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/*
* Copyright (C) 2002, 2004, 2005, 2007 Free Software Foundation
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
#include <gnutls_str.h>
/* These function are like strcat, strcpy. They only
* do bound checking (they shouldn't cause buffer overruns),
* and they always produce null terminated strings.
*
* They should be used only with null terminated strings.
*/
void
MHD_gtls_str_cat (char *dest, size_t dest_tot_size, const char *src)
{
size_t str_size = strlen (src);
size_t dest_size = strlen (dest);
if (dest_tot_size - dest_size > str_size)
{
strcat (dest, src);
}
else
{
if (dest_tot_size - dest_size > 0)
{
strncat (dest, src, (dest_tot_size - dest_size) - 1);
dest[dest_tot_size - 1] = 0;
}
}
}
void
MHD_gtls_str_cpy (char *dest, size_t dest_tot_size, const char *src)
{
size_t str_size = strlen (src);
if (dest_tot_size > str_size)
{
strcpy (dest, src);
}
else
{
if (dest_tot_size > 0)
{
strncpy (dest, src, (dest_tot_size) - 1);
dest[dest_tot_size - 1] = 0;
}
}
}
void
MHD_gtls_string_init (MHD_gtls_string * str,
MHD_gnutls_alloc_function alloc_func,
MHD_gnutls_realloc_function realloc_func,
MHD_gnutls_free_function free_func)
{
str->data = NULL;
str->max_length = 0;
str->length = 0;
str->alloc_func = alloc_func;
str->free_func = free_func;
str->realloc_func = realloc_func;
}
void
MHD_gtls_string_clear (MHD_gtls_string * str)
{
if (str == NULL || str->data == NULL)
return;
str->free_func (str->data);
str->data = NULL;
str->max_length = 0;
str->length = 0;
}
#define MIN_CHUNK 256
int
MHD_gtls_string_append_data (MHD_gtls_string * dest,
const void *data, size_t data_size)
{
size_t tot_len = data_size + dest->length;
if (dest->max_length >= tot_len)
{
memcpy (&dest->data[dest->length], data, data_size);
dest->length = tot_len;
return tot_len;
}
else
{
size_t new_len =
MAX (data_size, MIN_CHUNK) + MAX (dest->max_length, MIN_CHUNK);
dest->data = dest->realloc_func (dest->data, new_len);
if (dest->data == NULL)
{
MHD_gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
dest->max_length = new_len;
memcpy (&dest->data[dest->length], data, data_size);
dest->length = tot_len;
return tot_len;
}
}
/* Converts the given string (old) to hex. A buffer must be provided
* to hold the new hex string. The new string will be null terminated.
* If the buffer does not have enough space to hold the string, a
* truncated hex string is returned (always null terminated).
*/
char *
MHD_gtls_bin2hex (const void *_old,
size_t oldlen, char *buffer, size_t buffer_size)
{
unsigned int i, j;
const opaque *old = _old;
for (i = j = 0; i < oldlen && j + 2 < buffer_size; j += 2)
{
sprintf (&buffer[j], "%.2x", old[i]);
i++;
}
buffer[j] = '\0';
return buffer;
}
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