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/*
Unix SMB/CIFS implementation.
Easy management of byte-length data
Copyright (C) Andrew Tridgell 2001
Copyright (C) Andrew Bartlett 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*******************************************************************
construct a data blob, must be freed with data_blob_free()
you can pass NULL for p and get a blank data blob
*******************************************************************/
DATA_BLOB data_blob(const void *p, size_t length)
{
DATA_BLOB ret;
if (length == 0) {
ZERO_STRUCT(ret);
return ret;
}
if (p) {
ret.data = talloc_memdup(NULL, p, length);
} else {
ret.data = talloc(NULL, length);
}
if (ret.data == NULL) {
ret.length = 0;
return ret;
}
ret.length = length;
return ret;
}
/*******************************************************************
construct a data blob, using supplied TALLOC_CTX
*******************************************************************/
DATA_BLOB data_blob_talloc(TALLOC_CTX *mem_ctx, const void *p, size_t length)
{
DATA_BLOB ret = data_blob(p, length);
if (ret.data) {
ret.data = talloc_steal(mem_ctx, ret.data);
} else {
/* this ensures the blob has the context attached, so a zero length call
to data_blob_talloc followed by a realloc doesn't cause the memory to come
from the NULL context */
ret.data = talloc(mem_ctx, 0);
}
return ret;
}
/*******************************************************************
construct a zero data blob, using supplied TALLOC_CTX.
use this sparingly as it initialises data - better to initialise
yourself if you want specific data in the blob
*******************************************************************/
DATA_BLOB data_blob_talloc_zero(TALLOC_CTX *mem_ctx, size_t length)
{
DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, length);
data_blob_clear(&blob);
return blob;
}
/*******************************************************************
free a data blob
*******************************************************************/
void data_blob_free(DATA_BLOB *d)
{
if (d) {
talloc_free(d->data);
d->data = NULL;
d->length = 0;
}
}
/*******************************************************************
clear a DATA_BLOB's contents
*******************************************************************/
void data_blob_clear(DATA_BLOB *d)
{
if (d->data) {
memset(d->data, 0, d->length);
}
}
/*******************************************************************
free a data blob and clear its contents
*******************************************************************/
void data_blob_clear_free(DATA_BLOB *d)
{
data_blob_clear(d);
data_blob_free(d);
}
/*******************************************************************
check if two data blobs are equal
*******************************************************************/
BOOL data_blob_equal(const DATA_BLOB *d1, const DATA_BLOB *d2)
{
if (d1->length != d2->length) {
return False;
}
if (d1->data == d2->data) {
return True;
}
if (d1->data == NULL || d2->data == NULL) {
return False;
}
if (memcmp(d1->data, d2->data, d1->length) == 0) {
return True;
}
return False;
}
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