Zig

Insert PDF as Base64 into XML, then Extract back to PDF File

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Demonstrates how to insert any file into XML using base64 encoding, and then extract back to the original file. This example embeds a PDF in the XML, but the type of file does not matter. It can be any type of file. Zig

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

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

    // Load our PDF file.
    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    bd.loadFile("qa_data/helloWorld.pdf") catch {
        std.debug.print("Failed to load PDF file.\n", .{});
        return;
    };

    // Load the following XML:
    //
    // <?xml version="1.0" encoding="utf-8" ?>
    // <something>
    //     <xyz>
    //         <abc123>A base64 encoded PDF file will be inserted under this node.</abc123>
    //     </xyz>
    // </something>

    const xml = try chilkat.Xml.init();
    defer xml.deinit();
    xml.loadXmlFile("qa_data/xml/xmlToContainPdf.xml") catch {
        std.debug.print("Failed to load XML file.\n", .{});
        return;
    };

    // Insert the PDF into the XML.
    xml.newChild2("xyz|pdfData", try bd.getEncoded(alloc, "base64"));

    // Show the new XML:
    std.debug.print("{s}\n", .{try xml.getXml(alloc)});

    // The XML now looks like this:
    // <?xml version="1.0" encoding="utf-8" ?>
    // <something>
    //     <xyz>
    //         <abc123>A base64 encoded PDF file will be inserted under this node.</abc123>
    //         <pdfData>JVBERi0xL ... UlRU9GCg==</pdfData>
    //     </xyz>
    // </something>

    // To extract the PDF data out and restore the PDF file:
    const bd2 = try chilkat.BinData.init();
    defer bd2.deinit();
    try bd2.appendEncoded(try xml.getChildContent(alloc, "xyz|pdfData"), "base64");
    try bd2.writeFile("qa_output/helloWorld.pdf");

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