分类： 嵌入式
2025-07-16 17:32:37
前面我们推荐了miniz压缩库,该库不是特别适合MCU等低资源平台,所以这一篇继续来分享一个适合MCU平台的压缩库miniLZO。
miniLZO项目见
该库很久没有更新了，{BANNED}最佳后更新是17年。之前也在不同的MCU项目中用过该库,非常好用。
该库有以下特点:
lminiLZO是一个用ANSI C编写的可移植的无损数据压缩库。
l提供相当快的压缩和极快的解压,特别适合协议传输,数据采集等实时压缩应用场景。
l{BANNED}最佳快的压缩和解压缩算法之一。测试见。
l包括较慢的压缩级别，实现相当有竞争力的压缩比，同时仍然以非常高的速度解压缩。 低于要求解压快的场合非常适用。
l在GNU通用公共许可证（GPL v2+）的条款下发布。LZO Professional 是其商业版本
lminiLZO是LZO库的一个非常轻量级的子集，用于方便地包含在应用程序中。它是从LZO源代码自动生成的，包含了{BANNED}最佳重要的LZO函数。方便快速集成到自己的应用中。
Lzo代码
Minilzo代码
解压lzo-2.10.tar.gz
只需要minilzo中的minilzo.c和minlzo.h, testmini.c
还需要include/lzo下的lzoconf.h和lzodefs.h
将上述5个文件添加到自己的项目
在工程级别定义宏MINILZO_HAVE_CONFIG_H
比如-DMINILZO_HAVE_CONFIG_H
Minilzo.h中
/* internal Autoconf configuration file - only used when building miniLZO */
我们为了避免文件同名改为
/* internal Autoconf configuration file - only used when building miniLZO */
同样的minilzo.c中的
改为
Lzoconf.h中的
改为
添加自己的”minilzo_config.h”文件
其中按照平台定义以下宏
#define SIZEOF_VOID_P 4
#define LZO_ABI_LITTLE_ENDIAN 1 小端系统
#define LZO_OPT_UNALIGNED16 0 不支持不对齐访问
#define LZO_OPT_UNALIGNED32 0
#define LZO_OPT_UNALIGNED64 0
Minilzo.c中
定义宏LZO_DEBUG比如
-DLZO_DEBUG
则不会定义宏define NDEBUG 1
此时需要实现宏DVAL_ASSERT
static void __attribute__((__unused__))static voidDVAL_ASSERT(lzo_xint dv, const lzo_bytep p){ lzo_xint df; DVAL_FIRST(df,(p)); assert(DINDEX(dv,p) == DINDEX(df,p));}
可以在minilzo_config.h中
/* testmini.c -- very simple test program for the miniLZO library This file is part of the LZO real-time data compression library. Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer All Rights Reserved. The LZO library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The LZO library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the LZO library; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. Markus F.X.J. Oberhumer *//*************************************************************************// This program shows the basic usage of the LZO library.// We will compress a block of data and decompress again.//// For more information, documentation, example programs and other support// files (like Makefiles and build scripts) please download the full LZO// package from// **************************************************************************//* First let's include "minizo.h". *//* We want to compress the data block at 'in' with length 'IN_LEN' to * the block at 'out'. Because the input block may be incompressible, * we must provide a little more output space in case that compression * is not possible. */static unsigned char __LZO_MMODEL in [ IN_LEN ];static unsigned char __LZO_MMODEL out [ OUT_LEN ];/* Work-memory needed for compression. Allocate memory in units * of 'lzo_align_t' (instead of 'char') to make sure it is properly aligned. */ lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]static HEAP_ALLOC(wrkmem, LZO1X_1_MEM_COMPRESS);/*************************************************************************//**************************************************************************/int minilzo_test(int argc, char *argv[]);int minilzo_test(int argc, char *argv[]){ int r; lzo_uint in_len; lzo_uint out_len; lzo_uint new_len; if (argc < 0 && argv == NULL) /* avoid warning about unused args */ return 0; printf("\nLZO real-time data compression library (v%s, %s).\n", lzo_version_string(), lzo_version_date()); printf("Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n"); printf("wrkmem len %d.\n\n",LZO1X_1_MEM_COMPRESS);/* * Step 1: initialize the LZO library */ if (lzo_init() != LZO_E_OK) { printf("internal error - lzo_init() failed !!!\n"); printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable '-DLZO_DEBUG' for diagnostics)\n"); return 3; }/* * Step 2: prepare the input block that will get compressed. * We just fill it with zeros in this example program, * but you would use your real-world data here. */ in_len = IN_LEN; lzo_memset(in,0,in_len);/* * Step 3: compress from 'in' to 'out' with LZO1X-1 */ r = lzo1x_1_compress(in,in_len,out,&out_len,wrkmem); if (r == LZO_E_OK) printf("compressed %lu bytes into %lu bytes\n", (unsigned long) in_len, (unsigned long) out_len); else { /* this should NEVER happen */ printf("internal error - compression failed: %d\n", r); return 2; } /* check for an incompressible block */ if (out_len >= in_len) { printf("This block contains incompressible data.\n"); return 0; }/* * Step 4: decompress again, now going from 'out' to 'in' */ new_len = in_len; r = lzo1x_decompress(out,out_len,in,&new_len,NULL); if (r == LZO_E_OK && new_len == in_len) printf("decompressed %lu bytes back into %lu bytes\n", (unsigned long) out_len, (unsigned long) in_len); else { /* this should NEVER happen */ printf("internal error - decompression failed: %d\n", r); return 1; } printf("\nminiLZO simple compression test passed.\n"); return 0;}/* vim:set ts=4 sw=4 et: */
#define LZO1X_1_MEM_COMPRESS ((lzo_uint32_t) (16384L * lzo_sizeof_dict_t))
#define LZO1X_1_MEM_COMPRESS ((lzo_uint32_t) (16384L * lzo_sizeof_dict_t))
#define LZO1X_1_MEM_COMPRESS ((lzo_uint32_t) (1024u * lzo_sizeof_dict_t))
