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-rw-r--r--app/lzo/examples/precomp.c330
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diff --git a/app/lzo/examples/precomp.c b/app/lzo/examples/precomp.c
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-/* precomp.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 LZO.FAQ and simple.c first.
-//
-// We will be trying both LZO1X-999 and LZO1Y-999 and choose
-// the algorithm that achieves the best compression ratio.
-**************************************************************************/
-
-#include "lzo/lzoconf.h"
-#include "lzo/lzo1x.h"
-#include "lzo/lzo1y.h"
-
-#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;
-
- 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;
-
- 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
- out_len = out_bufsize;
- r = lzo1x_999_compress(in,in_len,out,&out_len,wrkmem);
- if (r != LZO_E_OK)
- {
- /* this should NEVER happen */
- printf("internal error - compression failed: %d\n", r);
- exit(1);
- }
- printf("LZO1X-999: %8lu -> %8lu\n", (unsigned long) in_len, (unsigned long) out_len);
- if (out_len < best_len)
- {
- best_len = out_len;
- best_compress = 1; /* LZO1X-999 */
- }
-#endif /* USE_LZO1X */
-
-/*
- * Step 6b: compress from 'in' to 'out' with LZO1Y-999
- */
-#ifdef USE_LZO1Y
- out_len = out_bufsize;
- r = lzo1y_999_compress(in,in_len,out,&out_len,wrkmem);
- if (r != LZO_E_OK)
- {
- /* this should NEVER happen */
- printf("internal error - compression failed: %d\n", r);
- exit(1);
- }
- printf("LZO1Y-999: %8lu -> %8lu\n", (unsigned long) in_len, (unsigned long) out_len);
- if (out_len < best_len)
- {
- best_len = out_len;
- 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(in,in_len,out,&out_len,wrkmem);
- else if (best_compress == 2)
- r = lzo1y_999_compress(in,in_len,out,&out_len,wrkmem);
- 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: */
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