51 lines
1.6 KiB
Zig
51 lines
1.6 KiB
Zig
const std = @import("std");
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fn readHex(allocator: std.mem.Allocator, max_size: usize) ![]u8 {
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const stdin = std.io.bufferedReader(std.io.getStdIn().reader()).reader();
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var inputbuffer = std.ArrayList(u8).init(allocator);
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defer inputbuffer.deinit();
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var resultbuffer = std.ArrayList(u8).init(allocator);
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defer resultbuffer.deinit();
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while (true) {
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try stdin.readUntilDelimiterArrayList(&inputbuffer, '\n', max_size * 2);
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try resultbuffer.resize(inputbuffer.items.len / 2);
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_ = std.fmt.hexToBytes(resultbuffer.items, inputbuffer.items) catch {
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std.log.err("not a valid hexadecimal", .{});
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continue;
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};
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return resultbuffer.toOwnedSlice();
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}
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}
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pub fn main() anyerror!void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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const allocator = gpa.allocator();
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const stdout = std.io.getStdOut().writer();
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while (true) {
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const input1 = try readHex(allocator, 4096);
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defer allocator.free(input1);
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const input2 = try readHex(allocator, 4096);
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defer allocator.free(input2);
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if (input1.len != input2.len) {
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std.log.err("not the same length", .{});
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continue;
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}
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var output = try std.ArrayList(u8).initCapacity(allocator, input1.len);
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defer output.deinit();
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var i: usize = 0;
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while (i < input1.len) : (i += 1) {
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try output.append(input1[i] ^ input2[i]);
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}
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try stdout.print("{}\n", .{std.fmt.fmtSliceHexLower(output.items)});
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}
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}
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