我需要压缩一个字节数组。所以我写了这个片段:使用Gzip压缩/解压缩一个字节数组
class Program
{
static void Main()
{
var test = "foo bar baz";
var compressed = Compress(Encoding.UTF8.GetBytes(test));
var decompressed = Decompress(compressed);
Console.WriteLine("size of initial table = " + test.Length);
Console.WriteLine("size of compressed table = " + compressed.Length);
Console.WriteLine("size of decompressed table = " + decompressed.Length);
Console.WriteLine(Encoding.UTF8.GetString(decompressed));
Console.ReadKey();
}
static byte[] Compress(byte[] data)
{
using (var compressedStream = new MemoryStream())
using (var zipStream = new GZipStream(compressedStream, CompressionMode.Compress))
{
zipStream.Write(data, 0, data.Length);
zipStream.Close();
return compressedStream.ToArray();
}
}
static byte[] Decompress(byte[] data)
{
using (var compressedStream = new MemoryStream(data))
using (var zipStream = new GZipStream(compressedStream, CompressionMode.Decompress))
using (var resultStream = new MemoryStream())
{
zipStream.CopyTo(resultStream);
return resultStream.ToArray();
}
}
}
的问题是,我得到这样的输出:
我不明白,为什么在压缩数组的大小比解一个更大的!
任何想法?
编辑
@富豪的评论后:如果我改变例如test
字符串:
var test = "foo bar baz very long string for example hdgfgfhfghfghfghfghfghfghfghfghfghfghfhg";
我得到不同的结果。那么要压缩的初始数组的最小大小是多少?
因为数据是如此之小,压缩格式的开销大于压缩的增益。尝试更多数据。注意:完全随机的数据不会被压缩。 – spender
@spender PLZ看到我的编辑并发布您的想法作为答案,谢谢 –