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420 lines
15 KiB
C
420 lines
15 KiB
C
/** @file
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An ordered collection library interface.
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The library class provides a set of APIs to manage an ordered collection of
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items.
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Copyright (C) 2014, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __ORDERED_COLLECTION_LIB__
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#define __ORDERED_COLLECTION_LIB__
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#include <Base.h>
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//
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// Opaque structure for a collection.
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//
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typedef struct ORDERED_COLLECTION ORDERED_COLLECTION;
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//
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// Opaque structure for collection entries.
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//
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// Collection entries do not take ownership of the associated user structures,
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// they only link them. This makes it easy to link the same user structure into
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// several collections. If reference counting is required, the caller is
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// responsible for implementing it, as part of the user structure.
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//
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// A pointer-to-ORDERED_COLLECTION_ENTRY is considered an "iterator". Multiple,
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// simultaneous iterations are supported.
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//
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typedef struct ORDERED_COLLECTION_ENTRY ORDERED_COLLECTION_ENTRY;
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//
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// Altering the key field of an in-collection user structure (ie. the portion
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// of the user structure that ORDERED_COLLECTION_USER_COMPARE and
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// ORDERED_COLLECTION_KEY_COMPARE, below, read) is not allowed in-place. The
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// caller is responsible for bracketing the key change with the deletion and
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// the reinsertion of the user structure, so that the changed key value is
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// reflected in the collection.
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//
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/**
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Comparator function type for two user structures.
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@param[in] UserStruct1 Pointer to the first user structure.
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@param[in] UserStruct2 Pointer to the second user structure.
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@retval <0 If UserStruct1 compares less than UserStruct2.
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@retval 0 If UserStruct1 compares equal to UserStruct2.
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@retval >0 If UserStruct1 compares greater than UserStruct2.
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**/
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typedef
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INTN
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(EFIAPI *ORDERED_COLLECTION_USER_COMPARE)(
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IN CONST VOID *UserStruct1,
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IN CONST VOID *UserStruct2
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);
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/**
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Compare a standalone key against a user structure containing an embedded key.
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@param[in] StandaloneKey Pointer to the bare key.
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@param[in] UserStruct Pointer to the user structure with the embedded
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key.
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@retval <0 If StandaloneKey compares less than UserStruct's key.
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@retval 0 If StandaloneKey compares equal to UserStruct's key.
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@retval >0 If StandaloneKey compares greater than UserStruct's key.
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**/
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typedef
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INTN
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(EFIAPI *ORDERED_COLLECTION_KEY_COMPARE)(
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IN CONST VOID *StandaloneKey,
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IN CONST VOID *UserStruct
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);
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//
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// Some functions below are read-only, while others are read-write. If any
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// write operation is expected to run concurrently with any other operation on
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// the same collection, then the caller is responsible for implementing locking
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// for the whole collection.
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//
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/**
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Retrieve the user structure linked by the specified collection entry.
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Read-only operation.
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@param[in] Entry Pointer to the collection entry whose associated user
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structure we want to retrieve. The caller is responsible
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for passing a non-NULL argument.
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@return Pointer to user structure linked by Entry.
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**/
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VOID *
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EFIAPI
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OrderedCollectionUserStruct (
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IN CONST ORDERED_COLLECTION_ENTRY *Entry
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);
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/**
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Allocate and initialize the ORDERED_COLLECTION structure.
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@param[in] UserStructCompare This caller-provided function will be used to
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order two user structures linked into the
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collection, during the insertion procedure.
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@param[in] KeyCompare This caller-provided function will be used to
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order the standalone search key against user
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structures linked into the collection, during
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the lookup procedure.
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@retval NULL If allocation failed.
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@return Pointer to the allocated, initialized ORDERED_COLLECTION
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structure, otherwise.
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**/
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ORDERED_COLLECTION *
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EFIAPI
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OrderedCollectionInit (
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IN ORDERED_COLLECTION_USER_COMPARE UserStructCompare,
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IN ORDERED_COLLECTION_KEY_COMPARE KeyCompare
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);
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/**
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Check whether the collection is empty (has no entries).
