如何在Java应用程序中读取8位和24位MicrosoftWindows位图 (2)

ading:"+sdir+sfile);
try
{
FileInputStream fs=new FileInputStream(sdir+sfile);
int bflen=14; // 14 字节 BITMAPFILEHEADER
byte bf[]=new byte[bflen];
fs.read(bf,0,bflen);
int bilen=40; // 40 字节 BITMAPINFOHEADER
byte bi[]=new byte[bilen];
fs.read(bi,0,bilen);

// 解释数据。
int nsize = (((int)bf[5]&0xff)<<24)
| (((int)bf[4]&0xff)<<16)
| (((int)bf[3]&0xff)<<8)
| (int)bf[2]&0xff;
System.out.println("File type is :"+(char)bf[0]+(char)bf[1]);
System.out.println("Size of file is :"+nsize);

int nbisize = (((int)bi[3]&0xff)<<24)
| (((int)bi[2]&0xff)<<16)
| (((int)bi[1]&0xff)<<8)
| (int)bi[0]&0xff;
System.out.println("Size of bitmapinfoheader is :"+nbisize);

int nwidth = (((int)bi[7]&0xff)<<24)
| (((int)bi[6]&0xff)<<16)
| (((int)bi[5]&0xff)<<8)
| (int)bi[4]&0xff;
System.out.println("Width is :"+nwidth);

int nheight = (((int)bi[11]&0xff)<<24)
| (((int)bi[10]&0xff)<<16)
| (((int)bi[9]&0xff)<<8)
| (int)bi[8]&0xff;
System.out.println("Height is :"+nheight);

int nplanes = (((int)bi[13]&0xff)<<8) | (int)bi[12]&0xff;
System.out.println("Planes is :"+nplanes);

int nbitcount = (((int)bi[15]&0xff)<<8) | (int)bi[14]&0xff;
System.out.println("BitCount is :"+nbitcount);

// 查找表明压缩的非零值
int ncompression = (((int)bi[19])<<24)
| (((int)bi[18])<<16)
| (((int)bi[17])<<8)
| (int)bi[16];
System.out.println("Compression is :"+ncompression);

int nsizeimage = (((int)bi[23]&0xff)<<24)
| (((int)bi[22]&0xff)<<16)
| (((int)bi[21]&0xff)<<8)
| (int)bi[20]&0xff;
System.out.println("SizeImage is :"+nsizeimage);

int nxpm = (((int)bi[27]&0xff)<<24)
| (((int)bi[26]&0xff)<<16)
| (((int)bi[25]&0xff)<<8)
| (int)bi[24]&0xff;
System.out.println("X-Pixels per meter is :"+nxpm);

int nypm = (((int)bi[31]&0xff)<<24)
| (((int)bi[30]&0xff)<<16)
| (((int)bi[29]&0xff)<<8)
| (int)bi[28]&0xff;
System.out.println("Y-Pixels per meter is :"+nypm);

int nclrused = (((int)bi[35]&0xff)<<24)
| (((int)bi[34]&0xff)<<16)
| (((int)bi[33]&0xff)<<8)
| (int)bi[32]&0xff;
System.out.println("Colors used are :"+nclrused);

int nclrimp = (((int)bi[39]&0xff)<<24)
| (((int)bi[38]&0xff)<<16)
| (((int)bi[37]&0xff)<<8)
| (int)bi[36]&0xff;
System.out.println("Colors important are :"+nclrimp);

if (nbitcount==24)
{
// 24 位格式不包含调色板数据，但扫描行被补足到
// 4 个字节。
int npad = (nsizeimage / nheight) - nwidth * 3;
int ndata[] = new int [nheight * nwidth];
byte brgb[] = new byte [( nwidth + npad) * 3 * nhe