				panic!("Payload should be recognized as export section")
    			}
    		}
    	}

    	fn code_payload() -> &'static [u8] {
    		&[
    			// sectionid
    			0x0Au8,
    			// section length, 32
    			0x20,
    			// body count
    			0x01,
    			// body 1, length 30
    			0x1E,
    			0x01, 0x01, 0x7F, // local i32 (one collection of length one of type i32)
    			0x02, 0x7F, // block i32
    				0x23, 0x00, // get_global 0
    				0x21, 0x01, // set_local 1
    				0x23, 0x00, // get_global 0
    				0x20, 0x00, // get_local 0
    				0x6A,       // i32.add
    				0x24, 0x00, // set_global 0
    				0x23, 0x00, // get_global 0
    				0x41, 0x0F, // i32.const 15
    				0x6A,       // i32.add
    				0x41, 0x70, // i32.const -16
    				0x71,       // i32.and
    				0x24, 0x00, // set_global 0
    				0x20, 0x01, // get_local 1
    			0x0B,
    			0x0B,
    		]
    	}

    	#[test]
    	fn code_detect() {

    		let section: Section =
    			deserialize_buffer(code_payload()).expect("section to be deserialized");

    		match section {
    			Section::Code(_) => {},
    			_ => {
    				panic!("Payload should be recognized as a code section")
    			}
    		}
    	}

    	fn data_payload() -> &'static [u8] {
    		&[
    			0x0bu8,  // section id
    			20,      // 20 bytes overall
    			0x01,    // number of segments
    			0x00,    // index
    			0x0b,    // just `end` op
    			0x10,
    			// 16x 0x00
    			0x00, 0x00, 0x00, 0x00,
    			0x00, 0x00, 0x00, 0x00,
    			0x00, 0x00, 0x00, 0x00,
    			0x00, 0x00, 0x00, 0x00
    		]
    	}

    	#[test]
    	fn data_section_ser() {
    		let data_section = DataSection::with_entries(
    			vec![DataSegment::new(0u32, Some(InitExpr::empty()), vec![0u8; 16])]
    		);

    		let buf = serialize(data_section).expect("Data section to be serialized");

    		assert_eq!(buf, vec![
    			20u8, // 19 bytes overall
    			0x01, // number of segments
    			0x00, // index
    			0x0b, // just `end` op
    			16,   // value of length 16
    			0x00, 0x00, 0x00, 0x00, // 16x 0x00 as in initialization
    			0x00, 0x00, 0x00, 0x00,
    			0x00, 0x00, 0x00, 0x00,
    			0x00, 0x00, 0x00, 0x00
    		]);
    	}

    	#[test]
    	fn data_section_detect() {
    		let section: Section =
    			deserialize_buffer(data_payload()).expect("section to be deserialized");

    		match section {
    			Section::Data(_) => {},
    			_ => {
    				panic!("Payload should be recognized as a data section")
    			}
    		}
    	}

    	#[test]
    	fn element_section_ser() {
    		let element_section = ElementSection::with_entries(
    			vec![ElementSegment::new(0u32, Some(InitExpr::empty()), vec![0u32; 4])]
    		);

    		let buf = serialize(element_section).expect("Element section to be serialized");

    		assert_eq!(buf, vec![
    			08u8, // 8 bytes overall
    			0x01, // number of segments
    			0x00, // index
    			0x0b, // just `end` op
    			0x04, // 4 elements
    			0x00, 0x00, 0x00, 0x00 // 4x 0x00 as in initialization
    		]);
    	}

    	#[test]
    	fn code_section_ser() {
    		use super::super::Instruction::*;

    		let code_section = CodeSection::with_bodies(
    			vec![
    				FuncBody::new(
    					vec![Local::new(1, ValueType::I32)],
    					Instructions::new(vec![
    						Block(BlockType::Value(ValueType::I32)),
    						GetGlobal(0),
    						End,
    						End,
    					])
    				)
    			]);

    		let buf = serialize(code_section).expect("Code section to be serialized");

    		assert_eq!(buf, vec![
    			11u8,            // 11 bytes total section size
    			0x01,            // 1 function
    			  9,             //   function #1 total code size
    			  1,             //   1 local variable declaration
    			  1,             //      amount of variables
    			  0x7f,          //      type of variable (7-bit, -0x01), negative
    			  0x02,          //   block
    				0x7f,        //      block return type (7-bit, -0x01), negative
    				0x23, 0x00,  //      get_global(0)
    				0x0b,        //   block end
    			0x0b,            // function end
    		]);
    	}

    	#[test]
    	fn start_section() {
    		let section: Section = deserialize_buffer(&[08u8, 01u8, 00u8]).expect("Start section to deserialize");
    		if let Section::Start(_) = section {
    		} else {
    			panic!("Payload should be a start section");
    		}

    		let serialized = serialize(section).expect("Start section to successfully serializen");

    		assert_eq!(serialized, vec![08u8, 01u8, 00u8]);
    	}
    }

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