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-rw-r--r--zcmpdiff.cc86
1 files changed, 86 insertions, 0 deletions
diff --git a/zcmpdiff.cc b/zcmpdiff.cc
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+/* 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 );
+ }