picturebrowser.c

PictureBrowser 是基于Altera 的DE2 开发板设计图像浏览器

#include <stdio.h>
#include <errno.h> //needed for errnum
#include <string.h>//needed for strerror
#include <shimix_pio_button.h>

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

#define BUTTON_DEVICE "/dev/shimix"


static char* pics [100];
//pics = (char *) malloc(100);
static int count = 0;

void get_file_info(char *name, char *path){
  struct stat file_stats;
  if(stat(name, &file_stats) == -1){
    printf("\nFailed to access %s\n", name);
    return;
  }
  printf("\nFile found!\n");
  printf(  "        File name: %s\n", name);
  printf(  "    Relative path: %s\n", path);
  printf(  "  Protection mode: %d\n", file_stats.st_mode);
  printf(  " User id of owner: %d\n", file_stats.st_uid); 
  printf(  "Group id of owner: %d\n", file_stats.st_gid);
  printf(  "    Size in bytes: %d\n", file_stats.st_size);
  if(count < 100){
    if(file_stats.st_size <= 20000){
      pics[count]= strdup(name);
      printf("Added pic[%d] = %s\n",count, name);
      count ++;
    }
    else{
      printf("File is too big. Skipping file...\n");
    }
      
  }
  if((file_stats.st_mode & S_IFMT) == S_IFDIR){
    printf("The file is a directory.\n\n");
  }
}
  
void str_tolower(char *s)
 {
     while(*s)
     {
         *s=tolower(*s);
         s++;
     }
 }

  
int StartSearch(char *name, char *path, int found_signal){
  
  DIR *dfd;
  struct dirent *dp;
  struct stat file_stat;

  if((dfd = opendir(path)) == NULL){
    printf("Directory [%s], failed to open.", path);
    return;
  }
  while (( dp = readdir(dfd)) != NULL){
    if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0){
      continue; /*skipping itself and parent directories*/
    }
    char slash[2] = "/";

    char *path_cpy = (char *) malloc(sizeof(char)*strlen(path)+strlen(dp->d_name)+2);
    strcpy(path_cpy, path);

    char *d_nameCopy = (char *) malloc(sizeof(char)*strlen(dp->d_name)+2);
    strcpy(d_nameCopy, dp->d_name);

    char *combined = strcat(path_cpy, slash);
    char *full_name = strcat(combined, dp->d_name);

    if(stat(full_name, &file_stat) == -1){
      printf("\nFailed to access: %s\nSkipping...\n ", full_name);
      continue; /*skip bad file or directory*/
    } 
    if((file_stat.st_mode & S_IFMT) == S_IFDIR){
      StartSearch(name, full_name, found_signal); /*recursive search*/
    }

    str_tolower(d_nameCopy);

    if(strstr(d_nameCopy, name)){
      get_file_info(full_name, path);
      found_signal = 1;
      //FILE FOUND!!!
    }

    free(path_cpy);
    free(d_nameCopy);
  }
  closedir(dfd);
  return found_signal;
}


int main(int argc, char *argv[])
{
  FILE * fButton;          //handle to button device
  char buf[1]; //read buffer to store value of button pushed when read from fButton
  int numBytesRead = 0;
  char keyInput = 0;
  unsigned int ioctlCmd;
  printf("Launching button reader v1.3\n");
  
/* Establishing the root directory */
  char* initial_path = "mnt";
  int found_signal = 0;
  char * jpg = ".jpeg";
  int find = StartSearch(jpg, initial_path, found_signal);
  jpg= ".jpg";
  find = StartSearch(jpg, initial_path, found_signal);

  char modprobe[28] =   "modprobe\tshimix_pio_button";
  char makeDevice[29] = "mknod\t/dev/shimix\tc\t63\t0";
  //printf("mknod is ran\n\n");
  int x = system(modprobe);
  x = system(makeDevice);
  
  fButton = fopen(BUTTON_DEVICE, "r"); //open button device for read-only
  if (fButton==NULL) {
    printf("Error opening up %s\n", BUTTON_DEVICE);
    return -1;
  }

  ioctl(fileno(fButton), SBLD_IOCT_LEDBUTTONNUM, 1); //enable displaying button pushed
  ioctl(fileno(fButton), SBLD_IOCT_LEDCOUNTER, 1);   //enable button counters
  
  printf("Entering main loop\n\n");
  
  char command1[8] = "nano-X&";
  char killall[20] = "killall\t-9\tnano-X";
  // position of our cursor through the pics
  int pos = 0;
  int j;
  char andPersand[4] = "\t&";
  char resize[6] = "\t12&";
  char nxview[9] = "nxview\t";
  char *command2;
  short first_time = 0;


  while (keyInput!='q' && keyInput!='Q') {
    printf("awaiting button: ");
    if ((numBytesRead=read(fileno(fButton), buf, sizeof(char), 0))<= 0) { //if no bytes read or error
      printf("Error reading %s\n", BUTTON_DEVICE);
    }
    else {
      x = system(killall);
      j = sleep(1);
      if(first_time == 0){
	printf("executing command nano-X....\n");
	x = system(command1);
	j = sleep(1);
	command2 = (char *) malloc(sizeof(char)*strlen(nxview));
	strcpy(command2, nxview);
	printf("%d %u\n", buf[0], buf[0]);
	strcat(command2, pics[pos]);
	strcat(command2, andPersand);
	printf("executing %s ....\n",command2); 
	x = system(command2);
	j = sleep(1);
	free(command2);
	first_time = 1;
      }
      else{
	if (buf[0] == 2) {
	  printf("executing command nano-X....\n");
	  x = system(command1);
	  j = sleep(1);
	  command2 = (char *) malloc(sizeof(char)*strlen(nxview));
	  strcpy(command2, nxview);
	  printf("%d %u\n", buf[0], buf[0]);
	  if (pos == count-1){
	    pos = 0;
	  }
	  else{
	    pos = pos + 1;
	  }
	  strcat(command2, pics[pos]);
	  strcat(command2, andPersand);
	  printf("executing %s ....\n",command2); 
	  x = system(command2);
	  j = sleep(1);
	  free(command2);
	}
	else{
	  if (buf[0] == 4) {
	    printf("executing command nano-X....\n");
	    x = system(command1);
	    j = sleep(1);
	    command2 = (char *) malloc(sizeof(char)*strlen(nxview));
	    strcpy(command2, nxview);
	    printf("%d %u\n", buf[0], buf[0]);
	    if (pos <= 0){
	      pos = count-1;
	    }
	    else{
	      pos  = pos - 1;
	    }
	    strcat(command2, pics[pos]);
	    strcat(command2, andPersand);
	    printf("executing %s ....\n",command2); 
	    x = system(command2);
	    j = sleep(1);
	    free(command2);
	  }
	  else{
	    if (buf[0] == 8){
	      printf("executing command nano-X....\n");
	      x = system(command1);
	      j = sleep(1);
	      command2 = (char *) malloc(sizeof(char)*strlen(nxview));
	      strcpy(command2, nxview);
	      printf("%d %u\n", buf[0], buf[0]); 
	      strcat(command2, pics[pos]);
	      strcat(command2, resize);
	      printf("executing %s ....\n",command2); 
	      x = system(command2);
	      j = sleep(1);
	      free(command2);
	    }
	  }
	}
      }
    }
      //printf("Press q to quit or any other key to continue reading buttons\n");
      //keyInput = getchar();
  }
  int i;
  for(i = 0; i < count; i++){
    free(pics[i]);	
  }
  
  printf("Button Reader terminating\n");
}