int __fastcall sub_401B00(_DWORD *a1, unsigned int *a2, unsigned int a3)
{
  int result; // r0
  unsigned int v6; // r9
  int v7; // r4
  int v8; // r1
  unsigned int v9; // r0
  unsigned int v10; // r3
  char v11; // r5
  int v12; // r2
  _DWORD *v13; // r1

  result = 32774;
  if ( a3 <= 0x419 )
  {
    v6 = a3;
    if ( (a3 & 3) == 0 )
    {
      v7 = 0;
      *a1 = 0;
      a1[1] = 0;
      sub_401464(a1: a1 + 3, a2: 1200);
      v8 = 0;
      v9 = 0;
      do
      {
        do
        {
          v10 = *a2;
          v11 = 4 * v8;
          v12 = v8 + 1;
          a1[v7++ + 3] = (v9 + (*a2 << (4 * v8))) & 0xFFFFFFF;
          v8 = 0;
          v9 = 0;
        }
        while ( v12 == 8 );
        v6 -= 4;
        ++a2;
        v8 = v12;
        v9 = v10 >> (28 - v11);
      }
      while ( v6 != 0 );
      if ( v9 != 0 )
      {
        v13 = &a1[v7++];
        v13[3] = v9 & 0xFFFFFFF;
      }
      *a1 = v7;
      result = 0;
      if ( a1[v7 + 2] == 0 && v7 != 0 )
      {
        do
        {
          if ( a1[v7 + 2] != 0 )
            break;
          *a1 = --v7;
        }
        while ( v7 != 0 );
        return 0;
      }
    }
  }
  return result;
}