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Read-only operation.
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@param[in] Collection The collection to check for emptiness.
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@retval TRUE The collection is empty.
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@retval FALSE The collection is not empty.
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**/
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BOOLEAN
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EFIAPI
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OrderedCollectionIsEmpty (
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IN CONST ORDERED_COLLECTION *Collection
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);
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/**
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Uninitialize and release an empty ORDERED_COLLECTION structure.
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Read-write operation.
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It is the caller's responsibility to delete all entries from the collection
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before calling this function.
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@param[in] Collection The empty collection to uninitialize and release.
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**/
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VOID
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EFIAPI
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OrderedCollectionUninit (
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IN ORDERED_COLLECTION *Collection
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);
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/**
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Look up the collection entry that links the user structure that matches the
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specified standalone key.
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Read-only operation.
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@param[in] Collection The collection to search for StandaloneKey.
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@param[in] StandaloneKey The key to locate among the user structures linked
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into Collection. StandaloneKey will be passed to
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ORDERED_COLLECTION_KEY_COMPARE.
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@retval NULL StandaloneKey could not be found.
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@return The collection entry that links to the user structure matching
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StandaloneKey, otherwise.
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**/
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ORDERED_COLLECTION_ENTRY *
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EFIAPI
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OrderedCollectionFind (
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IN CONST ORDERED_COLLECTION *Collection,
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IN CONST VOID *StandaloneKey
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);
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/**
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Find the collection entry of the minimum user structure stored in the
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collection.
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Read-only operation.
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@param[in] Collection The collection to return the minimum entry of. The
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user structure linked by the minimum entry compares
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less than all other user structures in the collection.
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@retval NULL If Collection is empty.
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@return The collection entry that links the minimum user structure,
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otherwise.
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**/
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ORDERED_COLLECTION_ENTRY *
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EFIAPI
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OrderedCollectionMin (
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IN CONST ORDERED_COLLECTION *Collection
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);
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/**
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Find the collection entry of the maximum user structure stored in the
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collection.
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Read-only operation.
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@param[in] Collection The collection to return the maximum entry of. The
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user structure linked by the maximum entry compares
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greater than all other user structures in the
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collection.
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@retval NULL If Collection is empty.
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@return The collection entry that links the maximum user structure,
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otherwise.
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**/
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ORDERED_COLLECTION_ENTRY *
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EFIAPI
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OrderedCollectionMax (
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IN CONST ORDERED_COLLECTION *Collection
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);
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/**
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Get the collection entry of the least user structure that is greater than the
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one linked by Entry.
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Read-only operation.
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@param[in] Entry The entry to get the successor entry of.
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@retval NULL If Entry is NULL, or Entry is the maximum entry of its
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containing collection (ie. Entry has no successor entry).
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@return The collection entry linking the least user structure that is
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greater than the one linked by Entry, otherwise.
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**/
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ORDERED_COLLECTION_ENTRY *
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EFIAPI
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OrderedCollectionNext (
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IN CONST ORDERED_COLLECTION_ENTRY *Entry
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);
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/**
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Get the collection entry of the greatest user structure that is less than the
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one linked by Entry.
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Read-only operation.
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@param[in] Entry The entry to get the predecessor entry of.
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@retval NULL If Entry is NULL, or Entry is the minimum entry of its
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containing collection (ie. Entry has no predecessor entry).
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@return The collection entry linking the greatest user structure that
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is less than the one linked by Entry, otherwise.
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**/
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ORDERED_COLLECTION_ENTRY *
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EFIAPI
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OrderedCollectionPrev (
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IN CONST ORDERED_COLLECTION_ENTRY *Entry
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);
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/**
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Insert (link) a user structure into the collection, allocating a new
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collection entry.
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Read-write operation.
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@param[in,out] Collection The collection to insert UserStruct into.
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@param[out] Entry The meaning of this optional, output-only
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parameter depends on the return value of the
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function.
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When insertion is successful (RETURN_SUCCESS),
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Entry is set on output to the new collection entry
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that now links UserStruct.
