- uncouple the file system from the engine's Printf function.

This is needed to use it in non GZDoom based projects.

src/common/audio/music/i_soundfont.cpp

@@ -197,7 +197,7 @@ FileReader FSF2Reader::OpenFile(const char *name)
 FZipPatReader::FZipPatReader(const char *filename)
 {
 	mAllowAbsolutePaths = true;
-	resf = FResourceFile::OpenResourceFile(filename, true);
+	resf = FResourceFile::OpenResourceFile(filename);
 }
 
 FZipPatReader::~FZipPatReader()

src/common/filesystem/file_7z.cpp

@@ -39,7 +39,6 @@
 
 #include "resourcefile.h"
 #include "cmdlib.h"
-#include "printf.h"
 
 
 
@@ -189,7 +188,7 @@ class F7ZFile : public FResourceFile
 
 public:
 	F7ZFile(const char * filename, FileReader &filer);
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 	virtual ~F7ZFile();
 	virtual FResourceLump *GetLump(int no) { return ((unsigned)no < NumLumps)? &Lumps[no] : NULL; }
 };
@@ -216,7 +215,7 @@ F7ZFile::F7ZFile(const char * filename, FileReader &filer)
 //
 //==========================================================================
 
-bool F7ZFile::Open(bool quiet, LumpFilterInfo *filter)
+bool F7ZFile::Open(LumpFilterInfo *filter, FileSystemMessageFunc Printf)
 {
 	Archive = new C7zArchive(Reader);
 	int skipped = 0;
@@ -227,25 +226,21 @@ bool F7ZFile::Open(bool quiet, LumpFilterInfo *filter)
 	{
 		delete Archive;
 		Archive = NULL;
-		if (!quiet)
-		{
-			Printf("\n" TEXTCOLOR_RED "%s: ", FileName.GetChars());
 		if (res == SZ_ERROR_UNSUPPORTED)
 		{
-				Printf("Decoder does not support this archive\n");
+			Printf(FSMessageLevel::Error, "%s: Decoder does not support this archive\n", FileName.GetChars());
 		}
 		else if (res == SZ_ERROR_MEM)
 		{
-				Printf("Cannot allocate memory\n");
+			Printf(FSMessageLevel::Error, "Cannot allocate memory\n");
 		}
 		else if (res == SZ_ERROR_CRC)
 		{
-				Printf("CRC error\n");
+			Printf(FSMessageLevel::Error, "CRC error\n");
 		}
 		else
 		{
-				Printf("error #%d\n", res);
+			Printf(FSMessageLevel::Error, "error #%d\n", res);
-			}
 		}
 		return false;
 	}
@@ -308,7 +303,7 @@ bool F7ZFile::Open(bool quiet, LumpFilterInfo *filter)
 
 		if (SZ_OK != Archive->Extract(Lumps[0].Position, &temp[0]))
 		{
-			if (!quiet) Printf("\n%s: unsupported 7z/LZMA file!\n", FileName.GetChars());
+			Printf(FSMessageLevel::Error, "%s: unsupported 7z/LZMA file!\n", FileName.GetChars());
 			return false;
 		}
 	}
@@ -356,7 +351,7 @@ int F7ZLump::FillCache()
 //
 //==========================================================================
 
-FResourceFile *Check7Z(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *Check7Z(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char head[k7zSignatureSize];
 
@@ -368,7 +363,7 @@ FResourceFile *Check7Z(const char *filename, FileReader &file, bool quiet, LumpF
 		if (!memcmp(head, k7zSignature, k7zSignatureSize))
 		{
 			auto rf = new F7ZFile(filename, file);
-			if (rf->Open(quiet, filter)) return rf;
+			if (rf->Open(filter, Printf)) return rf;
 
 			file = std::move(rf->Reader); // to avoid destruction of reader
 			delete rf;

src/common/filesystem/file_directory.cpp

@@ -38,7 +38,6 @@
 
 #include "resourcefile.h"
 #include "cmdlib.h"
-#include "printf.h"
 #include "findfile.h"
 
 //==========================================================================
@@ -67,12 +66,12 @@ class FDirectory : public FResourceFile
 	TArray<FDirectoryLump> Lumps;
 	const bool nosubdir;
 
-	int AddDirectory(const char *dirpath);
+	int AddDirectory(const char* dirpath, FileSystemMessageFunc Printf);
 	void AddEntry(const char *fullpath, int size);
 
 public:
 	FDirectory(const char * dirname, bool nosubdirflag = false);
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 	virtual FResourceLump *GetLump(int no) { return ((unsigned)no < NumLumps)? &Lumps[no] : NULL; }
 };
 
@@ -110,7 +109,7 @@ FDirectory::FDirectory(const char * directory, bool nosubdirflag)
 //
 //==========================================================================
 
-int FDirectory::AddDirectory(const char *dirpath)
+int FDirectory::AddDirectory(const char *dirpath, FileSystemMessageFunc Printf)
 {
 	void * handle;
 	int count = 0;
@@ -122,7 +121,7 @@ int FDirectory::AddDirectory(const char *dirpath)
 	handle = I_FindFirst(dirmatch.GetChars(), &find);
 	if (handle == ((void *)(-1)))
 	{
-		Printf("Could not scan '%s': %s\n", dirpath, strerror(errno));
+		Printf(FSMessageLevel::Error, "Could not scan '%s': %s\n", dirpath, strerror(errno));
 	}
 	else
 	{
@@ -148,7 +147,7 @@ int FDirectory::AddDirectory(const char *dirpath)
 				}
 				FString newdir = dirpath;
 				newdir << fi << '/';
-				count += AddDirectory(newdir);
+				count += AddDirectory(newdir, Printf);
 			}
 			else
 			{
@@ -193,9 +192,9 @@ int FDirectory::AddDirectory(const char *dirpath)
 //
 //==========================================================================
 
-bool FDirectory::Open(bool quiet, LumpFilterInfo* filter)
+bool FDirectory::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
-	NumLumps = AddDirectory(FileName);
+	NumLumps = AddDirectory(FileName, Printf);
 	PostProcessArchive(&Lumps[0], sizeof(FDirectoryLump), filter);
 	return true;
 }
@@ -265,10 +264,10 @@ int FDirectoryLump::FillCache()
 //
 //==========================================================================
 
-FResourceFile *CheckDir(const char *filename, bool quiet, bool nosubdirflag, LumpFilterInfo* filter)
+FResourceFile *CheckDir(const char *filename, bool nosubdirflag, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	auto rf = new FDirectory(filename, nosubdirflag);
-	if (rf->Open(quiet, filter)) return rf;
+	if (rf->Open(filter, Printf)) return rf;
 	delete rf;
 	return nullptr;
 }

src/common/filesystem/file_grp.cpp

@@ -34,7 +34,6 @@
 */
 
 #include "resourcefile.h"
-#include "printf.h"
 
