Question

我需要将压缩文本写入QR码，然后对其进行扫描和解压缩。

源文本是缩小的JSON字符串： {"ref":"WR0001","customsType":"GIFT","insuredValue":20000,"weight":500,"shippingMethod":"EMS","sender":{"notificationEmail":"asd@asd.com","phoneNumber":"+818023459877","address":{"name":"TestName","companyName":"TestCompanyName","address1":"Testaddress1","address2":"Testaddress2","city":"Testcity","postalCode":"111222","region":"Tokyo","countryIso2":"ES"}},"recipient":{"phoneNumber":"+81231231","address":{"name":"John","companyName":"Salchichon","address1":"myhome","address2":"somewhere","city":"somecity","region":"someregion","postalCode":"111","codiceFiscale":"232323","countryIso2":"IT"}},"items":[{"quantity":1,"price":1000,"customs":"Somecustoms1"},{"quantity":2,"price":1500,"customs":"Somecustoms2"}]}

Deflate似乎会生成这样的二进制文本

óMMÉ，I，ÉÌÏSÈÈ/QHÎÈLÎNÍS（K，È/ * O，JŠ％gèf§Vò[...截短]

有没有一种压缩算法可以渲染base64文本？我需要一些可以存储在QR码中的东西。

如果仅将base64编码应用于压缩字节，则会得到一个比源文本大的字符串！

public partial class Main : Form
{
    public Main()
    {
        InitializeComponent();
        this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Main_KeyPress);
    }
    List<char> _barcode = new List<char>(1000);
private void Main_KeyPress(object sender, KeyPressEventArgs e)
    {

        _barcode.Add(e.KeyChar);

        // process barcode
        if (e.KeyChar == 13 && _barcode.Count > 0)
        {
            string msg = new String(_barcode.ToArray());
            MessageBox.Show(msg );
            Console.WriteLine(msg);

            //serializer
            MemoryStream stream = new MemoryStream(Encoding.Default.GetBytes(msg));

            byte[] compressedBytes;
            compressedBytes = Compress(stream);
            Console.WriteLine("compressed:" + Encoding.Default.GetString(compressedBytes));

            Decompress(compressedBytes);

            _barcode.Clear();


        }
    }

    private static Stream Decompress(byte[] input)
    {
        var output = new MemoryStream();

        using (var compressStream = new MemoryStream(input))
        using (var decompressor = new DeflateStream(compressStream, CompressionMode.Decompress))
            decompressor.CopyTo(output);

        output.Position = 0;
        Console.WriteLine("decompressed:" + Encoding.Default.GetString(output.ToArray()));
        output.Position = 0;
        return output;
    }


    private static byte[] Compress(Stream input)
    {
        using (var compressStream = new MemoryStream())
        using (var compressor = new DeflateStream(compressStream, CompressionMode.Compress))
        {
            input.CopyTo(compressor);
            compressor.Close();
            return compressStream.ToArray();
        }
    }
}

}

Answer 1

如果您的数据按注释中所述4：1压缩，那么使用Base64进行编码只会将其扩展33％，剩下3：1压缩。

您可以改用Base85编码，选择85个可打印字符。这样会将四个字节转换为五个字符，而不是像Base64那样将三个字节转换为四个字符。

如何压缩成ASCII可读文本？

1 个答案: