/// <summary>
/// 写压缩文件 串行化
/// </summary>
/// <param name="piaFile">被反序列化解压的压缩文件信息</param>
/// <param name="stream">流文件</param>
/// <param name="IsPlotOrTxt">true保存为打印,false保存为txt</param>
public static void Serialize(this PiaFile piaFile, Stream stream, bool IsPlotOrTxt = true)
{
if (piaFile == null)
{
throw new ArgumentNullException("PiaFile");
}
if (stream == null)
{
throw new ArgumentNullException("Stream");
}
if (IsPlotOrTxt)
{
//头信息
var headerString = piaFile.Header.ToString();
var headerBytes = Encoding.Default.GetBytes(headerString);
stream.Write(headerBytes, 0, headerBytes.Length);//写入
}
//节点
var nodeString = piaFile.SerializeNode();
var nodeBytes = Encoding.Default.GetBytes(nodeString);
if (IsPlotOrTxt)
{
//压缩节点
byte[] deflatedBytes;
var deflater = new Deflater(Deflater.DEFAULT_COMPRESSION); //默认压缩系数
using (var ms = new MemoryStream()) //内存流
{
var deflateStream = new DeflaterOutputStream(ms, deflater); //压缩流生成
deflateStream.Write(nodeBytes, 0, nodeBytes.Length);
deflateStream.Finish();
deflatedBytes = ms.ToArray();
}
//校验和
var checkSum = new byte[12];
BitConverter.GetBytes(deflater.Adler).CopyTo(checkSum, 0); // Adler
BitConverter.GetBytes(nodeBytes.Length).CopyTo(checkSum, 4); // 压缩前字节数
BitConverter.GetBytes(deflatedBytes.Length).CopyTo(checkSum, 8); // 压缩后字节数
stream.Write(checkSum, 0, checkSum.Length); //写入
// 最终写入
stream.Write(deflatedBytes, 0, deflatedBytes.Length);
}
else
{
stream.Write(nodeBytes, 0, nodeBytes.Length);//写出txt测试
}
stream.Write(Encoding.Default.GetBytes("\0"), 0, 1);
}
/// <summary>
/// 反序列化解压
/// </summary>
/// <param name="stream"></param>
/// <param name="piaFile"></param>
public static void Deserialize(this PiaFile piaFile, Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("Stream");
}
if (piaFile == null)
{
throw new ArgumentNullException("PiaFile");
}
try
{
//头信息
var headerBytes = new byte[48]; // Ignore 12 byte checksum 有12个是校验信息,所以不解压
stream.Read(headerBytes, 0, headerBytes.Length); //二进制读取这些信息
var headerString = Encoding.Default.GetString(headerBytes);
piaFile.Header = new PiaHeader(headerString); //头信息写到这里干什么??
//解压
stream.Seek(60, SeekOrigin.Begin); //从60字节位置开始解压
string inflatedString;
using (var zStream = new InflaterInputStream(stream)) //压缩流
{
var sr = new StreamReader(zStream, Encoding.Default); //自动编码读取压缩流
inflatedString = sr.ReadToEnd(); //读到最后
}
//拥有者
piaFile.Owner = piaFile;
PiaFile = piaFile;
DeserializeNode(piaFile, inflatedString);
}
catch (Exception)
{
throw;
}
}
