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< / pre > < pre class = "rust " >
< span class = "doccomment" > //! This is code from [Tungstenite project](https://github.com/snapview/tungstenite-rs)< / span >
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< span class = "attribute" > #![< span class = "ident" > cfg_attr< / span > (< span class = "ident" > feature< / span > < span class = "op" > =< / span > < span class = "string" > " cargo-clippy" < / span > , < span class = "ident" > allow< / span > (< span class = "ident" > clippy< / span > ::< span class = "ident" > cast_ptr_alignment< / span > ))]< / span >
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< span class = "kw" > use< / span > < span class = "ident" > std< / span > ::< span class = "ident" > ptr< / span > ::< span class = "ident" > copy_nonoverlapping< / span > ;
< span class = "kw" > use< / span > < span class = "ident" > std< / span > ::< span class = "ident" > slice< / span > ;
< span class = "comment" > // Holds a slice guaranteed to be shorter than 8 bytes< / span >
< span class = "kw" > struct< / span > < span class = "ident" > ShortSlice< / span > < span class = "op" > < < / span > < span class = "lifetime" > ' a< / span > < span class = "op" > > < / span > (< span class = "kw-2" > & < / span > < span class = "lifetime" > ' a< / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u8< / span > ]);
< span class = "kw" > impl< / span > < span class = "op" > < < / span > < span class = "lifetime" > ' a< / span > < span class = "op" > > < / span > < span class = "ident" > ShortSlice< / span > < span class = "op" > < < / span > < span class = "lifetime" > ' a< / span > < span class = "op" > > < / span > {
< span class = "kw" > unsafe< / span > < span class = "kw" > fn< / span > < span class = "ident" > new< / span > (< span class = "ident" > slice< / span > : < span class = "kw-2" > & < / span > < span class = "lifetime" > ' a< / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u8< / span > ]) < span class = "op" > -> < / span > < span class = "self" > Self< / span > {
< span class = "comment" > // Sanity check for debug builds< / span >
< span class = "macro" > debug_assert< / span > < span class = "macro" > !< / span > (< span class = "ident" > slice< / span > .< span class = "ident" > len< / span > () < span class = "op" > < < / span > < span class = "number" > 8< / span > );
< span class = "ident" > ShortSlice< / span > (< span class = "ident" > slice< / span > )
}
< span class = "kw" > fn< / span > < span class = "ident" > len< / span > (< span class = "kw-2" > & < / span > < span class = "self" > self< / span > ) < span class = "op" > -> < / span > < span class = "ident" > usize< / span > {
< span class = "self" > self< / span > .< span class = "number" > 0< / span > .< span class = "ident" > len< / span > ()
}
}
< span class = "doccomment" > /// Faster version of `apply_mask()` which operates on 8-byte blocks.< / span >
< span class = "attribute" > #[< span class = "ident" > inline< / span > ]< / span >
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< span class = "attribute" > #[< span class = "ident" > cfg_attr< / span > (< span class = "ident" > feature< / span > < span class = "op" > =< / span > < span class = "string" > " cargo-clippy" < / span > , < span class = "ident" > allow< / span > (< span class = "ident" > clippy< / span > ::< span class = "ident" > cast_lossless< / span > ))]< / span >
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< span class = "kw" > pub< / span > (< span class = "kw" > crate< / span > ) < span class = "kw" > fn< / span > < span class = "ident" > apply_mask< / span > (< span class = "ident" > buf< / span > : < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u8< / span > ], < span class = "ident" > mask_u32< / span > : < span class = "ident" > u32< / span > ) {
< span class = "comment" > // Extend the mask to 64 bits< / span >
< span class = "kw" > let< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > mask_u64< / span > < span class = "op" > =< / span > ((< span class = "ident" > mask_u32< / span > < span class = "kw" > as< / span > < span class = "ident" > u64< / span > ) < span class = "op" > < < < / span > < span class = "number" > 32< / span > ) < span class = "op" > |< / span > (< span class = "ident" > mask_u32< / span > < span class = "kw" > as< / span > < span class = "ident" > u64< / span > );
< span class = "comment" > // Split the buffer into three segments< / span >
< span class = "kw" > let< / span > (< span class = "ident" > head< / span > , < span class = "ident" > mid< / span > , < span class = "ident" > tail< / span > ) < span class = "op" > =< / span > < span class = "ident" > align_buf< / span > (< span class = "ident" > buf< / span > );
