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#include "../../include/std/buffer.h"
#include "../../include/std/alloc.h"
#include "../../include/std/mem.h"
#include "../../include/std/arena_allocator.h"
#include <assert.h>
int buffer_init(Buffer *self, struct ArenaAllocator *allocator) {
self->data = NULL;
self->size = 0;
self->capacity = 0;
self->allocator = allocator;
if(allocator) {
return arena_allocator_add_mem(allocator, &self->allocator_index);
} else {
self->allocator_index = ~(usize)0;
return 0;
}
}
void buffer_deinit(Buffer *self) {
assert(!self->allocator && "Can't deinit buffer if it has an allocator");
am_free(self->data);
self->data = NULL;
self->size = 0;
self->capacity = 0;
}
static CHECK_RESULT int buffer_ensure_capacity(Buffer *self, usize new_capacity) {
usize capacity;
void *new_mem;
int alloc_result;
if(self->capacity >= new_capacity)
return BUFFER_OK;
capacity = self->capacity;
if(capacity == 0) {
capacity = new_capacity;
} else {
while(capacity < new_capacity) {
capacity *= 1.5;
}
}
alloc_result = am_realloc(self->data, capacity, &new_mem);
if(alloc_result != ALLOC_OK)
return BUFFER_ALLOC_FAIL;
self->data = new_mem;
self->capacity = capacity;
/* Update list of buffers in the allocator with the new address of the buffer data */
if(self->allocator)
am_memcpy(self->allocator->mems.data + sizeof(void*) * self->allocator_index, &self->data, sizeof(void*));
return BUFFER_OK;
}
int buffer_append(Buffer *self, const void *data, usize size) {
assert(data);
return_if_error(buffer_ensure_capacity(self, self->size + size));
am_memcpy(self->data + self->size, data, size);
self->size += size;
return BUFFER_OK;
}
int buffer_append_empty(Buffer *self, usize size) {
return_if_error(buffer_ensure_capacity(self, self->size + size));
self->size += size;
return BUFFER_OK;
}
int buffer_expand(Buffer *self, usize size) {
return buffer_ensure_capacity(self, self->size + size);
}
void* buffer_get(Buffer *self, usize index, usize type_size) {
usize real_index;
real_index = index * type_size;
assert(real_index < self->size);
return &self->data[real_index];
}
int buffer_pop(Buffer *self, void *data, usize size) {
if(size > self->size)
return -1;
am_memcpy(data, &self->data[self->size - size], size);
self->size -= size;
return 0;
}
void buffer_clear(Buffer *self) {
self->size = 0;
}
void* buffer_begin(Buffer *self) {
return self->data;
}
void *buffer_end(Buffer *self) {
return self->data + self->size;
}
usize __buffer_get_size(Buffer *self, usize type_size) {
assert(type_size != 0);
return self->size / type_size;
}
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