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/*
* compression.c: code to find decompressor / compression extension
*
* Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
* Copyright (C) 2001-2022 Colin Watson.
*
* This file is part of man-db.
*
* man-db 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.
*
* man-db 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 man-db; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Sat Aug 20 15:01:02 BST 1994 Wilf. (G.Wilford@ee.surrey.ac.uk)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "error.h"
#include "xstrndup.h"
#include "xvasprintf.h"
#include "manconfig.h"
#include "appendstr.h"
#include "compression.h"
/*--------------------------------------------------------------------------*/
/* This is where we define the decompressors used to decompress any nroff */
/* source that we find. All cat pages are compressed with either gzip (if */
/* available) or compress. This is not the place to define _the_ cat page */
/* decompressor - see ./manconfig.h for that. */
/* */
/* To add a decompressor all you need to know is its name (preferably its */
/* location), and the unique extension that it gives to files compressed */
/* with it. Here is an example. You have a compressor named foobar and */
/* compressed files have an extension of .fb . It is located in /usr/bin */
/* and requires a -d option to be used as a decompressor. Add the following */
/* line to the structure below. */
/* */
/* {"/usr/bin/foobar -d", "fb", NULL}, */
/*--------------------------------------------------------------------------*/
struct compression comp_list[] = {
/* If we have gzip, incorporate the following */
#ifdef HAVE_GZIP
{PROG_GUNZIP, "gz", NULL},
{PROG_GUNZIP, "z", NULL},
#endif /* HAVE_GZIP */
/* If we have compress, incorporate the following */
#ifdef HAVE_COMPRESS
{PROG_UNCOMPRESS, "Z", NULL},
/* Else if we have gzip, incorporate the following */
#elif defined(HAVE_GZIP)
{PROG_GUNZIP, "Z", NULL},
#endif /* HAVE_COMPRESS || HAVE_GZIP */
/* If we have bzip2, incorporate the following */
#ifdef HAVE_BZIP2
{PROG_BUNZIP2, "bz2", NULL},
#endif /* HAVE_BZIP2 */
/* If we have xz, incorporate the following */
#ifdef HAVE_XZ
{PROG_UNXZ, "xz", NULL},
{PROG_UNXZ, "lzma", NULL},
/* Else if we have lzma, incorporate the following */
#elif defined(HAVE_LZMA)
{PROG_UNLZMA, "lzma", NULL},
#endif /* HAVE_XZ || HAVE_LZMA */
/* If we have lzip, incorporate the following */
#ifdef HAVE_LZIP
{PROG_UNLZIP, "lz", NULL},
#endif /* HAVE_LZIP */
/* If we have zstd, incorporate the following */
#ifdef HAVE_ZSTD
{PROG_UNZSTD, "zst", NULL},
{PROG_UNZSTD, "zstd", NULL},
#endif /* HAVE_ZSTD */
/*------------------------------------------------------*/
/* Add your decompressor(s) and extension(s) below here */
/*------------------------------------------------------*/
/*----------------*/
/* and above here */
/*----------------*/
/* ... and the last structure is */
{NULL, NULL, NULL}
};
/* Take filename as arg, return structure containing decompressor
and extension, or NULL if no comp extension found.
If want_stem, set comp->stem to the filename without extension, which
the caller should free.
eg.
filename = /usr/man/man1/foo.1.gz
comp->prog = "/usr/bin/gzip -dc";
comp->ext = "gz";
comp->stem = "/usr/man/man1/foo.1";
*/
struct compression *comp_info (const char *filename, bool want_stem)
{
const char *ext;
static struct compression hpux_comp = {PROG_GUNZIP " -S \"\"", "",
NULL};
ext = strrchr (filename, '.');
if (ext) {
struct compression *comp;
for (comp = comp_list; comp->ext; comp++) {
if (strcmp (comp->ext, ext + 1) == 0) {
if (want_stem)
comp->stem = xstrndup (filename,
ext - filename);
else
comp->stem = NULL;
return comp;
}
}
}
if (*PROG_GUNZIP) {
ext = strstr (filename, ".Z/");
if (ext) {
if (want_stem)
hpux_comp.stem =
xstrndup (filename, ext - filename);
else
hpux_comp.stem = NULL;
return &hpux_comp;
}
}
return NULL;
}
/* take filename w/o comp ext. as arg, return comp->stem as a relative
compressed file or NULL if none found */
struct compression *comp_file (const char *filename)
{
size_t len;
char *compfile;
struct compression *comp;
compfile = xasprintf ("%s.", filename);
assert (compfile);
len = strlen (compfile);
for (comp = comp_list; comp->ext; comp++) {
struct stat buf;
compfile = appendstr (compfile, comp->ext, nullptr);
if (stat (compfile, &buf) == 0) {
comp->stem = compfile;
return comp;
}
*(compfile + len) = '\0';
}
free (compfile);
return NULL;
}
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