Merging upstream version 1.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 57 insertions, 57 deletions

diff --git a/lzd.cc b/lzd.cc
index 6fd536a..503bc36 100644
--- a/lzd.cc
+++ b/lzd.cc
@@ -1,5 +1,5 @@
 /*  Lzd - Educational decompressor for the lzip format
-    Copyright (C) 2013-2017 Antonio Diaz Diaz.
+    Copyright (C) 2013-2019 Antonio Diaz Diaz.
 
     This program is free software. Redistribution and use in source and
     binary forms, with or without modification, are permitted provided
@@ -29,7 +29,7 @@
 #include <cstring>
 #include <stdint.h>
 #include <unistd.h>
-#if defined(__MSVCRT__) || defined(__OS2__) || defined(_MSC_VER)
+#if defined(__MSVCRT__) || defined(__OS2__) || defined(__DJGPP__)
 #include <fcntl.h>
 #include <io.h>
 #endif
@@ -130,9 +130,9 @@ public:
 const CRC32 crc32;
 
 
-typedef uint8_t File_header[6];	// 0-3 magic, 4 version, 5 coded_dict_size
+typedef uint8_t Lzip_header[6];	// 0-3 magic, 4 version, 5 coded_dict_size
 
-typedef uint8_t File_trailer[20];
+typedef uint8_t Lzip_trailer[20];
 			//  0-3  CRC32 of the uncompressed data
 			//  4-11 size of the uncompressed data
 			// 12-19 member size including header and trailer
@@ -326,6 +326,7 @@ bool LZ_decoder::decode_member()		// Returns false if error
     const int pos_state = data_position() & pos_state_mask;
     if( rdec.decode_bit( bm_match[state()][pos_state] ) == 0 )	// 1st bit
       {
+      // literal byte
       const uint8_t prev_byte = peek( 0 );
       const int literal_state = prev_byte >> ( 8 - literal_context_bits );
       Bit_model * const bm = bm_literal[literal_state];
@@ -334,67 +335,66 @@ bool LZ_decoder::decode_member()		// Returns false if error
       else
         put_byte( rdec.decode_matched( bm, peek( rep0 ) ) );
       state.set_char();
+      continue;
       }
-    else					// match or repeated match
+    // match or repeated match
+    int len;
+    if( rdec.decode_bit( bm_rep[state()] ) != 0 )		// 2nd bit
       {
-      int len;
-      if( rdec.decode_bit( bm_rep[state()] ) != 0 )		// 2nd bit
+      if( rdec.decode_bit( bm_rep0[state()] ) == 0 )		// 3rd bit
         {
-        if( rdec.decode_bit( bm_rep0[state()] ) == 0 )		// 3rd bit
-          {
-          if( rdec.decode_bit( bm_len[state()][pos_state] ) == 0 ) // 4th bit
-            { state.set_short_rep(); put_byte( peek( rep0 ) ); continue; }
-          }
+        if( rdec.decode_bit( bm_len[state()][pos_state] ) == 0 ) // 4th bit
+          { state.set_short_rep(); put_byte( peek( rep0 ) ); continue; }
+        }
+      else
+        {
+        unsigned distance;
+        if( rdec.decode_bit( bm_rep1[state()] ) == 0 )		// 4th bit
+          distance = rep1;
         else
           {
-          unsigned distance;
-          if( rdec.decode_bit( bm_rep1[state()] ) == 0 )	// 4th bit
-            distance = rep1;
+          if( rdec.decode_bit( bm_rep2[state()] ) == 0 )	// 5th bit
+            distance = rep2;
           else
-            {
-            if( rdec.decode_bit( bm_rep2[state()] ) == 0 )	// 5th bit
-              distance = rep2;
-            else
-              { distance = rep3; rep3 = rep2; }
-            rep2 = rep1;
-            }
-          rep1 = rep0;
-          rep0 = distance;
+            { distance = rep3; rep3 = rep2; }
+          rep2 = rep1;
           }
-        state.set_rep();
-        len = min_match_len + rdec.decode_len( rep_len_model, pos_state );
+        rep1 = rep0;
+        rep0 = distance;
         }
-      else					// match
+      state.set_rep();
+      len = min_match_len + rdec.decode_len( rep_len_model, pos_state );
+      }
+    else					// match
+      {
+      rep3 = rep2; rep2 = rep1; rep1 = rep0;
+      len = min_match_len + rdec.decode_len( match_len_model, pos_state );
+      const int len_state = std::min( len - min_match_len, len_states - 1 );
+      rep0 = rdec.decode_tree( bm_dis_slot[len_state], dis_slot_bits );
+      if( rep0 >= start_dis_model )
         {
-        rep3 = rep2; rep2 = rep1; rep1 = rep0;
-        len = min_match_len + rdec.decode_len( match_len_model, pos_state );
-        const int len_state = std::min( len - min_match_len, len_states - 1 );
-        rep0 = rdec.decode_tree( bm_dis_slot[len_state], dis_slot_bits );
-        if( rep0 >= start_dis_model )
+        const unsigned dis_slot = rep0;
+        const int direct_bits = ( dis_slot >> 1 ) - 1;
+        rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+        if( dis_slot < end_dis_model )
+          rep0 += rdec.decode_tree_reversed( bm_dis + ( rep0 - dis_slot ),
+                                             direct_bits );
+        else
           {
-          const unsigned dis_slot = rep0;
-          const int direct_bits = ( dis_slot >> 1 ) - 1;
-          rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
-          if( dis_slot < end_dis_model )
-            rep0 += rdec.decode_tree_reversed( bm_dis + ( rep0 - dis_slot ),
-                                               direct_bits );
-          else
+          rep0 += rdec.decode( direct_bits - dis_align_bits ) << dis_align_bits;
+          rep0 += rdec.decode_tree_reversed( bm_align, dis_align_bits );
+          if( rep0 == 0xFFFFFFFFU )		// marker found
             {
-            rep0 += rdec.decode( direct_bits - dis_align_bits ) << dis_align_bits;
-            rep0 += rdec.decode_tree_reversed( bm_align, dis_align_bits );
-            if( rep0 == 0xFFFFFFFFU )		// marker found
-              {
-              flush_data();
-              return ( len == min_match_len );	// End Of Stream marker
-              }
+            flush_data();
+            return ( len == min_match_len );	// End Of Stream marker
             }
           }
-        state.set_match();
-        if( rep0 >= dictionary_size || ( rep0 >= pos && !pos_wrapped ) )
-          { flush_data(); return false; }
         }
-      for( int i = 0; i < len; ++i ) put_byte( peek( rep0 ) );
+      state.set_match();
+      if( rep0 >= dictionary_size || ( rep0 >= pos && !pos_wrapped ) )
+        { flush_data(); return false; }
       }
+    for( int i = 0; i < len; ++i ) put_byte( peek( rep0 ) );
     }
   flush_data();
   return false;
@@ -412,7 +412,7 @@ int main( const int argc, const char * const argv[] )
                  "It is not safe to use lzd for any real work.\n"
                  "\nUsage: %s < file.lz > file\n", argv[0] );
     std::printf( "Lzd decompresses from standard input to standard output.\n"
-                 "\nCopyright (C) 2017 Antonio Diaz Diaz.\n"
+                 "\nCopyright (C) 2019 Antonio Diaz Diaz.\n"
                  "This is free software: you are free to change and redistribute it.\n"
                  "There is NO WARRANTY, to the extent permitted by law.\n"
                  "Report bugs to lzip-bug@nongnu.org\n"
@@ -420,14 +420,14 @@ int main( const int argc, const char * const argv[] )
     return 0;
     }
 
