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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>
75 lines
1.9 KiB
C
75 lines
1.9 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_BLOCK_H
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#define REFTABLE_BLOCK_H
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#include "reftable-system.h"
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#include "reftable-basics.h"
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#include "reftable-blocksource.h"
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#include "reftable-iterator.h"
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struct z_stream_s;
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/*
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* A block part of a reftable. Contains records as well as some metadata
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* describing them.
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*/
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struct reftable_block {
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/*
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* Offset of the block header; nonzero for the first block in a
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* reftable.
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*/
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uint32_t header_off;
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/* The memory block. */
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struct reftable_block_data block_data;
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uint32_t hash_size;
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/* Uncompressed data for log entries. */
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struct z_stream_s *zstream;
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unsigned char *uncompressed_data;
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size_t uncompressed_cap;
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/*
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* Restart point data. Restart points are located after the block's
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* record data.
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*/
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uint16_t restart_count;
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uint32_t restart_off;
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/*
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* Size of the data in the file. For log blocks, this is the compressed
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* size.
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*/
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uint32_t full_block_size;
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uint8_t block_type;
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};
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/* Initialize a reftable block from the given block source. */
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int reftable_block_init(struct reftable_block *b,
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struct reftable_block_source *source,
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uint32_t offset, uint32_t header_size,
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uint32_t table_block_size, uint32_t hash_size,
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uint8_t want_type);
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/* Release resources allocated by the block. */
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void reftable_block_release(struct reftable_block *b);
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/* Initialize a generic record iterator from the given block. */
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int reftable_block_init_iterator(const struct reftable_block *b,
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struct reftable_iterator *it);
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/* Returns the block type (eg. 'r' for refs). */
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uint8_t reftable_block_type(const struct reftable_block *b);
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/* Decodes the first key in the block. */
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int reftable_block_first_key(const struct reftable_block *b, struct reftable_buf *key);
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#endif /* REFTABLE_BLOCK_H */
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