 //==========================================================================
 //
@@ -72,7 +71,7 @@ class FGrpFile : public FUncompressedFile
 {
 public:
 	FGrpFile(const char * filename, FileReader &file);
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter);
 };
 
 
@@ -93,7 +92,7 @@ FGrpFile::FGrpFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FGrpFile::Open(bool quiet, LumpFilterInfo*)
+bool FGrpFile::Open(LumpFilterInfo* filter)
 {
 	GrpHeader header;
 
@@ -129,7 +128,7 @@ bool FGrpFile::Open(bool quiet, LumpFilterInfo*)
 //
 //==========================================================================
 
-FResourceFile *CheckGRP(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckGRP(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char head[12];
 
@@ -141,7 +140,7 @@ FResourceFile *CheckGRP(const char *filename, FileReader &file, bool quiet, Lump
 		if (!memcmp(head, "KenSilverman", 12))
 		{
 			auto rf = new FGrpFile(filename, file);
-			if (rf->Open(quiet, filter)) return rf;
+			if (rf->Open(filter)) return rf;
 
 			file = std::move(rf->Reader); // to avoid destruction of reader
 			delete rf;

src/common/filesystem/file_lump.cpp

@@ -34,7 +34,6 @@
 
 #include "resourcefile.h"
 #include "cmdlib.h"
-#include "printf.h"
 
 //==========================================================================
 //
@@ -46,7 +45,7 @@ class FLumpFile : public FUncompressedFile
 {
 public:
 	FLumpFile(const char * filename, FileReader &file);
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter);
 };
 
 
@@ -67,7 +66,7 @@ FLumpFile::FLumpFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FLumpFile::Open(bool quiet, LumpFilterInfo*)
+bool FLumpFile::Open(LumpFilterInfo*)
 {
 	FString name(ExtractFileBase(FileName, true));
 
@@ -78,10 +77,6 @@ bool FLumpFile::Open(bool quiet, LumpFilterInfo*)
 	Lumps[0].LumpSize = (int)Reader.GetLength();
 	Lumps[0].Flags = 0;
 	NumLumps = 1;
-	if (!quiet)
-	{
-		Printf("\n");
-	}
 	return true;
 }
 
@@ -91,11 +86,11 @@ bool FLumpFile::Open(bool quiet, LumpFilterInfo*)
 //
 //==========================================================================
 
-FResourceFile *CheckLump(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckLump(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	// always succeeds
 	auto rf = new FLumpFile(filename, file);
-	if (rf->Open(quiet, filter)) return rf;
+	if (rf->Open(filter)) return rf;
 	file = std::move(rf->Reader); // to avoid destruction of reader
 	delete rf;
 	return NULL;

src/common/filesystem/file_pak.cpp

@@ -33,7 +33,6 @@
 */
 
 #include "resourcefile.h"
-#include "printf.h"
 
 //==========================================================================
 //
@@ -65,7 +64,7 @@ class FPakFile : public FUncompressedFile
 {
 public:
 	FPakFile(const char * filename, FileReader &file);
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter);
 };
 
 
@@ -88,7 +87,7 @@ FPakFile::FPakFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FPakFile::Open(bool quiet, LumpFilterInfo* filter)
+bool FPakFile::Open(LumpFilterInfo* filter)
 {
 	dpackheader_t header;
 
@@ -123,7 +122,7 @@ bool FPakFile::Open(bool quiet, LumpFilterInfo* filter)
 //
 //==========================================================================
 
-FResourceFile *CheckPak(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckPak(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char head[4];
 
@@ -135,7 +134,7 @@ FResourceFile *CheckPak(const char *filename, FileReader &file, bool quiet, Lump
 		if (!memcmp(head, "PACK", 4))
 		{
 			auto rf = new FPakFile(filename, file);
-			if (rf->Open(quiet, filter)) return rf;
+			if (rf->Open(filter)) return rf;
 
 			file = std::move(rf->Reader); // to avoid destruction of reader
 			delete rf;

src/common/filesystem/file_rff.cpp

@@ -35,8 +35,6 @@
 
 #include "resourcefile.h"
 
-#include "printf.h"
-
 //==========================================================================
 //
 //
@@ -111,7 +109,7 @@ class FRFFFile : public FResourceFile
 public:
 	FRFFFile(const char * filename, FileReader &file);
 	virtual ~FRFFFile();
-	virtual bool Open(bool quiet, LumpFilterInfo* filter);
+	virtual bool Open(LumpFilterInfo* filter);
 	virtual FResourceLump *GetLump(int no) { return ((unsigned)no < NumLumps)? &Lumps[no] : NULL; }
 };
 
@@ -134,7 +132,7 @@ FRFFFile::FRFFFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FRFFFile::Open(bool quiet, LumpFilterInfo*)
+bool FRFFFile::Open(LumpFilterInfo*)
 {
 	RFFLump *lumps;
 	RFFInfo header;
@@ -237,7 +235,7 @@ int FRFFLump::FillCache()
 //
 //==========================================================================
 
-FResourceFile *CheckRFF(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckRFF(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char head[4];
 
@@ -249,7 +247,7 @@ FResourceFile *CheckRFF(const char *filename, FileReader &file, bool quiet, Lump
 		if (!memcmp(head, "RFF\x1a", 4))
 		{
 			auto rf = new FRFFFile(filename, file);
-			if (rf->Open(quiet, filter)) return rf;
+			if (rf->Open(filter)) return rf;
 
 			file = std::move(rf->Reader); // to avoid destruction of reader
 			delete rf;

src/common/filesystem/file_ssi.cpp

@@ -34,7 +34,6 @@
 */
 
 #include "resourcefile.h"
-#include "printf.h"
 
 //==========================================================================
 //
@@ -46,7 +45,7 @@ class FSSIFile : public FUncompressedFile
 {
 public:
 	FSSIFile(const char * filename, FileReader &file);
-	bool Open(bool quiet, int version, int lumpcount, LumpFilterInfo* filter);
+	bool Open(int version, int lumpcount, LumpFilterInfo* filter);
 };
 
 
@@ -68,7 +67,7 @@ FSSIFile::FSSIFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FSSIFile::Open(bool quiet, int version, int lumpcount, LumpFilterInfo*)
+bool FSSIFile::Open(int version, int lumpcount, LumpFilterInfo*)
 {
 	NumLumps = lumpcount*2;
 	Lumps.Resize(lumpcount*2);
@@ -115,7 +114,7 @@ bool FSSIFile::Open(bool quiet, int version, int lumpcount, LumpFilterInfo*)
 //
 //==========================================================================
 