-#if defined(__MSVCRT__) || defined(__OS2__) || defined(_MSC_VER)
-  setmode( fileno( stdin ), O_BINARY );
-  setmode( fileno( stdout ), O_BINARY );
+#if defined(__MSVCRT__) || defined(__OS2__) || defined(__DJGPP__)
+  setmode( STDIN_FILENO, O_BINARY );
+  setmode( STDOUT_FILENO, O_BINARY );
 #endif
 
   for( bool first_member = true; ; first_member = false )
     {
-    File_header header;				// verify header
+    Lzip_header header;				// verify header
     for( int i = 0; i < 6; ++i ) header[i] = std::getc( stdin );
     if( std::feof( stdin ) || std::memcmp( header, "LZIP\x01", 5 ) != 0 )
       {
@@ -446,7 +446,7 @@ int main( const int argc, const char * const argv[] )
     if( !decoder.decode_member() )
       { std::fputs( "Data error\n", stderr ); return 2; }
 
-    File_trailer trailer;			// verify trailer
+    Lzip_trailer trailer;			// verify trailer
     for( int i = 0; i < 20; ++i ) trailer[i] = std::getc( stdin );
     unsigned crc = 0;
     for( int i = 3; i >= 0; --i ) { crc <<= 8; crc += trailer[i]; }
@@ -457,7 +457,7 @@ int main( const int argc, const char * const argv[] )
     }
 
   if( std::fclose( stdout ) != 0 )
-    { std::fprintf( stderr, "Can't close stdout: %s\n", std::strerror( errno ) );
+    { std::fprintf( stderr, "Error closing stdout: %s\n", std::strerror( errno ) );
       return 1; }
   return 0;
   }