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Diffstat (limited to 'app/lzo/examples/precomp2.c')
| -rw-r--r-- | app/lzo/examples/precomp2.c | 382 |
1 files changed, 0 insertions, 382 deletions
diff --git a/app/lzo/examples/precomp2.c b/app/lzo/examples/precomp2.c deleted file mode 100644 index 93dd8b55..00000000 --- a/app/lzo/examples/precomp2.c +++ /dev/null @@ -1,382 +0,0 @@ -/* precomp2.c -- example program: how to generate pre-compressed data - - This file is part of the LZO real-time data compression library. - - Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer - All Rights Reserved. - - The LZO library is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2 of - the License, or (at your option) any later version. - - The LZO library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with the LZO library; see the file COPYING. - If not, write to the Free Software Foundation, Inc., - 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - - Markus F.X.J. Oberhumer - <markus@oberhumer.com> - http://www.oberhumer.com/opensource/lzo/ - */ - - -/************************************************************************* -// This program shows how to generate pre-compressed data. -// -// Please study precomp.c first. -// -// We will be trying LZO1X-999 and LZO1Y-999, and we will be trying -// various parameters using the internal interface to squeeze out -// a little bit of extra compression. -// -// NOTE: this program can be quite slow for highly redundant files -**************************************************************************/ - -#include "lzo/lzoconf.h" -#include "lzo/lzo1x.h" -#include "lzo/lzo1y.h" - -LZO_EXTERN(int) -lzo1x_999_compress_internal ( const lzo_bytep in , lzo_uint in_len, - lzo_bytep out, lzo_uintp out_len, - lzo_voidp wrkmem, - const lzo_bytep dict, lzo_uint dict_len, - lzo_callback_p cb, - int try_lazy, - lzo_uint good_length, - lzo_uint max_lazy, - lzo_uint nice_length, - lzo_uint max_chain, - lzo_uint32_t flags ); - -LZO_EXTERN(int) -lzo1y_999_compress_internal ( const lzo_bytep in , lzo_uint in_len, - lzo_bytep out, lzo_uintp out_len, - lzo_voidp wrkmem, - const lzo_bytep dict, lzo_uint dict_len, - lzo_callback_p cb, - int try_lazy, - lzo_uint good_length, - lzo_uint max_lazy, - lzo_uint nice_length, - lzo_uint max_chain, - lzo_uint32_t flags ); - -#define USE_LZO1X 1 -#define USE_LZO1Y 1 - -#define PARANOID 1 - - -/* portability layer */ -static const char *progname = NULL; -#define WANT_LZO_MALLOC 1 -#define WANT_LZO_FREAD 1 -#define WANT_LZO_WILDARGV 1 -#define WANT_XMALLOC 1 -#include "examples/portab.h" - - -/************************************************************************* -// -**************************************************************************/ - -int __lzo_cdecl_main main(int argc, char *argv[]) -{ - int r; - int lazy; - const int max_try_lazy = 5; - const lzo_uint big = 65536L; /* can result in very slow compression */ - const lzo_uint32_t flags = 0x1; - - lzo_bytep in; - lzo_uint in_len; - - lzo_bytep out; - lzo_uint out_bufsize; - lzo_uint out_len = 0; - - lzo_voidp wrkmem; - lzo_uint wrkmem_size; - - lzo_uint best_len; - int best_compress = -1; - int best_lazy = -1; - - lzo_uint orig_len; - lzo_uint32_t uncompressed_checksum; - lzo_uint32_t compressed_checksum; - - FILE *fp; - const char *in_name = NULL; - const char *out_name = NULL; - long l; - - - lzo_wildargv(&argc, &argv); - - printf("\nLZO real-time data compression library (v%s, %s).\n", - lzo_version_string(), lzo_version_date()); - printf("Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n"); - - progname = argv[0]; - if (argc < 2 || argc > 3) - { - printf("usage: %s file [output-file]\n", progname); - exit(1); - } - in_name = argv[1]; - if (argc > 2) out_name = argv[2]; - -/* - * Step 1: initialize the LZO library - */ - if (lzo_init() != LZO_E_OK) - { - printf("internal error - lzo_init() failed !!!\n"); - printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable '-DLZO_DEBUG' for diagnostics)\n"); - exit(1); - } - -/* - * Step 2: allocate the work-memory - */ - wrkmem_size = 1; -#ifdef USE_LZO1X - wrkmem_size = (LZO1X_999_MEM_COMPRESS > wrkmem_size) ? LZO1X_999_MEM_COMPRESS : wrkmem_size; -#endif -#ifdef USE_LZO1Y - wrkmem_size = (LZO1Y_999_MEM_COMPRESS > wrkmem_size) ? LZO1Y_999_MEM_COMPRESS : wrkmem_size; -#endif - wrkmem = (lzo_voidp) xmalloc(wrkmem_size); - if (wrkmem == NULL) - { - printf("%s: out of memory\n", progname); - exit(1); - } - -/* - * Step 3: open the input file - */ - fp = fopen(in_name,"rb"); - if (fp == NULL) - { - printf("%s: cannot open file %s\n", progname, in_name); - exit(1); - } - fseek(fp, 0, SEEK_END); - l = ftell(fp); - fseek(fp, 0, SEEK_SET); - if (l <= 0) - { - printf("%s: %s: empty file\n", progname, in_name); - fclose(fp); fp = NULL; - exit(1); - } - in_len = (lzo_uint) l; - out_bufsize = in_len + in_len / 16 + 64 + 3; - best_len = in_len; - -/* - * Step 