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+/* dict.c -- example program: how to use preset dictionaries
+
+ This file is part of the LZO real-time data compression library.
+
+ Copyright (C) 1996-2017 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 use preset dictionaries.
+//
+// Please study LZO.FAQ and simple.c first.
+**************************************************************************/
+
+#include <lzo/lzoconf.h>
+#include <lzo/lzo1x.h>
+
+/* 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"
+
+
+#define DICT_LEN 0xbfff
+static lzo_bytep dict;
+static lzo_uint dict_len = 0;
+static lzo_uint32_t dict_adler32;
+
+
+/*************************************************************************
+//
+**************************************************************************/
+
+static lzo_uint total_n = 0;
+static lzo_uint total_c_len = 0;
+static lzo_uint total_d_len = 0;
+
+static void print_info(const char *name, lzo_uint d_len, lzo_uint c_len)
+{
+ double perc;
+
+ perc = (d_len > 0) ? c_len * 100.0 / d_len : 0.0;
+ printf(" | %-30s %9ld -> %9ld %7.2f%% |\n",
+ name, (long) d_len, (long) c_len, perc);
+
+ total_n++;
+ total_c_len += c_len;
+ total_d_len += d_len;
+}
+
+
+/*************************************************************************
+//
+**************************************************************************/
+
+static int do_file(const char *in_name, int compression_level)
+{
+ int r;
+ lzo_bytep in;
+ lzo_bytep out;
+ lzo_bytep newb;
+ lzo_voidp wrkmem;
+ lzo_uint in_len;
+ lzo_uint out_len;
+ lzo_uint new_len;
+ long l;
+ FILE *fp;
+
+/*
+ * Step 1: open the input file
+ */
+ fp = fopen(in_name,"rb");
+ if (fp == NULL)
+ {
+ printf("%s: %s: cannot open file\n", progname, in_name);
+ return 0; /* no error */
+ }
+ fseek(fp, 0, SEEK_END);
+ l = ftell(fp);
+ fseek(fp, 0, SEEK_SET);
+ if (l <= 0)
+ {
+ printf("%s: %s: empty file -- skipping\n", progname, in_name);
+ fclose(fp); fp = NULL;
+ return 0; /* no error */
+ }
+ in_len = (lzo_uint) l;
+ if ((long) in_len != l || l > 256L * 1024L * 1024L)
+ {
+ printf("%s: %s: file is too big -- skipping\n", progname, in_name);
+ fclose(fp); fp = NULL;
+ return 0; /* no error */
+ }
+
+/*
+ * Step 2: allocate compression buffers and read the file
+ */
+ in = (lzo_bytep) xmalloc(in_len);
+ out = (lzo_bytep) xmalloc(in_len + in_len / 16 + 64 + 3);
+ newb = (lzo_bytep) xmalloc(in_len);
+ wrkmem = (lzo_voidp) xmalloc(LZO1X_999_MEM_COMPRESS);
+ if (in == NULL || out == NULL || newb == NULL || wrkmem == NULL)
+ {
+ printf("%s: out of memory\n", progname);
+ exit(1);
+ }
+ in_len = (lzo_uint) lzo_fread(fp, in, in_len);
+ fclose(fp); fp = NULL;
+
+/*
+ * Step 3: compress from 'in' to 'out' with LZO1X-999
+ */
+ r = lzo1x_999_compress_level(in, in_len, out, &out_len, wrkmem,
+ dict, dict_len, 0, compression_level);
+ if (r != LZO_E_OK)
+ {
+ /* this should NEVER happen */
+ printf("internal error - compression failed: %d\n", r);
+ return 1;
+ }
+
+ print_info(in_name, in_len, out_len);
+
+/*
+ * Step 4: decompress again, now going from 'out' to 'newb'
+ */
+ new_len = in_len;
+ r = lzo1x_decompress_dict_safe(out, out_len, newb, &new_len, NULL, dict, dict_len);
+ if (r != LZO_E_OK)
+ {
+ /* this should NEVER happen */
+ printf("internal error - decompression failed: %d\n", r);
+ return 1;
+ }
+
+/*
+ * Step 5: verify decompression
+ */
+ if (new_len != in_len || lzo_memcmp(in, newb, in_len) != 0)
+ {
+ /* this should NEVER happen */
+ printf("internal error - decompression data error\n");
+ return 1;
+ }
+
+ /* free buffers in reverse order to help malloc() */
+ lzo_free(wrkmem);
+ lzo_free(newb);
+ lzo_free(out);
+ lzo_free(in);
+ return 0;
+}
+
+
+/*************************************************************************
+//
+**************************************************************************/
+
+int __lzo_cdecl_main main(int argc, char *argv[])
+{
+ int i = 1;
+ int r = 0;
+ const char *dict_name;
+ FILE *fp;
+ time_t t_total;
+ int compression_level = 7;
+
+ lzo_wildargv(&argc, &argv);
+
+ printf("\nLZO real-time data compression library (v%s, %s).\n",
+ lzo_version_string(), lzo_version_date());
+ printf("Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n");
+
+ progname = argv[0];
+
+ if (i < argc && argv[i][0] == '-' && isdigit(argv[i][1]))
+ compression_level = atoi(&argv[i++][1]);
+
+ if (i + 1 >= argc || compression_level < 1 || compression_level > 9)
+ {
+ printf("usage: %s [-level] [ dictionary-file | -n ] file...\n", progname);
+ exit(1);
+ }
+ printf("Compression level is LZO1X-999/%d\n", compression_level);
+
+/*
+ * 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: prepare the dictionary
+ */
+ dict = (lzo_bytep) xmalloc(DICT_LEN);
+ if (dict == NULL)
+ {
+ printf("%s: out of memory\n", progname);
+ exit(1);
+ }
+ dict_name = argv[i++];
+ if (strcmp(dict_name,"-n") == 0)
+ {
+ dict_name = "empty";
+ dict_len = 0;
+ }
+ else
+ {
+ fp = fopen(dict_name,"rb");
+ if (fp == NULL)
+ {
+ printf("%s: cannot open dictionary file %s\n", progname, dict_name);
+ exit(1);
+ }
+ dict_len = (lzo_uint) lzo_fread(fp, dict, DICT_LEN);
+ fclose(fp); fp = NULL;
+ }
+
+ dict_adler32 = lzo_adler32(0, NULL, 0);
+ dict_adler32 = lzo_adler32(dict_adler32, dict, dict_len);
+ printf("Using dictionary '%s', %ld bytes, ID 0x%08lx.\n",
+ dict_name, (long) dict_len, (unsigned long) dict_adler32);
+
+/*
+ * Step 3: process files
+ */
+ t_total = time(NULL);
+ for ( ; i < argc; i++) {
+ if (do_file(argv[i], compression_level) != 0) {
+ r = 1;
+ break;
+ }
+ }
+ t_total = time(NULL) - t_total;
+
+ lzo_free(dict);
+
+ if (total_n > 1)
+ print_info("***TOTALS***", total_d_len, total_c_len);
+
+ printf("Dictionary compression test %s, execution time %lu seconds.\n",
+ r == 0 ? "passed" : "FAILED", (unsigned long) t_total);
+ return r;
+}
+
+
+/* vim:set ts=4 sw=4 et: */
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