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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>
#ifdef ENABLE_NLS
# include <libintl.h>
# define _(msgid) gettext(msgid)
#else
# define _(msgid) msgid
#endif
#include "lzma.h"
#include "getopt.h"
/// Name of the program from argv[0]
static const char *argv0;
/// Close stdout unless we are already going to exit with EXIT_FAILURE.
/// If closing stdout fails, set exit status to EXIT_FAILURE and print
/// an error message to stderr. We don't care about closing stderr,
/// because we don't print anything to stderr unless we are going to
/// use EXIT_FAILURE anyway.
static void lzma_attribute((noreturn))
my_exit(int status)
{
if (status != EXIT_FAILURE) {
const int ferror_err = ferror(stdout);
const int fclose_err = fclose(stdout);
if (ferror_err || fclose_err) {
// If it was fclose() that failed, we have the reason
// in errno. If only ferror() indicated an error,
// we have no idea what the reason was.
fprintf(stderr, "%s: %s: %s\n", argv0,
_("Writing to standard output "
"failed"),
fclose_err ? strerror(errno)
: _("Unknown error"));
status = EXIT_FAILURE;
}
}
exit(status);
}
static void lzma_attribute((noreturn))
help(void)
{
printf(
_("Usage: %s [--help] [--version] [FILE]...\n"
"Show information stored in the .lzma file header"), argv0);
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_HOMEPAGE);
my_exit(EXIT_SUCCESS);
}
static void lzma_attribute((noreturn))
version(void)
{
puts("lzmainfo (" PACKAGE_NAME ") " PACKAGE_VERSION);
my_exit(EXIT_SUCCESS);
}
/// 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", argv0, 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", argv0, name,
_("Not a .lzma file"));
return true;
case LZMA_MEM_ERROR:
fprintf(stderr, "%s: %s\n", argv0, strerror(ENOMEM));
exit(EXIT_FAILURE);
default:
fprintf(stderr, "%s: %s\n", argv0, _("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)
{
int ret = EXIT_SUCCESS;
argv0 = argv[0];
parse_args(argc, argv);
// 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) {
lzmainfo("(stdin)", stdin);
} 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",
argv0, argv[optind],
strerror(errno));
continue;
}
if (lzmainfo(argv[optind], f))
ret = EXIT_FAILURE;
printf("\n");
fclose(f);
}
} while (++optind < argc);
}
my_exit(ret);
}
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