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ot::Utils::Block class
Represents a memory block. A block is of the structure as below. +------------------------------+ | mSize | mMemory | mNext | |---------|----------| --------| | 2 bytes | n bytes | 2 bytes | +------------------------------+ Since block metadata is of 4-byte size, mSize and mNext are separated at the beginning and end of the block to make sure the mMemory is aligned with long.
Syntax
class Block
{
friend class Heap;
public:
uint16_t GetSize(void) const { return mSize; }
void SetSize(uint16_t aSize) { mSize = aSize; }
uint16_t GetNext(void) const
{
return *reinterpret_cast<const uint16_t *>(
reinterpret_cast<const void *>(reinterpret_cast<const uint8_t *>(this) + sizeof(mSize) + mSize));
}
void SetNext(uint16_t aNext)
{
*reinterpret_cast<uint16_t *>(
reinterpret_cast<void *>(reinterpret_cast<uint8_t *>(this) + sizeof(mSize) + mSize)) = aNext;
}
void *GetPointer(void) { return &mMemory; }
uint16_t GetLeftNext(void) const { return *(&mSize - 1); }
bool IsLeftFree(void) const { return GetLeftNext() != 0; }
bool IsFree(void) const { return mSize != kGuardBlockSize && GetNext() != 0; }
private:
static constexpr uint16_t kGuardBlockSize = 0xffff;
uint16_t mSize;
uint8_t mMemory[sizeof(uint16_t)];
};
Fields
Field
Declared as
uint16_t
uint8_t[sizeof(uint16_t)]
Related Functions
Found 6 other functions taking a Block
argument:
Function
Description
Returns the offset of @p aBlock.
Returns the free block after @p aBlock in the free block list.
Returns the block on the right side of @p aBlock.
Inserts @p aBlock into the free block list. The free block list is single linked and is sorted by size from minimal to maximum.
Returns the free block before @p aBlock in the free block list.
Returns whether the block on the left side of @p aBlock is free.