linux/fs/bcachefs/varint.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/bitops.h>
#include <linux/math.h>
#include <linux/string.h>
#include <asm/unaligned.h>

#ifdef CONFIG_VALGRIND
#include <valgrind/memcheck.h>
#endif

#include "varint.h"

/**
 * bch2_varint_encode - encode a variable length integer
 * @out:	destination to encode to
 * @v:		unsigned integer to encode
 * Returns:	size in bytes of the encoded integer - at most 9 bytes
 */
int bch2_varint_encode(u8 *out, u64 v)
{ … }

/**
 * bch2_varint_decode - encode a variable length integer
 * @in:		varint to decode
 * @end:	end of buffer to decode from
 * @out:	on success, decoded integer
 * Returns:	size in bytes of the decoded integer - or -1 on failure (would
 * have read past the end of the buffer)
 */
int bch2_varint_decode(const u8 *in, const u8 *end, u64 *out)
{ … }

/**
 * bch2_varint_encode_fast - fast version of bch2_varint_encode
 * @out:	destination to encode to
 * @v:		unsigned integer to encode
 * Returns:	size in bytes of the encoded integer - at most 9 bytes
 *
 * This version assumes it's always safe to write 8 bytes to @out, even if the
 * encoded integer would be smaller.
 */
int bch2_varint_encode_fast(u8 *out, u64 v)
{ … }

/**
 * bch2_varint_decode_fast - fast version of bch2_varint_decode
 * @in:		varint to decode
 * @end:	end of buffer to decode from
 * @out:	on success, decoded integer
 * Returns:	size in bytes of the decoded integer - or -1 on failure (would
 * have read past the end of the buffer)
 *
 * This version assumes that it is safe to read at most 8 bytes past the end of
 * @end (we still return an error if the varint extends past @end).
 */
int bch2_varint_decode_fast(const u8 *in, const u8 *end, u64 *out)
{ … }