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@ -7,13 +7,13 @@
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*/ |
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/**
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* @defgroup sys_uuid (Locally) Unique ID Generator |
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* @defgroup sys_luid Locally Unique ID Generator |
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* @ingroup sys |
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* @brief Generate system wide unique IDs |
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* @brief Generate system wide (locally) unique IDs |
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* |
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* This module generates system wide, variable length unique IDs based on on the |
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* cpuid module. If the cpuid module is not present, the module falls back to a |
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* pre-defined, constant seed for creating unique ids. |
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* pre-defined, constant seed for creating unique IDs. |
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* |
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* The main purpose of this module is to have a unified way for e.g. creating |
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* hardware addresses and similar. |
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@ -24,24 +24,24 @@
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* base ID is created by simple 'memsetting' the base ID with the defined |
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* backup seed value. |
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* |
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* Once the base ID is generated, a UUID is generated by (i) XORing a counter |
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* Once the base ID is generated, a LUID is generated by (i) XORing a counter |
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* value with the LSB of the base ID, or (ii) by XORing the least significant |
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* byes with a value given by the user. |
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* |
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* Example: Calling `uuid_base(&buf, 8)` will always yield an identical value, |
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* Example: Calling `luid_base(&buf, 8)` will always yield an identical value, |
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* independent how often the function is called. But calling |
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* `uuid_base(&buf, 2)` afterwards will results in a different value, if the |
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* `luid_base(&buf, 2)` afterwards will results in a different value, if the |
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* cpuid module is present, and in the same (but shorter) value if not. |
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* |
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* Example: Calling `uuid_get(&buf, 8)` four times in a row, will yield four |
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* Example: Calling `luid_get(&buf, 8)` four times in a row, will yield four |
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* different IDs, differing in their LSB. |
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* |
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* Example: Calling `uuid_custom(&buf, 8, 123)` will always yield the same |
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* value, but calling `uuid_custom(&buf, 8, 124)` will differ. |
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* Example: Calling `luid_custom(&buf, 8, 123)` will always yield the same |
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* value, but calling `luid_custom(&buf, 8, 124)` will differ. |
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* |
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* @note This module generates unique IDs without any guarantees on their |
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* structure. These UUIDs are not compatible nor conform to the |
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* UUIDs as defined in RFC4122. |
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* @note This module generates locally unique IDs without any guarantees |
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* on their structure. These LUIDs are not compatible nor conform |
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* to UUIDs as defined in RFC4122. |
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* |
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* @{ |
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* @file |
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@ -50,8 +50,8 @@
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de> |
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*/ |
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#ifndef UUID_H_ |
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#define UUID_H_ |
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#ifndef LUID_H_ |
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#define LUID_H_ |
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#include <stddef.h> |
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@ -60,27 +60,27 @@ extern "C" {
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#endif |
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/**
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* @brief Value used as based for the UUIDs in case the cpuid module is not |
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* @brief Value used as based for the LUIDs in case the cpuid module is not |
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* present |
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*/ |
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#ifndef UUID_BACKUP_SEED |
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#define UUID_BACKUP_SEED 0x23 |
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#ifndef LUID_BACKUP_SEED |
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#define LUID_BACKUP_SEED 0x23 |
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#endif |
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/**
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* @brief Get a unique ID |
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* |
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* The resulting ID is built from the base ID generated with uuid_base(), which |
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* The resulting ID is built from the base ID generated with luid_base(), which |
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* isXORed with an 8-bit incrementing counter value into the most significant |
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* byte. |
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* |
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* @note The resulting UUID will repeat after 255 calls. |
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* @note The resulting LUID will repeat after 255 calls. |
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* |
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* @param[out] buf memory location to copy the UUID into. MUST be able to |
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* @param[out] buf memory location to copy the LUID into. MUST be able to |
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* hold at least @p len bytes |
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* @param[in] len length of the UUID in bytes |
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* @param[in] len length of the LUID in bytes |
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*/ |
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void uuid_get(void *buf, size_t len); |
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void luid_get(void *buf, size_t len); |
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/**
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* @brief Get a custom unique ID based on a user given generator value |
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@ -89,31 +89,31 @@ void uuid_get(void *buf, size_t len);
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* ID's most significant bytes. |
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* |
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* @note Calling this function with identical values for @p gen and @p len |
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* will always result in identical UUIDs. |
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* will always result in identical LUIDs. |
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* |
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* @param[out] buf memory location to copy the UUID into. MUST be able to |
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* @param[out] buf memory location to copy the LUID into. MUST be able to |
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* hold at least @p len bytes |
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* @param[in] len length of the UUID in bytes |
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* @param[in] gen custom UUID generator value |
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* @param[in] len length of the LUID in bytes |
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* @param[in] gen custom LUID generator value |
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*/ |
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void uuid_custom(void *buf, size_t len, int gen); |
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void luid_custom(void *buf, size_t len, int gen); |
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/**
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* @brief Get a UUID base value |
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* @brief Get a LUID base value |
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* |
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* The uuid module creates the value dependent on the given @p len value using |
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* the cpuid module if present or a static seed value (@ref UUID_BACKUP_SEED) if |
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* The luid module creates the value dependent on the given @p len value using |
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* the cpuid module if present or a static seed value (@ref LUID_BACKUP_SEED) if |
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* not. |
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* |
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* @param[out] buf memory location to copy the UUID into. MUST be able to |
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* @param[out] buf memory location to copy the LUID into. MUST be able to |
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* hold at least @p len bytes |
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* @param[in] len length of the UUID in bytes |
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* @param[in] len length of the LUID in bytes |
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*/ |
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void uuid_base(void *buf, size_t len); |
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void luid_base(void *buf, size_t len); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* UUID_H_ */ |
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#endif /* LUID_H_ */ |
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/** @} */ |
Hauke Petersen
6 years ago