From 08272a29adf70b0a8ebaee40d6c29d2d79e054e6 Mon Sep 17 00:00:00 2001
From: Randy Heit <rheit@zdoom.fake>
Date: Sat, 16 Jun 2012 03:29:44 +0000
Subject: [PATCH] - Added textual descriptions of the zlib errors.

SVN r3689 (trunk)
---
 src/farchive.cpp |  3 ++-
 src/files.cpp    |  3 ++-
 src/g_game.cpp   |  2 +-
 src/i_net.cpp    |  4 ++--
 src/m_misc.cpp   | 30 ++++++++++++++++++++++++++++++
 src/m_misc.h     |  2 ++
 6 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/src/farchive.cpp b/src/farchive.cpp
index 6b0fafd18..1b41faef7 100644
--- a/src/farchive.cpp
+++ b/src/farchive.cpp
@@ -54,6 +54,7 @@
 #include "c_cvars.h"
 #include "c_dispatch.h"
 #include "d_player.h"
+#include "m_misc.h"
 #include "dobject.h"
 
 // These are special tokens found in the data stream of an archive.
@@ -408,7 +409,7 @@ void FCompressedFile::Explode ()
 				_heapchk();
 				M_Free (expand);
 				_heapchk();
-				I_Error ("Could not decompress cfile");
+				I_Error ("Could not decompress buffer: %s", M_ZLibError(r));
 			}
 		}
 		else
diff --git a/src/files.cpp b/src/files.cpp
index 2dbe2c778..d205429e1 100644
--- a/src/files.cpp
+++ b/src/files.cpp
@@ -36,6 +36,7 @@
 #include "files.h"
 #include "i_system.h"
 #include "templates.h"
+#include "m_misc.h"
 
 //==========================================================================
 //
@@ -223,7 +224,7 @@ FileReaderZ::FileReaderZ (FileReader &file, bool zip)
 
 	if (err != Z_OK)
 	{
-		I_Error ("FileReaderZ: inflateInit failed: %d\n", err);
+		I_Error ("FileReaderZ: inflateInit failed: %s\n", M_ZLibError(err));
 	}
 }
 
diff --git a/src/g_game.cpp b/src/g_game.cpp
index 224ade775..3aa4d3059 100644
--- a/src/g_game.cpp
+++ b/src/g_game.cpp
@@ -2513,7 +2513,7 @@ bool G_ProcessIFFDemo (char *mapname)
 		int r = uncompress (uncompressed, &uncompSize, demo_p, uLong(zdembodyend - demo_p));
 		if (r != Z_OK)
 		{
-			Printf ("Could not decompress demo!\n");
+			Printf ("Could not decompress demo! %s\n", M_ZLibError(r));
 			delete[] uncompressed;
 			return true;
 		}
diff --git a/src/i_net.cpp b/src/i_net.cpp
index ae28bb779..5b0b35907 100644
--- a/src/i_net.cpp
+++ b/src/i_net.cpp
@@ -62,7 +62,7 @@
 #include "templates.h"
 #include "c_console.h"
 #include "st_start.h"
-
+#include "m_misc.h"
 #include "doomstat.h"
 
 #include "i_net.h"
@@ -303,7 +303,7 @@ void PacketGet (void)
 //			Printf("recv %d/%lu\n", c, msgsize + 1);
 			if (err != Z_OK)
 			{
-				Printf("Net decompression failed (zlib error %d)\n", err);
+				Printf("Net decompression failed (zlib error %s)\n", M_ZLibError(err));
 				// Pretend no packet
 				doomcom.remotenode = -1;
 				return;
diff --git a/src/m_misc.cpp b/src/m_misc.cpp
index 924f45e7c..08149ad96 100644
--- a/src/m_misc.cpp
+++ b/src/m_misc.cpp
@@ -780,3 +780,33 @@ CCMD (screenshot)
 	else
 		G_ScreenShot (argv[1]);
 }
+
+//
+// M_ZlibError
+//
+FString M_ZLibError(int zerr)
+{
+	if (zerr >= 0)
+	{
+		return "OK";
+	}
+	else if (zerr < -6)
+	{
+		FString out;
+		out.Format("%d", zerr);
+		return out;
+	}
+	else
+	{
+		static const char *errs[6] =
+		{
+			"Errno",
+			"Stream Error",
+			"Data Error",
+			"Memory Error",
+			"Buffer Error",
+			"Version Error"
+		};
+		return errs[-zerr - 1];
+	}
+}
diff --git a/src/m_misc.h b/src/m_misc.h
index 23905d765..27006cf87 100644
--- a/src/m_misc.h
+++ b/src/m_misc.h
@@ -47,4 +47,6 @@ void M_SaveCustomKeys (FConfigFile *config, char *section, char *subsection, siz
 // Prepends ~/.zdoom to path
 FString GetUserFile (const char *path);
 
+FString M_ZLibError(int zerrnum);
+
 #endif