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/*
* Copyright (c) 2022 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef HICNLIGHT_INTEREST_MANIFEST_H
#define HICNLIGHT_INTEREST_MANIFEST_H
#include <string.h>
#include <stdbool.h>
#include <hicn/util/bitmap.h>
#include <hicn/base.h>
typedef enum
{
INT_MANIFEST_SPLIT_STRATEGY_NONE,
INT_MANIFEST_SPLIT_STRATEGY_MAX_N_SUFFIXES,
INT_MANIFEST_SPLIT_N_STRATEGIES,
} int_manifest_split_strategy_t;
#define MAX_SUFFIXES_IN_MANIFEST 256
#define DEFAULT_DISAGGREGATION_STRATEGY \
INT_MANIFEST_SPLIT_STRATEGY_MAX_N_SUFFIXES
#define DEFAULT_N_SUFFIXES_PER_SPLIT MAX_SUFFIXES_IN_MANIFEST
#define BITMAP_SIZE (MAX_SUFFIXES_IN_MANIFEST / WORD_WIDTH)
typedef struct
{
/* This can be 16 bits, but we use 32 bits for alignment */
uint32_t n_suffixes;
/* Align to 64 bits */
uint32_t padding;
hicn_uword request_bitmap[BITMAP_SIZE];
/* Followed by the list of prefixes to ask */
/* ... */
} interest_manifest_header_t;
static_assert (sizeof (interest_manifest_header_t) == 32 + 4 + 4,
"interest_manifest_header_t size must be 40 bytes");
static inline bool
interest_manifest_is_valid (interest_manifest_header_t *int_manifest_header,
size_t payload_length)
{
if (int_manifest_header->n_suffixes == 0 ||
int_manifest_header->n_suffixes > MAX_SUFFIXES_IN_MANIFEST)
{
return false;
}
hicn_uword empty_bitmap[BITMAP_SIZE] = { 0 };
if (memcmp (empty_bitmap, int_manifest_header->request_bitmap,
sizeof (empty_bitmap)) == 0)
{
return false;
}
if (payload_length - sizeof (interest_manifest_header_t) !=
int_manifest_header->n_suffixes * sizeof (u32))
{
return false;
}
return true;
}
static inline size_t
interest_manifest_update_bitmap (const hicn_uword *initial_bitmap,
hicn_uword *bitmap_to_update, size_t start,
size_t n, size_t max_suffixes)
{
size_t i = start, n_ones = 0;
while (i < n)
{
if (bitmap_is_set_no_check (initial_bitmap, i))
{
bitmap_set_no_check (bitmap_to_update, i);
n_ones++;
}
i++;
if (n_ones == max_suffixes)
break;
}
return i;
}
#endif /* HICNLIGHT_INTEREST_MANIFEST_H */
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