git-hulk commented on code in PR #1684: URL: https://github.com/apache/kvrocks/pull/1684#discussion_r1304383994
########## src/vendor/lzf.h: ########## @@ -0,0 +1,201 @@ +/* + * Copyright (c) 2000-2007 Marc Alexander Lehmann <[email protected]> + * + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + +#pragma once + +#include <stddef.h> +// NOLINTBEGIN + +/* + * Decompress data compressed with some version of the lzf_compress + * function and stored at location in_data and length in_len. The result + * will be stored at out_data up to a maximum of out_len characters. + * + * If the output buffer is not large enough to hold the decompressed + * data, a 0 is returned and errno is set to E2BIG. Otherwise the number + * of decompressed bytes (i.e. the original length of the data) is + * returned. + * + * If an error in the compressed data is detected, a zero is returned and + * errno is set to EINVAL. + * + * This function is very fast, about as fast as a copying loop. + */ +size_t lzf_decompress(const void *const in_data, size_t in_len, void *out_data, size_t out_len); + +/* + * Size of hashtable is (1 << HLOG) * sizeof (char *) + * decompression is independent of the hash table size + * the difference between 15 and 14 is very small + * for small blocks (and 14 is usually a bit faster). + * For a low-memory/faster configuration, use HLOG == 13; + * For best compression, use 15 or 16 (or more, up to 22). + */ +#ifndef HLOG +#define HLOG 16 +#endif + +/* + * Sacrifice very little compression quality in favour of compression speed. + * This gives almost the same compression as the default code, and is + * (very roughly) 15% faster. This is the preferred mode of operation. + */ +#ifndef VERY_FAST +#define VERY_FAST 1 +#endif + +/* + * Sacrifice some more compression quality in favour of compression speed. + * (roughly 1-2% worse compression for large blocks and + * 9-10% for small, redundant, blocks and >>20% better speed in both cases) + * In short: when in need for speed, enable this for binary data, + * possibly disable this for text data. + */ +#ifndef ULTRA_FAST +#define ULTRA_FAST 0 +#endif + +/* + * Unconditionally aligning does not cost very much, so do it if unsure + */ +#ifndef STRICT_ALIGN +#if !(defined(__i386) || defined(__amd64)) +#define STRICT_ALIGN 1 +#else +#define STRICT_ALIGN 0 +#endif +#endif + +/* + * You may choose to pre-set the hash table (might be faster on some + * modern cpus and large (>>64k) blocks, and also makes compression + * deterministic/repeatable when the configuration otherwise is the same). + */ +#ifndef INIT_HTAB +#define INIT_HTAB 0 +#endif + +/* + * Avoid assigning values to errno variable? for some embedding purposes + * (linux kernel for example), this is necessary. NOTE: this breaks + * the documentation in lzf.h. Avoiding errno has no speed impact. + */ +#ifndef AVOID_ERRNO +#define AVOID_ERRNO 0 +#endif + +/* + * Whether to pass the LZF_STATE variable as argument, or allocate it + * on the stack. For small-stack environments, define this to 1. + * NOTE: this breaks the prototype in lzf.h. + */ +#ifndef LZF_STATE_ARG +#define LZF_STATE_ARG 0 +#endif + +/* + * Whether to add extra checks for input validity in lzf_decompress + * and return EINVAL if the input stream has been corrupted. This + * only shields against overflowing the input buffer and will not + * detect most corrupted streams. + * This check is not normally noticeable on modern hardware + * (<1% slowdown), but might slow down older cpus considerably. + */ +#ifndef CHECK_INPUT +#define CHECK_INPUT 1 +#endif + +/* + * Whether to store pointers or offsets inside the hash table. On + * 64 bit architectures, pointers take up twice as much space, + * and might also be slower. Default is to autodetect. + * Notice: Don't set this value to 1, it will result in 'LZF_HSLOT' + * not being able to store offset above UINT32_MAX in 64bit. */ +#define LZF_USE_OFFSETS 0 + +/*****************************************************************************/ +/* nothing should be changed below */ + +#ifdef __cplusplus +#include <climits> +#include <cstring> +using namespace std; Review Comment: It should be falsely imports by IDE when copying since C would never imports this. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
