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///////////////////////////////////////////////////////////////////////////////
//
/// \file lzmainfo.c
/// \brief lzmainfo tool for compatibility with LZMA Utils
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "sysdefs.h"
#include <stdio.h>
#include <errno.h>
#include "lzma.h"
#include "getopt.h"
#include "tuklib_gettext.h"
#include "tuklib_progname.h"
#include "tuklib_exit.h"
#ifdef TUKLIB_DOSLIKE
# include <fcntl.h>
# include <io.h>
#endif
static void lzma_attribute((noreturn))
help(void)
{
printf(
_("Usage: %s [--help] [--version] [FILE]...\n"
"Show information stored in the .lzma file header"), progname);
printf(_(
"\nWith no FILE, or when FILE is -, read standard input.\n"));
printf("\n");
printf(_("Report bugs to <%s> (in English or Finnish).\n"),
PACKAGE_BUGREPORT);
printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
tuklib_exit(EXIT_SUCCESS, EXIT_FAILURE, true);
}
static void lzma_attribute((noreturn))
version(void)
{
puts("lzmainfo (" PACKAGE_NAME ") " LZMA_VERSION_STRING);
tuklib_exit(EXIT_SUCCESS, EXIT_FAILURE, true);
}
/// Parse command line options.
static void
parse_args(int argc, char **argv)
{
enum {
OPT_HELP,
OPT_VERSION,
};
static const struct option long_opts[] = {
{ "help", no_argument, NULL, OPT_HELP },
{ "version", no_argument, NULL, OPT_VERSION },
{ NULL, 0, NULL, 0 }
};
int c;
while ((c = getopt_long(argc, argv, "", long_opts, NULL)) != -1) {
switch (c) {
case OPT_HELP:
help();
case OPT_VERSION:
version();
default:
exit(EXIT_FAILURE);
}
}
return;
}
/// Primitive base-2 logarithm for integers
static uint32_t
my_log2(uint32_t n)
{
uint32_t e;
for (e = 0; n > 1; ++e, n /= 2) ;
return e;
}
/// Parse the .lzma header and display information about it.
static bool
lzmainfo(const char *name, FILE *f)
{
uint8_t buf[13];
const size_t size = fread(buf, 1, sizeof(buf), f);
if (size != 13) {
fprintf(stderr, "%s: %s: %s\n", progname, name,
ferror(f) ? strerror(errno)
: _("File is too small to be a .lzma file"));
return true;
}
lzma_filter filter = { .id = LZMA_FILTER_LZMA1 };
// Parse the first five bytes.
switch (lzma_properties_decode(&filter, NULL, buf, 5)) {
case LZMA_OK:
break;
case LZMA_OPTIONS_ERROR:
fprintf(stderr, "%s: %s: %s\n", progname, name,
_("Not a .lzma file"));
return true;
case LZMA_MEM_ERROR:
fprintf(stderr, "%s: %s\n", progname, strerror(ENOMEM));
exit(EXIT_FAILURE);
default:
fprintf(stderr, "%s: %s\n", progname,
_("Internal error (bug)"));
exit(EXIT_FAILURE);
}
// Uncompressed size
uint64_t uncompressed_size = 0;
for (size_t i = 0; i < 8; ++i)
uncompressed_size |= (uint64_t)(buf[5 + i]) << (i * 8);
// Display the results. We don't want to translate these and also
// will use MB instead of MiB, because someone could be parsing
// this output and we don't want to break that when people move
// from LZMA Utils to XZ Utils.
if (f != stdin)
printf("%s\n", name);
printf("Uncompressed size: ");
if (uncompressed_size == UINT64_MAX)
printf("Unknown");
else
printf("%" PRIu64 " MB (%" PRIu64 " bytes)",
(uncompressed_size + 512 * 1024)
/ (1024 * 1024),
uncompressed_size);
lzma_options_lzma *opt = filter.options;
printf("\nDictionary size: "
"%u MB (2^%u bytes)\n"
"Literal context bits (lc): %" PRIu32 "\n"
"Literal pos bits (lp): %" PRIu32 "\n"
"Number of pos bits (pb): %" PRIu32 "\n",
(opt->dict_size + 512 * 1024) / (1024 * 1024),
my_log2(opt->dict_size), opt->lc, opt->lp, opt->pb);
free(opt);
return false;
}
extern int
main(int argc, char **argv)
{
tuklib_progname_init(argv);
tuklib_gettext_init(PACKAGE, LOCALEDIR);
parse_args(argc, argv);
#ifdef TUKLIB_DOSLIKE
setmode(STDIN_FILENO, O_BINARY);
#endif
int ret = EXIT_SUCCESS;
// We print empty lines around the output only when reading from
// files specified on the command line. This is due to how
// LZMA Utils did it.
if (optind == argc) {
if (lzmainfo("(stdin)", stdin))
ret = EXIT_FAILURE;
} else {
printf("\n");
do {
if (strcmp(argv[optind], "-") == 0) {
if (lzmainfo("(stdin)", stdin))
ret = EXIT_FAILURE;
} else {
FILE *f = fopen(argv[optind], "r");
if (f == NULL) {
ret = EXIT_FAILURE;
fprintf(stderr, "%s: %s: %s\n",
progname,
argv[optind],
strerror(errno));
continue;
}
if (lzmainfo(argv[optind], f))
ret = EXIT_FAILURE;
printf("\n");
fclose(f);
}
} while (++optind < argc);
}
tuklib_exit(ret, EXIT_FAILURE, true);
}
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