Zig

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Zig

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

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

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const charset = try chilkat.Charset.init();
    defer charset.deinit();

    charset.setFromCharset("utf-8");
    charset.setToCharset("bom-utf-8");

    charset.convertFile("qa_data/txt/helloWorld.txt", "qa_output/helloWorldBom.txt") catch {
        std.debug.print("{s}\n", .{try charset.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Success.\n", .{});
}