-FResourceFile* CheckSSI(const char* filename, FileReader& file, bool quiet, LumpFilterInfo* filter)
+FResourceFile* CheckSSI(const char* filename, FileReader& file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char zerobuf[72];
 	char buf[72];
@@ -146,7 +145,7 @@ FResourceFile* CheckSSI(const char* filename, FileReader& file, bool quiet, Lump
 				if (!skipstring(70)) return nullptr;
 			}
 			auto ssi = new FSSIFile(filename, file);
-			if (ssi->Open(filename, version, numfiles, filter)) return ssi;
+			if (ssi->Open(version, numfiles, filter)) return ssi;
 			file = std::move(ssi->Reader); // to avoid destruction of reader
 			delete ssi;
 		}

src/common/filesystem/file_wad.cpp

@@ -35,7 +35,6 @@
 
 #include <ctype.h>
 #include "resourcefile.h"
-#include "v_text.h"
 #include "filesystem.h"
 #include "engineerrors.h"
 
@@ -125,13 +124,13 @@ class FWadFile : public FResourceFile
 	TArray<FWadFileLump> Lumps;
 
 	bool IsMarker(int lump, const char *marker);
-	void SetNamespace(const char *startmarker, const char *endmarker, namespace_t space, bool flathack=false);
+	void SetNamespace(const char *startmarker, const char *endmarker, namespace_t space, FileSystemMessageFunc Printf, bool flathack=false);
-	void SkinHack ();
+	void SkinHack (FileSystemMessageFunc Printf);
 
 public:
 	FWadFile(const char * filename, FileReader &file);
 	FResourceLump *GetLump(int lump) { return &Lumps[lump]; }
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 };
 
 
@@ -154,7 +153,7 @@ FWadFile::FWadFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FWadFile::Open(bool quiet, LumpFilterInfo*)
+bool FWadFile::Open(LumpFilterInfo*, FileSystemMessageFunc Printf)
 {
 	wadinfo_t header;
 	uint32_t InfoTableOfs;
@@ -176,7 +175,8 @@ bool FWadFile::Open(bool quiet, LumpFilterInfo*)
 		// Check again to detect broken wads
 		if (InfoTableOfs + NumLumps*sizeof(wadlump_t) > (unsigned)wadSize)
 		{
-			I_Error("Cannot load broken WAD file %s\n", FileName.GetChars());
+			Printf(FSMessageLevel::Error, "%s: Bad directory offset.\n", FileName.GetChars());
+			return false;
 		}
 	}
 
@@ -212,7 +212,7 @@ bool FWadFile::Open(bool quiet, LumpFilterInfo*)
 		{
 			if (Lumps[i].LumpSize != 0)
 			{
-				Printf(PRINT_HIGH, "%s: Lump %s contains invalid positioning info and will be ignored\n", FileName.GetChars(), Lumps[i].getName());
+				Printf(FSMessageLevel::Warning, "%s: Lump %s contains invalid positioning info and will be ignored\n", FileName.GetChars(), Lumps[i].getName());
 				Lumps[i].LumpNameSetup("");
 			}
 			Lumps[i].LumpSize = Lumps[i].Position = 0;
@@ -221,18 +221,15 @@ bool FWadFile::Open(bool quiet, LumpFilterInfo*)
 
 	GenerateHash(); // Do this before the lump processing below.
 
-	if (!quiet)	// don't bother with namespaces in quiet mode. We won't need them.
+	SetNamespace("S_START", "S_END", ns_sprites, Printf);
-	{
+	SetNamespace("F_START", "F_END", ns_flats, Printf, true);
-		SetNamespace("S_START", "S_END", ns_sprites);
+	SetNamespace("C_START", "C_END", ns_colormaps, Printf);
-		SetNamespace("F_START", "F_END", ns_flats, true);
+	SetNamespace("A_START", "A_END", ns_acslibrary, Printf);
-		SetNamespace("C_START", "C_END", ns_colormaps);
+	SetNamespace("TX_START", "TX_END", ns_newtextures, Printf);
-		SetNamespace("A_START", "A_END", ns_acslibrary);
+	SetNamespace("V_START", "V_END", ns_strifevoices, Printf);
-		SetNamespace("TX_START", "TX_END", ns_newtextures);
+	SetNamespace("HI_START", "HI_END", ns_hires, Printf);
-		SetNamespace("V_START", "V_END", ns_strifevoices);
+	SetNamespace("VX_START", "VX_END", ns_voxels, Printf);
-		SetNamespace("HI_START", "HI_END", ns_hires);
+	SkinHack(Printf);
-		SetNamespace("VX_START", "VX_END", ns_voxels);
-		SkinHack();
-	}
 	return true;
 }
 
@@ -273,7 +270,7 @@ struct Marker
 	unsigned int index;
 };
 
-void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, namespace_t space, bool flathack)
+void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, namespace_t space, FileSystemMessageFunc Printf, bool flathack)
 {
 	bool warned = false;
 	int numstartmarkers = 0, numendmarkers = 0;
@@ -300,7 +297,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 	{
 		if (numendmarkers == 0) return;	// no markers found
 
-		Printf(TEXTCOLOR_YELLOW"WARNING: %s marker without corresponding %s found.\n", endmarker, startmarker);
+		Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", FileName.GetChars(), endmarker, startmarker);
 
 
 		if (flathack)
@@ -314,7 +311,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 				{
 					// We can't add this to the flats namespace but 
 					// it needs to be flagged for the texture manager.
-					DPrintf(DMSG_NOTIFY, "Marking %s as potential flat\n", Lumps[ii].getName());
+					Printf(FSMessageLevel::DebugNotify, "%s: Marking %s as potential flat\n", FileName.GetChars(), Lumps[ii].getName());
 					Lumps[ii].Flags |= LUMPF_MAYBEFLAT;
 				}
 			}
@@ -328,7 +325,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		int start, end;
 		if (markers[i].markertype != 0)
 		{
-			Printf(TEXTCOLOR_YELLOW"WARNING: %s marker without corresponding %s found.\n", endmarker, startmarker);
+			Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", FileName.GetChars(), endmarker, startmarker);
 			i++;
 			continue;
 		}
@@ -337,21 +334,21 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		// skip over subsequent x_START markers
 		while (i < markers.Size() && markers[i].markertype == 0)
 		{
-			Printf(TEXTCOLOR_YELLOW"WARNING: duplicate %s marker found.\n", startmarker);
+			Printf(FSMessageLevel::Warning, "%s: duplicate %s marker found.\n", FileName.GetChars(), startmarker);
 			i++;
 			continue;
 		}
 		// same for x_END markers
 		while (i < markers.Size()-1 && (markers[i].markertype == 1 && markers[i+1].markertype == 1))
 		{
-			Printf(TEXTCOLOR_YELLOW"WARNING: duplicate %s marker found.\n", endmarker);
+			Printf(FSMessageLevel::Warning, "%s: duplicate %s marker found.\n", FileName.GetChars(), endmarker);
 			i++;
 			continue;
 		}
 		// We found a starting marker but no end marker. Ignore this block.
 		if (i >= markers.Size())
 		{
-			Printf(TEXTCOLOR_YELLOW"WARNING: %s marker without corresponding %s found.\n", startmarker, endmarker);
+			Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", FileName.GetChars(), startmarker, endmarker);
 			end = NumLumps;
 		}
 		else
@@ -360,14 +357,14 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		}
 
