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Allows deserializing Slab without AccountTag checks #3

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merged 1 commit into from
Aug 14, 2022
Merged

Allows deserializing Slab without AccountTag checks #3

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19 changes: 19 additions & 0 deletions program/src/state/critbit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -142,6 +142,25 @@ impl<'a, C: Pod> Slab<'a, C> {
callback_infos: bytemuck::cast_slice_mut::<_, C>(callback_infos),
})
}

pub fn from_buffer_unchecked(buf: &'a mut [u8]) -> Result<Self, ProgramError> {
let callback_info_len = std::mem::size_of::<C>();
let leaf_size = LeafNode::LEN + callback_info_len;
let capacity = (buf.len() - SlabHeader::LEN - 8 - leaf_size) / (leaf_size + InnerNode::LEN);

let (_, rem) = buf.split_at_mut(8);
let (header, rem) = rem.split_at_mut(SlabHeader::LEN);
let (leaves, rem) = rem.split_at_mut((capacity + 1) * LeafNode::LEN);
let (inner_nodes, callback_infos) = rem.split_at_mut(capacity * InnerNode::LEN);
let header = bytemuck::from_bytes_mut::<SlabHeader>(header);

Ok(Self {
header,
leaf_nodes: bytemuck::cast_slice_mut::<_, LeafNode>(leaves),
inner_nodes: bytemuck::cast_slice_mut::<_, InnerNode>(inner_nodes),
callback_infos: bytemuck::cast_slice_mut::<_, C>(callback_infos),
})
}
}

impl<'a, C> Slab<'a, C> {
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