c++和java字节高低位的转换.docVIP

c++和java字节高低位的转换 现在我们需要从一个C/C++语言生成的二进制文件中读出一个float数据? //?参见java.io.DataInputStream?? //?C++写入的字节顺序是从低到高（左低到右高），?? ???而java.io.DataInputStream读取的数据是从高到低（左高到右低)?? //?所以需要自己改写一下?? //?功能和java.io.DataInputStream类似的?? public?class?CppInputStream?extends?FilterInputStream?{?? ?? ??public?CppInputStream(InputStream?in)?{?? ????super(in);?? ??}?? ??public?final?int?read(byte?b[])?throws?IOException?{?? ????return?in.read(b,?0,?b.length);?? ??}?? ?? ??public?final?int?read(byte?b[],?int?off,?int?len)?throws?IOException?{?? ????return?in.read(b,?off,?len);?? ??}?? ?? ??public?final?void?readFully(byte?b[])?throws?IOException?{?? ????readFully(b,?0,?b.length);?? ??}?? ?? ??public?final?void?readFully(byte?b[],?int?off,?int?len)?throws?IOException?{?? ????if?(len??0)?? ??????throw?new?IndexOutOfBoundsException();?? ????int?n?=?0;?? ????while?(n??len)?{?? ??????int?count?=?in.read(b,?off?+?n,?len?-?n);?? ??????if?(count??0)?? ????????throw?new?EOFException();?? ??????n?+=?count;?? ????}?? ??}?? ?? ??public?final?int?skipBytes(int?n)?throws?IOException?{?? ????int?total?=?0;?? ????int?cur?=?0;?? ????while?((total??n)??((cur?=?(int)?in.skip(n?-?total))??0))?{?? ??????total?+=?cur;?? ????}?? ????return?total;?? ??}?? ?? ??public?final?byte?readByte()?throws?IOException?{?? ????int?ch?=?in.read();?? ????if?(ch??0)?? ??????throw?new?EOFException();?? ????return?(byte)?(ch);?? ??}?? ?? ??public?final?int?readUnsignedByte()?throws?IOException?{?? ????int?ch?=?in.read();?? ????if?(ch??0)?? ??????throw?new?EOFException();?? ????return?ch;?? ??}?? ?? ??public?final?short?readShort()?throws?IOException?{?? ????int?ch2?=?in.read();?? ????int?ch1?=?in.read();?? ????if?((ch1?|?ch2)??0)?? ??????throw?new?EOFException();?? ????return?(short)?((ch1??8)?+?(ch2??0));?? ??}?? ?? ??public?final?int?readUnsignedShort()?throws?IOException?{?? ????int?ch2?=?in.read();?? ????int?ch1?=?in.read();?? ????if?((ch1?|?ch2)??0)?? ??????throw?new?EOFException();?? ????return?(ch1??8)?+?(ch2??0);?? ??}?? ?? ??p