 		// we found a marked block
-		DPrintf(DMSG_NOTIFY, "Found %s block at (%d-%d)\n", startmarker, markers[start].index, end);
+		Printf(FSMessageLevel::DebugNotify, "%s: Found %s block at (%d-%d)\n", FileName.GetChars(), startmarker, markers[start].index, end);
 		for(int j = markers[start].index + 1; j < end; j++)
 		{
 			if (Lumps[j].Namespace != ns_global)
 			{
 				if (!warned)
 				{
-					Printf(TEXTCOLOR_YELLOW"WARNING: Overlapping namespaces found (lump %d)\n", j);
+					Printf(FSMessageLevel::Warning, "%s: Overlapping namespaces found (lump %d)\n", FileName.GetChars(), j);
 				}
 				warned = true;
 			}
@@ -377,7 +374,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 				// ignore sprite lumps smaller than 8 bytes (the smallest possible)
 				// in size -- this was used by some dmadds wads
 				// as an 'empty' graphics resource
-				DPrintf(DMSG_WARNING, " Skipped empty sprite %s (lump %d)\n", Lumps[j].getName(), j);
+				Printf(FSMessageLevel::DebugWarn, "%s: Skipped empty sprite %s (lump %d)\n", FileName.GetChars(), Lumps[j].getName(), j);
 			}
 			else
 			{
@@ -401,7 +398,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 //
 //==========================================================================
 
-void FWadFile::SkinHack ()
+void FWadFile::SkinHack (FileSystemMessageFunc Printf)
 {
 	// this being static is not a problem. The only relevant thing is that each skin gets a different number.
 	static int namespc = ns_firstskin;
@@ -447,11 +444,8 @@ void FWadFile::SkinHack ()
 	}
 	if (skinned && hasmap)
 	{
-		Printf (TEXTCOLOR_BLUE
+		Printf(FSMessageLevel::Attention, "%s: The maps will not be loaded because it has a skin.\n", FileName.GetChars());
-			"The maps in %s will not be loaded because it has a skin.\n"
+		Printf(FSMessageLevel::Attention, "You should remove the skin from the wad to play these maps.\n");
-			TEXTCOLOR_BLUE
-			"You should remove the skin from the wad to play these maps.\n",
-			FileName.GetChars());
 	}
 }
 
@@ -462,7 +456,7 @@ void FWadFile::SkinHack ()
 //
 //==========================================================================
 
-FResourceFile *CheckWad(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckWad(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char head[4];
 
@@ -474,7 +468,7 @@ FResourceFile *CheckWad(const char *filename, FileReader &file, bool quiet, Lump
 		if (!memcmp(head, "IWAD", 4) || !memcmp(head, "PWAD", 4))
 		{
 			auto rf = new FWadFile(filename, file);
-			if (rf->Open(quiet, filter)) return rf;
+			if (rf->Open(filter, Printf)) return rf;
 
 			file = std::move(rf->Reader); // to avoid destruction of reader
 			delete rf;

src/common/filesystem/file_whres.cpp

@@ -35,7 +35,6 @@
 */
 
 #include "resourcefile.h"
-#include "printf.h"
 #include "cmdlib.h"
 
 //==========================================================================
@@ -68,7 +67,7 @@ class FWHResFile : public FUncompressedFile
 	FString basename;
 public:
 	FWHResFile(const char * filename, FileReader &file);
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter);
 };
 
 
@@ -92,7 +91,7 @@ FWHResFile::FWHResFile(const char *filename, FileReader &file)
 //
 //==========================================================================
 
-bool FWHResFile::Open(bool quiet, LumpFilterInfo*)
+bool FWHResFile::Open(LumpFilterInfo*)
 {
 	int directory[1024];
 
@@ -129,7 +128,7 @@ bool FWHResFile::Open(bool quiet, LumpFilterInfo*)
 //
 //==========================================================================
 
-FResourceFile *CheckWHRes(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckWHRes(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	if (file.GetLength() >= 8192) // needs to be at least 8192 to contain one file and the directory.
 	{
@@ -149,7 +148,7 @@ FResourceFile *CheckWHRes(const char *filename, FileReader &file, bool quiet, Lu
 			checkpos += (length+4095) / 4096;
 		}
 		auto rf = new FWHResFile(filename, file);
-		if (rf->Open(quiet, filter)) return rf;
+		if (rf->Open(filter)) return rf;
 		file = std::move(rf->Reader); // to avoid destruction of reader
 		delete rf;
 	}

src/common/filesystem/file_zip.cpp

@@ -37,7 +37,6 @@
 #include "file_zip.h"
 #include "cmdlib.h"
 
-#include "printf.h"
 #include "w_zip.h"
 
 #include "ancientzip.h"
@@ -51,8 +50,6 @@
 //==========================================================================
 
 static bool UncompressZipLump(char *Cache, FileReader &Reader, int Method, int LumpSize, int CompressedSize, int GPFlags)
-{
-	try
 {
 	switch (Method)
 	{
@@ -92,12 +89,6 @@ static bool UncompressZipLump(char *Cache, FileReader &Reader, int Method, int L
 		assert(0);
 		return false;
 	}
-	}
-	catch (CRecoverableError &err)
-	{
-		Printf("%s\n", err.GetMessage());
-		return false;
-	}
 	return true;
 }
 
@@ -173,7 +164,7 @@ FZipFile::FZipFile(const char * filename, FileReader &file)
 	Lumps = NULL;
 }
 
-bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
+bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	bool zip64 = false;
 	uint32_t centraldir = Zip_FindCentralDir(Reader, &zip64);
@@ -183,7 +174,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 
 	if (centraldir == 0)
 	{
-		if (!quiet) Printf(TEXTCOLOR_RED "\n%s: ZIP file corrupt!\n", FileName.GetChars());
+		Printf(FSMessageLevel::Error, "%s: ZIP file corrupt!\n", FileName.GetChars());
 		return false;
 	}
 
@@ -199,7 +190,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 		if (info.NumEntries != info.NumEntriesOnAllDisks ||
 			info.FirstDisk != 0 || info.DiskNumber != 0)
 		{
-			if (!quiet) Printf(TEXTCOLOR_RED "\n%s: Multipart Zip files are not supported.\n", FileName.GetChars());
+			Printf(FSMessageLevel::Error, "%s: Multipart Zip files are not supported.\n", FileName.GetChars());
 			return false;
 		}
 		
