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    use crate::rust::vec::Vec;
    use crate::io;
    use super::{Deserialize, Serialize, Error, VarUint32, CountedList, InitExpr, CountedListWriter};

    #[cfg(feature="bulk")]
    const FLAG_MEMZERO: u32 = 0;
    #[cfg(feature="bulk")]
    const FLAG_PASSIVE: u32 = 1;
    #[cfg(feature="bulk")]
    const FLAG_MEM_NONZERO: u32 = 2;

    /// Entry in the element section.
    #[derive(Debug, Clone, PartialEq)]
    pub struct ElementSegment {
    	index: u32,
    	offset: Option<InitExpr>,
    	members: Vec<u32>,

    	#[cfg(feature="bulk")]
    	passive: bool,
    }

    impl ElementSegment {
    	/// New element segment.
    	pub fn new(index: u32, offset: Option<InitExpr>, members: Vec<u32>) -> Self {
    		ElementSegment {
    			index: index,
    			offset: offset,
    			members: members,

    			#[cfg(feature="bulk")]
    			passive: false,
    		}
    	}

    	/// Sequence of function indices.
    	pub fn members(&self) -> &[u32] { &self.members }

    	/// Sequence of function indices (mutable)
    	pub fn members_mut(&mut self) -> &mut Vec<u32> { &mut self.members }

    	/// Table index (currently valid only value of `0`)
    	pub fn index(&self) -> u32 { self.index }

    	/// An i32 initializer expression that computes the offset at which to place the elements.
    	///
    	/// Note that this return `None` if the segment is `passive`.
    	pub fn offset(&self) -> &Option<InitExpr> { &self.offset }

    	/// An i32 initializer expression that computes the offset at which to place the elements (mutable)
    	///
    	/// Note that this return `None` if the segment is `passive`.
    	pub fn offset_mut(&mut self) -> &mut Option<InitExpr> { &mut self.offset }
    }

    #[cfg(feature="bulk")]
    impl ElementSegment {
    	/// Whether or not this table segment is "passive"
    	pub fn passive(&self) -> bool { self.passive }

    	/// Whether or not this table segment is "passive"
    	pub fn passive_mut(&mut self) -> &mut bool { &mut self.passive }

    	/// Set whether or not this table segment is "passive"
    	pub fn set_passive(&mut self, passive: bool) {
    		self.passive = passive;
    	}
    }

    impl Deserialize for ElementSegment {
    	type Error = Error;

    	#[cfg(not(feature="bulk"))]
    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let index: u32 = VarUint32::deserialize(reader)?.into();
    		let offset = InitExpr::deserialize(reader)?;
    		let members: Vec<u32> = CountedList::<VarUint32>::deserialize(reader)?
    			.into_inner()
    			.into_iter()
    			.map(Into::into)
    			.collect();

    		Ok(ElementSegment {
    			index,
    			offset: Some(offset),
    			members,
    		})
    	}

    	#[cfg(feature="bulk")]
    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		// This piece of data was treated as `index` [of the table], but was repurposed
    		// for flags in bulk-memory operations proposal.
    		let flags: u32 = VarUint32::deserialize(reader)?.into();
    		let index = if flags == FLAG_MEMZERO || flags == FLAG_PASSIVE {
    			0u32
    		} else if flags == FLAG_MEM_NONZERO {
    			VarUint32::deserialize(reader)?.into()
    		} else {
    			return Err(Error::InvalidSegmentFlags(flags))
    		};
    		let offset = if flags == FLAG_PASSIVE {
    			None
    		} else {
    			Some(InitExpr::deserialize(reader)?)
    		};

    		let funcs: Vec<u32> = CountedList::<VarUint32>::deserialize(reader)?
    			.into_inner()
    			.into_iter()
    			.map(Into::into)
    			.collect();

    		Ok(ElementSegment {
    			index: index,
    			offset: offset,
    			members: funcs,
    			passive: flags == FLAG_PASSIVE,
    		})
    	}
    }

    impl Serialize for ElementSegment {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		#[cfg(feature="bulk")]
    		{
    			if self.passive {
    				VarUint32::from(FLAG_PASSIVE).serialize(writer)?;
    			} else if self.index != 0 {
    				VarUint32::from(FLAG_MEM_NONZERO).serialize(writer)?;
    				VarUint32::from(self.index).serialize(writer)?;
    			} else {
    				VarUint32::from(FLAG_MEMZERO).serialize(writer)?;
    			}
    		}
    		#[cfg(not(feature="bulk"))]
    		VarUint32::from(self.index).serialize(writer)?;

    		if let Some(offset) = self.offset {
    			offset.serialize(writer)?;
    		}
    		let data = self.members;
    		let counted_list = CountedListWriter::<VarUint32, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(writer)?;
    		Ok(())
    	}
    }

