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34c17b840d
We're including a couple of standard headers like <stdint.h> in a bunch
of locations, which makes it hard for a project to plug in their own
logic for making required functionality available. For us this is for
example via "compat/posix.h", which already includes all of the system
headers relevant to us.
Introduce a new "reftable-system.h" header that allows projects to
provide their own headers. This new header is supposed to contain all
the project-specific bits to provide the POSIX-like environment, and some
additional supporting code. With this change, we thus have the following
split in our system-specific code:
- "reftable/reftable-system.h" is the project-specific header that
provides a POSIX-like environment. Every project is expected to
provide their own implementation.
- "reftable/system.h" contains the project-independent definition of
the interfaces that a project needs to implement. This file should
not be touched by a project.
- "reftable/system.c" contains the project-specific implementation of
the interfaces defined in "system.h". Again, every project is
expected to provide their own implementation.
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 "reftable-system.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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