1 files changed, 32 insertions, 3 deletions
diff --git a/file_index.h b/file_index.h
index 2f055b1..92cf11c 100644
--- a/file_index.h
+++ b/file_index.h
@@ -25,7 +25,8 @@ class Block
   long long pos_, size_;		// pos + size <= INT64_MAX
 
 public:
-  Block( const long long p, const long long s ) : pos_( p ), size_( s ) {}
+  Block( const long long p, const long long s )
+    : pos_( p ), size_( s ) {}
 
   long long pos() const { return pos_; }
   long long size() const { return size_; }
@@ -34,9 +35,17 @@ public:
   void pos( const long long p ) { pos_ = p; }
   void size( const long long s ) { size_ = s; }
 
+  bool operator==( const Block & b ) const
+    { return pos_ == b.pos_ && size_ == b.size_; }
+  bool operator!=( const Block & b ) const
+    { return pos_ != b.pos_ || size_ != b.size_; }
+
+  bool operator<( const Block & b ) const { return pos_ < b.pos_; }
+
   bool overlaps( const Block & b ) const
     { return ( pos_ < b.end() && b.pos_ < end() ); }
   void shift( Block & b ) { ++size_; ++b.pos_; --b.size_; }
+  Block split( const long long pos );
   };
 
 
@@ -49,18 +58,35 @@ class File_index
     Member( const long long dp, const long long ds,
             const long long mp, const long long ms )
       : dblock( dp, ds ), mblock( mp, ms ) {}
+
+    bool operator==( const Member & m ) const { return ( mblock == m.mblock ); }
+    bool operator!=( const Member & m ) const { return ( mblock != m.mblock ); }
     };
 
   std::vector< Member > member_vector;
   std::string error_;
+  long long isize;
   int retval_;
 
 public:
-  File_index( const int infd );
+  File_index() : error_( "No index." ), isize( 0 ), retval_( 2 ) {}
+  explicit File_index( const int infd );
+  File_index( const std::vector< int > & infd_vector, const long long fsize );
 
+  int members() const { return member_vector.size(); }
   const std::string & error() const { return error_; }
   int retval() const { return retval_; }
 
+  bool operator==( const File_index & fi ) const
+    {
+    if( retval_ || fi.retval_ || isize != fi.isize ||
+        member_vector.size() != fi.member_vector.size() ) return false;
+    for( unsigned i = 0; i < member_vector.size(); ++i )
+      if( member_vector[i] != fi.member_vector[i] ) return false;
+    return true;
+    }
+  bool operator!=( const File_index & fi ) const { return !( *this == fi ); }
+
   long long data_end() const
     { if( member_vector.size() ) return member_vector.back().dblock.end();
       else return 0; }
@@ -69,11 +95,14 @@ public:
     { if( member_vector.size() ) return member_vector.back().mblock.end();
       else return 0; }
 
+  // total size including trailing garbage (if any)
+  long long file_size() const
+    { if( isize >= 0 ) return isize; else return 0; }
+
   const Block & dblock( const int i ) const
     { return member_vector[i].dblock; }
   const Block & mblock( const int i ) const
     { return member_vector[i].mblock; }
-  int members() const { return (int)member_vector.size(); }
   };