From d3cd27c3b6cdb47ef91c4ffba51257ebd46b1250 Mon Sep 17 00:00:00 2001
From: David Shaw <dshaw@jabberwocky.com>
Date: Fri, 31 Oct 2003 05:39:41 +0000
Subject: [PATCH] * configure.ac: Locate libbz2 for bzip2 compression support.

---
 ChangeLog    |  4 ++++
 configure.ac | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index f11b71aca..1c6b15ea7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2003-10-30  David Shaw  <dshaw@jabberwocky.com>
+
+	* configure.ac: Locate libbz2 for bzip2 compression support.
+
 2003-10-26  David Shaw  <dshaw@jabberwocky.com>
 
 	* NEWS: Note --symmetric --encrypt and the improved config file
diff --git a/configure.ac b/configure.ac
index 97ae48c33..88cb3501d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -119,6 +119,7 @@ use_aes=yes
 use_twofish=yes
 use_sha256=yes
 use_sha512=yes
+use_bzip2=yes
 use_exec=yes
 
 AC_ARG_ENABLE(minimal,
@@ -130,6 +131,7 @@ AC_ARG_ENABLE(minimal,
    use_twofish=no
    use_sha256=no
    use_sha512=no
+   use_bzip2=no
    use_exec=no)
 
 AC_MSG_CHECKING([whether to enable the IDEA cipher])
@@ -211,6 +213,13 @@ AC_ARG_ENABLE(sha512,
    use_sha512=$enableval)
 AC_MSG_RESULT($use_sha512)
 
+dnl BZLIB is defined only after we confirm the library is available later
+AC_MSG_CHECKING([whether to enable the BZIP2 compression algorithm])
+AC_ARG_ENABLE(bzip2,
+   AC_HELP_STRING([--disable-bzip2],[disable the BZIP2 compression algorithm]),
+   use_bzip2=$enableval)
+AC_MSG_RESULT($use_bzip2)
+
 AC_MSG_CHECKING([whether to enable external program execution])
 AC_ARG_ENABLE(exec,
     AC_HELP_STRING([--disable-exec],[disable all external program execution]),
@@ -996,6 +1005,34 @@ if test "$use_local_zlib" = yes ; then
 else
     AM_CONDITIONAL(ENABLE_LOCAL_ZLIB, false)
 fi
+
+if test "$use_bzip2" = yes ; then
+  _cppflags="${CPPFLAGS}"
+  _ldflags="${LDFLAGS}"
+  AC_ARG_WITH(bzip2,
+     AC_HELP_STRING([--with-bzip2=DIR],[look for bzip2 in DIR]),
+      [
+      if test -d "$withval" ; then
+        CPPFLAGS="${CPPFLAGS} -I$withval/include"
+        LDFLAGS="${LDFLAGS} -L$withval/lib"
+      fi
+      ],withval="")
+
+  if test "$withval" != no ; then
+     AC_CHECK_HEADER(bzlib.h,
+        AC_CHECK_LIB(bz2,BZ2_bzCompressInit,
+  	  [
+	  have_bz2=yes
+	  ZLIBS="$ZLIBS -lbz2"
+	  AC_DEFINE(HAVE_BZIP2,1,
+		  [Defined if the bz2 compression library is available])
+	  ],
+	  CPPFLAGS=${_cppflags} LDFLAGS=${_ldflags}),
+	  CPPFLAGS=${_cppflags} LDFLAGS=${_ldflags})
+  fi
+fi
+
+AM_CONDITIONAL(ENABLE_BZIP2_SUPPORT,test x"$have_bz2" = "xyes")
 AC_SUBST(ZLIBS)