@@ -218,7 +209,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 		if (info.NumEntries != info.NumEntriesOnAllDisks ||
 			info.FirstDisk != 0 || info.DiskNumber != 0)
 		{
-			if (!quiet) Printf(TEXTCOLOR_RED "\n%s: Multipart Zip files are not supported.\n", FileName.GetChars());
+			Printf(FSMessageLevel::Error, "%s: Multipart Zip files are not supported.\n", FileName.GetChars());
 			return false;
 		}
 		
@@ -257,7 +248,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 		if (dirptr > ((char*)directory) + dirsize)	// This directory entry goes beyond the end of the file.
 		{
 			free(directory);
-			if (!quiet) Printf(TEXTCOLOR_RED "\n%s: Central directory corrupted.", FileName.GetChars());
+			Printf(FSMessageLevel::Error, "%s: Central directory corrupted.", FileName.GetChars());
 			return false;
 		}
 
@@ -323,7 +314,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 		if (dirptr > ((char*)directory) + dirsize)	// This directory entry goes beyond the end of the file.
 		{
 			free(directory);
-			if (!quiet) Printf(TEXTCOLOR_RED "\n%s: Central directory corrupted.", FileName.GetChars());
+			Printf(FSMessageLevel::Error, "%s: Central directory corrupted.", FileName.GetChars());
 			return false;
 		}
 
@@ -350,7 +341,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 			zip_fh->Method != METHOD_IMPLODE &&
 			zip_fh->Method != METHOD_SHRINK)
 		{
-			if (!quiet) Printf(TEXTCOLOR_YELLOW "\n%s: '%s' uses an unsupported compression algorithm (#%d).\n", FileName.GetChars(), name.GetChars(), zip_fh->Method);
+			Printf(FSMessageLevel::Error, "%s: '%s' uses an unsupported compression algorithm (#%d).\n", FileName.GetChars(), name.GetChars(), zip_fh->Method);
 			skipped++;
 			continue;
 		}
@@ -358,7 +349,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 		zip_fh->Flags = LittleShort(zip_fh->Flags);
 		if (zip_fh->Flags & ZF_ENCRYPTED)
 		{
-			if (!quiet) Printf(TEXTCOLOR_YELLOW "\n%s: '%s' is encrypted. Encryption is not supported.\n", FileName.GetChars(), name.GetChars());
+			Printf(FSMessageLevel::Error, "%s: '%s' is encrypted. Encryption is not supported.\n", FileName.GetChars(), name.GetChars());
 			skipped++;
 			continue;
 		}
@@ -385,7 +376,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 					if (zip_64->CompressedSize > 0x7fffffff || zip_64->UncompressedSize > 0x7fffffff)
 					{
 						// The file system is limited to 32 bit file sizes;
-						if (!quiet) Printf(TEXTCOLOR_YELLOW "\n%s: '%s' is too large.\n", FileName.GetChars(), name.GetChars());
+						Printf(FSMessageLevel::Warning, "%s: '%s' is too large.\n", FileName.GetChars(), name.GetChars());
 						skipped++;
 						continue;
 					}
@@ -508,7 +499,16 @@ int FZipLump::FillCache()
 
 	Owner->Reader.Seek(Position, FileReader::SeekSet);
 	Cache = new char[LumpSize];
+	try
+	{
 		UncompressZipLump(Cache, Owner->Reader, Method, LumpSize, CompressedSize, GPFlags);
+	}
+	catch (const CRecoverableError& )
+	{
+		// this cannot propagate the exception but also has no means to handle the error message. Damn...
+		// At least don't return uninitialized memory here.
+		memset(Cache, 0, LumpSize);
+	}
 	RefCount = 1;
 	return 1;
 }
@@ -532,7 +532,7 @@ int FZipLump::GetFileOffset()
 //
 //==========================================================================
 
-FResourceFile *CheckZip(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+FResourceFile *CheckZip(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	char head[4];
 
@@ -544,7 +544,7 @@ FResourceFile *CheckZip(const char *filename, FileReader &file, bool quiet, Lump
 		if (!memcmp(head, "PK\x3\x4", 4))
 		{
 			auto rf = new FZipFile(filename, file);
-			if (rf->Open(quiet, filter)) return rf;
+			if (rf->Open(filter, Printf)) return rf;
 
 			file = std::move(rf->Reader); // to avoid destruction of reader
 			delete rf;

src/common/filesystem/file_zip.h

@@ -41,7 +41,7 @@ class FZipFile : public FResourceFile
 public:
 	FZipFile(const char * filename, FileReader &file);
 	virtual ~FZipFile();
-	bool Open(bool quiet, LumpFilterInfo* filter);
+	bool Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 	virtual FResourceLump *GetLump(int no) { return ((unsigned)no < NumLumps)? &Lumps[no] : NULL; }
 };
 

src/common/filesystem/filesystem.cpp

@@ -152,7 +152,7 @@ struct FileSystem::LumpRecord
 
 // PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
 
-static void PrintLastError ();
+static void PrintLastError (FileSystemMessageFunc Printf);
 
 // PUBLIC DATA DEFINITIONS -------------------------------------------------
 
@@ -162,7 +162,7 @@ FileSystem fileSystem;
 
 FileSystem::FileSystem()
 {
-	// This is needed to initialize the LumpRecord array, which depends on data only available here.
+	// Cannot be defaulted! This is needed to initialize the LumpRecord array, which depends on data only available here.
 }
 
 FileSystem::~FileSystem ()
@@ -199,14 +199,14 @@ void FileSystem::DeleteAll ()
 //
 //==========================================================================
 
-void FileSystem::InitSingleFile(const char* filename, bool quiet)
+bool FileSystem::InitSingleFile(const char* filename, FileSystemMessageFunc Printf)
 {
 	TArray<FString> filenames;
 	filenames.Push(filename);
-	InitMultipleFiles(filenames, true);
+	return InitMultipleFiles(filenames, nullptr, Printf);
 }
 
-void FileSystem::InitMultipleFiles (TArray<FString> &filenames, bool quiet, LumpFilterInfo* filter, bool allowduplicates, FILE* hashfile)
+bool FileSystem::InitMultipleFiles (TArray<FString> &filenames, LumpFilterInfo* filter, FileSystemMessageFunc Printf, bool allowduplicates, FILE* hashfile)
 {
 	int numfiles;
 
@@ -232,7 +232,7 @@ void FileSystem::InitMultipleFiles (TArray<FString> &filenames, bool quiet, Lump
 
 	for(unsigned i=0;i<filenames.Size(); i++)
 	{
-		AddFile (filenames[i], nullptr, quiet, filter, hashfile);
+		AddFile (filenames[i], nullptr, filter, Printf, hashfile);
 
 		if (i == (unsigned)MaxIwadIndex) MoveLumpsInFolder("after_iwad/");
 		FStringf path("filter/%s", Files.Last()->GetHash().GetChars());
@@ -242,13 +242,13 @@ void FileSystem::InitMultipleFiles (TArray<FString> &filenames, bool quiet, Lump
 	NumEntries = FileInfo.Size();
 	if (NumEntries == 0)
 	{
-		if (!quiet) I_FatalError("W_InitMultipleFiles: no files found");
+		return false;
-		else return;
 	}
 	if (filter && filter->postprocessFunc) filter->postprocessFunc();
 