< span class = "comment" > // Initial unaligned segment< / span >
< span class = "kw" > let< / span > < span class = "ident" > head_len< / span > < span class = "op" > =< / span > < span class = "ident" > head< / span > .< span class = "ident" > len< / span > ();
< span class = "kw" > if< / span > < span class = "ident" > head_len< / span > < span class = "op" > > < / span > < span class = "number" > 0< / span > {
< span class = "ident" > xor_short< / span > (< span class = "ident" > head< / span > , < span class = "ident" > mask_u64< / span > );
< span class = "kw" > if< / span > < span class = "macro" > cfg< / span > < span class = "macro" > !< / span > (< span class = "ident" > target_endian< / span > < span class = "op" > =< / span > < span class = "string" > " big" < / span > ) {
< span class = "ident" > mask_u64< / span > < span class = "op" > =< / span > < span class = "ident" > mask_u64< / span > .< span class = "ident" > rotate_left< / span > (< span class = "number" > 8< / span > < span class = "op" > *< / span > < span class = "ident" > head_len< / span > < span class = "kw" > as< / span > < span class = "ident" > u32< / span > );
} < span class = "kw" > else< / span > {
< span class = "ident" > mask_u64< / span > < span class = "op" > =< / span > < span class = "ident" > mask_u64< / span > .< span class = "ident" > rotate_right< / span > (< span class = "number" > 8< / span > < span class = "op" > *< / span > < span class = "ident" > head_len< / span > < span class = "kw" > as< / span > < span class = "ident" > u32< / span > );
}
}
< span class = "comment" > // Aligned segment< / span >
< span class = "kw" > for< / span > < span class = "ident" > v< / span > < span class = "kw" > in< / span > < span class = "ident" > mid< / span > {
< span class = "kw-2" > *< / span > < span class = "ident" > v< / span > < span class = "op" > ^=< / span > < span class = "ident" > mask_u64< / span > ;
}
< span class = "comment" > // Final unaligned segment< / span >
< span class = "kw" > if< / span > < span class = "ident" > tail< / span > .< span class = "ident" > len< / span > () < span class = "op" > > < / span > < span class = "number" > 0< / span > {
< span class = "ident" > xor_short< / span > (< span class = "ident" > tail< / span > , < span class = "ident" > mask_u64< / span > );
}
}
< span class = "attribute" > #[< span class = "ident" > inline< / span > ]< / span >
< span class = "comment" > // TODO: copy_nonoverlapping here compiles to call memcpy. While it is not so< / span >
< span class = "comment" > // inefficient, it could be done better. The compiler does not understand that< / span >
< span class = "comment" > // a `ShortSlice` must be smaller than a u64.< / span >
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< span class = "attribute" > #[< span class = "ident" > cfg_attr< / span > (
< span class = "ident" > feature< / span > < span class = "op" > =< / span > < span class = "string" > " cargo-clippy" < / span > ,
< span class = "ident" > allow< / span > (< span class = "ident" > clippy< / span > ::< span class = "ident" > needless_pass_by_value< / span > )
)]< / span >
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< span class = "kw" > fn< / span > < span class = "ident" > xor_short< / span > (< span class = "ident" > buf< / span > : < span class = "ident" > ShortSlice< / span > , < span class = "ident" > mask< / span > : < span class = "ident" > u64< / span > ) {
< span class = "comment" > // Unsafe: we know that a `ShortSlice` fits in a u64< / span >
< span class = "kw" > unsafe< / span > {
< span class = "kw" > let< / span > (< span class = "ident" > ptr< / span > , < span class = "ident" > len< / span > ) < span class = "op" > =< / span > (< span class = "ident" > buf< / span > .< span class = "number" > 0< / span > .< span class = "ident" > as_mut_ptr< / span > (), < span class = "ident" > buf< / span > .< span class = "number" > 0< / span > .< span class = "ident" > len< / span > ());
< span class = "kw" > let< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > b< / span > : < span class = "ident" > u64< / span > < span class = "op" > =< / span > < span class = "number" > 0< / span > ;
< span class = "attribute" > #[< span class = "ident" > allow< / span > (< span class = "ident" > trivial_casts< / span > )]< / span >
< span class = "ident" > copy_nonoverlapping< / span > (< span class = "ident" > ptr< / span > , < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > < span class = "ident" > b< / span > < span class = "kw" > as< / span > < span class = "kw-2" > *< / span > < span class = "kw-2" > mut< / span > < span class = "kw" > _< / span > < span class = "kw" > as< / span > < span class = "kw-2" > *< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > u8< / span > , < span class = "ident" > len< / span > );
