655e18d6b4
While users of the reftable library wouldn't generally require access to individual blocks in a reftable table, there are valid usecases where one may require low-level access to them. One such upcoming usecase in the Git codebase is to implement consistency checks for the reftable library where we want to verify each block individually. Create a public interface for reading blocks. The interface isn't yet complete and lacks e.g. a way to read individual records from a block. Such missing functionality will be backfilled in subsequent commits. Note that this change also requires us to expose `reftable_buf`, which is used by the `reftable_block_first_key()` function. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
/*
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* Copyright 2020 Google LLC
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*
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* Use of this source code is governed by a BSD-style
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* license that can be found in the LICENSE file or at
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* https://developers.google.com/open-source/licenses/bsd
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*/
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#ifndef REFTABLE_BASICS_H
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#define REFTABLE_BASICS_H
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#include <stddef.h>
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/* A buffer that contains arbitrary byte slices. */
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struct reftable_buf {
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size_t alloc;
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size_t len;
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char *buf;
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};
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#define REFTABLE_BUF_INIT { 0 }
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/*
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* Hash functions understood by the reftable library. Note that the values are
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* arbitrary and somewhat random such that we can easily detect cases where the
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* hash hasn't been properly set up.
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*/
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enum reftable_hash {
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REFTABLE_HASH_SHA1 = 89,
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REFTABLE_HASH_SHA256 = 247,
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};
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#define REFTABLE_HASH_SIZE_SHA1 20
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#define REFTABLE_HASH_SIZE_SHA256 32
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#define REFTABLE_HASH_SIZE_MAX REFTABLE_HASH_SIZE_SHA256
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/* Overrides the functions to use for memory management. */
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void reftable_set_alloc(void *(*malloc)(size_t),
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void *(*realloc)(void *, size_t), void (*free)(void *));
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#endif
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