android dump 分区

有的时候需要dump分区的raw data(没有文件系统)进行分析

 /*
 *   out put  raw partition image
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define PRELOADER		"/dev/preloader"
#define BOOTLOADER		"/dev/uboot"
#define RECOVERYIMG	"/dev/recovery"

#define BUFFERSIZE   (1*1024*1024)
static char buff[BUFFERSIZE];


int dumpPartition(char * name, int size)
{
	int  i = 0,ret =0;
       int  fdin, fdout;
	
	char * inputname[256]={0x00};
	char * outputname[256]={0x00};

	sprintf(inputname,"/dev/%s",name);
	sprintf(outputname,"/data/%s.dump",name);

	printf("inputname is %s , and outputname is %s \n",inputname,outputname);

       
	fdin = open(inputname, O_RDONLY);

       if ((fdin = open (inputname,O_RDONLY)) < 0) {
             printf("create %s  failed\n",inputname);
             exit(1);
       }

       if ((fdout = open (outputname, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0) {
             printf("create %s  failed \n",outputname);
             exit(1);
       }
	  
       printf("size is  %d \n",size);
	for(i=0;i<size;i++)
	{
	    ret=read(fdin,buff,BUFFERSIZE);
	    printf("read %d from %s \n",ret,inputname);
	    ret=write(fdout,buff,BUFFERSIZE);
	    printf("write %d to %s \n",ret,outputname);
	}
	
       close(fdin);
	close(fdout);
	return 0;
}
void showhelp()
{
     printf("./rawdump  part_name  size_m\n");
     printf("eg  :  ./rawdump  uboot  1 \n");
     printf("please try again \n");
     return ;
}

int main(int argc, char *argv[])
{

	if(argc!=3)
	{
	    showhelp();
	    exit(1);
	}
	char * name = argv[1];
	int size = atoi(argv[2]);

	dumpPartition(name, size);
	return 0;
}

具体用法，先编译之，adb push  到 android设备

./rawdump     分区名      需要导出的分区大小