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When insertion fails due to lack of memory
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(RETURN_OUT_OF_RESOURCES), Entry is not changed.
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When insertion fails due to key collision (ie.
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another user structure is already in the
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collection that compares equal to UserStruct),
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with return value RETURN_ALREADY_STARTED, then
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Entry is set on output to the entry that links the
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colliding user structure. This enables
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"find-or-insert" in one function call, or helps
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with later removal of the colliding element.
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@param[in] UserStruct The user structure to link into the collection.
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UserStruct is ordered against in-collection user
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structures with the
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ORDERED_COLLECTION_USER_COMPARE function.
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@retval RETURN_SUCCESS Insertion successful. A new collection entry
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has been allocated, linking UserStruct. The
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new collection entry is reported back in
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Entry (if the caller requested it).
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Existing ORDERED_COLLECTION_ENTRY pointers
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into Collection remain valid. For example,
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on-going iterations in the caller can
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continue with OrderedCollectionNext() /
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OrderedCollectionPrev(), and they will
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return the new entry at some point if user
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structure order dictates it.
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@retval RETURN_OUT_OF_RESOURCES The function failed to allocate memory for
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the new collection entry. The collection has
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not been changed. Existing
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ORDERED_COLLECTION_ENTRY pointers into
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Collection remain valid.
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@retval RETURN_ALREADY_STARTED A user structure has been found in the
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collection that compares equal to
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UserStruct. The entry linking the colliding
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user structure is reported back in Entry (if
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the caller requested it). The collection has
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not been changed. Existing
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ORDERED_COLLECTION_ENTRY pointers into
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Collection remain valid.
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**/
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RETURN_STATUS
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EFIAPI
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OrderedCollectionInsert (
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IN OUT ORDERED_COLLECTION *Collection,
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OUT ORDERED_COLLECTION_ENTRY **Entry OPTIONAL,
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IN VOID *UserStruct
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);
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/**
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Delete an entry from the collection, unlinking the associated user structure.
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Read-write operation.
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@param[in,out] Collection The collection to delete Entry from.
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@param[in] Entry The collection entry to delete from Collection.
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The caller is responsible for ensuring that Entry
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belongs to Collection, and that Entry is non-NULL
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and valid. Entry is typically an earlier return
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value, or output parameter, of:
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- OrderedCollectionFind(), for deleting an entry
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by user structure key,
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- OrderedCollectionMin() / OrderedCollectionMax(),
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for deleting the minimum / maximum entry,
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- OrderedCollectionNext() /
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OrderedCollectionPrev(), for deleting an entry
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found during an iteration,
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- OrderedCollectionInsert() with return value
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RETURN_ALREADY_STARTED, for deleting an entry
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whose linked user structure caused collision
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during insertion.
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Existing ORDERED_COLLECTION_ENTRY pointers (ie.
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iterators) *different* from Entry remain valid.
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For example:
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- OrderedCollectionNext() /
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OrderedCollectionPrev() iterations in the caller
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can be continued from Entry, if
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OrderedCollectionNext() or
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OrderedCollectionPrev() is called on Entry
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*before* OrderedCollectionDelete() is. That is,
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fetch the successor / predecessor entry first,
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then delete Entry.
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- On-going iterations in the caller that would
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have otherwise returned Entry at some point, as
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dictated by user structure order, will correctly
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reflect the absence of Entry after
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OrderedCollectionDelete() is called
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mid-iteration.
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@param[out] UserStruct If the caller provides this optional output-only
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parameter, then on output it is set to the user
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structure originally linked by Entry (which is now
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freed).
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This is a convenience that may save the caller a
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OrderedCollectionUserStruct() invocation before
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calling OrderedCollectionDelete(), in order to
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retrieve the user structure being unlinked.
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**/
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VOID
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EFIAPI
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OrderedCollectionDelete (
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IN OUT ORDERED_COLLECTION *Collection,
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IN ORDERED_COLLECTION_ENTRY *Entry,
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OUT VOID **UserStruct OPTIONAL
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);
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#endif
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