Question

我正在使用ZLIB.Net，我只是不明白我应该怎样做来压缩不是FileStream的流，而是MemoryStream。通过做：

byte[] buffer = ASCIIEncoding.ASCII.GetBytes("Hello World");

MemoryStream outStream = new MemoryStream();
zlib.ZOutputStream outZStream = new zlib.ZOutputStream(
    outStream,
    zlib.zlibConst.Z_BEST_COMPRESSION);

outZStream.Write(buffer, 0, buffer.Length);
outZStream.finish();

buffer = outStream.GetBuffer();
Debug.WriteLine(DateTime.Now.ToString() + ":" + buffer.Length);

MemoryStream inStream = new MemoryStream(buffer);
MemoryStream mo = new MemoryStream();
zlib.ZInputStream inZStream = new zlib.ZInputStream(
    inStream,
    zlib.zlibConst.Z_BEST_COMPRESSION);

int n = 0;
while ((n = inZStream.Read(buffer, 0, buffer.Length)) > 0)
{
    mo.Write(buffer, 0, n);
}

string STR = ASCIIEncoding.ASCII.GetString(mo.GetBuffer());

我无法恢复字符串"Hello World"。

Answer 1

longbkit ，感谢您的参考。那里有代码：

 public static void CompressData(byte[] inData, out byte[] outData)
{
    using (MemoryStream outMemoryStream = new MemoryStream())
    using (ZOutputStream outZStream = new ZOutputStream(outMemoryStream, zlibConst.Z_DEFAULT_COMPRESSION))
    using (Stream inMemoryStream = new MemoryStream(inData))
    {
        CopyStream(inMemoryStream, outZStream);
        outZStream.finish();
        outData = outMemoryStream.ToArray();
    }
}

public static void DecompressData(byte[] inData, out byte[] outData)
{
    using (MemoryStream outMemoryStream = new MemoryStream())
    using (ZOutputStream outZStream = new ZOutputStream(outMemoryStream))
    using (Stream inMemoryStream = new MemoryStream(inData))
    {
        CopyStream(inMemoryStream, outZStream);
        outZStream.finish();
        outData = outMemoryStream.ToArray();
    }
}

public static void CopyStream(System.IO.Stream input, System.IO.Stream output)
{
    byte[] buffer = new byte[2000];
    int len;
    while ((len = input.Read(buffer, 0, 2000)) > 0)
    {
        output.Write(buffer, 0, len);
    }
    output.Flush();
}

有效。但我所看到的是压缩和解压缩之间唯一的差异是ZOutput构造函数中的压缩类型......

惊人。如果Compression在减压 - 输入时称为输出，那么对我来说会更清楚。或者这样......实际上它只是输出。

❋ 用户“John Smith”破坏了原始代码，因为CopyTo不起作用并在其编辑的文本中引发异常（并且被其他人批准两次......）。通过OP恢复原始代码示例。请在下次编辑之前测试编辑过的代码，谢谢。

Answer 2

更改代码。

inZStream.Read

-> inZStream.read

来自ZInputStream.cs中的sourceCode

zlib.Net的压缩和解压缩问题

2 个答案: