1/* testmini.c -- very simple test program for the miniLZO library
2
3   This file is part of the LZO real-time data compression library.
4
5   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
6   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
7   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
8   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
9   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
10   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
11   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
12   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
13   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
14   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
15   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
16   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
17   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
18   All Rights Reserved.
19
20   The LZO library is free software; you can redistribute it and/or
21   modify it under the terms of the GNU General Public License as
22   published by the Free Software Foundation; either version 2 of
23   the License, or (at your option) any later version.
24
25   The LZO library is distributed in the hope that it will be useful,
26   but WITHOUT ANY WARRANTY; without even the implied warranty of
27   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
28   GNU General Public License for more details.
29
30   You should have received a copy of the GNU General Public License
31   along with the LZO library; see the file COPYING.
32   If not, write to the Free Software Foundation, Inc.,
33   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
34
35   Markus F.X.J. Oberhumer
36   <markus@oberhumer.com>
37   http://www.oberhumer.com/opensource/lzo/
38 */
39
40
41#include <stdio.h>
42#include <stdlib.h>
43
44
45/*************************************************************************
46// This program shows the basic usage of the LZO library.
47// We will compress a block of data and decompress again.
48//
49// For more information, documentation, example programs and other support
50// files (like Makefiles and build scripts) please download the full LZO
51// package from
52//    http://www.oberhumer.com/opensource/lzo/
53**************************************************************************/
54
55/* First let's include "minizo.h". */
56
57#include "minilzo.h"
58
59
60/* We want to compress the data block at `in' with length `IN_LEN' to
61 * the block at `out'. Because the input block may be incompressible,
62 * we must provide a little more output space in case that compression
63 * is not possible.
64 */
65
66#if defined(__LZO_STRICT_16BIT)
67#define IN_LEN      (8*1024u)
68#elif defined(LZO_ARCH_I086) && !defined(LZO_HAVE_MM_HUGE_ARRAY)
69#define IN_LEN      (60*1024u)
70#else
71#define IN_LEN      (128*1024ul)
72#endif
73#define OUT_LEN     (IN_LEN + IN_LEN / 16 + 64 + 3)
74
75static unsigned char __LZO_MMODEL in  [ IN_LEN ];
76static unsigned char __LZO_MMODEL out [ OUT_LEN ];
77
78
79/* Work-memory needed for compression. Allocate memory in units
80 * of `lzo_align_t' (instead of `char') to make sure it is properly aligned.
81 */
82
83#define HEAP_ALLOC(var,size) \
84    lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]
85
86static HEAP_ALLOC(wrkmem,LZO1X_1_MEM_COMPRESS);
87
88
89/*************************************************************************
90//
91**************************************************************************/
92
93int main(int argc, char *argv[])
94{
95    int r;
96    lzo_uint in_len;
97    lzo_uint out_len;
98    lzo_uint new_len;
99
100    if (argc < 0 && argv == NULL)   /* avoid warning about unused args */
101        return 0;
102
103    printf("\nLZO real-time data compression library (v%s, %s).\n",
104           lzo_version_string(), lzo_version_date());
105    printf("Copyright (C) 1996-2008 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n");
106
107
108/*
109 * Step 1: initialize the LZO library
110 */
111    if (lzo_init() != LZO_E_OK)
112    {
113        printf("internal error - lzo_init() failed !!!\n");
114        printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable `-DLZO_DEBUG' for diagnostics)\n");
115        return 3;
116    }
117
118/*
119 * Step 2: prepare the input block that will get compressed.
120 *         We just fill it with zeros in this example program,
121 *         but you would use your real-world data here.
122 */
123    in_len = IN_LEN;
124    lzo_memset(in,0,in_len);
125
126/*
127 * Step 3: compress from `in' to `out' with LZO1X-1
128 */
129    r = lzo1x_1_compress(in,in_len,out,&out_len,wrkmem);
130    if (r == LZO_E_OK)
131        printf("compressed %lu bytes into %lu bytes\n",
132            (unsigned long) in_len, (unsigned long) out_len);
133    else
134    {
135        /* this should NEVER happen */
136        printf("internal error - compression failed: %d\n", r);
137        return 2;
138    }
139    /* check for an incompressible block */
140    if (out_len >= in_len)
141    {
142        printf("This block contains incompressible data.\n");
143        return 0;
144    }
145
146/*
147 * Step 4: decompress again, now going from `out' to `in'
148 */
149    new_len = in_len;
150    r = lzo1x_decompress(out,out_len,in,&new_len,NULL);
151    if (r == LZO_E_OK && new_len == in_len)
152        printf("decompressed %lu bytes back into %lu bytes\n",
153            (unsigned long) out_len, (unsigned long) in_len);
154    else
155    {
156        /* this should NEVER happen */
157        printf("internal error - decompression failed: %d\n", r);
158        return 1;
159    }
160
161    printf("\nminiLZO simple compression test passed.\n");
162    return 0;
163}
164
165/*
166vi:ts=4:et
167*/
168
169