将BMP图像读成数组

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

int main(int argc, char *argv[])
{
  int i, fd, ret, fd_out;
  unsigned char buf[16] = "0";
  unsigned char buf_out[6] = "0";

  if (argc != 3) {
  printf("usage: ./bmp_2_c a.bmp a.c/n");
  exit(-1);
  }   

  fd = open(argv[1], 0666, O_RDWR);

  if (fd < 0) {
  perror("open error");
  exit(-1);
  }   

  fd_out = open(argv[2], O_RDWR | O_CREAT, 0644);

  if (fd_out < 0) {
  perror("open error");
  exit(-1);
  }   

while ((ret = read(fd, buf, 16)) != 0) {
  for (i = 0; i < ret; i++) {
  snprintf(buf_out, 6, "0x%x, ", buf[i]);
  if (buf[i] >= 0x0 && buf[i] <= 0xf) {
  buf_out[3] = buf_out[2];
  buf_out[2] = '0';
  buf_out[4] = ',';
  }   
  buf_out[5] = ' ';
  write(fd_out, buf_out, 6);  
  memset(buf_out, 0, sizeof(buf_out));
  }
  write(fd_out, "/n", 1);

  }

  close(fd);
  close(fd_out);
  return 0;
}