65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/* apk_atom.c - Alpine Package Keeper (APK)
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*
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* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
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* Copyright (C) 2008-2020 Timo Teräs <timo.teras@iki.fi>
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#include "apk_atom.h"
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apk_blob_t apk_atom_null = APK_BLOB_NULL;
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struct apk_atom_hashnode {
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struct hlist_node hash_node;
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apk_blob_t blob;
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};
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static apk_blob_t atom_hash_get_key(apk_hash_item item)
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{
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return ((struct apk_atom_hashnode *) item)->blob;
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}
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static struct apk_hash_ops atom_ops = {
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.node_offset = offsetof(struct apk_atom_hashnode, hash_node),
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.get_key = atom_hash_get_key,
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.hash_key = apk_blob_hash,
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.compare = apk_blob_compare,
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.delete_item = (apk_hash_delete_f) free,
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};
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void apk_atom_init(struct apk_atom_pool *atoms)
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{
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apk_hash_init(&atoms->hash, &atom_ops, 10000);
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}
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void apk_atom_free(struct apk_atom_pool *atoms)
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{
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apk_hash_free(&atoms->hash);
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}
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apk_blob_t *apk_atom_get(struct apk_atom_pool *atoms, apk_blob_t blob, int duplicate)
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{
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struct apk_atom_hashnode *atom;
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unsigned long hash = apk_hash_from_key(&atoms->hash, blob);
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if (blob.len < 0 || !blob.ptr) return &apk_atom_null;
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atom = (struct apk_atom_hashnode *) apk_hash_get_hashed(&atoms->hash, blob, hash);
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if (atom) return &atom->blob;
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if (duplicate) {
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char *ptr;
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atom = malloc(sizeof(*atom) + blob.len);
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ptr = (char*) (atom + 1);
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memcpy(ptr, blob.ptr, blob.len);
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atom->blob = APK_BLOB_PTR_LEN(ptr, blob.len);
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} else {
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atom = malloc(sizeof(*atom));
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atom->blob = blob;
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}
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apk_hash_insert_hashed(&atoms->hash, atom, hash);
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return &atom->blob;
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}
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