 	// [RH] Set up hash table
 	InitHashChains ();
+	return true;
 }
 
 //==========================================================================
@@ -308,7 +308,7 @@ int FileSystem::AddFromBuffer(const char* name, const char* type, char* data, in
 // [RH] Removed reload hack
 //==========================================================================
 
-void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, LumpFilterInfo* filter, FILE* hashfile)
+void FileSystem::AddFile (const char *filename, FileReader *filer, LumpFilterInfo* filter, FileSystemMessageFunc Printf, FILE* hashfile)
 {
 	int startlump;
 	bool isdir = false;
@@ -319,10 +319,10 @@ void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, L
 		// Does this exist? If so, is it a directory?
 		if (!DirEntryExists(filename, &isdir))
 		{
-			if (!quiet)
+			if (Printf)
 			{
-				Printf(TEXTCOLOR_RED "%s: File or Directory not found\n", filename);
+				Printf(FSMessageLevel::Error, "%s: File or Directory not found\n", filename);
-				PrintLastError();
+				PrintLastError(Printf);
 			}
 			return;
 		}
@@ -331,10 +331,10 @@ void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, L
 		{
 			if (!filereader.OpenFile(filename))
 			{ // Didn't find file
-				if (!quiet)
+				if (Printf)
 				{
-					Printf(TEXTCOLOR_RED "%s: File not found\n", filename);
+					Printf(FSMessageLevel::Error, "%s: File not found\n", filename);
-					PrintLastError();
+					PrintLastError(Printf);
 				}
 				return;
 			}
@@ -342,19 +342,20 @@ void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, L
 	}
 	else filereader = std::move(*filer);
 
-	if (!batchrun && !quiet) Printf (" adding %s", filename);
 	startlump = NumEntries;
 
 	FResourceFile *resfile;
 
+
 	if (!isdir)
-		resfile = FResourceFile::OpenResourceFile(filename, filereader, quiet, false, filter);
+		resfile = FResourceFile::OpenResourceFile(filename, filereader, false, filter, Printf);
 	else
-		resfile = FResourceFile::OpenDirectory(filename, quiet, filter);
+		resfile = FResourceFile::OpenDirectory(filename, filter, Printf);
 
 	if (resfile != NULL)
 	{
-		if (!quiet && !batchrun) Printf(", %d lumps\n", resfile->LumpCount());
+		if (!batchrun && Printf) 
+			Printf(FSMessageLevel::Message, "adding %s, %d lumps\n", filename, resfile->LumpCount());
 
 		uint32_t lumpstart = FileInfo.Size();
 
@@ -376,11 +377,11 @@ void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, L
 				FString path;
 				path.Format("%s:%s", filename, lump->getName());
 				auto embedded = lump->NewReader();
-				AddFile(path, &embedded, quiet, filter, hashfile);
+				AddFile(path, &embedded, filter, Printf, hashfile);
 			}
 		}
 
-		if (hashfile && !quiet)
+		if (hashfile)
 		{
 			uint8_t cksum[16];
 			char cksumout[33];
@@ -1647,7 +1648,7 @@ __declspec(dllimport) void * __stdcall LocalFree (void *);
 __declspec(dllimport) unsigned long __stdcall GetLastError ();
 }
 
-static void PrintLastError ()
+static void PrintLastError (FileSystemMessageFunc Printf)
 {
 	char *lpMsgBuf;
 	FormatMessageA(0x1300 /*FORMAT_MESSAGE_ALLOCATE_BUFFER | 
@@ -1660,14 +1661,14 @@ static void PrintLastError ()
 		0,
 		NULL 
 	);
-	Printf (TEXTCOLOR_RED "  %s\n", lpMsgBuf);
+	Printf (FSMessageLevel::Error, "  %s\n", lpMsgBuf);
 	// Free the buffer.
 	LocalFree( lpMsgBuf );
 }
 #else
-static void PrintLastError ()
+static void PrintLastError (FileSystemMessageFunc Printf)
 {
-	Printf (TEXTCOLOR_RED "  %s\n", strerror(errno));
+	Printf(FSMessageLevel::Error, "  %s\n", strerror(errno));
 }
 #endif
 
@@ -1681,21 +1682,3 @@ FResourceLump* FileSystem::GetFileAt(int no)
 {
 	return FileInfo[no].lump;
 }
-
-#include "c_dispatch.h"
-
-CCMD(fs_dir)
-{
-	int numfiles = fileSystem.GetNumEntries();
-
-	for (int i = 0; i < numfiles; i++)
-	{
-		auto container = fileSystem.GetResourceFileFullName(fileSystem.GetFileContainer(i));
-		auto fn1 = fileSystem.GetFileFullName(i);
-		auto fns = fileSystem.GetFileShortName(i);
-		auto fnid = fileSystem.GetResourceId(i);
-		auto length = fileSystem.FileLength(i);
-		bool hidden = fileSystem.FindFile(fn1) != i;
-		Printf(PRINT_HIGH | PRINT_NONOTIFY, "%s%-64s %-15s (%5d) %10d %s %s\n", hidden ? TEXTCOLOR_RED : TEXTCOLOR_UNTRANSLATED, fn1, fns, fnid, length, container, hidden ? "(h)" : "");
-	}
-}

src/common/filesystem/filesystem.h

@@ -67,9 +67,9 @@ public:
 	int GetMaxIwadNum() { return MaxIwadIndex; }
 	void SetMaxIwadNum(int x) { MaxIwadIndex = x; }
 
-	void InitSingleFile(const char *filename, bool quiet = false);
+	bool InitSingleFile(const char *filename, FileSystemMessageFunc Printf = nullptr);
-	void InitMultipleFiles (TArray<FString> &filenames, bool quiet = false, LumpFilterInfo* filter = nullptr, bool allowduplicates = false, FILE* hashfile = nullptr);
+	bool InitMultipleFiles (TArray<FString> &filenames, LumpFilterInfo* filter = nullptr, FileSystemMessageFunc Printf = nullptr, bool allowduplicates = false, FILE* hashfile = nullptr);
-	void AddFile (const char *filename, FileReader *wadinfo, bool quiet, LumpFilterInfo* filter, FILE* hashfile);
+	void AddFile (const char *filename, FileReader *wadinfo, LumpFilterInfo* filter, FileSystemMessageFunc Printf, FILE* hashfile);
 	int CheckIfResourceFileLoaded (const char *name) noexcept;
 	void AddAdditionalFile(const char* filename, FileReader* wadinfo = NULL) {}
 

src/common/filesystem/resourcefile.cpp

@@ -223,46 +223,54 @@ int FResourceLump::Unlock()
 //
 //==========================================================================
 
