137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
/* Copyright (C) 2013 J.F.Dockes
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "autoconfig.h"
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#include <errno.h>
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#include <string>
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#include <vector>
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#include <map>
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#include "uncomp.h"
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#include "log.h"
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#include "smallut.h"
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#include "execmd.h"
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#include "pathut.h"
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using std::map;
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using std::string;
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using std::vector;
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Uncomp::UncompCache Uncomp::o_cache;
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bool Uncomp::uncompressfile(const string& ifn,
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const vector<string>& cmdv, string& tfile)
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{
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if (m_docache) {
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std::unique_lock<std::mutex> lock(o_cache.m_lock);
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if (!o_cache.m_srcpath.compare(ifn)) {
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m_dir = o_cache.m_dir;
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m_tfile = tfile = o_cache.m_tfile;
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m_srcpath = ifn;
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o_cache.m_dir = 0;
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o_cache.m_srcpath.clear();
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return true;
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}
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}
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m_srcpath.clear();
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m_tfile.clear();
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if (m_dir == 0) {
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m_dir = new TempDir;
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}
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// Make sure tmp dir is empty. we guarantee this to filters
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if (!m_dir || !m_dir->ok() || !m_dir->wipe()) {
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LOGERR("uncompressfile: can't clear temp dir " << (m_dir->dirname()) << "\n" );
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return false;
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}
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// Check that we have enough available space to have some hope of
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// decompressing the file.
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int pc;
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long long availmbs;
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if (!fsocc(m_dir->dirname(), &pc, &availmbs)) {
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LOGERR("uncompressfile: can't retrieve avail space for " << (m_dir->dirname()) << "\n" );
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// Hope for the best
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} else {
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long long fsize = path_filesize(ifn);
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if (fsize < 0) {
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LOGERR("uncompressfile: stat input file " << (ifn) << " errno " << (errno) << "\n" );
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return false;
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}
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// We need at least twice the file size for the uncompressed
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// and compressed versions. Most compressors don't store the
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// uncompressed size, so we have no way to be sure that we
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// have enough space before trying. We take a little margin
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// use same Mb def as fsocc()
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long long filembs = fsize / (1024 * 1024);
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if (availmbs < 2 * filembs + 1) {
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LOGERR("uncompressfile. " << (lltodecstr(availmbs)) << " MBs available in " << (m_dir->dirname()) << " not enough to uncompress " << (ifn) << " of size " << (lltodecstr(filembs)) << " mbs\n" );
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return false;
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}
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}
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string cmd = cmdv.front();
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// Substitute file name and temp dir in command elements
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vector<string>::const_iterator it = cmdv.begin();
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++it;
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vector<string> args;
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map<char, string> subs;
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subs['f'] = ifn;
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subs['t'] = m_dir->dirname();
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for (; it != cmdv.end(); it++) {
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string ns;
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pcSubst(*it, ns, subs);
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args.push_back(ns);
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}
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// Execute command and retrieve output file name, check that it exists
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ExecCmd ex;
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int status = ex.doexec(cmd, args, 0, &tfile);
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if (status || tfile.empty()) {
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LOGERR("uncompressfile: doexec: failed for [" << (ifn) << "] status 0x" << (status) << "\n" );
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if (!m_dir->wipe()) {
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LOGERR("uncompressfile: wipedir failed\n" );
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}
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return false;
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}
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if (tfile[tfile.length() - 1] == '\n')
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tfile.erase(tfile.length() - 1, 1);
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m_tfile = tfile;
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m_srcpath = ifn;
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return true;
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}
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Uncomp::~Uncomp()
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{
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if (m_docache) {
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std::unique_lock<std::mutex> lock(o_cache.m_lock);
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delete o_cache.m_dir;
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o_cache.m_dir = m_dir;
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o_cache.m_tfile = m_tfile;
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o_cache.m_srcpath = m_srcpath;
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} else {
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delete m_dir;
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}
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}
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