/* Copyright (C) 2013 J.F.Dockes
* This program 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.
*
* This program 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 this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "autoconfig.h"
#include <errno.h>
#include <string>
#include <vector>
#include <map>
#include "uncomp.h"
#include "log.h"
#include "smallut.h"
#include "execmd.h"
#include "pathut.h"
using std::map;
using std::string;
using std::vector;
Uncomp::UncompCache Uncomp::o_cache;
Uncomp::Uncomp(bool docache)
: m_docache(docache)
{
LOGDEB0("Uncomp::Uncomp: m_docache: " << m_docache << "\n");
}
bool Uncomp::uncompressfile(const string& ifn,
const vector<string>& cmdv, string& tfile)
{
if (m_docache) {
std::unique_lock<std::mutex> lock(o_cache.m_lock);
if (!o_cache.m_srcpath.compare(ifn)) {
m_dir = o_cache.m_dir;
m_tfile = tfile = o_cache.m_tfile;
m_srcpath = ifn;
o_cache.m_dir = 0;
o_cache.m_srcpath.clear();
return true;
}
}
m_srcpath.clear();
m_tfile.clear();
if (m_dir == 0) {
m_dir = new TempDir;
}
// Make sure tmp dir is empty. we guarantee this to filters
if (!m_dir || !m_dir->ok() || !m_dir->wipe()) {
LOGERR("uncompressfile: can't clear temp dir " << m_dir->dirname() <<
"\n");
return false;
}
// Check that we have enough available space to have some hope of
// decompressing the file.
int pc;
long long availmbs;
if (!fsocc(m_dir->dirname(), &pc, &availmbs)) {
LOGERR("uncompressfile: can't retrieve avail space for " <<
m_dir->dirname() << "\n");
// Hope for the best
} else {
long long fsize = path_filesize(ifn);
if (fsize < 0) {
LOGERR("uncompressfile: stat input file " << ifn << " errno " <<
errno << "\n");
return false;
}
// We need at least twice the file size for the uncompressed
// and compressed versions. Most compressors don't store the
// uncompressed size, so we have no way to be sure that we
// have enough space before trying. We take a little margin
// use same Mb def as fsocc()
long long filembs = fsize / (1024 * 1024);
if (availmbs < 2 * filembs + 1) {
LOGERR("uncompressfile. " << availmbs << " MBs available in " <<
m_dir->dirname() << " not enough to uncompress " <<
ifn << " of size " << filembs << " MBs\n");
return false;
}
}
string cmd = cmdv.front();
// Substitute file name and temp dir in command elements
vector<string>::const_iterator it = cmdv.begin();
++it;
vector<string> args;
map<char, string> subs;
subs['f'] = ifn;
subs['t'] = m_dir->dirname();
for (; it != cmdv.end(); it++) {
string ns;
pcSubst(*it, ns, subs);
args.push_back(ns);
}
// Execute command and retrieve output file name, check that it exists
ExecCmd ex;
int status = ex.doexec(cmd, args, 0, &tfile);
if (status || tfile.empty()) {
LOGERR("uncompressfile: doexec: failed for [" << ifn << "] status 0x" <<
status << "\n");
if (!m_dir->wipe()) {
LOGERR("uncompressfile: wipedir failed\n");
}
return false;
}
if (tfile[tfile.length() - 1] == '\n')
tfile.erase(tfile.length() - 1, 1);
m_tfile = tfile;
m_srcpath = ifn;
return true;
}
Uncomp::~Uncomp()
{
LOGDEB0("Uncomp::~Uncomp: m_docache: " << m_docache << " m_dir " <<
(m_dir?m_dir->dirname():"(null)") << "\n");
if (m_docache) {
std::unique_lock<std::mutex> lock(o_cache.m_lock);
delete o_cache.m_dir;
o_cache.m_dir = m_dir;
o_cache.m_tfile = m_tfile;
o_cache.m_srcpath = m_srcpath;
} else {
delete m_dir;
}
}
void Uncomp::clearcache()
{
LOGDEB0("Uncomp::clearcache\n");
std::unique_lock<std::mutex> lock(o_cache.m_lock);
delete o_cache.m_dir;
o_cache.m_dir = 0;
o_cache.m_tfile.clear();
o_cache.m_srcpath.clear();
}