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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) 1996-2017 Markus Franz Xaver Johannes Oberhumer | |
6 | All Rights Reserved. | |
7 | ||
8 | The LZO library is free software; you can redistribute it and/or | |
9 | modify it under the terms of the GNU General Public License as | |
10 | published by the Free Software Foundation; either version 2 of | |
11 | the License, or (at your option) any later version. | |
12 | ||
13 | The LZO library is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with the LZO library; see the file COPYING. | |
20 | If not, write to the Free Software Foundation, Inc., | |
21 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
22 | ||
23 | Markus F.X.J. Oberhumer | |
24 | <markus@oberhumer.com> | |
25 | http://www.oberhumer.com/opensource/lzo/ | |
26 | */ | |
27 | ||
28 | ||
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | ||
32 | ||
33 | /************************************************************************* | |
34 | // This program shows the basic usage of the LZO library. | |
35 | // We will compress a block of data and decompress again. | |
36 | // | |
37 | // For more information, documentation, example programs and other support | |
38 | // files (like Makefiles and build scripts) please download the full LZO | |
39 | // package from | |
40 | // http://www.oberhumer.com/opensource/lzo/ | |
41 | **************************************************************************/ | |
42 | ||
43 | /* First let's include "minizo.h". */ | |
44 | ||
45 | #include "minilzo.h" | |
46 | ||
47 | ||
48 | /* We want to compress the data block at 'in' with length 'IN_LEN' to | |
49 | * the block at 'out'. Because the input block may be incompressible, | |
50 | * we must provide a little more output space in case that compression | |
51 | * is not possible. | |
52 | */ | |
53 | ||
54 | #define IN_LEN (128*1024ul) | |
55 | #define OUT_LEN (IN_LEN + IN_LEN / 16 + 64 + 3) | |
56 | ||
57 | static unsigned char __LZO_MMODEL in [ IN_LEN ]; | |
58 | static unsigned char __LZO_MMODEL out [ OUT_LEN ]; | |
59 | ||
60 | ||
61 | /* Work-memory needed for compression. Allocate memory in units | |
62 | * of 'lzo_align_t' (instead of 'char') to make sure it is properly aligned. | |
63 | */ | |
64 | ||
65 | #define HEAP_ALLOC(var,size) \ | |
66 | lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ] | |
67 | ||
68 | static HEAP_ALLOC(wrkmem, LZO1X_1_MEM_COMPRESS); | |
69 | ||
70 | ||
71 | /************************************************************************* | |
72 | // | |
73 | **************************************************************************/ | |
74 | ||
75 | int main(int argc, char *argv[]) | |
76 | { | |
77 | int r; | |
78 | lzo_uint in_len; | |
79 | lzo_uint out_len; | |
80 | lzo_uint new_len; | |
81 | ||
82 | if (argc < 0 && argv == NULL) /* avoid warning about unused args */ | |
83 | return 0; | |
84 | ||
85 | printf("\nLZO real-time data compression library (v%s, %s).\n", | |
86 | lzo_version_string(), lzo_version_date()); | |
87 | printf("Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n"); | |
88 | ||
89 | ||
90 | /* | |
91 | * Step 1: initialize the LZO library | |
92 | */ | |
93 | if (lzo_init() != LZO_E_OK) | |
94 | { | |
95 | printf("internal error - lzo_init() failed !!!\n"); | |
96 | printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable '-DLZO_DEBUG' for diagnostics)\n"); | |
97 | return 3; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Step 2: prepare the input block that will get compressed. | |
102 | * We just fill it with zeros in this example program, | |
103 | * but you would use your real-world data here. | |
104 | */ | |
105 | in_len = IN_LEN; | |
106 | lzo_memset(in,0,in_len); | |
107 | ||
108 | /* | |
109 | * Step 3: compress from 'in' to 'out' with LZO1X-1 | |
110 | */ | |
111 | r = lzo1x_1_compress(in,in_len,out,&out_len,wrkmem); | |
112 | if (r == LZO_E_OK) | |
113 | printf("compressed %lu bytes into %lu bytes\n", | |
114 | (unsigned long) in_len, (unsigned long) out_len); | |
115 | else | |
116 | { | |
117 | /* this should NEVER happen */ | |
118 | printf("internal error - compression failed: %d\n", r); | |
119 | return 2; | |
120 | } | |
121 | /* check for an incompressible block */ | |
122 | if (out_len >= in_len) | |
123 | { | |
124 | printf("This block contains incompressible data.\n"); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Step 4: decompress again, now going from 'out' to 'in' | |
130 | */ | |
131 | new_len = in_len; | |
132 | r = lzo1x_decompress(out,out_len,in,&new_len,NULL); | |
133 | if (r == LZO_E_OK && new_len == in_len) | |
134 | printf("decompressed %lu bytes back into %lu bytes\n", | |
135 | (unsigned long) out_len, (unsigned long) in_len); | |
136 | else | |
137 | { | |
138 | /* this should NEVER happen */ | |
139 | printf("internal error - decompression failed: %d\n", r); | |
140 | return 1; | |
141 | } | |
142 | ||
143 | printf("\nminiLZO simple compression test passed.\n"); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | ||
148 | /* vim:set ts=4 sw=4 et: */ |