Reading an array from a file then writing it to another - arrays

Question

I believe I have a problem with my structure pointer (head), but I'm not sure where I'm doing wrong. It reads the data from the file fine for the headercheck function so I have no clue if that's it or not. I would rather have the structure pointer global, because this is part of a very big program with switch case statements and all that, but it doesn't like that.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define maxheight 1080
#define maxwidth 1920
#define RGB_COMPONENT_COLOUR 255
#define pgmtype "P2"
#define ppmtype "P3"
typedef struct {
int x, y;
}
PPMImage;
typedef struct {
int rgb_comp_colour;
char filetype[2];
int height;
int width;
}
PPMHead;
/*PPMHead head[3];
{
head[3].filetype;
head[3].height;
head[3].width;
}
PPMHead *ptr_head = NULL;
ptr_head = head;*/
PPMPixel * data; //Defines pointer to PPMPixel
int ** Array; //Double pointer defines as a pointer pointing to a pointer that is pointing to an integer
PPMPixel ** RGBArray; //Double pointer defines as a pointer pointing to a pointer that is pointing to the PPMPixel structure
FILE * fp;
int r, g, b;
void headercheck() {
PPMHead * ptr_head, head;
ptr_head = & head;
fscanf(fp, "%s %d %d %d", head.filetype, & head.width, & head.height, & head.rgb_comp_colour);
printf("%s %d %d %d", head.filetype, head.width, head.height, head.rgb_comp_colour);
if (head.width > maxwidth || head.height > maxheight) {
printf("\tInvalid image size. The maximum value of image is 1920x1080.\n");
printf("\tImage size is %d x %d\n", head.width, head.height);
} else {
printf("\tImage size is valid\n");
printf("\tImage size is %d x %d\n", head.width, head.height);
}
if ((strcmp(head.filetype, pgmtype) != 0) && (strcmp(head.filetype, ppmtype) != 0)) {
printf("\tInvalid filetype\n");
} else {
if (strcmp(head.filetype, pgmtype) == 0) {
printf("\t File is PGM type image\n");
} else {
if (strcmp(head.filetype, ppmtype) == 0) {
printf("\t File is PPM type image\n");
}
}
}
if ((head.rgb_comp_colour == RGB_COMPONENT_COLOUR)) {
printf("\t Image is 8 bit\n");
} else {
if (head.rgb_comp_colour > RGB_COMPONENT_COLOUR) {
printf("Maximum bit-depth is 8 bits\n");
} else {
printf("\tImage is not 8 bit\n");
}
}
}
int main(void) {
PPMHead * ptr_head, head;
ptr_head = & head;
char fname[100];
printf("Enter file name: ");
scanf("%s", fname);
fseek(stdin, 0, SEEK_END);
fp = fopen(fname, "r");
if (fp == NULL) {
printf("\tError while opening the file\n");
} else {
printf("\tReading in %s\n", fname);
}
//Checking for comments
//Skip whitespace and comments
headercheck();
if (strcmp(head.filetype, pgmtype) == 0) {
printf("\tReading in PGM image...\n");
* Array = malloc(head.width * sizeof(int * )); //Points to malloc
for (int i = 0; i < head.width; i++) {
Array[i] = (int * ) malloc(head.height * sizeof(int));
if ((Array = NULL)) {
printf("Error allocating memory to the array");
} else {
printf("Memory allocated to the PGM array sucessfully");
}
}
for (int j = 0; j < head.height; j++) {
for (int i = 0; i < head.width; i++) {
fscanf(fp, "%3d ", & Array[i][j]); //Scans the address of Array[i][j]
}
}
}
fclose(fp);
//Save PPM Array Into New PPM File
FILE * pf;
int i, j;
char fname2[100];
printf("Enter file name: ");
scanf("%s", fname2);
fseek(stdin, 0, SEEK_END);
pf = fopen(fname2, "w");
if (pf == NULL) {
printf("\tError while opening the file\n");
} else {
printf("\tWriting in %s\n", fname2);
}
if (strcmp(head.filetype, pgmtype) == 0) {
for (j = 0; j < head.height; j++) {
fprintf(pf, "\n");
for (i = 0; i < head.width; i++) {
fprintf(pf, "%3d ", Array[i][j]);
//fprintf(pf, "%3d ", **(Array+j*head[0].width + i));
}
}
}
fclose(pf);
for (int i = 0; i < head.width; i++) {
free(Array[i]);
Array[i] = NULL;
}
free(Array);
Array = NULL;
return 0;
}