initial code and README

README.md

@@ -1,2 +1,6 @@
 # G35EIIcompatibility-tool
+##build
+`gcc main.c -o G35EIIcompatibility-tool.elf`
 
+##use
+`./G35EIIcompatibility-tool.elf input output`

main.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char **argv){
+    if(argc == 1){
+        printf("\033[1;31m");           //red
+        printf("error: ");
+        printf("\033[0;37m");           //white
+        printf("no input and output file!\n");
+        return -1;
+    }
+    if(argc == 2){
+        printf("\033[1;31m");           //red
+        printf("error: ");
+        printf("\033[0;37m");           //white
+        printf("no output file!\n");
+        return -1;
+    }
+
+    if(access(argv[1], F_OK ) == 0) {
+        //none
+    } else {
+        printf("\033[1;31m");           //red
+        printf("error: ");
+        printf("\033[0;37m");           //white
+        printf("cannot open file!\n");
+        return -1;
+    }
+    printf("\033[0;37m");               //white text
+
+    FILE * file;                        //file pointer
+    file = fopen(argv[1], "rb");        //open file
+    fseek(file, 0L, SEEK_END);          //seek file size
+    size_t filesize = ftell(file);      //get file size
+
+    unsigned int filedata[filesize];    //make file data table
+    fread(filedata, filesize, 1, file); //set file data in filedata table
+
+    fclose(file);                       //close input file
+
+    //put here data manipulation
+
+    file = fopen(argv[2], "wb");        //open output file
+
+    //write final data in output file
+    fwrite(filedata , sizeof(char) , filesize , file);
+
+    fclose(file);                       //close output file
+
+    return 1;
+}