feat(funcs): add bitsize/1 and subbits/2,3,6 functions
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Shawn
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8a50c70ca3
commit
c3159420bb
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@ -78,6 +78,10 @@
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, bitxor/2
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, bitsl/2
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, bitsr/2
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, bitsize/1
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, subbits/2
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, subbits/3
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, subbits/6
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]).
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%% Data Type Convertion
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@ -401,6 +405,74 @@ bitsl(X, I) when is_integer(X), is_integer(I) ->
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bitsr(X, I) when is_integer(X), is_integer(I) ->
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X bsr I.
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bitsize(Bits) when is_bitstring(Bits) ->
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bit_size(Bits).
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subbits(Bits, Len) when is_integer(Len), is_bitstring(Bits) ->
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subbits(Bits, 1, Len).
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subbits(Bits, Start, Len) when is_integer(Start), is_integer(Len), is_bitstring(Bits) ->
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get_subbits(Bits, Start, Len, <<"integer">>, <<"unsigned">>, <<"big">>).
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subbits(Bits, Start, Len, Type, Signedness, Endianness) when is_integer(Start), is_integer(Len), is_bitstring(Bits) ->
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get_subbits(Bits, Start, Len, Type, Signedness, Endianness).
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get_subbits(Bits, Start, Len, Type, Signedness, Endianness) ->
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Begin = Start - 1,
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case Bits of
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<<_:Begin, Rem/bits>> when Rem =/= <<>> ->
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Sz = bit_size(Rem),
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do_get_subbits(Rem, Sz, Len, Type, Signedness, Endianness);
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_ -> undefined
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end.
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-define(match_bits(Bits0, Pattern, ElesePattern),
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case Bits0 of
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Pattern ->
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SubBits;
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ElesePattern ->
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SubBits
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end).
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do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"unsigned">>, <<"big">>) ->
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?match_bits(Bits, <<SubBits:Len/integer-unsigned-big-unit:1, _/bits>>,
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<<SubBits:Sz/integer-unsigned-big-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"float">>, <<"unsigned">>, <<"big">>) ->
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?match_bits(Bits, <<SubBits:Len/float-unsigned-big-unit:1, _/bits>>,
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<<SubBits:Sz/float-unsigned-big-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"unsigned">>, <<"big">>) ->
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?match_bits(Bits, <<SubBits:Len/bits-unsigned-big-unit:1, _/bits>>,
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<<SubBits:Sz/bits-unsigned-big-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"signed">>, <<"big">>) ->
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?match_bits(Bits, <<SubBits:Len/integer-signed-big-unit:1, _/bits>>,
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<<SubBits:Sz/integer-signed-big-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"float">>, <<"signed">>, <<"big">>) ->
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?match_bits(Bits, <<SubBits:Len/float-signed-big-unit:1, _/bits>>,
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<<SubBits:Sz/float-signed-big-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"signed">>, <<"big">>) ->
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?match_bits(Bits, <<SubBits:Len/bits-signed-big-unit:1, _/bits>>,
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<<SubBits:Sz/bits-signed-big-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"unsigned">>, <<"little">>) ->
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?match_bits(Bits, <<SubBits:Len/integer-unsigned-little-unit:1, _/bits>>,
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<<SubBits:Sz/integer-unsigned-little-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"float">>, <<"unsigned">>, <<"little">>) ->
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?match_bits(Bits, <<SubBits:Len/float-unsigned-little-unit:1, _/bits>>,
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<<SubBits:Sz/float-unsigned-little-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"unsigned">>, <<"little">>) ->
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?match_bits(Bits, <<SubBits:Len/bits-unsigned-little-unit:1, _/bits>>,
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<<SubBits:Sz/bits-unsigned-little-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"signed">>, <<"little">>) ->
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?match_bits(Bits, <<SubBits:Len/integer-signed-little-unit:1, _/bits>>,
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<<SubBits:Sz/integer-signed-little-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"float">>, <<"signed">>, <<"little">>) ->
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?match_bits(Bits, <<SubBits:Len/float-signed-little-unit:1, _/bits>>,
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<<SubBits:Sz/float-signed-little-unit:1>>);
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do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"signed">>, <<"little">>) ->
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?match_bits(Bits, <<SubBits:Len/bits-signed-little-unit:1, _/bits>>,
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<<SubBits:Sz/bits-signed-little-unit:1>>).
