add gzip, bzip2

'

src/cmd/bzip2/lib/bzassert.c

@@ -0,0 +1,109 @@
+/*
+ * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
+ * FROM THE BZIP2 DISTRIBUTION.
+ *
+ * It has been modified, mainly to break the library
+ * into smaller pieces.
+ *
+ * Russ Cox
+ * rsc@plan9.bell-labs.com
+ * July 2000
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Library top-level functions.                          ---*/
+/*---                                               bzlib.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+  2. The origin of this software must not be misrepresented; you must 
+     not claim that you wrote the original software.  If you use this 
+     software in a product, an acknowledgment in the product 
+     documentation would be appreciated but is not required.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. The name of the author may not be used to endorse or promote 
+     products derived from this software without specific prior written 
+     permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+/*--
+   CHANGES
+   ~~~~~~~
+   0.9.0 -- original version.
+
+   0.9.0a/b -- no changes in this file.
+
+   0.9.0c
+      * made zero-length BZ_FLUSH work correctly in bzCompress().
+      * fixed bzWrite/bzRead to ignore zero-length requests.
+      * fixed bzread to correctly handle read requests after EOF.
+      * wrong parameter order in call to bzDecompressInit in
+        bzBuffToBuffDecompress.  Fixed.
+--*/
+
+#include "os.h"
+#include "bzlib.h"
+#include "bzlib_private.h"
+#include "bzlib_stdio.h"
+#include "bzlib_stdio_private.h"
+
+
+void BZ2_bz__AssertH__fail ( int errcode )
+{
+   fprintf(stderr, 
+      "\n\nbzip2/libbzip2: internal error number %d.\n"
+      "This is a bug in bzip2/libbzip2, %s.\n"
+      "Please report it to me at: jseward@acm.org.  If this happened\n"
+      "when you were using some program which uses libbzip2 as a\n"
+      "component, you should also report this bug to the author(s)\n"
+      "of that program.  Please make an effort to report this bug;\n"
+      "timely and accurate bug reports eventually lead to higher\n"
+      "quality software.  Thanks.  Julian Seward, 21 March 2000.\n\n",
+      errcode,
+      BZ2_bzlibVersion()
+   );
+   exit(3);
+}