# LZMA support for Midnight Commander

# 2006-03-17

#

# This patch adds basic support for LZMA compressed files to

# Midnight Commander 4.6.1. You should have LZMA utils 4.32.x

# or later. Older versions of LZMA utils will *not* work.

#

# Copyright (C) 2006 Lasse Collin <lasse.collin@tukaani.org>

#

# This patch 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.

diff -up mc-4.6.2-pre1/edit/edit.c.lzmavfs mc-4.6.2-pre1/edit/edit.c

--- mc-4.6.2-pre1/edit/edit.c.lzmavfs	2008-08-05 15:31:29.000000000 +0200

+++ mc-4.6.2-pre1/edit/edit.c	2008-08-05 15:31:29.000000000 +0200

@@ -185,6 +185,7 @@ edit_load_file_fast (WEdit *edit, const 

 static const struct edit_filters {

     const char *read, *write, *extension;

 } all_filters[] = {

+    { "lzma -cd %s 2>&1",   "lzma > %s",   ".lzma" },

     { "bzip2 -cd %s 2>&1",  "bzip2 > %s",  ".bz2" },

     { "gzip -cd %s 2>&1",   "gzip > %s",   ".gz"  },

     { "gzip -cd %s 2>&1",   "gzip > %s",   ".Z"   }

diff -up mc-4.6.2-pre1/src/util.c.lzmavfs mc-4.6.2-pre1/src/util.c

--- mc-4.6.2-pre1/src/util.c.lzmavfs	2008-08-05 15:31:29.000000000 +0200

+++ mc-4.6.2-pre1/src/util.c	2008-08-05 15:31:29.000000000 +0200

@@ -1239,7 +1239,7 @@ get_current_wd (char *buffer, int size)

 enum compression_type

 get_compression_type (int fd)

 {

-    unsigned char magic[4];

+    unsigned char magic[16];

     /* Read the magic signature */

     if (mc_read (fd, (char *) magic, 4) != 4)

@@ -1283,6 +1283,31 @@ get_compression_type (int fd)

 	    return COMPRESSION_BZIP2;

 	}

     }

+

+    /* LZMA files; both LZMA_Alone and LZMA utils formats. The LZMA_Alone

+     * format is used by the LZMA_Alone tool from LZMA SDK. The LZMA utils

+     * format is the default format of LZMA utils 4.32.1 and later. */

+    if (magic[0] < 0xE1 || (magic[0] == 0xFF && magic[1] == 'L' &&

+	magic[2] == 'Z' && magic[3] == 'M')) {

+	if (mc_read (fd, (char *) magic + 4, 9) == 9) {

+	    /* LZMA utils format */

+	    if (magic[0] == 0xFF && magic[4] == 'A' && magic[5] == 0x00)

+		return COMPRESSION_LZMA;

+	    /* The LZMA_Alone format has no magic bytes, thus we

+	     * need to play a wizard. This can give false positives,

+	     * thus the detection below should be removed when

+	     * the newer LZMA utils format has got popular. */

+	    if (magic[0] < 0xE1 && magic[4] < 0x20 &&

+		((magic[10] == 0x00 && magic[11] == 0x00 &&

+		  magic[12] == 0x00) ||

+		 (magic[5] == 0xFF && magic[6] == 0xFF &&

+		  magic[7] == 0xFF && magic[8] == 0xFF &&

+		  magic[9] == 0xFF && magic[10] == 0xFF &&

+		  magic[11] == 0xFF && magic[12] == 0xFF)))

+		return COMPRESSION_LZMA;

+	}

+    }

+

     return 0;

 }

@@ -1293,6 +1318,7 @@ decompress_extension (int type)

 	case COMPRESSION_GZIP: return "#ugz";

 	case COMPRESSION_BZIP:   return "#ubz";

 	case COMPRESSION_BZIP2:  return "#ubz2";

+	case COMPRESSION_LZMA:  return "#ulzma";

 	}

 	/* Should never reach this place */

 	fprintf (stderr, "Fatal: decompress_extension called with an unknown argument\n");

diff -up mc-4.6.2-pre1/src/util.h.lzmavfs mc-4.6.2-pre1/src/util.h

--- mc-4.6.2-pre1/src/util.h.lzmavfs	2008-08-05 15:31:29.000000000 +0200

+++ mc-4.6.2-pre1/src/util.h	2008-08-05 15:31:29.000000000 +0200

@@ -186,7 +186,8 @@ enum compression_type {

 	COMPRESSION_NONE,

 	COMPRESSION_GZIP,

 	COMPRESSION_BZIP,

-	COMPRESSION_BZIP2

+	COMPRESSION_BZIP2,

+	COMPRESSION_LZMA

 };

 /* Looks for ``magic'' bytes at the start of the VFS file to guess the

diff -up mc-4.6.2-pre1/vfs/extfs/iso9660.in.lzmavfs mc-4.6.2-pre1/vfs/extfs/iso9660.in

--- mc-4.6.2-pre1/vfs/extfs/iso9660.in.lzmavfs	2006-07-19 13:19:52.000000000 +0200

