Implemented file reader function

src/main.c

@@ -6,32 +6,32 @@
 #include "magic_memory.h"
 #include "pixeldata_utils.h"
 #include "ciff_tools.h"
+#include "utils.h"
 
 int main() {
     magic_memory_context_t *context = magic_memory_begin();
 
+    uint8_t *ciff_file;
+    uint64_t ciff_size;
+    uint8_t result = read_file_to_mem(context, "/home/marcsello/Documents/etyetem/szamitobiztonsag/caff/1.ciff",
+                                      67108864, &ciff_file, &ciff_size);
 
-    FILE *fp = fopen("/home/marcsello/Documents/etyetem/szamitobiztonsag/caff/1.ciff", "rb");
-
-    fseek(fp, 0L, SEEK_END);
-    uint64_t fsize = ftell(fp);
-    fseek(fp, 0L, SEEK_SET);
-
-    uint8_t *ciff_file = (uint8_t *) magic_malloc(context, fsize);
-    fread(ciff_file, 1, fsize, fp);
-    fclose(fp);
+    if (result != FILE_READ_SUCCESS) {
+        printf("File read failure: %d", result);
+        return 1;
+    }
 
     uint64_t width;
     uint64_t height;
     uint64_t pixel_data_starts;
 
-    uint8_t result = parse_ciff_from_mem(ciff_file, fsize, &width, &height, &pixel_data_starts);
+    result = get_pixel_data_from_ciff(ciff_file, ciff_size, &width, &height, &pixel_data_starts);
 
     uint64_t pixel_data_size = width * height * 3;
 
     if (result == CIFF_PARSE_SUCCESS) {
 
-        uint8_t *flipped_image = (uint8_t *) magic_malloc(context, fsize - pixel_data_starts);
+        uint8_t *flipped_image = (uint8_t *) magic_malloc(context, ciff_size - pixel_data_starts);
         if (flip_image(ciff_file + pixel_data_starts, flipped_image, pixel_data_size, width, height) !=
             IMAGE_FLIP_SUCCESS) {
             printf("Literally failed to flip the image");

src/utils.c

@@ -2,9 +2,12 @@
 // Created by marcsello on 05/11/2020.
 //
 
+#include <stdio.h>
+
 #include "utils.h"
 
-bool contains(const uint8_t* data, uint64_t data_len, uint8_t what) {
+
+bool contains(const uint8_t *data, uint64_t data_len, uint8_t what) {
     for (uint64_t i = 0; i < data_len; i++) {
         if (data[i] == what) {
             return true;
@@ -12,3 +15,41 @@ bool contains(const uint8_t* data, uint64_t data_len, uint8_t what) {
     }
     return false;
 }
+
+uint8_t read_file_to_mem(mm_ctx context, const char *filename, uint64_t max_len, uint8_t **data, uint64_t *data_len) {
+    FILE *fp = fopen(filename, "rb");
+
+    if (fp == NULL) {
+        return FILE_READ_COULD_NOT_OPEN;
+    }
+
+    fseek(fp, 0L, SEEK_END);
+    uint64_t fsize = ftell(fp);
+
+    if (fsize > max_len) {
+        fclose(fp);
+        return FILE_READ_TOO_BIG;
+    }
+
+    fseek(fp, 0L, SEEK_SET);
+
+    uint8_t *contents = (uint8_t *) magic_malloc(context, fsize);
+
+    if (contents == NULL) {
+        fclose(fp);
+        return FILE_READ_COULD_NOT_ALLOCATE;
+    }
+
+    uint64_t bytes_read = fread(contents, 1, fsize, fp);
+
+    if (bytes_read != fsize) {
+        fclose(fp);
+        return FILE_READ_ERROR;
+    }
+
+    *data = contents;
+    *data_len = fsize;
+
+    fclose(fp);
+    return FILE_READ_SUCCESS;
+}

src/utils.h

@@ -8,7 +8,16 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#include "magic_memory.h"
+
+#define FILE_READ_COULD_NOT_OPEN 1
+#define FILE_READ_TOO_BIG 2
+#define FILE_READ_COULD_NOT_ALLOCATE 3
+#define FILE_READ_ERROR 4
+#define FILE_READ_SUCCESS 0
+
 bool contains(const uint8_t *data, uint64_t data_len, uint8_t what);
 
+uint8_t read_file_to_mem(mm_ctx context, const char *filename, uint64_t max_len, uint8_t **data, uint64_t *data_len);
 
 #endif //CAFF_PREVIEWER_UTILS_H