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,
72 lzo1y_999_compress_internal ( const lzo_bytep in , lzo_uint in_len,
73 lzo_bytep out, lzo_uintp out_len,
75 const lzo_bytep dict, lzo_uint dict_len,
97 uint32_t pfx_compressed;
98 uint32_t pfx_cdatalen;
99 uint32_t pfx_checksum;
102 static inline uint32_t get_32(const uint32_t *p)
104 #if defined(__i386__) || defined(__x86_64__)
105 /* Littleendian and unaligned-capable */
108 const uint8_t *pp = (const uint8_t *)p;
109 return (uint32_t)pp[0] + ((uint32_t)pp[1] << 8) +
110 ((uint32_t)pp[2] << 16) + ((uint32_t)pp[3] << 24);
114 static inline void set_32(uint32_t *p, uint32_t v)
116 #if defined(__i386__) || defined(__x86_64__)
117 /* Littleendian and unaligned-capable */
120 uint8_t *pp = (uint8_t *)p;
122 pp[1] = ((v >> 8) & 0xff);
123 pp[2] = ((v >> 16) & 0xff);
124 pp[3] = ((v >> 24) & 0xff);
128 /*************************************************************************
130 **************************************************************************/
132 int __lzo_cdecl_main main(int argc, char *argv[])
136 const int max_try_lazy = 5;
137 const lzo_uint big = 65536L; /* can result in very slow compression */
138 const lzo_uint32 flags = 0x1;
142 lzo_uint in_len, infile_len, start, offset, soff;
145 lzo_uint out_bufsize;
146 lzo_uint out_len = 0;
147 lzo_uint outfile_len;
149 lzo_byte wrkmem[LZO1X_999_MEM_COMPRESS];
155 lzo_uint32 uncompressed_checksum;
156 lzo_uint32 compressed_checksum;
159 const char *progname = NULL;
160 const char *in_name = NULL;
161 const char *out_name = NULL;
164 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)
181 printf("internal error - lzo_init() failed !!!\n");
182 printf("(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");
192 printf("%s: cannot open file %s\n", progname, in_name);
200 printf("%s: %s: empty file\n", progname, in_name);
204 infile_len = (lzo_uint) l;
205 out_bufsize = infile_len + infile_len / 16 + 64 + 3 + 2048;
208 * Step 4: allocate compression buffers and read the file
210 infile = (lzo_bytep) malloc(infile_len);
211 out = (lzo_bytep) malloc(out_bufsize);
212 if (infile == NULL || out == NULL)
214 printf("%s: out of memory\n", progname);
217 infile_len = (lzo_uint) fread(infile,1,infile_len,f);
221 * Select the portion which is for compression...
223 prefix = (struct prefix *)infile;
224 start = get_32(&prefix->pfx_start);
225 offset = get_32(&prefix->pfx_compressed);
226 in = infile + offset;
227 in_len = infile_len - offset;
231 * Step 5: compute a checksum of the uncompressed data
233 uncompressed_checksum = lzo_adler32(0,NULL,0);
234 uncompressed_checksum = lzo_adler32(uncompressed_checksum,in,in_len);
237 * Step 6a: compress from `in' to `out' with LZO1X-999
239 for (lazy = 0; lazy <= max_try_lazy; lazy++)
241 out_len = out_bufsize;
242 r = lzo1x_999_compress_internal(in,in_len,out,&out_len,wrkmem,
244 lazy, big, big, big, big, flags);
247 /* this should NEVER happen */
248 printf("internal error - compression failed: %d\n", r);
251 if (out_len < best_len)
259 * Step 7: check if compressible
261 if (best_len >= in_len)
263 printf("This file contains incompressible data.\n");
264 /* return 0; -- Sucks to be us -hpa ... */
268 * Step 8: compress data again using the best compressor found
270 out_len = out_bufsize;
271 r = lzo1x_999_compress_internal(in,in_len,out,&out_len,wrkmem,
273 best_lazy, big, big, big, big, flags);
274 assert(r == LZO_E_OK);
275 assert(out_len == best_len);
278 * Step 9: optimize compressed data (compressed data is in `out' buffer)
281 /* Optimization does not require any data in the buffer that will
282 * hold the uncompressed data. To prove this, we clear the buffer.
288 r = lzo1x_optimize(out,out_len,in,&orig_len,NULL);
289 if (r != LZO_E_OK || orig_len != in_len)
291 /* this should NEVER happen */
292 printf("internal error - optimization failed: %d\n", r);
297 * Step 10: compute a checksum of the compressed data
299 compressed_checksum = lzo_adler32(0,NULL,0);
300 compressed_checksum = lzo_adler32(compressed_checksum,out,out_len);
303 * Step 11: write compressed data to a file
305 /* Make sure we have up to 2048 bytes of zero after the output */
306 memset(out+out_len, 0, 2048);
308 outfile_len = out_len;
310 soff = get_32(&prefix->pfx_cdatalen);
311 set_32((uint32_t *)(infile+soff), out_len);
313 soff = get_32(&prefix->pfx_checksum);
315 /* ISOLINUX padding and checksumming */
318 outfile_len = ((offset-start+out_len+2047) & ~2047) - (offset-start);
319 for (ptr = 64; ptr < offset; ptr += 4)
320 csum += get_32((uint32_t *)(infile+ptr));
321 for (ptr = 0; ptr < outfile_len; ptr += 4)
322 csum += get_32((uint32_t *)(out+ptr));
324 set_32((uint32_t *)(infile+soff), offset-start+outfile_len);
325 set_32((uint32_t *)(infile+soff+4), csum);
328 f = fopen(out_name,"wb");
331 printf("%s: cannot open output file %s\n", progname, out_name);
334 if (fwrite(infile+start,1,offset-start,f) != offset-start ||
335 fwrite(out,1,outfile_len,f) != outfile_len ||
338 printf("%s: write error !!\n", progname);
343 * Step 12: verify decompression
346 memset(in,0,in_len); /* paranoia - clear output buffer */
348 r = lzo1x_decompress_safe(out,out_len,in,&orig_len,NULL);
349 if (r != LZO_E_OK || orig_len != in_len)
351 /* this should NEVER happen */
352 printf("internal error - decompression failed: %d\n", r);
355 if (uncompressed_checksum != lzo_adler32(lzo_adler32(0,NULL,0),in,in_len))
357 /* this should NEVER happen */
358 printf("internal error - decompression data error\n");
361 /* Now you could also verify decompression under similar conditions as in
362 * your application, e.g. overlapping assembler decompression etc.