The library contains the static DataUrl class that supports the "data" URL scheme (RFC 2397), which allows to embed data in a URI. The DataUrl class allows
- building "data" URL strings from files, byte arrays or text,
- parsing "data" URL strings as
DataUrlInfostructs in order to examine their content without having to allocate a lot of sub-strings, and to enable the comparison of "data" URLs for equality, - retrieving the embedded data from "data" URL strings,
- retrieving an appropriate file type extension for the embedded data.
The library is designed to support performance and small heap allocation.
Creating and parsing a "data" URL:
using FolkerKinzel.DataUrls;
using FolkerKinzel.DataUrls.Extensions;
using System.Diagnostics;
namespace Examples;
public static class DataUrlExample
{
public static void Example()
{
// Creates a temporary JPG file for testing.
string photoFilePath = CreatePhotoFile();
// Creates a "data" URL string from the file.
// The MIME type comes from the file type extension
// (if not provided as argument):
string dataUrl = DataUrl.FromFile(photoFilePath);
// (The photo file is no longer needed.)
File.Delete(photoFilePath);
// Uncomment this to show the content of the
// "data" URL in the Microsoft Edge browser.
// (Make shure you have this browser installed.):
// ShowPictureInMicrosoftEdge(dataUrl);
Console.WriteLine(dataUrl);
Console.WriteLine();
Console.WriteLine("Is \"data\" URL: {0}", dataUrl.IsDataUrl());
Console.WriteLine();
// Parse the content of the "data" URL:
_ = DataUrl.TryParse(dataUrl, out DataUrlInfo info);
Console.WriteLine("Data Type: {0}", info.DataType);
Console.WriteLine("MIME Type: {0}", info.MimeType);
Console.WriteLine("File Type Ext.: {0}", info.GetFileTypeExtension());
Console.WriteLine("Data Encoding: {0}", info.Encoding);
Console.WriteLine();
if (info.TryGetData(out EmbeddedData data))
{
// EmbeddedData is a union that contains either a
// byte array or a string.
Console.WriteLine(data);
}
}
/// <summary>
/// Creates a temporary photo file. The data comes from a given "data" URL.
/// </summary>
/// <returns>The file path.</returns>
private static string CreatePhotoFile()
{
const string url = "data:image/jpeg;base64,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";
string path = "";
// Tries to get the embedded data as Byte array
// (and an appropriate file type extension too):
if (DataUrl.TryGetBytes(url,
out byte[]? bytes,
out string? fileTypeExtension) && bytes.Length > 0)
{
path = Path.Combine(
Directory.GetCurrentDirectory(), $"{Guid.NewGuid()}{fileTypeExtension}");
File.WriteAllBytes(path, bytes);
}
return path;
}
/// <summary>
/// Displays the content of a "data" URL in the Edge browser.
/// </summary>
/// <param name="dataUrl">The "data" URL.</param>
private static void ShowPictureInMicrosoftEdge(string dataUrl)
{
var process = new Process();
process.StartInfo.UseShellExecute = true;
process.StartInfo.FileName = "msedge";
process.StartInfo.Arguments = dataUrl;
_ = process.Start();
}
}
/*
Console Output:
data:image/jpeg;base64,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
Is "data" URL: True
Data Type: Binary
MIME Type: image/jpeg
File Type Ext.: .jpg
Data Encoding: Base64
System.Byte[]: 2472 Bytes
*/