// SPDX-License-Identifier: ISC#include <stdbool.h>#include <stddef.h>#include <stdint.h>#include <stdlib.h>#include <string.h> #include "http_response_buffer.h"#include "banned.h" enum http_response_buffer_resulthttp_response_buffer_write(struct http_response_buffer *buf,    const void *contents, size_t size, size_t nmemb, bool retain,    size_t *written){	char *data;	size_t new_len;	size_t new_received;	size_t realsize; 	*written = 0;	if (size != 0 && nmemb > SIZE_MAX / size)		return HTTP_RESPONSE_BUFFER_OVERFLOW;	realsize = size * nmemb; 	if (realsize > SIZE_MAX - buf->received)		return HTTP_RESPONSE_BUFFER_OVERFLOW;	new_received = buf->received + realsize;	if (new_received > buf->limit)		return HTTP_RESPONSE_BUFFER_TOO_LARGE; 	if (!retain) {		buf->received = new_received;		*written = realsize;		return HTTP_RESPONSE_BUFFER_OK;	} 	if (realsize > SIZE_MAX - buf->len)		return HTTP_RESPONSE_BUFFER_OVERFLOW;	new_len = buf->len + realsize;	if (new_len == SIZE_MAX)		return HTTP_RESPONSE_BUFFER_OVERFLOW; 	data = realloc(buf->data, new_len + 1);	if (data == NULL)		return HTTP_RESPONSE_BUFFER_NO_MEMORY;	memcpy(data + buf->len, contents, realsize);	data[new_len] = '\0';	buf->data = data;	buf->len = new_len;	buf->received = new_received;	*written = realsize;	return HTTP_RESPONSE_BUFFER_OK;}