1 files changed, 86 insertions, 0 deletions
diff --git a/zcmpdiff.cc b/zcmpdiff.cc
new file mode 100644
index 0000000..6212314
--- /dev/null
+++ b/zcmpdiff.cc
@@ -0,0 +1,86 @@
+/*  Common code for Zcmp and Zdiff
+    Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef O_BINARY
+const int o_binary = O_BINARY;
+#else
+const int o_binary = 0;
+#endif
+
+struct { const char * from; const char * to; } const known_extensions[] = {
+  { ".bz2",  ""     },
+  { ".tbz",  ".tar" },
+  { ".tbz2", ".tar" },
+  { ".gz",   ""     },
+  { ".tgz",  ".tar" },
+  { ".lz",   ""     },
+  { ".tlz",  ".tar" },
+  { ".xz",   ""     },
+  { ".txz",  ".tar" },
+  { 0,       0      } };
+
+
+int open_instream( const std::string & input_filename )
+  {
+  int infd = open( input_filename.c_str(), O_RDONLY | o_binary );
+  if( infd < 0 )
+    show_error2( "Can't open input file", input_filename.c_str() );
+  return infd;
+  }
+
+
+int open_other_instream( std::string & name )
+  {
+  for( int i = 0; known_extensions[i].from; ++i )
+    {					// search uncompressed version
+    const std::string from( known_extensions[i].from );
+    if( name.size() > from.size() &&
+        name.compare( name.size() - from.size(), from.size(), from ) == 0 )
+      {
+      name.resize( name.size() - from.size() );
+      name += known_extensions[i].to;
+      return open( name.c_str(), O_RDONLY | o_binary );
+      }
+    }
+  for( int i = 0; i < num_formats; ++i )
+    {					// search compressed version
+    const std::string s( name + simple_extensions[format_order[i]] );
+    const int infd = open( s.c_str(), O_RDONLY | o_binary );
+    if( infd >= 0 ) { name = s; return infd; }
+    }
+  return -1;
+  }
+
+
+void get_format_types( const std::string & arg, int format_types[2] )
+  {
+  const unsigned i = std::min( arg.find( ',' ), arg.size() );
+  if( i > 0 ) format_types[0] = get_format_type( arg.substr( 0, i ) );
+  else format_types[0] = -1;
+  if( i + 1 < arg.size() ) format_types[1] =
+    get_format_type( arg.substr( i + 1 ) );
+  else format_types[1] = -1;
+  }
+
+
+bool check_identical( const char * const name1, const char * const name2 )
+  {
+  if( !std::strcmp( name1, name2 ) ) return true;
+  struct stat stat1, stat2;
+  if( stat( name1, &stat1 ) || stat( name2, &stat2 ) ) return false;
+  return ( stat1.st_ino == stat2.st_ino && stat1.st_dev == stat2.st_dev );
+  }