113 lines
4 KiB
Text
113 lines
4 KiB
Text
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=pod
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=head1 NAME
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DEFINE_SPARSE_ARRAY_OF, ossl_sa_TYPE_new, ossl_sa_TYPE_free,
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ossl_sa_TYPE_free_leaves, ossl_sa_TYPE_num, ossl_sa_TYPE_doall,
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ossl_sa_TYPE_doall_arg, ossl_sa_TYPE_get, ossl_sa_TYPE_set
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- sparse array container
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=head1 SYNOPSIS
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#include "internal/sparse_array.h"
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typedef struct sparse_array_st OPENSSL_SA;
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SPARSE_ARRAY_OF(TYPE)
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DEFINE_SPARSE_ARRAY_OF(TYPE)
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SPARSE_ARRAY_OF(TYPE) *ossl_sa_TYPE_new(void);
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void ossl_sa_TYPE_free(const SPARSE_ARRAY_OF(TYPE) *sa);
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void ossl_sa_TYPE_free_leaves(const SPARSE_ARRAY_OF(TYPE) *sa);
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int ossl_sa_TYPE_num(const SPARSE_ARRAY_OF(TYPE) *sa);
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void ossl_sa_TYPE_doall(const OPENSSL_SA *sa, void (*leaf)(void *));
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void ossl_sa_TYPE_doall_arg(const OPENSSL_SA *sa, void (*leaf)(void *), void *arg);
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TYPE *ossl_sa_TYPE_get(const SPARSE_ARRAY_OF(TYPE) *sa, size_t idx);
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int ossl_sa_TYPE_set(SPARSE_ARRAY_OF(TYPE) *sa, size_t idx, TYPE *value);
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=head1 DESCRIPTION
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SPARSE_ARRAY_OF() returns the name for a sparse array of the specified
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B<TYPE>. DEFINE_STACK_OF() creates set of functions for a sparse array of
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B<TYPE>. This will mean that a pointer to type B<TYPE> is stored in each
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element of a sparse array, the type is referenced by SPARSE_ARRAY_OF(TYPE) and
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each function name begins with I<ossl_sa_TYPE_>. For example:
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TYPE *ossl_sa_TYPE_get(SPARSE_ARRAY_OF(TYPE) *sa, size_t idx);
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ossl_sa_TYPE_num() returns the number of elements in B<sa> or 0 if B<sa> is
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B<NULL>.
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ossl_sa_TYPE_get() returns element B<idx> in B<sa>, where B<idx> starts at
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zero. If B<idx> refers to a value that has not been set then B<NULL> is
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returned.
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ossl_sa_TYPE_set() sets element B<idx> in B<sa> to B<value>, where B<idx>
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starts at zero. The sparse array will be resized as required.
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ossl_sa_TYPE_new() allocates a new empty sparse array.
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ossl_sa_TYPE_free() frees up the B<sa> structure. It does B<not> free up any
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elements of B<sa>. After this call B<sa> is no longer valid.
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ossl_sa_TYPE_free_leaves() frees up the B<sa> structure and all of its
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elements. After this call B<sa> is no longer valid.
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ossl_sa_TYPE_doall() calls the function B<leaf> for each element in B<sa> in
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ascending index order.
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ossl_sa_TYPE_doall_arg() calls the function B<leaf> for each element in B<sa>
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in ascending index order. The argument B<arg> is passed to each call of
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B<leaf>.
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=head1 NOTES
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Sparse arrays are an internal data structure and should B<not> be used by user
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applications.
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Care should be taken when accessing sparse arrays in multi-threaded
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environments. The ossl_sa_TYPE_set operation can cause the internal structure
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of the sparse array to change which causes race conditions if the sparse array
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is accessed in a different thread.
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SPARSE_ARRAY_OF() and DEFINE_SPARSE_ARRAY_OF() are implemented as macros.
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The underlying utility B<OPENSSL_SA_> API should not be used directly. It
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defines these functions: OPENSSL_SA_doall, OPENSSL_SA_doall_arg,
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OPENSSL_SA_free, OPENSSL_SA_free_leaves, OPENSSL_SA_get, OPENSSL_SA_new,
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OPENSSL_SA_num and OPENSSL_SA_set.
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=head1 RETURN VALUES
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ossl_sa_TYPE_num() returns the number of elements in the sparse array or B<0>
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if the passed sparse array is B<NULL>.
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ossl_sa_TYPE_get() returns a pointer to a sparse array element or B<NULL> if
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the element has not be set.
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ossl_sa_TYPE_set() return B<1> on success and B<0> on error. In the latter
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case, the elements of the sparse array remain unchanged, although the internal
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structures might have.
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ossl_sa_TYPE_new() returns an empty sparse array or B<NULL> if an error
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occurs.
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ossl_sa_TYPE_doall, ossl_sa_TYPE_doall_arg, ossl_sa_TYPE_free() and
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ossl_sa_TYPE_free_leaves() do not return values.
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=head1 HISTORY
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This functionality was added to OpenSSL 3.0.0.
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=head1 COPYRIGHT
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Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. Copyright
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(c) 2019, Oracle and/or its affiliates. All rights reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use this
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file except in compliance with the License. You can obtain a copy in the file
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LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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