mirror of https://github.com/neutrinolabs/xrdp
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2021
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/**
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* @file common/guid.h
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* @brief GUID manipulation declarations
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*/
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#ifndef GUID_H
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#define GUID_H
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#include "arch.h"
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#define GUID_SIZE 16 /* bytes */
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#define GUID_STR_SIZE (GUID_SIZE * 2 + 4 + 1) /* w/ 4 hyphens + null terminator */
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/**
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* Use a struct for the guid so we can easily copy by assignment.
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* We use an array of char so that
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* we can compare GUIDs with a straight memcmp()
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*
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* Some fields of the GUID are in little-endian-order as specified by
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* [MS-DTYP]. This is at odds with RFC4122 which specifies big-endian
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* order for all fields.
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*
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* Octets RFC4122 field
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* ------ -------------
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* 0-3 time_low (little-endian)
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* 4-5 time_mid (little-endian)
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* 6-7 time_hi_and_version (little-endian)
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* 8 clock_seq_hi_and_reserved
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* 9 clock_seq_low (in order)
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* 10-15 node
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*/
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struct guid
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{
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char g[GUID_SIZE];
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};
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/**
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* Get an initialised GUID
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*
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* The GUID is compatible with RFC4122 section 4.4.
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*
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* @return new GUID
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*/
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struct guid guid_new(void);
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/**
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* Clears an initialised GUID, so guid_is_set() returns true
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*
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* @param guid GUID to clear
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*/
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void
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guid_clear(struct guid *guid);
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/**
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* Checks if a GUID is initialised
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*
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* @param guid GUID to check (can be NULL)
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* @return non-zero if GUID is set
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*/
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int
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guid_is_set(const struct guid *guid);
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/**
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* Converts a GUID to a string representation
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*
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* @param guid GUID to represent
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* @param dest destionation pointer to at least GUID_STR_SIZE
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* bytes to store the representation
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* @return dest is returned for convenience
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*/
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const char *guid_to_str(const struct guid *guid, char *dest);
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#endif
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