1 files changed, 78 insertions, 0 deletions
diff --git a/zcmpdiff.cc b/zcmpdiff.cc
new file mode 100644
index 0000000..16e3980
--- /dev/null
+++ b/zcmpdiff.cc
@@ -0,0 +1,78 @@
+/* Common code for zcmp and zdiff
+   Copyright (C) 2010-2024 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 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+
+int open_instream( const std::string & input_filename )
+  {
+  const int infd = open( input_filename.c_str(), O_RDONLY | O_BINARY );
+  if( infd < 0 )
+    show_file_error( input_filename.c_str(), "Can't open input file", errno );
+  return infd;
+  }
+
+
+int open_other_instream( std::string & name )
+  {
+  const int eindex = extension_index( name );	// search extension
+  if( eindex >= 0 && enabled_format( -1 ) )	// open uncompressed version
+    {
+    std::string s( name, 0, name.size() - std::strlen( extension_from( eindex ) ) );
+    s += extension_to( eindex );
+    const int infd = open( s.c_str(), O_RDONLY | O_BINARY );
+    if( infd >= 0 ) { name = s; return infd; }
+    }
+  const int eformat = extension_format( eindex );
+  for( int i = 0; i < num_formats; ++i )	// search compressed version
+    {
+    const int format_index = format_order[i];
+    if( eformat != format_index && enabled_format( format_index ) )
+      {
+      std::string s( name, 0, name.size() - std::strlen( extension_from( eindex ) ) );
+      s += simple_extensions[format_index];
+      const int infd = open( s.c_str(), O_RDONLY | O_BINARY );
+      if( infd >= 0 ) { name = s; return infd; }
+      }
+    }
+  return -1;
+  }
+
+
+void parse_format_types2( const std::string & arg, const char * const pn,
+                          int format_types[2] )
+  {
+  const unsigned i = std::min( arg.find( ',' ), arg.size() );
+  if( i != std::min( arg.rfind( ',' ), arg.size() ) )
+    { show_option_error( arg.c_str(), "Too many formats in", pn );
+      std::exit( 1 ); }
+  format_types[0] =
+    ( i > 0 ) ? parse_format_type( arg.substr( 0, i ), pn ) : -1;
+  format_types[1] =
+    ( i + 1 < arg.size() ) ? parse_format_type( arg.substr( i + 1 ), pn ) : -1;
+  }
+
+
+bool check_identical( const char * const name1, const char * const name2 )
+  {
+  if( std::strcmp( name1, name2 ) == 0 ) 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 );
+  }