1 /* ----------------------------------------------------------------------- *
3 * Copyright 2009 Intel Corporation; author: H. Peter Anvin
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
8 * Boston MA 02110-1301, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
11 * ----------------------------------------------------------------------- */
14 This file is based in part on:
16 precomp2.c -- example program: how to generate pre-compressed data
18 This file is part of the LZO real-time data compression library.
20 Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
21 Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
22 Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
23 Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
24 Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
25 Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
26 Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
27 Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
28 Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
29 Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
30 Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
31 Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
32 Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
35 The LZO library is free software; you can redistribute it and/or
36 modify it under the terms of the GNU General Public License as
37 published by the Free Software Foundation; either version 2 of
38 the License, or (at your option) any later version.
40 The LZO library is distributed in the hope that it will be useful,
41 but WITHOUT ANY WARRANTY; without even the implied warranty of
42 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
43 GNU General Public License for more details.
45 You should have received a copy of the GNU General Public License
46 along with the LZO library; see the file COPYING.
47 If not, write to the Free Software Foundation, Inc.,
48 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
50 Markus F.X.J. Oberhumer
51 <markus@oberhumer.com>
52 http://www.oberhumer.com/opensource/lzo/
55 #include "lzo/lzoconf.h"
56 #include "lzo/lzo1x.h"
59 lzo1x_999_compress_internal(const lzo_bytep in, lzo_uint in_len,
60 lzo_bytep out, lzo_uintp out_len,
62 const lzo_bytep dict, lzo_uint dict_len,
68 lzo_uint max_chain, lzo_uint32 flags);
71 lzo1y_999_compress_internal(const lzo_bytep in, lzo_uint in_len,
72 lzo_bytep out, lzo_uintp out_len,
74 const lzo_bytep dict, lzo_uint dict_len,
80 lzo_uint max_chain, lzo_uint32 flags);
95 uint32_t pfx_compressed;
96 uint32_t pfx_cdatalen;
97 uint32_t pfx_checksum;
101 static inline uint32_t get_32(const uint32_t * p)
103 #if defined(__i386__) || defined(__x86_64__)
104 /* Littleendian and unaligned-capable */
107 const uint8_t *pp = (const uint8_t *)p;
108 return (uint32_t) pp[0] + ((uint32_t) pp[1] << 8) +
109 ((uint32_t) pp[2] << 16) + ((uint32_t) pp[3] << 24);
113 static inline void set_32(uint32_t * p, uint32_t v)
115 #if defined(__i386__) || defined(__x86_64__)
116 /* Littleendian and unaligned-capable */
119 uint8_t *pp = (uint8_t *) p;
121 pp[1] = ((v >> 8) & 0xff);
122 pp[2] = ((v >> 16) & 0xff);
123 pp[3] = ((v >> 24) & 0xff);
127 /*************************************************************************
129 **************************************************************************/
131 int __lzo_cdecl_main main(int argc, char *argv[])
135 const int max_try_lazy = 5;
136 const lzo_uint big = 65536L; /* can result in very slow compression */
137 const lzo_uint32 flags = 0x1;
141 lzo_uint in_len, infile_len, start, offset, soff;
144 lzo_uint out_bufsize;
145 lzo_uint out_len = 0;
146 lzo_uint outfile_len;
150 lzo_byte wrkmem[LZO1X_999_MEM_COMPRESS];
156 lzo_uint32 uncompressed_checksum;
157 lzo_uint32 compressed_checksum;
160 const char *progname = NULL;
161 const char *in_name = NULL;
162 const char *out_name = NULL;
165 struct prefix *prefix;
169 printf("usage: %s file output-file\n", progname);
177 * Step 1: initialize the LZO library
179 if (lzo_init() != LZO_E_OK) {
180 printf("internal error - lzo_init() failed !!!\n");
182 ("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable `-DLZO_DEBUG' for diagnostics)\n");
187 * Step 3: open the input file
189 f = fopen(in_name, "rb");
191 printf("%s: cannot open file %s\n", progname, in_name);
194 fseek(f, 0, SEEK_END);
196 fseek(f, 0, SEEK_SET);
198 printf("%s: %s: empty file\n", progname, in_name);
202 infile_len = (lzo_uint) l;
203 out_bufsize = infile_len + infile_len / 16 + 64 + 3 + 2048;
206 * Step 4: allocate compression buffers and read the file
208 infile = (lzo_bytep) malloc(infile_len);
209 out = (lzo_bytep) malloc(out_bufsize);
210 if (infile == NULL || out == NULL) {
211 printf("%s: out of memory\n", progname);
214 infile_len = (lzo_uint) fread(infile, 1, infile_len, f);
218 * Select the portion which is for compression...
