forked from Qortal/Brooklyn
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/*
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* Copyright © 2020 Valve Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/* This is a basic c implementation of a fossilize db like format intended for
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* use with the Mesa shader cache.
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*
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* The format is compatible enough to allow the fossilize db tools to be used
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* to do things like merge db collections, but unlike fossilize db which uses
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* a zlib implementation for compression of data entries, we use zstd for
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* compression.
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*/
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#ifndef FOSSILIZE_DB_H
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#define FOSSILIZE_DB_H
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#ifdef HAVE_FLOCK
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#define FOZ_DB_UTIL 1
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#endif
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "simple_mtx.h"
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/* Max number of DBs our implementation can read from at once */
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#define FOZ_MAX_DBS 9 /* Default DB + 8 Read only DBs */
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#define FOSSILIZE_BLOB_HASH_LENGTH 40
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enum {
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FOSSILIZE_COMPRESSION_NONE = 1,
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FOSSILIZE_COMPRESSION_DEFLATE = 2
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};
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enum {
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FOSSILIZE_FORMAT_VERSION = 6,
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FOSSILIZE_FORMAT_MIN_COMPAT_VERSION = 5
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};
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struct foz_payload_header {
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uint32_t payload_size;
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uint32_t format;
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uint32_t crc;
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uint32_t uncompressed_size;
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};
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struct foz_db_entry {
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uint8_t file_idx;
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uint8_t key[20];
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uint64_t offset;
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struct foz_payload_header header;
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};
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struct foz_db {
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FILE *file[FOZ_MAX_DBS]; /* An array of all foz dbs */
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FILE *db_idx; /* The default writable foz db idx */
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simple_mtx_t mtx; /* Mutex for file/hash table read/writes */
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simple_mtx_t flock_mtx; /* Mutex for flocking the file for writes */
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void *mem_ctx;
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struct hash_table_u64 *index_db; /* Hash table of all foz db entries */
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bool alive;
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};
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bool
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foz_prepare(struct foz_db *foz_db, char *cache_path);
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void
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foz_destroy(struct foz_db *foz_db);
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void *
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foz_read_entry(struct foz_db *foz_db, const uint8_t *cache_key_160bit,
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size_t *size);
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bool
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foz_write_entry(struct foz_db *foz_db, const uint8_t *cache_key_160bit,
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const void *blob, size_t size);
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#endif /* FOSSILIZE_DB_H */
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