我的任务是使用zlib解压缩数据包(已接收),然后使用算法从数据中生成图片
好消息是我在C中有代码,但任务是在C#中完成
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,但所有演示都有该代码进行解压缩(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,2000)) > 0)
{
output.Write(buffer,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 []数组转换为类似于C#zlib代码中的流来解压缩数据然后如何将流转换回字节数组？
解决方法
只需使用MemoryStreams而不是FileStreams：
// Assuming inputData is a byte[] MemoryStream input = new MemoryStream(inputData); MemoryStream output = new MemoryStream();
然后你可以使用output.ToArray()来获取一个字节数组.
请注意,使用using语句而不是单个try / finally块通常会更好 – 否则如果第一次调用Close失败,则不会进行其余操作.你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();
}