Added (linear/vram/mappable)GetSize for retrieving allocated buffer size

libctru/include/3ds/allocator/linear.h

@@ -28,6 +28,12 @@ void* linearMemAlign(size_t size, size_t alignment);
  */
 void* linearRealloc(void* mem, size_t size);
 
+/**
+ * @brief Retrieves the allocated size of a buffer.
+ * @return The size of the buffer.
+ */
+size_t linearGetSize(void* mem);
+
 /**
  * @brief Frees a buffer.
  * @param mem Buffer to free.

libctru/include/3ds/allocator/mappable.h

@@ -5,15 +5,21 @@
 #pragma once
 
 /**
- * @brief Allocates a page-aligned buffer.
+ * @brief Reserves a mappable memory area.
- * @param size Size of the buffer to allocate.
+ * @param size Size of the area to reserve.
- * @return The allocated buffer.
+ * @return The mappable area.
  */
 void* mappableAlloc(size_t size);
 
 /**
- * @brief Frees a buffer.
+ * @brief Retrieves the allocated size of a mappable area.
- * @param mem Buffer to free.
+ * @return The size of the mappable area.
+ */
+size_t mappableGetSize(void* mem);
+
+/**
+ * @brief Frees a mappable area.
+ * @param mem Mappable area to free.
  */
 void mappableFree(void* mem);
 

libctru/include/3ds/allocator/vram.h

@@ -28,6 +28,12 @@ void* vramMemAlign(size_t size, size_t alignment);
  */
 void* vramRealloc(void* mem, size_t size);
 
+/**
+ * @brief Retrieves the allocated size of a buffer.
+ * @return The size of the buffer.
+ */
+size_t vramGetSize(void* mem);
+
 /**
  * @brief Frees a buffer.
  * @param mem Buffer to free.

libctru/source/allocator/linear.cpp

@@ -71,6 +71,12 @@ void* linearRealloc(void* mem, size_t size)
 	return NULL;
 }
 
+size_t linearGetSize(void* mem)
+{
+	auto node = getNode(mem);
+	return node ? node->chunk.size : 0;
+}
+
 void linearFree(void* mem)
 {
 	auto node = getNode(mem);

libctru/source/allocator/mappable.cpp

@@ -43,6 +43,12 @@ void* mappableAlloc(size_t size)
 	return chunk.addr;
 }
 
+size_t mappableGetSize(void* mem)
+{
+	auto node = getNode(mem);
+	return node ? node->chunk.size : 0;
+}
+
 void mappableFree(void* mem)
 {
 	auto node = getNode(mem);

libctru/source/allocator/vram.cpp

@@ -68,6 +68,12 @@ void* vramRealloc(void* mem, size_t size)
 	return NULL;
 }
 
+size_t vramGetSize(void* mem)
+{
+	auto node = getNode(mem);
+	return node ? node->chunk.size : 0;
+}
+
 void vramFree(void* mem)
 {
 	auto node = getNode(mem);