< span class = "ident" > b< / span > < span class = "op" > ^=< / span > < span class = "ident" > mask< / span > ;
< span class = "attribute" > #[< span class = "ident" > allow< / span > (< span class = "ident" > trivial_casts< / span > )]< / span >
< span class = "ident" > copy_nonoverlapping< / span > (< span class = "kw-2" > & < / span > < span class = "ident" > b< / span > < span class = "kw" > as< / span > < span class = "kw-2" > *< / span > < span class = "kw" > const< / span > < span class = "kw" > _< / span > < span class = "kw" > as< / span > < span class = "kw-2" > *< / span > < span class = "kw" > const< / span > < span class = "ident" > u8< / span > , < span class = "ident" > ptr< / span > , < span class = "ident" > len< / span > );
}
}
< span class = "attribute" > #[< span class = "ident" > inline< / span > ]< / span >
< span class = "comment" > // Unsafe: caller must ensure the buffer has the correct size and alignment< / span >
< span class = "kw" > unsafe< / span > < span class = "kw" > fn< / span > < span class = "ident" > cast_slice< / span > (< span class = "ident" > buf< / span > : < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u8< / span > ]) < span class = "op" > -> < / span > < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u64< / span > ] {
< span class = "comment" > // Assert correct size and alignment in debug builds< / span >
< span class = "macro" > debug_assert< / span > < span class = "macro" > !< / span > (< span class = "ident" > buf< / span > .< span class = "ident" > len< / span > ().< span class = "ident" > trailing_zeros< / span > () < span class = "op" > > =< / span > < span class = "number" > 3< / span > );
< span class = "macro" > debug_assert< / span > < span class = "macro" > !< / span > ((< span class = "ident" > buf< / span > .< span class = "ident" > as_ptr< / span > () < span class = "kw" > as< / span > < span class = "ident" > usize< / span > ).< span class = "ident" > trailing_zeros< / span > () < span class = "op" > > =< / span > < span class = "number" > 3< / span > );
< span class = "ident" > slice< / span > ::< span class = "ident" > from_raw_parts_mut< / span > (< span class = "ident" > buf< / span > .< span class = "ident" > as_mut_ptr< / span > () < span class = "kw" > as< / span > < span class = "kw-2" > *< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > u64< / span > , < span class = "ident" > buf< / span > .< span class = "ident" > len< / span > () < span class = "op" > > > < / span > < span class = "number" > 3< / span > )
}
< span class = "attribute" > #[< span class = "ident" > inline< / span > ]< / span >
< span class = "comment" > // Splits a slice into three parts: an unaligned short head and tail, plus an aligned< / span >
< span class = "comment" > // u64 mid section.< / span >
< span class = "kw" > fn< / span > < span class = "ident" > align_buf< / span > (< span class = "ident" > buf< / span > : < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u8< / span > ]) < span class = "op" > -> < / span > (< span class = "ident" > ShortSlice< / span > , < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u64< / span > ], < span class = "ident" > ShortSlice< / span > ) {
< span class = "kw" > let< / span > < span class = "ident" > start_ptr< / span > < span class = "op" > =< / span > < span class = "ident" > buf< / span > .< span class = "ident" > as_ptr< / span > () < span class = "kw" > as< / span > < span class = "ident" > usize< / span > ;
< span class = "kw" > let< / span > < span class = "ident" > end_ptr< / span > < span class = "op" > =< / span > < span class = "ident" > start_ptr< / span > < span class = "op" > +< / span > < span class = "ident" > buf< / span > .< span class = "ident" > len< / span > ();
< span class = "comment" > // Round *up* to next aligned boundary for start< / span >
< span class = "kw" > let< / span > < span class = "ident" > start_aligned< / span > < span class = "op" > =< / span > (< span class = "ident" > start_ptr< / span > < span class = "op" > +< / span > < span class = "number" > 7< / span > ) < span class = "op" > & < / span > < span class = "op" > !< / span > < span class = "number" > 0x7< / span > ;
< span class = "comment" > // Round *down* to last aligned boundary for end< / span >
< span class = "kw" > let< / span > < span class = "ident" > end_aligned< / span > < span class = "op" > =< / span > < span class = "ident" > end_ptr< / span > < span class = "op" > & < / span > < span class = "op" > !< / span > < span class = "number" > 0x7< / span > ;
