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typedef struct Arena {
unsigned char *buf;
usize buf_len;
usize curr_offset;
usize prev_offset;
} Arena;
PODEF void p_arena_create(Arena *a, void *backing_buffer, usize backing_buffer_length);
PODEF void* p_arena_alloc_align(Arena *a, usize s, usize align);
PODEF void* p_arena_alloc(Arena *a, usize s);
PODEF void* p_arena_resize_align(Arena *a, void *old_memory, usize old_size, usize new_size, usize align);
PODEF void* p_arena_resize(Arena *a, void *old_memory, usize old_size, usize new_size);
PODEF void p_arena_free_all(Arena *a);
PODEF void p_arena_destroy(Arena* a);
typedef struct { u8 padding; } Stack_Allocation_Header;
typedef struct Stack {
unsigned char *buf;
usize buf_len;
usize offset;
} Stack;
PODEF void p_stack_create(Stack *s, void *backing_buffer, usize backing_buffer_length);
PODEF usize calc_padding_with_header(uintptr ptr, uintptr alignment, usize header_size);
PODEF void* p_stack_alloc(Stack *s, usize len, usize alignment);
PODEF void p_stack_free(Stack *s, void *ptr);
PODEF void p_stack_free_all(Stack* s);
PODEF void p_stack_destroy(Stack* s);
typedef struct Pool_Free_Node Pool_Free_Node;
typedef struct Pool {
unsigned char *buf;
usize chunk_size;
usize pool_size;
Pool_Free_Node *head;
} Pool;
struct Pool_Free_Node { struct Pool_Free_Node *next; };
PODEF void p_pool_create(Pool *p, void *buf, usize buf_len, usize chunk_size, usize chunk_align);
PODEF void* p_pool_alloc(Pool *p);
PODEF void p_pool_free(Pool *p, void *ptr);
PODEF void p_pool_free_all(Pool *p);
PODEF void p_pool_destroy(Pool *p);
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