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