从C ++的zlib到C＃（如何的byte []转换成流和流为byte []） [英] zlib from C++ to C#(How to convert byte[] to stream and stream to byte[])

问题描述

我的任务是使用zlib的解压缩（接收）数据包，然后使用algoritm从数据使图片

My task is to decompress a packet(received) using zlib and then use an algoritm to make a picture from the data

好消息是，我有代码在C ++中，但任务是做在C＃

The good news is that I have the code in C++,but the task is to do it in C#

C ++

		//Read the first values of the packet received

		DWORD image[200 * 64] = {0}; //used for algoritm(width always = 200 and height always == 64)
		int imgIndex = 0; //used for algoritm
		unsigned char rawbytes_[131072] = {0}; //read below
		unsigned char * rawbytes = rawbytes_; //destrination parameter for decompression(ptr)
		compressed = r.Read<WORD>(); //the length of the compressed bytes(picture)
		uncompressed = r.Read<WORD>(); //the length that should be after decompression
		width = r.Read<WORD>(); //the width of the picture
		height = r.Read<WORD>(); //the height of the picture

		LPBYTE ptr = r.GetCurrentStream(); //the bytes(file that must be decompressed)

		outLen = uncompressed; //copy the len into another variable

		//Decompress

		if(uncompress((Bytef*)rawbytes, &outLen, ptr, compressed) != Z_OK)
		{
			printf("Could not uncompress the image code.\n");
			Disconnect();
			return;
		}

		//Algoritm to make up the picture
		// Loop through the data
		for(int c = 0; c < (int)height; ++c)
		{
			for(int r = 0; r < (int)width; ++r)
			{
				imgIndex = (height - 1 - c) * width + r;
				image[imgIndex] = 0xFF000000;
				if(-((1 << (0xFF & (r & 0x80000007))) & rawbytes[((c * width + r) >> 3)])) 
					image[imgIndex] = 0xFFFFFFFF;
			}
		}

我试图用zlib.NET做到这一点，但所有演示有代码解压缩（C＃）

I'm trying to do this with zlib.NET ,but all demos have that code to decompress(C#)

    private void decompressFile(string inFile, string outFile)
	{
		System.IO.FileStream outFileStream = new System.IO.FileStream(outFile, System.IO.FileMode.Create);
		zlib.ZOutputStream outZStream = new zlib.ZOutputStream(outFileStream);
		System.IO.FileStream inFileStream = new System.IO.FileStream(inFile, System.IO.FileMode.Open);			
		try
		{
			CopyStream(inFileStream, outZStream);
		}
		finally
		{
			outZStream.Close();
			outFileStream.Close();
			inFileStream.Close();
		}
	}

	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();
	}

我的问题：我不希望保存解压后的文件，因为我必须使用在C ++代码所示algoritm。

My problem:I don't want to save the file after decompression,because I have to use the algoritm shown in the C++ code.

如何将byte []数组转换成流类同一个在C＃zlib的代码来解压数据，然后如何将流转换回字节数组？

How to convert the byte[] array into a stream similiar to the one in the C# zlib code to decompress the data and then how to convert the stream back into byte array?

另外，如何改变zlib.NET代码无法保存文件？

Also,How to change the zlib.NET code to NOT save files?

推荐答案

只需使用MemoryStreams，而不是文件流：

Just use MemoryStreams instead of FileStreams:

// Assuming inputData is a byte[]
MemoryStream input = new MemoryStream(inputData);
MemoryStream output = new MemoryStream();

然后你可以使用 output.ToArray（）事后得到一个字节数组了。

Then you can use output.ToArray() afterwards to get a byte array out.

请注意，这是通常最好使用 语句，而不是一个单一的try / finally块 - 否则，如果到第一次调用关闭失败，其余的将不能进行。您可以嵌套他们是这样的：使用

Note that it's generally better to use using statements instead of a single try/finally block - as otherwise if the first call to Close fails, the rest won't be made. You can nest them like this:

using (MemoryStream output = new MemoryStream())
using (Stream outZStream = new zlib.ZOutputStream(output))
using (Stream input = new MemoryStream(bytes))
{
    CopyStream(inFileStream, outZStream);
    return output.ToArray();
}

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