+++ mc-4.6.2-pre1/vfs/extfs/iso9660.in	2008-08-05 15:31:29.000000000 +0200

@@ -29,6 +29,7 @@ test_iso () {

 mcisofs_list () {

 # left as a reminder to implement compressed image support =)

 case "$1" in

+  *.lzma) MYCAT="lzma -dc";;

   *.bz2) MYCAT="bzip2 -dc";;

   *.gz)  MYCAT="gzip -dc";;

   *.z)   MYCAT="gzip -dc";;

diff -up mc-4.6.2-pre1/vfs/extfs/lslR.in.lzmavfs mc-4.6.2-pre1/vfs/extfs/lslR.in

--- mc-4.6.2-pre1/vfs/extfs/lslR.in.lzmavfs	2003-06-22 11:54:21.000000000 +0200

+++ mc-4.6.2-pre1/vfs/extfs/lslR.in	2008-08-05 15:31:29.000000000 +0200

@@ -12,6 +12,7 @@ AWK=@AWK@

 mclslRfs_list () {

 case "$1" in

+  *.lzma) MYCAT="lzma -dc";;

   *.bz2) MYCAT="bzip2 -dc";;

   *.gz)  MYCAT="gzip -dc";;

   *.z)   MYCAT="gzip -dc";;

diff -up mc-4.6.2-pre1/vfs/extfs/mailfs.in.lzmavfs mc-4.6.2-pre1/vfs/extfs/mailfs.in

--- mc-4.6.2-pre1/vfs/extfs/mailfs.in.lzmavfs	2006-05-28 14:35:57.000000000 +0200

+++ mc-4.6.2-pre1/vfs/extfs/mailfs.in	2008-08-05 15:31:29.000000000 +0200

@@ -7,6 +7,7 @@ use bytes;

 $zcat="zcat";                 # gunzip to stdout

 $bzcat="bzip2 -dc";           # bunzip2 to stdout

+$lzcat="lzma -dc";            # unlzma to stdout

 $file="file";                 # "file" command

 $TZ='GMT';                    # default timezone (for Date module)

@@ -182,6 +183,8 @@ if (/gzip/) {

     exit 1 unless (open IN, "$zcat $mbox_qname|");

 } elsif (/bzip/) {

     exit 1 unless (open IN, "$bzcat $mbox_qname|");

+} elsif (/lzma/) {

+    exit 1 unless (open IN, "$lzcat $mbox_qname|");

 } else {

     exit 1 unless (open IN, "<$mbox_name");

 }

diff -up mc-4.6.2-pre1/vfs/extfs/patchfs.in.lzmavfs mc-4.6.2-pre1/vfs/extfs/patchfs.in

--- mc-4.6.2-pre1/vfs/extfs/patchfs.in.lzmavfs	2004-11-17 00:00:40.000000000 +0100

+++ mc-4.6.2-pre1/vfs/extfs/patchfs.in	2008-08-05 15:31:29.000000000 +0200

@@ -12,6 +12,7 @@ use POSIX;

 use File::Temp 'tempfile';

 # standard binaries

+my $lzma = 'lzma';

 my $bzip = 'bzip2';

 my $gzip = 'gzip';

 my $fileutil = 'file';

@@ -70,7 +71,9 @@ sub myin

     my ($qfname)=(quotemeta $_[0]);

     $_=`$fileutil $qfname`;

-    if (/bzip/) {

+    if (/lzma/) {

+	return "$lzma -dc $qfname";

+    } elsif (/bzip/) {

 	return "$bzip -dc $qfname";

     } elsif (/gzip/) {

 	return "$gzip -dc $qfname";

@@ -86,7 +89,9 @@ sub myout

     my ($sep) = $append ? '>>' : '>';

     $_=`$fileutil $qfname`;

-    if (/bzip/) {

+    if (/lzma/) {

+	return "$lzma -c $sep $qfname";

+    } elsif (/bzip/) {

 	return "$bzip -c $sep $qfname";

     } elsif (/gzip/) {

 	return "$gzip -c $sep $qfname";

diff -up mc-4.6.2-pre1/vfs/extfs/sfs.ini.lzmavfs mc-4.6.2-pre1/vfs/extfs/sfs.ini

--- mc-4.6.2-pre1/vfs/extfs/sfs.ini.lzmavfs	1998-12-15 16:57:43.000000000 +0100

+++ mc-4.6.2-pre1/vfs/extfs/sfs.ini	2008-08-05 15:31:29.000000000 +0200

@@ -10,6 +10,8 @@ bz/1	bzip < %1 > %3

 ubz/1	bzip -d < %1 > %3

 bz2/1	bzip2 < %1 > %3

 ubz2/1	bzip2 -d < %1 > %3

+lzma/1	lzma < %1 > %3

+ulzma/1	lzma -d < %1 > %3

 tar/1	tar cf %3 %1

 tgz/1	tar czf %3 %1

 uhtml/1	lynx -force_html -dump %1 > %3