我知道有system.io.compression.gzipstream,但它接受一个流作为参数。
我正在寻找一个可以接受字符串的方法。
例如:
string compress(string stringtocompress,compressionlevel level);
string decompress(string stringtodecompress);
我知道有system.io.compression.gzipstream,但它接受一个流作为参数。
我正在寻找一个可以接受字符串的方法。
例如:
string compress(string stringtocompress,compressionlevel level);
string decompress(string stringtodecompress);
你应该试试这个:
using System;
using System.IO;
using System.IO.Compression;
using System.Text;
...
public static string Compress(string s)
{
var bytes = Encoding.Unicode.GetBytes(s);
using (var msi = new MemoryStream(bytes))
using (var mso = new MemoryStream())
{
using (var gs = new GZipStream(mso, CompressionMode.Compress))
{
msi.CopyTo(gs);
}
return Convert.ToBase64String(mso.ToArray());
}
}
public static string Decompress(string s)
{
var bytes = Convert.FromBase64String(s);
using (var msi = new MemoryStream(bytes))
using (var mso = new MemoryStream())
{
using (var gs = new GZipStream(msi, CompressionMode.Decompress))
{
gs.CopyTo(mso);
}
return Encoding.Unicode.GetString(mso.ToArray());
}
}
public static byte[] Compress(string text)
{
var bytes = Encoding.Unicode.GetBytes(text);
using (var mso = new MemoryStream())
{
using (var gs = new GZipStream(mso, CompressionMode.Compress))
{
gs.Write(bytes, 0, bytes.Length);
}
return mso.ToArray();
}
}
public static string Decompress(byte[] data)
{
// Read the last 4 bytes to get the length
byte[] lengthBuffer = new byte[4];
Array.Copy(data, data.Length - 4, lengthBuffer, 0, 4);
int uncompressedSize = BitConverter.ToInt32(lengthBuffer, 0);
var buffer = new byte[uncompressedSize];
using (var ms = new MemoryStream(data))
{
using (var gzip = new GZipStream(ms, CompressionMode.Decompress))
{
gzip.Read(buffer, 0, uncompressedSize);
}
}
return Encoding.Unicode.GetString(buffer);
}
gzip.Read(buffer, 0, uncompressedSize)
可能并不会读取整个流。您可能需要在循环中进行重复调用,并查看返回值以跟踪实际读入缓冲区的字节数。请参阅 https://github.com/dotnet/runtime/issues/62954 获取更多信息。 - Stephen SwensenBitConverter.ToInt32(data, data.Length - 4)
可以更简洁地计算出 uncompressedSize
。 - Stephen Swensen