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/*
* decompress.c: decompression abstraction layer
*
* Copyright (C) 2007, 2008 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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef HAVE_LIBZ
# include "zlib.h"
#endif /* HAVE_LIBZ */
#include "xvasprintf.h"
#include "manconfig.h"
#include "comp_src.h"
#include "pipeline.h"
#include "decompress.h"
#ifdef HAVE_LIBZ
static void decompress_zlib (void *data ATTRIBUTE_UNUSED)
{
gzFile zlibfile;
zlibfile = gzdopen (dup (STDIN_FILENO), "r");
if (!zlibfile)
return;
for (;;) {
char buffer[4096];
int r = gzread (zlibfile, buffer, 4096);
if (r <= 0)
break;
if (fwrite (buffer, 1, (size_t) r, stdout) < (size_t) r)
break;
}
gzclose (zlibfile);
return;
}
#endif /* HAVE_LIBZ */
pipeline *decompress_open (const char *filename)
{
pipecmd *cmd;
pipeline *p;
struct stat st;
#ifdef HAVE_LIBZ
size_t filename_len;
#endif /* HAVE_LIBZ */
char *ext;
struct compression *comp;
if (stat (filename, &st) < 0 || S_ISDIR (st.st_mode))
return NULL;
#ifdef HAVE_LIBZ
filename_len = strlen (filename);
if (filename_len > 3 && STREQ (filename + filename_len - 3, ".gz")) {
/* informational only; no shell quoting concerns */
char *name = xasprintf ("zcat < %s", filename);
cmd = pipecmd_new_function (name, &decompress_zlib, NULL,
NULL);
free (name);
p = pipeline_new_commands (cmd, NULL);
goto got_pipeline;
}
#endif /* HAVE_LIBZ */
ext = strrchr (filename, '.');
if (ext) {
++ext;
for (comp = comp_list; comp->ext; ++comp) {
if (!STREQ (comp->ext, ext))
continue;
cmd = pipecmd_new_argstr (comp->prog);
pipecmd_arg (cmd, filename);
p = pipeline_new_commands (cmd, NULL);
goto got_pipeline;
}
}
#ifdef HAVE_GZIP
/* HP-UX */
ext = strstr (filename, ".Z/");
if (ext) {
cmd = pipecmd_new_argstr (GUNZIP " -S \"\"");
pipecmd_arg (cmd, filename);
p = pipeline_new_commands (cmd, NULL);
goto got_pipeline;
}
#endif
p = pipeline_new ();
got_pipeline:
pipeline_want_infile (p, filename);
pipeline_want_out (p, -1);
return p;
}
pipeline *decompress_fdopen (int fd)
{
pipeline *p;
#ifdef HAVE_LIBZ
pipecmd *cmd;
#endif /* HAVE_LIBZ */
#ifdef HAVE_LIBZ
cmd = pipecmd_new_function ("zcat", &decompress_zlib, NULL, NULL);
p = pipeline_new_commands (cmd, NULL);
#else /* HAVE_LIBZ */
p = pipeline_new ();
#endif /* HAVE_LIBZ */
pipeline_want_in (p, fd);
pipeline_want_out (p, -1);
return p;
}
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