patch of add zigzag coding · round #0 · pull #3 · altagos.dev/codings

+37

src/ZigZag.zig

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       pub fn encode(value: isize) usize {

     

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           if (value < 0) return @as(usize, @intCast(value * -1)) * 2 - 1;

     

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           return @as(usize, @intCast(value)) * 2;

     

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       }

     

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       pub fn decode(value: usize) isize {

     

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           if (value & 1 == 1) return -@as(isize, @intCast(value / 2)) - 1;

     

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           return @as(isize, @intCast(value / 2));

     

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       }

     

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       test "zigzag.encode val = 10" {

     

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           const testing = @import("std").testing;

     

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           const encoded = encode(10);

     

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           try testing.expectEqual(20, encoded);

     

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       }

     

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       test "zigzag.encode val = -42" {

     

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           const testing = @import("std").testing;

     

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           const encoded = encode(-42);

     

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           try testing.expectEqual(83, encoded);

     

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       }

     

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       test "zigzag.decode val = 20" {

     

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           const testing = @import("std").testing;

     

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           const decoded = decode(20);

     

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           try testing.expectEqual(10, decoded);

     

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       }

     

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       test "zigzag.decode val = 83" {

     

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           const testing = @import("std").testing;

     

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           const decoded = decode(83);

     

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           try testing.expectEqual(-42, decoded);

     

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       }

src/root.zig

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       const std = @import("std");

     

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       pub const Golomb = @import("Golomb.zig");

     

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       pub const ZigZag = @import("ZigZag.zig");

     

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       test {

     

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           std.testing.refAllDecls(@This());