/* 
 *  Unix SMB/CIFS implementation.
 *  UUID server routines
 *  Copyright (C) Theodore Ts'o               1996, 1997,
 *  Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002, 2003
 *
 *  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 "includes.h"

/*
 * Offset between 15-Oct-1582 and 1-Jan-70
 */
#define TIME_OFFSET_HIGH 0x01B21DD2
#define TIME_OFFSET_LOW  0x13814000

void smb_uuid_pack(const struct GUID uu, UUID_FLAT *ptr)
{
	SIVAL(ptr->info, 0, uu.time_low);
	SSVAL(ptr->info, 4, uu.time_mid);
	SSVAL(ptr->info, 6, uu.time_hi_and_version);
	memcpy(ptr->info+8, uu.clock_seq, 2);
	memcpy(ptr->info+10, uu.node, 6);
}

void smb_uuid_unpack(const UUID_FLAT in, struct GUID *uu)
{
	uu->time_low = IVAL(in.info, 0);
	uu->time_mid = SVAL(in.info, 4);
	uu->time_hi_and_version = SVAL(in.info, 6);
	memcpy(uu->clock_seq, in.info+8, 2);
	memcpy(uu->node, in.info+10, 6);
}

void smb_uuid_generate_random(struct GUID *uu)
{
	UUID_FLAT tmp;

	generate_random_buffer(tmp.info, sizeof(tmp.info));
	smb_uuid_unpack(tmp, uu);

	uu->clock_seq[0] = (uu->clock_seq[0] & 0x3F) | 0x80;
	uu->time_hi_and_version = (uu->time_hi_and_version & 0x0FFF) | 0x4000;
}

const char *smb_uuid_string(TALLOC_CTX *mem_ctx, const struct GUID uu)
{
	char *result;

	result = talloc_asprintf(
		mem_ctx,
		"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
		uu.time_low, uu.time_mid, uu.time_hi_and_version,
		uu.clock_seq[0], uu.clock_seq[1],
		uu.node[0], uu.node[1], uu.node[2], 
		uu.node[3], uu.node[4], uu.node[5]);

	SMB_ASSERT(result != NULL);
	return result;
}

bool smb_string_to_uuid(const char *in, struct GUID* uu)
{
	bool ret = False;
	const char *ptr = in;
	char *end = (char *)in;
	int i;
	unsigned v1, v2;

	if (!in || !uu) goto out;

	uu->time_low = strtoul(ptr, &end, 16);
	if ((end - ptr) != 8 || *end != '-') goto out;
	ptr = (end + 1);

	uu->time_mid = strtoul(ptr, &end, 16);
	if ((end - ptr) != 4 || *end != '-') goto out;
	ptr = (end + 1);

	uu->time_hi_and_version = strtoul(ptr, &end, 16);
	if ((end - ptr) != 4 || *end != '-') goto out;
	ptr = (end + 1);

	if (sscanf(ptr, "%02x%02x", &v1, &v2) != 2) {
		goto out;
	}
	uu->clock_seq[0] = v1;
	uu->clock_seq[1] = v2;
	ptr += 4;

	if (*ptr != '-') goto out;
	ptr++;

	for (i = 0; i < 6; i++) {
		if (sscanf(ptr, "%02x", &v1) != 1) {
			goto out;
		}
		uu->node[i] = v1;
		ptr += 2;
	}

	ret = True;
out:
        return ret;
}

/*****************************************************************
 Return the binary string representation of a GUID.
 Caller must free.
*****************************************************************/

char *guid_binstring(const struct GUID *guid)
{
	UUID_FLAT guid_flat;

	smb_uuid_pack(*guid, &guid_flat);

	return binary_string_rfc2254((char *)guid_flat.info, UUID_FLAT_SIZE);
}