1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
218 lines
7.3 KiB
C
218 lines
7.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2000-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License ("GPL") version 2 or any later version,
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* in which case the provisions of the GPL are applicable instead of
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* the above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the BSD license, indicate your decision
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* by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file under
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* either the BSD or the GPL.
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*/
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#ifndef LZF_H
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#define LZF_H
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/***********************************************************************
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**
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** lzf -- an extremely fast/free compression/decompression-method
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** http://liblzf.plan9.de/
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**
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** This algorithm is believed to be patent-free.
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**
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***********************************************************************/
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#define LZF_VERSION 0x0105 /* 1.5, API version */
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/*
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* Compress in_len bytes stored at the memory block starting at
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* in_data and write the result to out_data, up to a maximum length
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* of out_len bytes.
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*
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* If the output buffer is not large enough or any error occurs return 0,
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* otherwise return the number of bytes used, which might be considerably
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* more than in_len (but less than 104% of the original size), so it
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* makes sense to always use out_len == in_len - 1), to ensure _some_
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* compression, and store the data uncompressed otherwise (with a flag, of
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* course.
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*
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* lzf_compress might use different algorithms on different systems and
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* even different runs, thus might result in different compressed strings
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* depending on the phase of the moon or similar factors. However, all
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* these strings are architecture-independent and will result in the
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* original data when decompressed using lzf_decompress.
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*
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* The buffers must not be overlapping.
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*
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* If the option LZF_STATE_ARG is enabled, an extra argument must be
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* supplied which is not reflected in this header file. Refer to lzfP.h
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* and lzf_c.c.
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*
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*/
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unsigned int
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lzf_compress (const void *const in_data, unsigned int in_len,
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void *out_data, unsigned int out_len);
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/*
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* Decompress data compressed with some version of the lzf_compress
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* function and stored at location in_data and length in_len. The result
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* will be stored at out_data up to a maximum of out_len characters.
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*
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* If the output buffer is not large enough to hold the decompressed
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* data, a 0 is returned and errno is set to E2BIG. Otherwise the number
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* of decompressed bytes (i.e. the original length of the data) is
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* returned.
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*
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* If an error in the compressed data is detected, a zero is returned and
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* errno is set to EINVAL.
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*
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* This function is very fast, about as fast as a copying loop.
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*/
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unsigned int
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lzf_decompress (const void *const in_data, unsigned int in_len,
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void *out_data, unsigned int out_len);
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/*
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* Size of hashtable is (1 << HLOG) * sizeof (char *)
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* decompression is independent of the hash table size
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* the difference between 15 and 14 is very small
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* for small blocks (and 14 is usually a bit faster).
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* For a low-memory/faster configuration, use HLOG == 13;
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* For best compression, use 15 or 16 (or more, up to 23).
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*/
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#ifndef HLOG
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# define HLOG 16
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#endif
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/*
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* Sacrifice very little compression quality in favour of compression speed.
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* This gives almost the same compression as the default code, and is
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* (very roughly) 15% faster. This is the preferred mode of operation.
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*/
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#ifndef VERY_FAST
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# define VERY_FAST 1
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#endif
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/*
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* Sacrifice some more compression quality in favour of compression speed.
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* (roughly 1-2% worse compression for large blocks and
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* 9-10% for small, redundant, blocks and >>20% better speed in both cases)
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* In short: when in need for speed, enable this for binary data,
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* possibly disable this for text data.
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*/
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#ifndef ULTRA_FAST
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# define ULTRA_FAST 0
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#endif
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/*
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* Unconditionally aligning does not cost very much, so do it if unsure
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*/
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#ifndef STRICT_ALIGN
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# if !(defined(__i386) || defined (__amd64))
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# define STRICT_ALIGN 1
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# else
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# define STRICT_ALIGN 0
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# endif
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#endif
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/*
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* You may choose to pre-set the hash table (might be faster on some
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* modern cpus and large (>>64k) blocks, and also makes compression
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* deterministic/repeatable when the configuration otherwise is the same).
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*/
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#ifndef INIT_HTAB
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# define INIT_HTAB 1
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#endif
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/*
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* Avoid assigning values to errno variable? for some embedding purposes
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* (linux kernel for example), this is necessary. NOTE: this breaks
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* the documentation in lzf.h.
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*/
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#ifndef AVOID_ERRNO
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# define AVOID_ERRNO 0
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#endif
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/*
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* Wether to pass the LZF_STATE variable as argument, or allocate it
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* on the stack. For small-stack environments, define this to 1.
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* NOTE: this breaks the prototype in lzf.h.
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*/
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#ifndef LZF_STATE_ARG
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# define LZF_STATE_ARG 0
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#endif
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/*
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* Wether to add extra checks for input validity in lzf_decompress
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* and return EINVAL if the input stream has been corrupted. This
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* only shields against overflowing the input buffer and will not
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* detect most corrupted streams.
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* This check is not normally noticeable on modern hardware
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* (<1% slowdown), but might slow down older cpus considerably.
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*/
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#ifndef CHECK_INPUT
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# define CHECK_INPUT 1
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#endif
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/*****************************************************************************/
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/* nothing should be changed below */
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typedef unsigned char u8;
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typedef const u8 *LZF_STATE[1 << (HLOG)];
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#if !STRICT_ALIGN
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/* for unaligned accesses we need a 16 bit datatype. */
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# include <limits.h>
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# if USHRT_MAX == 65535
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typedef unsigned short u16;
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# elif UINT_MAX == 65535
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typedef unsigned int u16;
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# else
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# undef STRICT_ALIGN
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# define STRICT_ALIGN 1
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# endif
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#endif
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#if ULTRA_FAST
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# if defined(VERY_FAST)
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# undef VERY_FAST
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# endif
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#endif
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#if INIT_HTAB
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# ifdef __cplusplus
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# include <cstring>
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# else
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# include <string.h>
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# endif
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#endif
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#endif
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