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Add function to create array from preallocated buffer

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Abdelrahman Said
2026-01-24 20:45:52 +00:00
parent 7a54c28c0f
commit 8e41b627bc
2 changed files with 26 additions and 7 deletions
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31
src/base/array/array.c
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@@ -227,21 +227,38 @@ GenericArray _array_alloc_capacity(const Allocator *allocator, u64 capacity, Arr
GenericArray output = NULL; GenericArray output = NULL;
u64 allocation_size = _array_calc_alloc_size(capacity, item_size); u64 allocation_size = _array_calc_alloc_size(capacity, item_size);
ArrayHeader *header = wapp_mem_allocator_alloc(allocator, allocation_size); void *buffer = wapp_mem_allocator_alloc(allocator, allocation_size);
if (!header) { if (!buffer) {
goto RETURN_ARRAY_ALLOC; goto RETURN_ARRAY_ALLOC;
} }
output = (u8 *)(header + 1); output = _array_from_preallocated_buffer(buffer, allocation_size, flags, item_size);
header->magic = WAPP_ARRAY_MAGIC;
header->count = flags & ARRAY_INIT_FILLED ? capacity : 0;
header->capacity = capacity;
header->item_size = item_size;
RETURN_ARRAY_ALLOC: RETURN_ARRAY_ALLOC:
return output; return output;
} }
GenericArray _array_from_preallocated_buffer(void *buffer, u64 buffer_size, ArrayInitFlags flags,
u64 item_size) {
wapp_runtime_assert(buffer != NULL, "`buffer` should not be NULL");
i64 data_buffer_size = (i64)buffer_size - (i64)(sizeof(ArrayHeader));
if (data_buffer_size <= 0) {
return NULL;
}
u64 item_capacity = (u64)data_buffer_size / item_size;
ArrayHeader *header = (ArrayHeader *)buffer;
GenericArray output = (u8 *)(header + 1);
header->magic = WAPP_ARRAY_MAGIC;
header->count = flags & ARRAY_INIT_FILLED ? item_capacity : 0;
header->capacity = item_capacity;
header->item_size = item_size;
return output;
}
wapp_persist inline void _array_validate(const GenericArray array, u64 item_size) { wapp_persist inline void _array_validate(const GenericArray array, u64 item_size) {
ArrayHeader *header = _array_header(array); ArrayHeader *header = _array_header(array);
wapp_runtime_assert(WAPP_ARRAY_MAGIC == header->magic, "`array` is not a valid wapp array"); wapp_runtime_assert(WAPP_ARRAY_MAGIC == header->magic, "`array` is not a valid wapp array");

2
src/base/array/array.h
View File

@@ -174,6 +174,8 @@ typedef enum {
#define wapp_array_calc_alloc_size(TYPE, CAPACITY) _array_calc_alloc_size(CAPACITY, sizeof(TYPE)) #define wapp_array_calc_alloc_size(TYPE, CAPACITY) _array_calc_alloc_size(CAPACITY, sizeof(TYPE))
#define wapp_array_alloc_capacity(TYPE, ALLOCATOR_PTR, CAPACITY, FLAGS) \ #define wapp_array_alloc_capacity(TYPE, ALLOCATOR_PTR, CAPACITY, FLAGS) \
((TYPE *)_array_alloc_capacity(ALLOCATOR_PTR, CAPACITY, FLAGS, sizeof(TYPE))) ((TYPE *)_array_alloc_capacity(ALLOCATOR_PTR, CAPACITY, FLAGS, sizeof(TYPE)))
#define wapp_array_from_preallcated_buffer(TYPE, BUFFER, BUFFER_SIZE) \
((TYPE *)_array_from_preallcated_buffer(BUFFER, BUFFER_SIZE, sizeof(TYPE)))
typedef struct header ArrayHeader; typedef struct header ArrayHeader;