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/******************************************************************************
Simple tool to view LZMA header information. Uses liblzmadec.
Copyright (C) 2005 Lasse Collin <lasse.collin@tukaani.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This 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
Lesser General Public License for more details.
******************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#else
extern int errno
#endif
#include "../lzma_version.h"
/* This can be compiled without liblzmadec's stdio support. */
#define LZMADEC_NO_STDIO
#include <lzmadec.h>
/* Extremely simple and limited logarithm function */
static uint_fast32_t
Log2 (uint_fast32_t n)
{
uint_fast32_t e;
for (e = 0; n > 1; e++, n /= 2);
return (e);
}
static int
lzmainfo (FILE *file, const char *name, const char *argv0)
{
lzmadec_info info;
uint8_t buf[LZMADEC_MINIMUM_SIZE];
/* Read the first bytes of the file. */
if (LZMADEC_MINIMUM_SIZE != fread (buf, sizeof (uint8_t),
LZMADEC_MINIMUM_SIZE, file)) {
fprintf (stderr, "%s: %s: Too small to be an LZMA "
"encoded file.\n", argv0, name);
return 1; /* Error */
} else if (LZMADEC_OK != lzmadec_buffer_info (
&info, buf, LZMADEC_MINIMUM_SIZE)) {
fprintf (stderr, "%s: %s: Invalid LZMA header.\n",
argv0, name);
return 1;
} else {
if (file != stdin)
printf ("%s\n", name);
printf ("Uncompressed size: ");
if (info.is_streamed)
printf ("Unknown");
else
printf ("%llu MB (%llu bytes)",
(info.uncompressed_size + 512 * 1024)
/ (1024 * 1024),
info.uncompressed_size);
printf ("\nDictionary size: "
"%u MB (2^%u bytes)\n"
"Literal context bits (lc): %d\n"
"Literal pos bits (lp): %d\n"
"Number of pos bits (pb): %d\n",
(info.dictionary_size + 512 * 1024)
/ (1024 * 1024),
Log2 (info.dictionary_size),
(int)info.lc,
(int)info.lp,
(int)info.pb);
}
fclose (file);
return 0;
}
int
main (int argc, char **argv)
{
FILE *file;
int i;
int ret = 0;
/* Check the command line arguments. */
if (argc < 2) {
/* No arguments, reading standard input. */
ret = lzmainfo (stdin, "(standard input)", argv[0]);
return ret;
} else if (0 == strcmp (argv[1], "--help")) {
printf (/* Breaking the indentation style */
"\nLZMAinfo - Show information stored in the LZMA file header\n\n"
"Usage: lzmainfo [--help | filename.lzma [filename2.lzma ...]]\n\n"
"If no filename is specified lzmainfo reads stdin.\n"
"The information is always printed to stdout.\n\n"
"LZMA SDK version %s - %s\n"
"LZMA utils version %s - %s\n"
"\nLZMAinfo is free software licensed under the GNU LGPL.\n\n",
LZMA_SDK_VERSION_STRING, LZMA_SDK_COPYRIGHT_STRING,
LZMA_UTILS_VERSION_STRING, LZMA_UTILS_COPYRIGHT_STRING);
return 0;
}
/* Show information about files listed on the command line. */
printf ("\n");
for (i = 1; i < argc; i++) {
file = fopen (argv[i], "rb");
if (file == NULL) {
fprintf (stderr, "%s: %s: %s\n", argv[0], argv[i],
strerror (errno));
continue;
}
ret |= lzmainfo (file, argv[i], argv[0]);
printf ("\n");
}
return ret;
}
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