int main(int argc, char *argv[])
{
FILE *file;
unsigned num_pixels, sum = 0;
float avg = 0.0;
/* Raises CRE if more than 1 file specified */
assert(argc < 3);
if (argc == 1)
file = stdin;
else /* argc == 2 */
file = fopen(argv[1], "rb");
Pnmrdr_T reader = Pnmrdr_new(file); /* Raises CRE if file is NULL */
Pnmrdr_mapdata data = Pnmrdr_data(reader);
/* Raises CRE if the file is of an incorrect type */
assert(data.type == Pnmrdr_gray);
num_pixels = data.width * data.height;
for (unsigned i = 0; i < num_pixels; i++)
sum += Pnmrdr_get(reader);
avg = sum / (float)(num_pixels * data.denominator);
printf("%0.3f\n", avg);
Pnmrdr_free(&reader);
fclose(file);
exit(EXIT_SUCCESS);
}
/* puts each pixel from reader into the 2D array in order */
UArray2_T pixels_to_array(Pnmrdr_T reader, Pnmrdr_mapdata data, FILE *fp)
{
unsigned pixel, area, i;
int row = 0;
int col = 0;
unsigned *index;
UArray2_T uarray2;
uarray2 = UArray2_new(data.width, data.height, sizeof(unsigned));
area = data.width * data.height;
/* puts each pixel in 2D array */
for (i = 0; i < area; i++) {
pixel = Pnmrdr_get(reader);
index = (unsigned *)UArray2_at(uarray2, col, row);
*index = pixel;
col++;
/* at end of row, reset column to 0 */
if ((unsigned)col >= data.width) {
col = 0;
/* moves down 1 row */
row++;
}
}
if (fp != NULL) {
fclose(fp);
}
Pnmrdr_free(&reader);
return uarray2;
}
/*gets data from reader and checks for pgm format, maxval, height and width*/
Pnmrdr_mapdata check_data(Pnmrdr_T reader, FILE *fp)
{
Pnmrdr_mapdata data;
data = Pnmrdr_data(reader);
if (data.type != Pnmrdr_gray) {
Pnmrdr_free(&reader);
fclose(fp);
exit(1);
}
if (data.denominator != 9) {
Pnmrdr_free(&reader);
fclose(fp);
exit(1);
}
if (data.height != 9 || data.width != 9) {
Pnmrdr_free(&reader);
fclose(fp);
exit(1);
}
return data;
}
Bit2_T pbmread( FILE *input) {
Pnmrdr_T r = Pnmrdr_new(input);
Pnmrdr_mapdata data = Pnmrdr_data(r);
assert(data.type == Pnmrdr_bit);
int w_pixels = data.width;
int h_pixels = data.height;
assert(w_pixels > 0 && h_pixels > 0);
Bit2_T bitmap;
bitmap = Bit2_new(w_pixels, h_pixels);
assert (bitmap);
for ( int j = 0; j < h_pixels; j++) {
for (int i = 0; i < w_pixels; i++) {
int pixel = Pnmrdr_get(r);
Bit2_put(bitmap, i, j, pixel);
}
}
Pnmrdr_free(&r);
return bitmap;
}
/* read_in_solution()
*
* Function takes an empty 2-Dimensional array where the solution will be stored
* for checking and a pointer to the file with the solution to be checked. Using
* the Pnmrdr interface, it ensures that the format of the solution is correct
* and uses a helper function to fill the 2-D array with the puzzle entries.
*/
void read_in_solution(UArray2_T array, FILE *srcfile)
{
void *reader = NULL;
Pnmrdr_mapdata data;
int width = 0;
int height = 0;
int max_intensity = 0;
reader = Pnmrdr_new(srcfile);
data = Pnmrdr_data(reader);
assert(data.type == Pnmrdr_gray);
width = data.width;
height = data.height;
max_intensity = data.denominator;
assert(max_intensity == 9);
assert(width == 9 && height == 9);
UArray2_map_row_major(array, fill_array, reader);
Pnmrdr_free((Pnmrdr_T *)&reader);
}
