八叶草

学习资料记录

移除bzImage文件中'1f8b08'之前内容，存为gz文件

 

#include <stdlib.h>
#include <stdio.h>

int _tmain(int argc, _TCHAR* argv[])
{
    FILE* r=fopen("linux26","rb");
    FILE* w=fopen("linux26.gz","wb");
    int s=0;
    for(;;)
    {
        unsigned char c;
        int l=fread(&c,1,1,r);
        if(l>=1)
        {
            if(s==3)
            {
                fwrite(&c,1,1,w);
            }
            else if(s==2)
            {
                if(c==0x08)
                {
                    c=0x1f;
                    fwrite(&c,1,1,w);
                    c=0x8b;
                    fwrite(&c,1,1,w);
                    c=0x08;
                    fwrite(&c,1,1,w);
                    ++s;
                }
                else
                {
                    s=0;
                }
            }
            else if(s==1)
            {
                if(c==0x8b)
                {
                    ++s;
                }
                else
                {
                    s=0;
                }
            }
            else if(s==0)
            {
                if(c==0x1f)
                {
                    ++s;
                }
            }
        }
        else
        {
            break;
        }
    }
    fclose(w);
    fclose(r);
    return 0;
}

 

posted on 2012-10-29 16:02 八叶草 阅读(637) 评论(0)  编辑 收藏 引用 所属分类: linux


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