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/* buffer.c
*
* A bare-bones string stream.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "buffer.h"
int
nettle_buffer_grow(struct nettle_buffer *buffer,
unsigned length)
{
assert(buffer->size <= buffer->alloc);
if (buffer->size + length > buffer->alloc)
{
unsigned alloc;
uint8_t *p;
if (!buffer->realloc)
return 0;
alloc = buffer->alloc * 2 + length + 100;
p = buffer->realloc(buffer->realloc_ctx, buffer->contents, alloc);
if (!p)
return 0;
buffer->contents = p;
buffer->alloc = alloc;
}
return 1;
}
void
nettle_buffer_init_realloc(struct nettle_buffer *buffer,
void *realloc_ctx,
nettle_realloc_func *realloc)
{
buffer->contents = NULL;
buffer->alloc = 0;
buffer->realloc = realloc;
buffer->realloc_ctx = realloc_ctx;
buffer->size = 0;
}
void
nettle_buffer_init_size(struct nettle_buffer *buffer,
unsigned length, uint8_t *space)
{
buffer->contents = space;
buffer->alloc = length;
buffer->realloc = NULL;
buffer->realloc_ctx = NULL;
buffer->size = 0;
}
void
nettle_buffer_clear(struct nettle_buffer *buffer)
{
if (buffer->realloc)
buffer->realloc(buffer->realloc_ctx, buffer->contents, 0);
buffer->contents = NULL;
buffer->alloc = 0;
buffer->size = 0;
}
void
nettle_buffer_reset(struct nettle_buffer *buffer)
{
buffer->size = 0;
}
uint8_t *
nettle_buffer_space(struct nettle_buffer *buffer,
unsigned length)
{
uint8_t *p;
if (!nettle_buffer_grow(buffer, length))
return NULL;
p = buffer->contents + buffer->size;
buffer->size += length;
return p;
}
int
nettle_buffer_write(struct nettle_buffer *buffer,
unsigned length, const uint8_t *data)
{
uint8_t *p = nettle_buffer_space(buffer, length);
if (p)
{
memcpy(p, data, length);
return 1;
}
else
return 0;
}
int
nettle_buffer_copy(struct nettle_buffer *dst,
const struct nettle_buffer *src)
{
return nettle_buffer_write(dst, src->size, src->contents);
}
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