220 prefix = (struct prefix *)infile;
221 start = get_32(&prefix->pfx_start);
222 offset = get_32(&prefix->pfx_compressed);
223 in = infile + offset;
224 in_len = infile_len - offset;
228 * Step 5: compute a checksum of the uncompressed data
230 uncompressed_checksum = lzo_adler32(0, NULL, 0);
231 uncompressed_checksum = lzo_adler32(uncompressed_checksum, in, in_len);
234 * Step 6a: compress from `in' to `out' with LZO1X-999
236 for (lazy = 0; lazy <= max_try_lazy; lazy++) {
237 out_len = out_bufsize;
238 r = lzo1x_999_compress_internal(in, in_len, out, &out_len, wrkmem,
240 lazy, big, big, big, big, flags);
242 /* this should NEVER happen */
243 printf("internal error - compression failed: %d\n", r);
246 if (out_len < best_len) {
253 * Step 7: check if compressible
255 if (best_len >= in_len) {
256 printf("This file contains incompressible data.\n");
257 /* return 0; -- Sucks to be us -hpa ... */
261 * Step 8: compress data again using the best compressor found
263 out_len = out_bufsize;
264 r = lzo1x_999_compress_internal(in, in_len, out, &out_len, wrkmem,
266 best_lazy, big, big, big, big, flags);
267 assert(r == LZO_E_OK);
268 assert(out_len == best_len);
271 * Step 9: optimize compressed data (compressed data is in `out' buffer)
274 /* Optimization does not require any data in the buffer that will
275 * hold the uncompressed data. To prove this, we clear the buffer.
277 memset(in, 0, in_len);
281 r = lzo1x_optimize(out, out_len, in, &orig_len, NULL);
282 if (r != LZO_E_OK || orig_len != in_len) {
283 /* this should NEVER happen */
284 printf("internal error - optimization failed: %d\n", r);
289 * Step 10: compute a checksum of the compressed data
291 compressed_checksum = lzo_adler32(0, NULL, 0);
292 compressed_checksum = lzo_adler32(compressed_checksum, out, out_len);
295 * Step 11: write compressed data to a file
297 /* Make sure we have up to 2048 bytes of zero after the output */
298 memset(out + out_len, 0, 2048);
300 outfile_len = out_len;
302 soff = get_32(&prefix->pfx_cdatalen);
303 set_32((uint32_t *) (infile + soff), out_len);
305 soff = get_32(&prefix->pfx_checksum);
307 /* ISOLINUX padding and checksumming */
311 ((offset - start + out_len + 2047) & ~2047) - (offset - start);
312 for (ptr = 64; ptr < offset; ptr += 4)
313 csum += get_32((uint32_t *) (infile + ptr));
314 for (ptr = 0; ptr < outfile_len; ptr += 4)
315 csum += get_32((uint32_t *) (out + ptr));
317 set_32((uint32_t *) (infile + soff), offset - start + outfile_len);
318 set_32((uint32_t *) (infile + soff + 4), csum);
321 if (offset+outfile_len > get_32(&prefix->pfx_maxlma)) {
322 printf("%s: output too big (%lu, max %lu)\n",
323 (unsigned long)offset+outfile_len,
324 (unsigned long)get_32(&prefix->pfx_maxlma));
328 f = fopen(out_name, "wb");
330 printf("%s: cannot open output file %s\n", progname, out_name);
333 if (fwrite(infile + start, 1, offset - start, f) != offset - start ||
334 fwrite(out, 1, outfile_len, f) != outfile_len || fclose(f)) {
335 printf("%s: write error !!\n", progname);
340 * Step 12: verify decompression
343 test = calloc(in_len,2);
345 r = lzo1x_decompress_safe(out, out_len, test, &orig_len, NULL);
347 if (r != LZO_E_OK || orig_len != in_len) {
348 /* this should NEVER happen */
349 printf("internal error - decompression failed: %d\n", r);
352 if (memcmp(test, in, in_len)) {
353 /* this should NEVER happen */
354 printf("internal error - decompression data error\n");
357 /* Now you could also verify decompression under similar conditions as in
358 * your application, e.g. overlapping assembler decompression etc.