4: allocate compression buffers and read the file - */ - in = (lzo_bytep) xmalloc(in_len); - out = (lzo_bytep) xmalloc(out_bufsize); - if (in == NULL || out == NULL) - { - printf("%s: out of memory\n", progname); - exit(1); - } - in_len = (lzo_uint) lzo_fread(fp, in, in_len); - printf("%s: loaded file %s: %ld bytes\n", progname, in_name, (long) in_len); - fclose(fp); fp = NULL; - -/* - * Step 5: compute a checksum of the uncompressed data - */ - uncompressed_checksum = lzo_adler32(0,NULL,0); - uncompressed_checksum = lzo_adler32(uncompressed_checksum,in,in_len); - -/* - * Step 6a: compress from 'in' to 'out' with LZO1X-999 - */ -#ifdef USE_LZO1X - for (lazy = 0; lazy <= max_try_lazy; lazy++) - { - out_len = out_bufsize; - r = lzo1x_999_compress_internal(in,in_len,out,&out_len,wrkmem, - NULL, 0, 0, - lazy, big, big, big, big, flags); - if (r != LZO_E_OK) - { - /* this should NEVER happen */ - printf("internal error - compression failed: %d\n", r); - exit(1); - } - printf("LZO1X-999: lazy =%2d: %8lu -> %8lu\n", - lazy, (unsigned long) in_len, (unsigned long) out_len); - if (out_len < best_len) - { - best_len = out_len; - best_lazy = lazy; - best_compress = 1; /* LZO1X-999 */ - } - } -#endif /* USE_LZO1X */ - -/* - * Step 6b: compress from 'in' to 'out' with LZO1Y-999 - */ -#ifdef USE_LZO1Y - for (lazy = 0; lazy <= max_try_lazy; lazy++) - { - out_len = out_bufsize; - r = lzo1y_999_compress_internal(in,in_len,out,&out_len,wrkmem, - NULL, 0, 0, - lazy, big, big, big, big, flags); - if (r != LZO_E_OK) - { - /* this should NEVER happen */ - printf("internal error - compression failed: %d\n", r); - exit(1); - } - printf("LZO1Y-999: lazy =%2d: %8lu -> %8lu\n", - lazy, (unsigned long) in_len, (unsigned long) out_len); - if (out_len < best_len) - { - best_len = out_len; - best_lazy = lazy; - best_compress = 2; /* LZO1Y-999 */ - } - } -#endif /* USE_LZO1Y */ - -/* - * Step 7: check if compressible - */ - if (best_len >= in_len) - { - printf("This file contains incompressible data.\n"); - return 0; - } - -/* - * Step 8: compress data again using the best compressor found - */ - out_len = out_bufsize; - if (best_compress == 1) - r = lzo1x_999_compress_internal(in,in_len,out,&out_len,wrkmem, - NULL, 0, 0, - best_lazy, big, big, big, big, flags); - else if (best_compress == 2) - r = lzo1y_999_compress_internal(in,in_len,out,&out_len,wrkmem, - NULL, 0, 0, - best_lazy, big, big, big, big, flags); - else - r = -100; - assert(r == LZO_E_OK); - assert(out_len == best_len); - -/* - * Step 9: optimize compressed data (compressed data is in 'out' buffer) - */ -#if 1 - /* Optimization does not require any data in the buffer that will - * hold the uncompressed data. To prove this, we clear the buffer. - */ - lzo_memset(in,0,in_len); -#endif - - orig_len = in_len; - r = -100; -#ifdef USE_LZO1X - if (best_compress == 1) - r = lzo1x_optimize(out,out_len,in,&orig_len,NULL); -#endif -#ifdef USE_LZO1Y - if (best_compress == 2) - r = lzo1y_optimize(out,out_len,in,&orig_len,NULL); -#endif - if (r != LZO_E_OK || orig_len != in_len) - { - /* this should NEVER happen */ - printf("internal error - optimization failed: %d\n", r); - exit(1); - } - -/* - * Step 10: compute a checksum of the compressed data - */ - compressed_checksum = lzo_adler32(0,NULL,0); - compressed_checksum = lzo_adler32(compressed_checksum,out,out_len); - -/* - * Step 11: write compressed data to a file - */ - printf("%s: %s: %ld -> %ld, checksum 0x%08lx 0x%08lx\n", - progname, in_name, (long) in_len, (long) out_len, - (long) uncompressed_checksum, (long) compressed_checksum); - - if (out_name && out_name[0]) - { - printf("%s: writing to file %s\n", progname, out_name); - fp = fopen(out_name,"wb"); - if (fp == NULL) - { - printf("%s: cannot open output file %s\n", progname, out_name); - exit(1); - } - if (lzo_fwrite(fp, out, out_len) != out_len || fclose(fp) != 0) - { - printf("%s: write error !!\n", progname); - exit(1); - } - } - -/* - * Step 12: verify decompression - */ -#ifdef PARANOID - lzo_memset(in,0,in_len); /* paranoia - clear output buffer */ - orig_len = in_len; - r = -100; -#ifdef USE_LZO1X - if (best_compress == 1) - r = lzo1x_decompress_safe(out,out_len,in,&orig_len,NULL); -#endif -#ifdef USE_LZO1Y - if (best_compress == 2) - r = lzo1y_decompress_safe(out,out_len,in,&orig_len,NULL); -#endif - if (r != LZO_E_OK || orig_len != in_len) - { - /* this should NEVER happen */ - printf("internal error - decompression failed: %d\n", r); - exit(1); - } - if (uncompressed_checksum != lzo_adler32(lzo_adler32(0,NULL,0),in,in_len)) - { - /* this should NEVER happen */ - printf("internal error - decompression data error\n"); - exit(1); - } - /* Now you could also verify decompression under similar conditions as in - * your application, e.g. overlapping assembler decompression etc. - */ -#endif - - lzo_free(in); - lzo_free(out); - lzo_free(wrkmem); - - return 0; -} - - -/* vim:set ts=4 sw=4 et: */ |