1 files changed, 91 insertions, 0 deletions
diff --git a/lzip_index.h b/lzip_index.h
new file mode 100644
index 0000000..a4fbd56
--- /dev/null
+++ b/lzip_index.h
@@ -0,0 +1,91 @@
+/* Lunzip - Decompressor for the lzip format
+   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 INT64_MAX
+#define INT64_MAX 0x7FFFFFFFFFFFFFFFLL
+#endif
+
+
+struct Block
+  {
+  long long pos, size;		/* pos >= 0, size >= 0, pos + size <= INT64_MAX */
+  };
+
+static inline void init_block( struct Block * const b,
+                               const long long p, const long long s )
+  { b->pos = p; b->size = s; }
+
+static inline long long block_end( const struct Block b )
+  { return b.pos + b.size; }
+
+
+struct Member
+  {
+  struct Block dblock, mblock;		/* data block, member block */
+  unsigned dictionary_size;
+  };
+
+static inline void init_member( struct Member * const m,
+                                const long long dpos, const long long dsize,
+                                const long long mpos, const long long msize,
+                                const unsigned dict_size )
+  { init_block( &m->dblock, dpos, dsize ); init_block( &m->mblock, mpos, msize );
+    m->dictionary_size = dict_size; }
+
+struct Lzip_index
+  {
+  struct Member * member_vector;
+  char * error;
+  long long insize;
+  long members;
+  int error_size;
+  int retval;
+  unsigned dictionary_size;	/* largest dictionary size in the file */
+  };
+
+bool Li_init( struct Lzip_index * const li, const int infd,
+              const struct Cl_options * const cl_opts );
+
+void Li_free( struct Lzip_index * const li );
+
+static inline long long Li_udata_size( const struct Lzip_index * const li )
+  {
+  if( li->members <= 0 ) return 0;
+  return block_end( li->member_vector[li->members-1].dblock );
+  }
+
+static inline long long Li_cdata_size( const struct Lzip_index * const li )
+  {
+  if( li->members <= 0 ) return 0;
+  return block_end( li->member_vector[li->members-1].mblock );
+  }
+
+  /* total size including trailing data (if any) */
+static inline long long Li_file_size( const struct Lzip_index * const li )
+  { if( li->insize >= 0 ) return li->insize; else return 0; }
+
+static inline const struct Block * Li_dblock( const struct Lzip_index * const li,
+                                              const long i )
+  { return &li->member_vector[i].dblock; }
+
+static inline const struct Block * Li_mblock( const struct Lzip_index * const li,
+                                              const long i )
+  { return &li->member_vector[i].mblock; }
+
+static inline unsigned Li_dictionary_size( const struct Lzip_index * const li,
+                                           const long i )
+  { return li->member_vector[i].dictionary_size; }