-module(packkit@internal@brotli_context).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/packkit/internal/brotli_context.gleam").
-export([context_id/3]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

?MODULEDOC(false).

-file("src/packkit/internal/brotli_context.gleam", 2074).
?DOC(false).
-spec byte_at(integer()) -> integer().
byte_at(Offset) ->
    Slice@1 = case gleam_stdlib:bit_array_slice(
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            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            16,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            24,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            32,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
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            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            40,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            48,
            56,
            0,
            1,
            1,
            1,
            1,
            1,
            1,
            1,
            1,
            1,
            1,
            1,
            1,
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            2,
            2,
            2,
            2,
            2,
            2,
            2,
            2,
            2,
            2,
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            2,
            2,
            2,
            2,
            2,
            2,
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            2,
            3,
            3,
            3,
            3,
            3,
            3,
            3,
            3,
            3,
            3,
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            3,
            3,
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            3,
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            3,
            3,
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            4,
            4,
            4,
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            4,
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            4,
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            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
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            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            5,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            6,
            7>>,
        Offset,
        1
    ) of
        {ok, Slice} -> Slice;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Pattern match failed, no pattern matched the value."/utf8>>,
                        file => <<?FILEPATH/utf8>>,
                        module => <<"packkit/internal/brotli_context"/utf8>>,
                        function => <<"byte_at"/utf8>>,
                        line => 2075,
                        value => _assert_fail,
                        start => 12048,
                        'end' => 12105,
                        pattern_start => 12059,
                        pattern_end => 12068})
    end,
    case Slice@1 of
        <<B>> ->
            B;

        _ ->
            0
    end.

-file("src/packkit/internal/brotli_context.gleam", 2067).
?DOC(false).
-spec context_id(integer(), integer(), integer()) -> integer().
context_id(Mode, Prev1, Prev2) ->
    Base = erlang:'bsl'(erlang:'band'(Mode, 3), 9),
    P1_byte = byte_at(Base + erlang:'band'(Prev1, 16#FF)),
    P2_byte = byte_at((Base + 256) + erlang:'band'(Prev2, 16#FF)),
    erlang:'bor'(P1_byte, P2_byte).