138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
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/* $OpenBSD: tls13_buffer.c,v 1.3 2020/03/10 17:11:25 jsing Exp $ */
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/*
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* Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "ssl_locl.h"
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#include "bytestring.h"
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#include "tls13_internal.h"
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struct tls13_buffer {
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size_t capacity;
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uint8_t *data;
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size_t len;
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size_t offset;
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};
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static int tls13_buffer_resize(struct tls13_buffer *buf, size_t capacity);
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struct tls13_buffer *
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tls13_buffer_new(size_t init_size)
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{
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struct tls13_buffer *buf = NULL;
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if ((buf = calloc(1, sizeof(struct tls13_buffer))) == NULL)
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goto err;
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if (!tls13_buffer_resize(buf, init_size))
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goto err;
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return buf;
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err:
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tls13_buffer_free(buf);
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return NULL;
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}
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void
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tls13_buffer_free(struct tls13_buffer *buf)
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{
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if (buf == NULL)
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return;
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freezero(buf->data, buf->capacity);
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freezero(buf, sizeof(struct tls13_buffer));
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}
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static int
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tls13_buffer_resize(struct tls13_buffer *buf, size_t capacity)
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{
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uint8_t *data;
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if (buf->capacity == capacity)
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return 1;
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if ((data = recallocarray(buf->data, buf->capacity, capacity, 1)) == NULL)
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return 0;
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buf->data = data;
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buf->capacity = capacity;
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return 1;
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}
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int
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tls13_buffer_set_data(struct tls13_buffer *buf, CBS *data)
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{
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if (!tls13_buffer_resize(buf, CBS_len(data)))
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return 0;
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memcpy(buf->data, CBS_data(data), CBS_len(data));
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return 1;
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}
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ssize_t
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tls13_buffer_extend(struct tls13_buffer *buf, size_t len,
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tls13_read_cb read_cb, void *cb_arg)
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{
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ssize_t ret;
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if (len == buf->len)
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return buf->len;
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if (len < buf->len)
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return TLS13_IO_FAILURE;
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if (!tls13_buffer_resize(buf, len))
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return TLS13_IO_FAILURE;
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for (;;) {
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if ((ret = read_cb(&buf->data[buf->len],
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buf->capacity - buf->len, cb_arg)) <= 0)
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return ret;
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if (ret > buf->capacity - buf->len)
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return TLS13_IO_FAILURE;
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buf->len += ret;
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if (buf->len == buf->capacity)
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return buf->len;
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}
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}
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void
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tls13_buffer_cbs(struct tls13_buffer *buf, CBS *cbs)
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{
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CBS_init(cbs, buf->data, buf->len);
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}
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int
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tls13_buffer_finish(struct tls13_buffer *buf, uint8_t **out, size_t *out_len)
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{
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if (out == NULL || out_len == NULL)
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return 0;
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*out = buf->data;
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*out_len = buf->len;
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buf->capacity = 0;
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buf->data = NULL;
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buf->len = 0;
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return 1;
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}
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