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149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/* testmini.c -- very simple test program for the miniLZO library
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The LZO library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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http://www.oberhumer.com/opensource/lzo/
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*/
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#include <stdio.h>
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#include <stdlib.h>
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/*************************************************************************
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// This program shows the basic usage of the LZO library.
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// We will compress a block of data and decompress again.
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//
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// For more information, documentation, example programs and other support
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// files (like Makefiles and build scripts) please download the full LZO
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// package from
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// http://www.oberhumer.com/opensource/lzo/
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**************************************************************************/
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/* First let's include "minizo.h". */
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#include "minilzo.h"
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/* We want to compress the data block at 'in' with length 'IN_LEN' to
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* the block at 'out'. Because the input block may be incompressible,
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* we must provide a little more output space in case that compression
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* is not possible.
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*/
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#define IN_LEN (128*1024ul)
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#define OUT_LEN (IN_LEN + IN_LEN / 16 + 64 + 3)
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static unsigned char __LZO_MMODEL in [ IN_LEN ];
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static unsigned char __LZO_MMODEL out [ OUT_LEN ];
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/* Work-memory needed for compression. Allocate memory in units
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* of 'lzo_align_t' (instead of 'char') to make sure it is properly aligned.
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*/
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#define HEAP_ALLOC(var,size) \
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lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]
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static HEAP_ALLOC(wrkmem, LZO1X_1_MEM_COMPRESS);
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/*************************************************************************
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//
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**************************************************************************/
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int main(int argc, char *argv[])
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{
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int r;
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lzo_uint in_len;
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lzo_uint out_len;
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lzo_uint new_len;
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if (argc < 0 && argv == NULL) /* avoid warning about unused args */
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return 0;
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printf("\nLZO real-time data compression library (v%s, %s).\n",
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lzo_version_string(), lzo_version_date());
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printf("Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n");
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/*
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* Step 1: initialize the LZO library
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*/
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if (lzo_init() != LZO_E_OK)
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{
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printf("internal error - lzo_init() failed !!!\n");
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printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable '-DLZO_DEBUG' for diagnostics)\n");
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return 3;
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}
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/*
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* Step 2: prepare the input block that will get compressed.
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* We just fill it with zeros in this example program,
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* but you would use your real-world data here.
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*/
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in_len = IN_LEN;
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lzo_memset(in,0,in_len);
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/*
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* Step 3: compress from 'in' to 'out' with LZO1X-1
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*/
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r = lzo1x_1_compress(in,in_len,out,&out_len,wrkmem);
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if (r == LZO_E_OK)
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printf("compressed %lu bytes into %lu bytes\n",
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(unsigned long) in_len, (unsigned long) out_len);
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else
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{
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/* this should NEVER happen */
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printf("internal error - compression failed: %d\n", r);
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return 2;
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}
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/* check for an incompressible block */
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if (out_len >= in_len)
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{
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printf("This block contains incompressible data.\n");
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return 0;
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}
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/*
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* Step 4: decompress again, now going from 'out' to 'in'
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*/
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new_len = in_len;
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r = lzo1x_decompress(out,out_len,in,&new_len,NULL);
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if (r == LZO_E_OK && new_len == in_len)
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printf("decompressed %lu bytes back into %lu bytes\n",
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(unsigned long) out_len, (unsigned long) in_len);
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else
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{
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/* this should NEVER happen */
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printf("internal error - decompression failed: %d\n", r);
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return 1;
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}
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printf("\nminiLZO simple compression test passed.\n");
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return 0;
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}
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/* vim:set ts=4 sw=4 et: */
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