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%%------------------------------------------------------------------------------
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%% Data Type Convertion Funcs
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%%------------------------------------------------------------------------------
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@ -505,6 +505,54 @@ t_map_put(_) ->
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?assertEqual(#{<<"a">> => 2}, apply_func(map_put, [<<"a">>, 2, #{<<"a">> => 1}])),
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?assertEqual(#{a => 2}, apply_func(map_put, [<<"a">>, 2, #{a => 1}])).
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t_bitsize(_) ->
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?assertEqual(8, apply_func(bitsize, [<<"a">>])),
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?assertEqual(4, apply_func(bitsize, [<<15:4>>])).
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t_subbits(_) ->
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?assertEqual(1, apply_func(subbits, [<<255:8>>, 1])),
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?assertEqual(3, apply_func(subbits, [<<255:8>>, 2])),
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?assertEqual(7, apply_func(subbits, [<<255:8>>, 3])),
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?assertEqual(15, apply_func(subbits, [<<255:8>>, 4])),
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?assertEqual(31, apply_func(subbits, [<<255:8>>, 5])),
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?assertEqual(63, apply_func(subbits, [<<255:8>>, 6])),
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?assertEqual(127, apply_func(subbits, [<<255:8>>, 7])),
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?assertEqual(255, apply_func(subbits, [<<255:8>>, 8])).
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t_subbits2(_) ->
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?assertEqual(1, apply_func(subbits, [<<255:8>>, 1, 1])),
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?assertEqual(3, apply_func(subbits, [<<255:8>>, 1, 2])),
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?assertEqual(7, apply_func(subbits, [<<255:8>>, 1, 3])),
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?assertEqual(15, apply_func(subbits, [<<255:8>>, 1, 4])),
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?assertEqual(31, apply_func(subbits, [<<255:8>>, 1, 5])),
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?assertEqual(63, apply_func(subbits, [<<255:8>>, 1, 6])),
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?assertEqual(127, apply_func(subbits, [<<255:8>>, 1, 7])),
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?assertEqual(255, apply_func(subbits, [<<255:8>>, 1, 8])).
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t_subbits2_1(_) ->
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?assertEqual(1, apply_func(subbits, [<<255:8>>, 2, 1])),
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?assertEqual(3, apply_func(subbits, [<<255:8>>, 2, 2])),
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?assertEqual(7, apply_func(subbits, [<<255:8>>, 2, 3])),
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?assertEqual(15, apply_func(subbits, [<<255:8>>, 2, 4])),
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?assertEqual(31, apply_func(subbits, [<<255:8>>, 2, 5])),
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?assertEqual(63, apply_func(subbits, [<<255:8>>, 2, 6])),
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?assertEqual(127, apply_func(subbits, [<<255:8>>, 2, 7])),
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?assertEqual(127, apply_func(subbits, [<<255:8>>, 2, 8])).
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t_subbits2_integer(_) ->
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?assertEqual(456, apply_func(subbits, [<<456:32/integer>>, 1, 32, <<"integer">>, <<"signed">>, <<"big">>])),
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?assertEqual(-456, apply_func(subbits, [<<-456:32/integer>>, 1, 32, <<"integer">>, <<"signed">>, <<"big">>])).
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t_subbits2_float(_) ->
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R = apply_func(subbits, [<<5.3:64/float>>, 1, 64, <<"float">>, <<"unsigned">>, <<"big">>]),
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RL = (5.3 - R),
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ct:pal(";;;;~p", [R]),
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?assert( (RL >= 0 andalso RL < 0.0001) orelse (RL =< 0 andalso RL > -0.0001)),
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R2 = apply_func(subbits, [<<-5.3:64/float>>, 1, 64, <<"float">>, <<"signed">>, <<"big">>]),
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RL2 = (5.3 + R2),
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ct:pal(";;;;~p", [R2]),
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?assert( (RL2 >= 0 andalso RL2 < 0.0001) orelse (RL2 =< 0 andalso RL2 > -0.0001)).
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%%------------------------------------------------------------------------------
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%% Test cases for Hash funcs
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