< span class = "kw" > if< / span > < span class = "ident" > end_aligned< / span > < span class = "op" > > =< / span > < span class = "ident" > start_aligned< / span > {
< span class = "comment" > // We have our three segments (head, mid, tail)< / span >
< span class = "kw" > let< / span > (< span class = "ident" > tmp< / span > , < span class = "ident" > tail< / span > ) < span class = "op" > =< / span > < span class = "ident" > buf< / span > .< span class = "ident" > split_at_mut< / span > (< span class = "ident" > end_aligned< / span > < span class = "op" > -< / span > < span class = "ident" > start_ptr< / span > );
< span class = "kw" > let< / span > (< span class = "ident" > head< / span > , < span class = "ident" > mid< / span > ) < span class = "op" > =< / span > < span class = "ident" > tmp< / span > .< span class = "ident" > split_at_mut< / span > (< span class = "ident" > start_aligned< / span > < span class = "op" > -< / span > < span class = "ident" > start_ptr< / span > );
< span class = "comment" > // Unsafe: we know the middle section is correctly aligned, and the outer< / span >
< span class = "comment" > // sections are smaller than 8 bytes< / span >
< span class = "kw" > unsafe< / span > { (< span class = "ident" > ShortSlice< / span > ::< span class = "ident" > new< / span > (< span class = "ident" > head< / span > ), < span class = "ident" > cast_slice< / span > (< span class = "ident" > mid< / span > ), < span class = "ident" > ShortSlice< / span > (< span class = "ident" > tail< / span > )) }
} < span class = "kw" > else< / span > {
< span class = "comment" > // We didn' t cross even one aligned boundary!< / span >
< span class = "comment" > // Unsafe: The outer sections are smaller than 8 bytes< / span >
< span class = "kw" > unsafe< / span > { (< span class = "ident" > ShortSlice< / span > ::< span class = "ident" > new< / span > (< span class = "ident" > buf< / span > ), < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [], < span class = "ident" > ShortSlice< / span > ::< span class = "ident" > new< / span > (< span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [])) }
}
}
< span class = "attribute" > #[< span class = "ident" > cfg< / span > (< span class = "ident" > test< / span > )]< / span >
< span class = "kw" > mod< / span > < span class = "ident" > tests< / span > {
< span class = "kw" > use< / span > < span class = "kw" > super< / span > ::< span class = "ident" > apply_mask< / span > ;
< span class = "kw" > use< / span > < span class = "ident" > byteorder< / span > ::{< span class = "ident" > ByteOrder< / span > , < span class = "ident" > LittleEndian< / span > };
< span class = "doccomment" > /// A safe unoptimized mask application.< / span >
< span class = "kw" > fn< / span > < span class = "ident" > apply_mask_fallback< / span > (< span class = "ident" > buf< / span > : < span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > [< span class = "ident" > u8< / span > ], < span class = "ident" > mask< / span > : < span class = "kw-2" > & < / span > [< span class = "ident" > u8< / span > ; < span class = "number" > 4< / span > ]) {
< span class = "kw" > for< / span > (< span class = "ident" > i< / span > , < span class = "ident" > byte< / span > ) < span class = "kw" > in< / span > < span class = "ident" > buf< / span > .< span class = "ident" > iter_mut< / span > ().< span class = "ident" > enumerate< / span > () {
< span class = "kw-2" > *< / span > < span class = "ident" > byte< / span > < span class = "op" > ^=< / span > < span class = "ident" > mask< / span > [< span class = "ident" > i< / span > < span class = "op" > & < / span > < span class = "number" > 3< / span > ];
}
}
< span class = "attribute" > #[< span class = "ident" > test< / span > ]< / span >
< span class = "kw" > fn< / span > < span class = "ident" > test_apply_mask< / span > () {
< span class = "kw" > let< / span > < span class = "ident" > mask< / span > < span class = "op" > =< / span > [< span class = "number" > 0x6d< / span > , < span class = "number" > 0xb6< / span > , < span class = "number" > 0xb2< / span > , < span class = "number" > 0x80< / span > ];
< span class = "kw" > let< / span > < span class = "ident" > mask_u32< / span > : < span class = "ident" > u32< / span > < span class = "op" > =< / span > < span class = "ident" > LittleEndian< / span > ::< span class = "ident" > read_u32< / span > (< span class = "kw-2" > & < / span > < span class = "ident" > mask< / span > );
< span class = "kw" > let< / span > < span class = "ident" > unmasked< / span > < span class = "op" > =< / span > < span class = "macro" > vec< / span > < span class = "macro" > !< / span > [
