#include <stdlib.h>
#include <memory.h>

#include "bin.h"

#define W2_ENDIAN_LITTLE (1)
#define W2_ENDIAN_BIG (0)

#define _SHIFT_0B (8 * 0)
#define _SHIFT_1B (8 * 1)
#define _SHIFT_2B (8 * 2)
#define _SHIFT_3B (8 * 3)
#define _BYTE_0 ((uint32_t)(0xff << (_SHIFT_0B)))
#define _BYTE_1 ((uint32_t)(0xff << (_SHIFT_1B)))
#define _BYTE_2 ((uint32_t)(0xff << (_SHIFT_2B)))
#define _BYTE_3 ((uint32_t)(0xff << (_SHIFT_3B)))

const uint8_t W2_STRUCT_T_SIZES[] = {sizeof(uint8_t), sizeof(uint16_t), sizeof(uint32_t)};

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshift-count-overflow"
w2_s_bin *w2_bin_from_uint8_t(uint8_t data) {
	size_t size	  = 1;
	w2_s_bin *ret = malloc(sizeof(w2_s_bin) + sizeof(uint8_t) * size);
	ret->bytes	  = size;
	ret->data[0]  = data;
	return ret;
}

w2_s_bin *w2_bin_from_uint16_t(uint16_t data) {
	size_t size	  = 2;
	w2_s_bin *ret = malloc(sizeof(w2_s_bin) + sizeof(uint8_t) * size);
	data		  = w2_bin_hton16(data);
	ret->bytes	  = size;
	ret->data[0]  = (data & _BYTE_1) >> _SHIFT_1B;
	ret->data[1]  = (data & _BYTE_0) >> _SHIFT_0B;
	return ret;
}

w2_s_bin *w2_bin_from_uint32_t(uint32_t data) {
	size_t size	  = 4;
	w2_s_bin *ret = malloc(sizeof(w2_s_bin) + sizeof(uint8_t) * size);
	data		  = w2_bin_hton32(data);
	ret->bytes	  = size;
	ret->data[0]  = (data & _BYTE_3) >> _SHIFT_3B;
	ret->data[1]  = (data & _BYTE_2) >> _SHIFT_2B;
	ret->data[2]  = (data & _BYTE_1) >> _SHIFT_1B;
	ret->data[3]  = (data & _BYTE_0) >> _SHIFT_0B;
	return ret;
}

uint32_t w2_bin_hton32(uint32_t h32) {
	if (g_w2_endianness == W2_ENDIAN_BIG) return h32;
	return ((h32 & _BYTE_0) << _SHIFT_3B) | ((h32 & _BYTE_1) << _SHIFT_1B) |
		   ((h32 & _BYTE_2) >> _SHIFT_1B) | ((h32 & _BYTE_3) >> _SHIFT_3B);
}
#pragma GCC diagnostic pop

uint16_t w2_bin_hton16(uint16_t h16) {
	if (g_w2_endianness == W2_ENDIAN_BIG) return h16;
	return ((h16 & _BYTE_0) << _SHIFT_1B) | ((h16 & _BYTE_1) >> _SHIFT_1B);
}

uint32_t w2_bin_ntoh32(uint32_t n32) { return w2_bin_hton32(n32); }
uint16_t w2_bin_ntoh16(uint16_t n16) { return w2_bin_hton16(n16); }

w2_s_bin *w2_bin_s_alloc(uint16_t bytes, uint8_t *data) {
	w2_s_bin* temp = malloc(sizeof(w2_s_bin) + sizeof(uint8_t) * bytes);
	temp->bytes = bytes;
	memcpy(&temp->data, data, bytes);
	return temp;
}