Code i'm stuck on

#include <defs.h>
#include <windows.h>
#include <math.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

__int64 __fastcall common_ftell<__int64>(_QWORD); // weak
__int64 __fastcall common_ftell<long>(_QWORD); // weak
void *__cdecl j__malloc_base(size_t Size);
void __cdecl j__free_base(void *Block);

void *__fastcall sub_180093880(size_t *a1, const char *a2)
{
  FILE *v3; // rax
  FILE *v4; // rdi
  size_t v5; // rbp
  void *v6; // rsi
  size_t v7; // rbx
  void *result; // rax

  if ( !a2 )
    return 0i64;
  v3 = fopen(a2, "rb");
  v4 = v3;
  if ( !v3 )
    return 0i64;
  fseek(v3, 0, 2);
  v5 = (int)common_ftell<long>(v4);
  fseek(v4, 0, 0);
  v6 = j__malloc_base(v5);
  v7 = fread(v6, 1ui64, v5, v4);
  ftell(v4);
  if ( v7 == v5 )
  {
    *a1 = v5;
    result = v6;
  }
  else
  {
    j__free_base(v6);
    result = 0i64;
  }
  return result;
}