From 772fa304a20ba99d58b670ef1051944a92e3addf Mon Sep 17 00:00:00 2001
From: Jonathan Pryor <jonpryor@vt.edu>
Date: Wed, 27 Mar 2013 18:12:07 -0400
Subject: [PATCH] [mkbundle] Remove Mono.Posix, ICSharpCode.SharpZipLib deps

I want to make execution of mkbundle possible under .NET, and as such
I want to remove unnecessary dependencies.

Mono.Posix is only used for UnixMarshal heap methods; there's NO need
to use these when Marshal can be used.

That leaves DeflaterOutputStream, and it's possible to configure zlib
to accept deflate streams, allowing us to use GZipStream:

	http://stackoverflow.com/a/1838702/83444

Update template_z.c accordingly so that the compressed data works.

Two side results of this:

 1. Increased compression; my (really stupid) test app went from a
    compression ration of 31.39% to 32%

 2. This MAY make things WORSE when running on .NET < 4.5. This is
    fixed in .NET 4.5:

	http://msdn.microsoft.com/en-us/library/system.io.compression.deflatestream.aspx

	Starting with the .NET Framework 4.5, the DeflateStream class
	uses the zlib library. As a result, it provides a better
	compression algorithm and, in most cases, a smaller compressed
	file than it provides in earlier versions of the .NET
	Framework.
---
 mcs/tools/mkbundle/Makefile     |  3 +--
 mcs/tools/mkbundle/mkbundle.cs  | 14 +++++++-------
 mcs/tools/mkbundle/template_z.c |  3 ++-
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/mcs/tools/mkbundle/Makefile b/mcs/tools/mkbundle/Makefile
index ac97a4ac9fa..c4387a2fad3 100644
--- a/mcs/tools/mkbundle/Makefile
+++ b/mcs/tools/mkbundle/Makefile
@@ -8,8 +8,7 @@ OTHER_RES = template.c template_z.c template_main.c
 
 RESOURCE_FILES = $(OTHER_RES)
 
-LOCAL_MCS_FLAGS=-r:Mono.Posix.dll -r:ICSharpCode.SharpZipLib.dll \
-		$(OTHER_RES:%=-resource:%)
+LOCAL_MCS_FLAGS= $(OTHER_RES:%=-resource:%)
 
 EXTRA_DISTFILES = $(RESOURCE_FILES)
 
diff --git a/mcs/tools/mkbundle/mkbundle.cs b/mcs/tools/mkbundle/mkbundle.cs
index 945522b64d7..77cc7123e21 100644
--- a/mcs/tools/mkbundle/mkbundle.cs
+++ b/mcs/tools/mkbundle/mkbundle.cs
@@ -14,10 +14,10 @@ using System.Xml;
 using System.Collections.Generic;
 using System.Reflection;
 using System.IO;
+using System.IO.Compression;
 using System.Runtime.InteropServices;
 using System.Text;
-using Mono.Unix;
-using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
+
 
 #if NET_4_5
 using System.Threading.Tasks;
@@ -291,12 +291,12 @@ class MakeBundle {
 				int n;
 				if (compress) {
 					MemoryStream ms = new MemoryStream ();
-					DeflaterOutputStream deflate = new DeflaterOutputStream (ms);
+					GZipStream deflate = new GZipStream (ms, CompressionMode.Compress, leaveOpen:true);
 					while ((n = stream.Read (buffer, 0, buffer.Length)) != 0){
 						deflate.Write (buffer, 0, n);
 					}
 					stream.Close ();
-					deflate.Finish ();
+					deflate.Close ();
 					byte [] bytes = ms.GetBuffer ();
 					stream = new MemoryStream (bytes, 0, (int) ms.Length, false, false);
 				}
@@ -604,10 +604,10 @@ class MakeBundle {
 			return;
 		}
 
-		IntPtr buf = UnixMarshal.AllocHeap(8192);
+		IntPtr buf = Marshal.AllocHGlobal (8192);
 		if (uname (buf) != 0){
 			Console.WriteLine ("Warning: Unable to detect OS");
-			UnixMarshal.FreeHeap(buf);
+			Marshal.FreeHGlobal (buf);
 			return;
 		}
 		string os = Marshal.PtrToStringAnsi (buf);
@@ -615,7 +615,7 @@ class MakeBundle {
 		if (os == "Darwin")
 			style = "osx";
 		
-		UnixMarshal.FreeHeap(buf);
+		Marshal.FreeHGlobal (buf);
 	}
 
 	static bool IsUnix {
diff --git a/mcs/tools/mkbundle/template_z.c b/mcs/tools/mkbundle/template_z.c
index 7aac318bb88..7987f82c7e8 100644
--- a/mcs/tools/mkbundle/template_z.c
+++ b/mcs/tools/mkbundle/template_z.c
@@ -13,7 +13,8 @@ my_inflate (const Byte *compr, uLong compr_len, Byte *uncompr, uLong uncompr_len
 	memset (&stream, 0, sizeof (z_stream));
 	stream.next_in = (Byte *) compr;
 	stream.avail_in = (uInt) compr_len;
-	err = inflateInit (&stream);
+	/* To decompress gzip format: http://stackoverflow.com/a/1838702/83444 */
+	err = inflateInit2 (&stream, 16+MAX_WBITS);
 	if (err != Z_OK)
 		return 1;
 
-- 
2.25.1