< span class = "number" > 0xf3< / span > , < span class = "number" > 0x00< / span > , < span class = "number" > 0x01< / span > , < span class = "number" > 0x02< / span > , < span class = "number" > 0x03< / span > , < span class = "number" > 0x80< / span > , < span class = "number" > 0x81< / span > , < span class = "number" > 0x82< / span > , < span class = "number" > 0xff< / span > , < span class = "number" > 0xfe< / span > , < span class = "number" > 0x00< / span > , < span class = "number" > 0x17< / span > ,
< span class = "number" > 0x74< / span > , < span class = "number" > 0xf9< / span > , < span class = "number" > 0x12< / span > , < span class = "number" > 0x03< / span > ,
];
< span class = "comment" > // Check masking with proper alignment.< / span >
{
< span class = "kw" > let< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked< / span > < span class = "op" > =< / span > < span class = "ident" > unmasked< / span > .< span class = "ident" > clone< / span > ();
< span class = "ident" > apply_mask_fallback< / span > (< span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked< / span > , < span class = "kw-2" > & < / span > < span class = "ident" > mask< / span > );
< span class = "kw" > let< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked_fast< / span > < span class = "op" > =< / span > < span class = "ident" > unmasked< / span > .< span class = "ident" > clone< / span > ();
< span class = "ident" > apply_mask< / span > (< span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked_fast< / span > , < span class = "ident" > mask_u32< / span > );
< span class = "macro" > assert_eq< / span > < span class = "macro" > !< / span > (< span class = "ident" > masked< / span > , < span class = "ident" > masked_fast< / span > );
}
< span class = "comment" > // Check masking without alignment.< / span >
{
< span class = "kw" > let< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked< / span > < span class = "op" > =< / span > < span class = "ident" > unmasked< / span > .< span class = "ident" > clone< / span > ();
< span class = "ident" > apply_mask_fallback< / span > (< span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked< / span > [< span class = "number" > 1< / span > ..], < span class = "kw-2" > & < / span > < span class = "ident" > mask< / span > );
< span class = "kw" > let< / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked_fast< / span > < span class = "op" > =< / span > < span class = "ident" > unmasked< / span > .< span class = "ident" > clone< / span > ();
< span class = "ident" > apply_mask< / span > (< span class = "kw-2" > & < / span > < span class = "kw-2" > mut< / span > < span class = "ident" > masked_fast< / span > [< span class = "number" > 1< / span > ..], < span class = "ident" > mask_u32< / span > );
< span class = "macro" > assert_eq< / span > < span class = "macro" > !< / span > (< span class = "ident" > masked< / span > , < span class = "ident" > masked_fast< / span > );
}
}
}
< / pre >
< / section > < section id = "search" class = "content hidden" > < / section > < section class = "footer" > < / section > < aside id = "help" class = "hidden" > < div > < h1 class = "hidden" > Help< / h1 > < div class = "shortcuts" > < h2 > Keyboard Shortcuts< / h2 > < dl > < dt > < kbd > ?< / kbd > < / dt > < dd > Show this help dialog< / dd > < dt > < kbd > S< / kbd > < / dt > < dd > Focus the search field< / dd > < dt > < kbd > ↑< / kbd > < / dt > < dd > Move up in search results< / dd > < dt > < kbd > ↓< / kbd > < / dt > < dd > Move down in search results< / dd > < dt > < kbd > ↹< / kbd > < / dt > < dd > Switch tab< / dd > < dt > < kbd > ⏎ < / kbd > < / dt > < dd > Go to active search result< / dd > < dt > < kbd > +< / kbd > < / dt > < dd > Expand all sections< / dd > < dt > < kbd > -< / kbd > < / dt > < dd > Collapse all sections< / dd > < / dl > < / div > < div class = "infos" > < h2 > Search Tricks< / h2 > < p > Prefix searches with a type followed by a colon (e.g. < code > fn:< / code > ) to restrict the search to a given type.< / p > < p > Accepted types are: < code > fn< / code > , < code > mod< / code > , < code > struct< / code > , < code > enum< / code > , < code > trait< / code > , < code > type< / code > , < code > macro< / code > , and < code > const< / code > .< / p > < p > Search functions by type signature (e.g. < code > vec -> usize< / code > or < code > * -> vec< / code > )< / p > < p > Search multiple things at once by splitting your query with comma (e.g. < code > str,u8< / code > or < code > String,struct:Vec,test< / code > )< / p > < / div > < / div > < / aside > < script > window . rootPath = "../../../" ; window . currentCrate = "actix_web" ; < / script > < script src = "../../../aliases.js" > < / script > < script src = "../../../main.js" > < / script > < script defer src = "../../../search-index.js" > < / script > < / body > < / html >
