use std::mem;
use crate::context::Context;
use crate::endianness::Endianness;
use crate::writable::Writable;
use crate::varint::VarInt64;
pub trait Writer< C: Context > {
fn write_bytes( &mut self, slice: &[u8] ) -> Result< (), C::Error >;
fn context( &self ) -> &C;
fn context_mut( &mut self ) -> &mut C;
#[inline(always)]
fn can_write_at_least( &self, _size: usize ) -> Option< bool > {
None
}
#[inline(always)]
fn write_u8( &mut self, value: u8 ) -> Result< (), C::Error > {
let slice = unsafe { std::slice::from_raw_parts( &value, 1 ) };
self.write_bytes( slice )
}
#[inline(always)]
fn write_u16( &mut self, mut value: u16 ) -> Result< (), C::Error > {
self.context().endianness().swap_u16( &mut value );
let slice = unsafe { std::slice::from_raw_parts( &value as *const u16 as *const u8, 2 ) };
self.write_bytes( slice )
}
#[inline(always)]
fn write_u32( &mut self, mut value: u32 ) -> Result< (), C::Error > {
self.context().endianness().swap_u32( &mut value );
let slice = unsafe { std::slice::from_raw_parts( &value as *const u32 as *const u8, 4 ) };
self.write_bytes( slice )
}
#[inline(always)]
fn write_u64( &mut self, mut value: u64 ) -> Result< (), C::Error > {
self.context().endianness().swap_u64( &mut value );
let slice = unsafe { std::slice::from_raw_parts( &value as *const u64 as *const u8, 8 ) };
self.write_bytes( slice )
}
#[inline(always)]
fn write_u128( &mut self, mut value: u128 ) -> Result< (), C::Error > {
self.context().endianness().swap_u128( &mut value );
let slice = unsafe { std::slice::from_raw_parts( &value as *const u128 as *const u8, 16 ) };
self.write_bytes( slice )
}
#[inline(always)]
fn write_i8( &mut self, value: i8 ) -> Result< (), C::Error > {
self.write_u8( value as u8 )
}
#[inline(always)]
fn write_i16( &mut self, value: i16 ) -> Result< (), C::Error > {
self.write_u16( value as u16 )
}
#[inline(always)]
fn write_i32( &mut self, value: i32 ) -> Result< (), C::Error > {
self.write_u32( value as u32 )
}
#[inline(always)]
fn write_i64( &mut self, value: i64 ) -> Result< (), C::Error > {
self.write_u64( value as u64 )
}
#[inline(always)]
fn write_i128( &mut self, value: i128 ) -> Result< (), C::Error > {
self.write_u128( value as u128 )
}
#[inline(always)]
fn write_f32( &mut self, value: f32 ) -> Result< (), C::Error > {
self.write_u32( value.to_bits() )
}
#[inline(always)]
fn write_f64( &mut self, value: f64 ) -> Result< (), C::Error > {
self.write_u64( value.to_bits() )
}
#[inline(always)]
fn endianness( &self ) -> Endianness {
self.context().endianness()
}
#[inline(always)]
fn write_value< T: Writable< C > >( &mut self, item: &T ) -> Result< (), C::Error > {
item.write_to( self )
}
#[inline]
fn write_slice< T >( &mut self, slice: &[T] ) -> Result< (), C::Error >
where T: Writable< C >
{
if T::speedy_is_primitive() && (mem::size_of::< T >() == 1 || !self.endianness().conversion_necessary()) {
let bytes = unsafe { T::speedy_slice_as_bytes( slice ) };
self.write_bytes( bytes )
} else {
for value in slice {
self.write_value( value )?;
}
Ok(())
}
}
#[inline]
fn write_collection< T >( &mut self, collection: impl IntoIterator< Item = T > ) -> Result< (), C::Error >
where T: Writable< C >
{
for item in collection {
item.write_to( self )?;
}
Ok(())
}
#[inline]
fn write_u64_varint( &mut self, value: u64 ) -> Result< (), C::Error > {
VarInt64::from( value ).write_to( self )
}
}