    /// Data segment definition.
    #[derive(Clone, Debug, PartialEq)]
    pub struct DataSegment {
    	index: u32,
    	offset: Option<InitExpr>,
    	value: Vec<u8>,

    	#[cfg(feature="bulk")]
    	passive: bool,
    }

    impl DataSegment {
    	/// New data segments.
    	pub fn new(index: u32, offset: Option<InitExpr>, value: Vec<u8>) -> Self {
    		DataSegment {
    			index: index,
    			offset: offset,
    			value: value,

    			#[cfg(feature="bulk")]
    			passive: false,
    		}
    	}

    	/// Linear memory index (currently the only valid value is `0`).
    	pub fn index(&self) -> u32 { self.index }

    	/// An i32 initializer expression that computes the offset at which to place the data.
    	///
    	/// Note that this return `None` if the segment is `passive`.
    	pub fn offset(&self) -> &Option<InitExpr> { &self.offset }

    	/// An i32 initializer expression that computes the offset at which to place the data (mutable)
    	///
    	/// Note that this return `None` if the segment is `passive`.
    	pub fn offset_mut(&mut self) -> &mut Option<InitExpr> { &mut self.offset }

    	/// Initial value of the data segment.
    	pub fn value(&self) -> &[u8] { &self.value }

    	/// Initial value of the data segment (mutable).
    	pub fn value_mut(&mut self) -> &mut Vec<u8> { &mut self.value }
    }

    #[cfg(feature="bulk")]
    impl DataSegment {
    	/// Whether or not this data segment is "passive".
    	pub fn passive(&self) -> bool { self.passive }

    	/// Whether or not this data segment is "passive" (mutable).
    	pub fn passive_mut(&mut self) -> &mut bool { &mut self.passive }

    	/// Set whether or not this table segment is "passive"
    	pub fn set_passive(&mut self, passive: bool) {
    		self.passive = passive;
    	}
    }

    impl Deserialize for DataSegment {
    	type Error = Error;

    	#[cfg(not(feature="bulk"))]
    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let index = VarUint32::deserialize(reader)?;
    		let offset = InitExpr::deserialize(reader)?;
    		let value_len = u32::from(VarUint32::deserialize(reader)?) as usize;
    		let value_buf = buffered_read!(65536, value_len, reader);

    		Ok(DataSegment {
    			index: index.into(),
    			offset: Some(offset),
    			value: value_buf,
    		})
    	}

    	#[cfg(feature="bulk")]
    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let flags: u32 = VarUint32::deserialize(reader)?.into();
    		let index = if flags == FLAG_MEMZERO || flags == FLAG_PASSIVE {
    			0u32
    		} else if flags == FLAG_MEM_NONZERO {
    			VarUint32::deserialize(reader)?.into()
    		} else {
    			return Err(Error::InvalidSegmentFlags(flags))
    		};
    		let offset = if flags == FLAG_PASSIVE {
    			None
    		} else {
    			Some(InitExpr::deserialize(reader)?)
    		};
    		let value_len = u32::from(VarUint32::deserialize(reader)?) as usize;
    		let value_buf = buffered_read!(65536, value_len, reader);

    		Ok(DataSegment {
    			index: index,
    			offset: offset,
    			value: value_buf,
    			passive: flags == FLAG_PASSIVE,
    		})
    	}
    }

    impl Serialize for DataSegment {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		#[cfg(feature="bulk")]
    		{
    			if self.passive {
    				VarUint32::from(FLAG_PASSIVE).serialize(writer)?;
    			} else if self.index != 0 {
    				VarUint32::from(FLAG_MEM_NONZERO).serialize(writer)?;
    				VarUint32::from(self.index).serialize(writer)?;
    			} else {
    				VarUint32::from(FLAG_MEMZERO).serialize(writer)?;
    			}
    		}
    		#[cfg(not(feature="bulk"))]
    		VarUint32::from(self.index).serialize(writer)?;

    		if let Some(offset) = self.offset {
    			offset.serialize(writer)?;
    		}

    		let value = self.value;
    		VarUint32::from(value.len()).serialize(writer)?;
    		writer.write(&value[..])?;
    		Ok(())
    	}
    }

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