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ZATCA Decode QR Code

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Decodes a base64 ZATCA QR code.

Note: This example requires Chilkat v9.5.0.92 or greater.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Note: This example requires Chilkat v9.5.0.92 or greater.

    var qr: [:0]const u8 = "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";

    qr = "AQxGaXJveiBBc2hyYWYCCjEyMzQ1Njc4OTEDEzIwMjEtMTEtMTcgMDg6MzA6MDAEBjEwMC4wMAUFMTUuMDAGLDlmc3JYVW8rU3BYQVlJTkw5aGFLU2dEOXgxaVJsZk53SVBDZnBlWXczYTA9B1hYMEM4VjFIL3hUMGdOaytWWXh2U2Z6UFJlUjZPM2t5VXA0TERITzJLMzlNSGJETXVvTGltQSt3RnovV2pVdEdMSHpaK0J5enNmWUdEQzliNUFGSU1FQT09CFgwVjAQBgcqhkjOPQIBBgUrgQQACgNCAARw3B+mu14x0h3pJFKqEWWT7DmD7jWYkZV7qHyikPlN4P/4/b7YD+A9wnFI92HTKm+/BGKXVf/pfLtsmdIIaPHnCUgwRgIhAMTjOkWwcNu5Aw5k1Yr3YgbPhdxKoJV1a3+5ShPtx1/IAiEAyrwsA/NuqV6XjybyrZpMp6eJAqslACLfCldti/PVOQs=";

    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    try bd.appendEncoded(qr, "base64");

    var index: i32 = 0;
    var expected_tag: i32 = 1;
    var tag: i32 = 0;
    var len: i32 = 0;
    var tag_value: [:0]const u8 = "";

    while (expected_tag <= 9) {
        // Get the tag
        tag = bd.getByte(index);
        if (tag != expected_tag) {
            std.debug.print("Expected tag {d}\n", .{expected_tag});
            return;
        }

        index = index + 1;
        len = bd.getByte(index);
        if (len == 0) {
            std.debug.print("Expected length > 0\n", .{});
            return;
        }

        index = index + 1;
        // Tags 8 and 9 contain binary data.
        if (expected_tag >= 8) {
            tag_value = try bd.getEncodedChunk(alloc, index, len, "base64");
        } else {
            tag_value = try bd.getTextChunk(alloc, index, len, "utf-8");
        }

        std.debug.print("tag {d}: {s}\n", .{ tag, tag_value });

        index = index + len;
        expected_tag = expected_tag + 1;
    }
}