/* 

   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 3 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, see <http://www.gnu.org/licenses/>.

*/

#include <string.h>

#include "data_blob.h"

#ifndef ZERO_STRUCT

#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))

#endif

const DATA_BLOB data_blob_null = { NULL, 0 };

/**

 * @file

 * @brief Manipulation of arbitrary data blobs

 **/

/**

 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_named(const void *p, size_t length, const char *name)

{

	DATA_BLOB ret;

	if (p == NULL && length == 0) {

		ZERO_STRUCT(ret);

		return ret;

	}

	if (p) {

		ret.data = (uint8_t *)talloc_memdup(NULL, p, length);

	} else {

		ret.data = talloc_array(NULL, uint8_t, length);

	}

	if (ret.data == NULL) {

		ret.length = 0;

		return ret;

	}

	talloc_set_name_const(ret.data, name);

	ret.length = length;

	return ret;

}

/**

 construct a data blob, using supplied TALLOC_CTX

**/

DATA_BLOB data_blob_talloc_named(TALLOC_CTX *mem_ctx, const void *p, size_t length, const char *name)

{

	DATA_BLOB ret = data_blob_named(p, length, name);

	if (ret.data) {

		talloc_steal(mem_ctx, ret.data);

	}

	return ret;

}

/**

free a data blob

**/

void data_blob_free(DATA_BLOB *d)

{

	if (d) {

		talloc_free(d->data);

		d->data = NULL;

		d->length = 0;

	}

}