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/* $OpenBSD: tls13_buffer.c,v 1.5 2021/05/16 14:19:04 jsing Exp $ */
/*
* Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bytestring.h"
#include "tls13_internal.h"
struct tls13_buffer {
size_t capacity;
uint8_t *data;
size_t len;
size_t offset;
};
static int tls13_buffer_resize(struct tls13_buffer *buf, size_t capacity);
struct tls13_buffer *
tls13_buffer_new(size_t init_size)
{
struct tls13_buffer *buf = NULL;
if ((buf = calloc(1, sizeof(struct tls13_buffer))) == NULL)
goto err;
if (!tls13_buffer_resize(buf, init_size))
goto err;
return buf;
err:
tls13_buffer_free(buf);
return NULL;
}
void
tls13_buffer_free(struct tls13_buffer *buf)
{
if (buf == NULL)
return;
freezero(buf->data, buf->capacity);
freezero(buf, sizeof(struct tls13_buffer));
}
static int
tls13_buffer_resize(struct tls13_buffer *buf, size_t capacity)
{
uint8_t *data;
if (buf->capacity == capacity)
return 1;
if ((data = recallocarray(buf->data, buf->capacity, capacity, 1)) == NULL)
return 0;
buf->data = data;
buf->capacity = capacity;
return 1;
}
int
tls13_buffer_set_data(struct tls13_buffer *buf, CBS *data)
{
if (!tls13_buffer_resize(buf, CBS_len(data)))
return 0;
memcpy(buf->data, CBS_data(data), CBS_len(data));
return 1;
}
ssize_t
tls13_buffer_extend(struct tls13_buffer *buf, size_t len,
tls13_read_cb read_cb, void *cb_arg)
{
ssize_t ret;
if (len == buf->len)
return buf->len;
if (len < buf->len)
return TLS13_IO_FAILURE;
if (!tls13_buffer_resize(buf, len))
return TLS13_IO_FAILURE;
for (;;) {
if ((ret = read_cb(&buf->data[buf->len],
buf->capacity - buf->len, cb_arg)) <= 0)
return ret;
if (ret > buf->capacity - buf->len)
return TLS13_IO_FAILURE;
buf->len += ret;
if (buf->len == buf->capacity)
return buf->len;
}
}
void
tls13_buffer_cbs(struct tls13_buffer *buf, CBS *cbs)
{
CBS_init(cbs, buf->data, buf->len);
}
int
tls13_buffer_finish(struct tls13_buffer *buf, uint8_t **out, size_t *out_len)
{
if (out == NULL || out_len == NULL)
return 0;
*out = buf->data;
*out_len = buf->len;
buf->capacity = 0;
buf->data = NULL;
buf->len = 0;
return 1;
}
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