-typedef FResourceFile * (*CheckFunc)(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter);
+typedef FResourceFile * (*CheckFunc)(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 
-FResourceFile *CheckWad(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile *CheckWad(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *CheckGRP(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile *CheckGRP(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *CheckRFF(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile *CheckRFF(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *CheckPak(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile *CheckPak(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *CheckZip(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile *CheckZip(const char *filename, FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *Check7Z(const char *filename,  FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile *Check7Z(const char *filename,  FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile* CheckSSI(const char* filename, FileReader& file, bool quiet, LumpFilterInfo* filter);
+FResourceFile* CheckSSI(const char* filename, FileReader& file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *CheckLump(const char *filename,FileReader &file, bool quiet, LumpFilterInfo* filter);
+FResourceFile* CheckWHRes(const char* filename, FileReader& file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
-FResourceFile *CheckDir(const char *filename, bool quiet, bool nosub, LumpFilterInfo* filter);
+FResourceFile *CheckLump(const char *filename,FileReader &file, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
+FResourceFile *CheckDir(const char *filename, bool nosub, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 
-static CheckFunc funcs[] = { CheckWad, CheckZip, Check7Z, CheckPak, CheckGRP, CheckRFF, CheckSSI, CheckLump };
+static CheckFunc funcs[] = { CheckWad, CheckZip, Check7Z, CheckPak, CheckGRP, CheckRFF, CheckSSI, CheckWHRes, CheckLump };
 
-FResourceFile *FResourceFile::DoOpenResourceFile(const char *filename, FileReader &file, bool quiet, bool containeronly, LumpFilterInfo* filter)
+static int nulPrintf(FSMessageLevel msg, const char* fmt, ...)
 {
+	return 0;
+}
+
+FResourceFile *FResourceFile::DoOpenResourceFile(const char *filename, FileReader &file, bool containeronly, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
+{
+	if (Printf == nullptr) Printf = nulPrintf;
 	for(size_t i = 0; i < countof(funcs) - containeronly; i++)
 	{
-		FResourceFile *resfile = funcs[i](filename, file, quiet, filter);
+		FResourceFile *resfile = funcs[i](filename, file, filter, Printf);
 		if (resfile != NULL) return resfile;
 	}
 	return NULL;
 }
 
-FResourceFile *FResourceFile::OpenResourceFile(const char *filename, FileReader &file, bool quiet, bool containeronly, LumpFilterInfo* filter)
+FResourceFile *FResourceFile::OpenResourceFile(const char *filename, FileReader &file, bool containeronly, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
-	return DoOpenResourceFile(filename, file, quiet, containeronly, filter);
+	return DoOpenResourceFile(filename, file, containeronly, filter, Printf);
 }
 
 
-FResourceFile *FResourceFile::OpenResourceFile(const char *filename, bool quiet, bool containeronly, LumpFilterInfo* filter)
+FResourceFile *FResourceFile::OpenResourceFile(const char *filename, bool containeronly, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
 	FileReader file;
 	if (!file.OpenFile(filename)) return nullptr;
-	return DoOpenResourceFile(filename, file, quiet, containeronly, filter);
+	return DoOpenResourceFile(filename, file, containeronly, filter, Printf);
 }
 
-FResourceFile *FResourceFile::OpenDirectory(const char *filename, bool quiet, LumpFilterInfo* filter)
+FResourceFile *FResourceFile::OpenDirectory(const char *filename, LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
-	return CheckDir(filename, quiet, false, filter);
+	if (Printf == nullptr) Printf = nulPrintf;
+	return CheckDir(filename, false, filter, Printf);
 }
 
 //==========================================================================

src/common/filesystem/resourcefile.h

@@ -8,6 +8,7 @@
 #include "files.h"
 #include "zstring.h"
 
+// user context in which the file system gets opened. This also contains a few callbacks to avoid direct dependencies on the engine.
 struct LumpFilterInfo
 {
 	TArray<FString> gameTypeFilter;	// this can contain multiple entries
@@ -20,6 +21,20 @@ struct LumpFilterInfo
 	std::function<void()> postprocessFunc;
 };
 
+enum class FSMessageLevel
+{
+	Error = 1,
+	Warning = 2,
+	Attention = 3,
+	Message = 4,
+	DebugWarn = 5,
+	DebugNotify = 6,
+};
+
+// pass the text output function as parameter to avoid a hard dependency on higher level code.
+using FileSystemMessageFunc = int(*)(FSMessageLevel msglevel, const char* format, ...);
+
+
 class FResourceFile;
 
 // [RH] Namespaces from BOOM.
@@ -151,12 +166,12 @@ private:
 	int FilterLumpsByGameType(LumpFilterInfo *filter, void *lumps, size_t lumpsize, uint32_t max);
 	bool FindPrefixRange(FString filter, void *lumps, size_t lumpsize, uint32_t max, uint32_t &start, uint32_t &end);
 	void JunkLeftoverFilters(void *lumps, size_t lumpsize, uint32_t max);
-	static FResourceFile *DoOpenResourceFile(const char *filename, FileReader &file, bool quiet, bool containeronly, LumpFilterInfo* filter);
+	static FResourceFile *DoOpenResourceFile(const char *filename, FileReader &file, bool containeronly, LumpFilterInfo* filter, FileSystemMessageFunc Printf);
 
 public:
-	static FResourceFile *OpenResourceFile(const char *filename, FileReader &file, bool quiet = false, bool containeronly = false, LumpFilterInfo* filter = nullptr);
+	static FResourceFile *OpenResourceFile(const char *filename, FileReader &file, bool containeronly = false, LumpFilterInfo* filter = nullptr, FileSystemMessageFunc Printf = nullptr);
-	static FResourceFile *OpenResourceFile(const char *filename, bool quiet = false, bool containeronly = false, LumpFilterInfo* filter = nullptr);
+	static FResourceFile *OpenResourceFile(const char *filename, bool containeronly = false, LumpFilterInfo* filter = nullptr, FileSystemMessageFunc Printf = nullptr);
-	static FResourceFile *OpenDirectory(const char *filename, bool quiet = false, LumpFilterInfo* filter = nullptr);
+	static FResourceFile *OpenDirectory(const char *filename, LumpFilterInfo* filter = nullptr, FileSystemMessageFunc Printf = nullptr);
 	virtual ~FResourceFile();
     // If this FResourceFile represents a directory, the Reader object is not usable so don't return it.
     FileReader *GetReader() { return Reader.isOpen()? &Reader : nullptr; }

src/common/utility/files_decompress.cpp

@@ -43,7 +43,6 @@
 
 #include "files.h"
 
-#include "zstring.h"
 #include "cmdlib.h"
 
 //==========================================================================

src/d_iwad.cpp

@@ -308,8 +308,7 @@ FIWadManager::FIWadManager(const char *firstfn, const char *optfn)
 	fns.Push(firstfn);
 	if (optfn) fns.Push(optfn);
 
