Add Soc::init_with_buffer_size

ctru-rs/src/services/soc.rs

@@ -8,12 +8,14 @@ pub struct Soc {
 
 impl Soc {
     pub fn init() -> ::Result<Soc> {
-        const SOC_MEM_SIZE: usize = 0x100000;
+        Soc::init_with_buffer_size(0x100000)
+    }
 
+    pub fn init_with_buffer_size(num_bytes: usize) -> ::Result<Soc> {
         unsafe {
-            let soc_mem = memalign(0x1000, SOC_MEM_SIZE) as *mut u32;
+            let soc_mem = memalign(0x1000, num_bytes) as *mut u32;
 
-            let r = socInit(soc_mem, SOC_MEM_SIZE as u32);
+            let r = socInit(soc_mem, num_bytes as u32);
             if r < 0 {
                 Err(r.into())
             } else {