我的任务是使用zlib解压缩数据包(接收到的数据包),然后使用算法从数据中制作图片
好消息是我已经用C++编写了代码,但是任务是用C#编写代码
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;
}
}
我正在尝试使用zlib.NET进行此操作,但是所有演示都具有要解压缩的代码(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:我不想在解压缩后保存文件,因为我必须使用C++代码中显示的算法。
如何将byte []数组转换为与C#zlib代码中的流相似的流以解压缩数据,然后如何将流转换回字节数组?
另外,如何将zlib.NET代码更改为不保存文件?
最佳答案
只需使用MemoryStreams而不是FileStreams:
// Assuming inputData is a byte[]
MemoryStream input = new MemoryStream(inputData);
MemoryStream output = new MemoryStream();
然后,您可以随后使用
output.ToArray()
取出字节数组。请注意,通常最好使用
using
语句而不是单个try/finally块-否则,如果第一次调用Close
失败,则将不会进行其余操作。您可以像这样嵌套它们:using (MemoryStream output = new MemoryStream())
using (Stream outZStream = new zlib.ZOutputStream(output))
using (Stream input = new MemoryStream(bytes))
{
CopyStream(inFileStream, outZStream);
return output.ToArray();
}
关于c# - zlib从C++到C#(如何将byte []转换为流,并将流转换为byte []),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/737258/