-	check.InitMultipleFiles(fns, true);
+	if (check.InitMultipleFiles(fns, nullptr, nullptr))
-	if (check.GetNumEntries() > 0)
 	{
 		int num = check.CheckNumForName("IWADINFO");
 		if (num >= 0)
@@ -331,7 +330,7 @@ FIWadManager::FIWadManager(const char *firstfn, const char *optfn)
 int FIWadManager::ScanIWAD (const char *iwad)
 {
 	FileSystem check;
-	check.InitSingleFile(iwad, true);
+	check.InitSingleFile(iwad, nullptr);
 
 	mLumpsFound.Resize(mIWadInfos.Size());
 
@@ -390,8 +389,7 @@ int FIWadManager::CheckIWADInfo(const char* fn)
 
 	TArray<FString> filenames;
 	filenames.Push(fn);
-	check.InitMultipleFiles(filenames, true, &lfi);
+	if (check.InitMultipleFiles(filenames, &lfi, nullptr))
-	if (check.GetNumEntries() > 0)
 	{
 		int num = check.CheckNumForName("IWADINFO");
 		if (num >= 0)

src/d_main.cpp

@@ -1924,8 +1924,7 @@ static FString CheckGameInfo(TArray<FString> & pwads)
 	GetReserved(lfi);
 
 	// Open the entire list as a temporary file system and look for a GAMEINFO lump. The last one will automatically win.
-	check.InitMultipleFiles(pwads, true, &lfi);
+	if (check.InitMultipleFiles(pwads, &lfi, nullptr))
-	if (check.GetNumEntries() > 0)
 	{
 		int num = check.CheckNumForName("GAMEINFO");
 		if (num >= 0)
@@ -3031,6 +3030,35 @@ static FILE* D_GetHashFile()
 	return hashfile;
 }
 
+static int FileSystemPrintf(FSMessageLevel level, const char* fmt, ...)
+{
+	va_list arg;
+	va_start(arg, fmt);
+	FString text;
+	text.VFormat(fmt, arg);
+	switch (level)
+	{
+	case FSMessageLevel::Error:
+		return Printf(TEXTCOLOR_RED "%s", text.GetChars());
+		break;
+	case FSMessageLevel::Warning:
+		Printf(TEXTCOLOR_YELLOW "%s", text.GetChars());
+		break;
+	case FSMessageLevel::Attention:
+		Printf(TEXTCOLOR_BLUE "%s", text.GetChars());
+		break;
+	case FSMessageLevel::Message:
+		Printf("%s", text.GetChars());
+		break;
+	case FSMessageLevel::DebugWarn:
+		DPrintf(DMSG_WARNING, "%s", text.GetChars());
+		break;
+	case FSMessageLevel::DebugNotify:
+		DPrintf(DMSG_NOTIFY, "%s", text.GetChars());
+		break;
+	}
+	return text.Len();
+}
 //==========================================================================
 //
 // D_InitGame
@@ -3119,7 +3147,10 @@ static int D_InitGame(const FIWADInfo* iwad_info, TArray<FString>& allwads, TArr
 
 	bool allowduplicates = Args->CheckParm("-allowduplicates");
 	auto hashfile = D_GetHashFile();
-	fileSystem.InitMultipleFiles (allwads, false, &lfi, allowduplicates, hashfile);
+	if (!fileSystem.InitMultipleFiles(allwads, &lfi, FileSystemPrintf, allowduplicates, hashfile))
+	{
+		I_FatalError("FileSystem: no files found");
+	}
 	allwads.Clear();
 	allwads.ShrinkToFit();
 	SetMapxxFlag();
@@ -3914,3 +3945,19 @@ void I_UpdateWindowTitle()
 		I_UpdateDiscordPresence(false, nullptr, nullptr, nullptr);
 	I_SetWindowTitle(copy.Data());
 }
+
+CCMD(fs_dir)
+{
+	int numfiles = fileSystem.GetNumEntries();
+
+	for (int i = 0; i < numfiles; i++)
+	{
+		auto container = fileSystem.GetResourceFileFullName(fileSystem.GetFileContainer(i));
+		auto fn1 = fileSystem.GetFileFullName(i);
+		auto fns = fileSystem.GetFileShortName(i);
+		auto fnid = fileSystem.GetResourceId(i);
+		auto length = fileSystem.FileLength(i);
+		bool hidden = fileSystem.FindFile(fn1) != i;
+		Printf(PRINT_HIGH | PRINT_NONOTIFY, "%s%-64s %-15s (%5d) %10d %s %s\n", hidden ? TEXTCOLOR_RED : TEXTCOLOR_UNTRANSLATED, fn1, fns, fnid, length, container, hidden ? "(h)" : "");
+	}
+}

src/g_game.cpp

@@ -1975,7 +1975,7 @@ void G_DoLoadGame ()
 	hidecon = gameaction == ga_loadgamehidecon;
 	gameaction = ga_nothing;
 
-	std::unique_ptr<FResourceFile> resfile(FResourceFile::OpenResourceFile(savename.GetChars(), true, true));
+	std::unique_ptr<FResourceFile> resfile(FResourceFile::OpenResourceFile(savename.GetChars(), true));
 	if (resfile == nullptr)
 	{
 		LoadGameError("TXT_COULDNOTREAD");

src/maploader/glnodes.cpp

@@ -883,7 +883,7 @@ bool MapLoader::LoadGLNodes(MapData * map)
 					strcpy(ext, ".gwa");
 					// Todo: Compare file dates
 
-					f_gwa = FResourceFile::OpenResourceFile(path, true);
+					f_gwa = FResourceFile::OpenResourceFile(path);
 					if (f_gwa==nullptr) return false;
 
 					strncpy(map->MapLumps[0].Name, fileSystem.GetFileFullName(map->lumpnum), 8);

src/menu/loadsavemenu.cpp

@@ -77,7 +77,7 @@ void FSavegameManager::ReadSaveStrings()
 				// I_FindName only returns the file's name and not its full path
 				FString filepath = G_BuildSaveName(I_FindName(&c_file));
 
-				std::unique_ptr<FResourceFile> savegame(FResourceFile::OpenResourceFile(filepath, true, true));
+				std::unique_ptr<FResourceFile> savegame(FResourceFile::OpenResourceFile(filepath, true));
 				if (savegame != nullptr)
 				{
 					bool oldVer = false;

src/p_openmap.cpp

@@ -125,7 +125,7 @@ MapData *P_OpenMapData(const char * mapname, bool justcheck)
 			delete map;
 			return NULL;
 		}
-		map->resource = FResourceFile::OpenResourceFile(mapname, true);
+		map->resource = FResourceFile::OpenResourceFile(mapname);
 		wadReader = map->resource->GetReader();
 	}
 	else