vector.c

#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "vector.h"

int vector_create(struct vector *const vec, int capacity)
{
	vec->size = 0;
	vec->capacity = capacity;
	vec->data = malloc(capacity * sizeof(char));
	return vec->data == NULL ? -1 : 0;
}

int vector_destroy(struct vector *vec)
{
	if (vec == NULL || vec->data == NULL)
		return -1;

	vec->size = 0;
	vec->capacity = 0;
	free(vec->data);
	vec->data = NULL;
	vec = NULL;
	return 0;
}

int vector_push(struct vector *const vec, char *bytes, int len)
{
	if (vec->size + len > vec->capacity) {
		vec->capacity *= 2;
		vec->data = realloc(vec->data, vec->capacity * sizeof(char));
		if (vec->data == NULL)
			return -1;
	}
	memcpy(vec->data + vec->size, bytes, len);
	vec->size += len;
	return 0;
}

int vector_write32LE(struct vector * const vec, int offset, int32_t value)
{
	if (offset >= vec->size)
		return -1;
	// offset opposite of usual since we explicitly want LE
	vec->data[offset + 3] = (value & 0xFF000000) >> 24;
	vec->data[offset + 2] = (value & 0x00FF0000) >> 16;
	vec->data[offset + 1] = (value & 0x0000FF00) >> 8;
	vec->data[offset + 0] = (value & 0x000000FF);
	return 0;
}