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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* buffer.c - Generic data buffer, used by openssh, gnome-keyring
Copyright (C) 2007, 2012 Stefan Walter
Copyright (C) 2013 Red Hat Inc.
The Gnome Keyring Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Gnome Keyring 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the Gnome 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.
Author: Stef Walter <stef@thewalter.net>
*/
#include "config.h"
#include "buffer.h"
#include "debug.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
static bool
buffer_realloc (p11_buffer *buffer,
size_t size)
{
void *data;
/* Memory owned elsewhere can't be reallocated */
return_val_if_fail (buffer->frealloc != NULL, false);
/* Reallocate built in buffer using allocator */
data = (buffer->frealloc) (buffer->data, size);
if (!data && size > 0) {
p11_buffer_fail (buffer);
return_val_if_reached (false);
}
buffer->data = data;
buffer->size = size;
return true;
}
bool
p11_buffer_init (p11_buffer *buffer,
size_t reserve)
{
p11_buffer_init_full (buffer, NULL, 0, 0, realloc, free);
return buffer_realloc (buffer, reserve);
}
bool
p11_buffer_init_null (p11_buffer *buffer,
size_t reserve)
{
p11_buffer_init_full (buffer, NULL, 0, P11_BUFFER_NULL, realloc, free);
return buffer_realloc (buffer, reserve);
}
void
p11_buffer_init_full (p11_buffer *buffer,
void *data,
size_t len,
int flags,
void * (* frealloc) (void *, size_t),
void (* ffree) (void *))
{
memset (buffer, 0, sizeof (*buffer));
buffer->data = data;
buffer->len = len;
buffer->size = len;
buffer->flags = flags;
buffer->frealloc = frealloc;
buffer->ffree = ffree;
return_if_fail (!(flags & P11_BUFFER_FAILED));
}
void
p11_buffer_uninit (p11_buffer *buffer)
{
return_if_fail (buffer != NULL);
if (buffer->ffree && buffer->data)
(buffer->ffree) (buffer->data);
memset (buffer, 0, sizeof (*buffer));
}
void *
p11_buffer_steal (p11_buffer *buffer,
size_t *length)
{
void *data;
return_val_if_fail (p11_buffer_ok (buffer), NULL);
if (length)
*length = buffer->len;
data = buffer->data;
buffer->data = NULL;
buffer->size = 0;
buffer->len = 0;
return data;
}
bool
p11_buffer_reset (p11_buffer *buffer,
size_t reserve)
{
buffer->flags &= ~P11_BUFFER_FAILED;
buffer->len = 0;
if (reserve < buffer->size)
return true;
return buffer_realloc (buffer, reserve);
}
void *
p11_buffer_append (p11_buffer *buffer,
size_t length)
{
unsigned char *data;
size_t terminator;
size_t newlen;
size_t reserve;
return_val_if_fail (p11_buffer_ok (buffer), NULL);
terminator = (buffer->flags & P11_BUFFER_NULL) ? 1 : 0;
reserve = terminator + length + buffer->len;
if (reserve > buffer->size) {
/* Calculate a new length, minimize number of buffer allocations */
newlen = buffer->size * 2;
if (!newlen)
newlen = 16;
if (reserve > newlen)
newlen = reserve;
if (!buffer_realloc (buffer, newlen))
return_val_if_reached (NULL);
}
data = buffer->data;
data += buffer->len;
buffer->len += length;
if (terminator)
data[length] = '\0';
return data;
}
void
p11_buffer_add (p11_buffer *buffer,
const void *data,
ssize_t length)
{
void *at;
if (length < 0)
length = strlen (data);
at = p11_buffer_append (buffer, length);
return_if_fail (at != NULL);
memcpy (at, data, length);
}
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