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- moved file system implementation to 'common'.

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Christoph Oelckers 2020-04-11 13:36:23 +02:00
commit 05d8856fe0
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src/common/filesystem/file_wad.cpp Normal file
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/*
** file_wad.cpp
**
**---------------------------------------------------------------------------
** Copyright 1998-2009 Randy Heit
** Copyright 2005-2009 Christoph Oelckers
** 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. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. 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.
**---------------------------------------------------------------------------
**
**
*/
#include <ctype.h>
#include "resourcefile.h"
#include "v_text.h"
#include "filesystem.h"
#include "engineerrors.h"
struct wadinfo_t
{
// Should be "IWAD" or "PWAD".
uint32_t Magic;
uint32_t NumLumps;
uint32_t InfoTableOfs;
};
struct wadlump_t
{
uint32_t FilePos;
uint32_t Size;
char Name[8];
};
//==========================================================================
//
// Wad Lump (with console doom LZSS support)
//
//==========================================================================
class FWadFileLump : public FResourceLump
{
public:
bool Compressed;
int Position;
int Namespace;
int GetNamespace() const override { return Namespace; }
int GetFileOffset() { return Position; }
FileReader *GetReader()
{
if(!Compressed)
{
Owner->Reader.Seek(Position, FileReader::SeekSet);
return &Owner->Reader;
}
return NULL;
}
int FillCache()
{
if(!Compressed)
{
const char * buffer = Owner->Reader.GetBuffer();
if (buffer != NULL)
{
// This is an in-memory file so the cache can point directly to the file's data.
Cache = const_cast<char*>(buffer) + Position;
RefCount = -1;
return -1;
}
}
Owner->Reader.Seek(Position, FileReader::SeekSet);
Cache = new char[LumpSize];
if(Compressed)
{
FileReader lzss;
if (lzss.OpenDecompressor(Owner->Reader, LumpSize, METHOD_LZSS, false, [](const char* err) { I_Error("%s", err); }))
{
lzss.Read(Cache, LumpSize);
}
}
else
Owner->Reader.Read(Cache, LumpSize);
RefCount = 1;
return 1;
}
};
//==========================================================================
//
// Wad file
//
//==========================================================================
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 SkinHack ();
public:
FWadFile(const char * filename, FileReader &file);
FResourceLump *GetLump(int lump) { return &Lumps[lump]; }
bool Open(bool quiet, LumpFilterInfo* filter);
};
//==========================================================================
//
// FWadFile::FWadFile
//
// Initializes a WAD file
//
//==========================================================================
FWadFile::FWadFile(const char *filename, FileReader &file)
: FResourceFile(filename, file)
{
}
//==========================================================================
//
// Open it
//
//==========================================================================
bool FWadFile::Open(bool quiet, LumpFilterInfo*)
{
wadinfo_t header;
uint32_t InfoTableOfs;
bool isBigEndian = false; // Little endian is assumed until proven otherwise
auto wadSize = Reader.GetLength();
Reader.Read(&header, sizeof(header));
NumLumps = LittleLong(header.NumLumps);
InfoTableOfs = LittleLong(header.InfoTableOfs);
// Check to see if the little endian interpretation is valid
// This should be sufficient to detect big endian wads.
if (InfoTableOfs + NumLumps*sizeof(wadlump_t) > (unsigned)wadSize)
{
NumLumps = BigLong(header.NumLumps);
InfoTableOfs = BigLong(header.InfoTableOfs);
isBigEndian = true;
// 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());
}
}
TArray<wadlump_t> fileinfo(NumLumps, true);
Reader.Seek (InfoTableOfs, FileReader::SeekSet);
Reader.Read (fileinfo.Data(), NumLumps * sizeof(wadlump_t));
Lumps.Resize(NumLumps);
for(uint32_t i = 0; i < NumLumps; i++)
{
char n[9];
uppercopy(n, fileinfo[i].Name);
n[8] = 0;
// This needs to be done differently. We cannot simply assume that all lumps where the first character's high bit is set are compressed without verification.
// This requires explicit toggling for precisely the files that need it.
#if 0
Lumps[i].Compressed = !(gameinfo.flags & GI_SHAREWARE) && (n[0] & 0x80) == 0x80;
#else
Lumps[i].Compressed = false;
#endif
n[0] &= ~0x80;
Lumps[i].LumpNameSetup(n);
Lumps[i].Owner = this;
Lumps[i].Position = isBigEndian ? BigLong(fileinfo[i].FilePos) : LittleLong(fileinfo[i].FilePos);
Lumps[i].LumpSize = isBigEndian ? BigLong(fileinfo[i].Size) : LittleLong(fileinfo[i].Size);
Lumps[i].Namespace = ns_global;
Lumps[i].Flags = Lumps[i].Compressed ? LUMPF_COMPRESSED | LUMPF_SHORTNAME : LUMPF_SHORTNAME;
// Check if the lump is within the WAD file and print a warning if not.
if (Lumps[i].Position + Lumps[i].LumpSize > wadSize || Lumps[i].Position < 0 || Lumps[i].LumpSize < 0)
{
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());
Lumps[i].LumpNameSetup("");
}
Lumps[i].LumpSize = Lumps[i].Position = 0;
}
}
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);
SetNamespace("F_START", "F_END", ns_flats, true);
SetNamespace("C_START", "C_END", ns_colormaps);
SetNamespace("A_START", "A_END", ns_acslibrary);
SetNamespace("TX_START", "TX_END", ns_newtextures);
SetNamespace("V_START", "V_END", ns_strifevoices);
SetNamespace("HI_START", "HI_END", ns_hires);
SetNamespace("VX_START", "VX_END", ns_voxels);
SkinHack();
}
return true;
}
//==========================================================================
//
// IsMarker
//
// (from BOOM)
//
//==========================================================================
inline bool FWadFile::IsMarker(int lump, const char *marker)
{
if (Lumps[lump].getName()[0] == marker[0])
{
return (!strcmp(Lumps[lump].getName(), marker) ||
(marker[1] == '_' && !strcmp(Lumps[lump].getName() +1, marker)));
}
else return false;
}
//==========================================================================
//
// SetNameSpace
//
// Sets namespace information for the lumps. It always looks for the first
// x_START and the last x_END lump, except when loading flats. In this case
// F_START may be absent and if that is the case all lumps with a size of
// 4096 will be flagged appropriately.
//
//==========================================================================
// This class was supposed to be local in the function but GCC
// does not like that.
struct Marker
{
int markertype;
unsigned int index;
};
void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, namespace_t space, bool flathack)
{
bool warned = false;
int numstartmarkers = 0, numendmarkers = 0;
unsigned int i;
TArray<Marker> markers;
for(i = 0; i < NumLumps; i++)
{
if (IsMarker(i, startmarker))
{
Marker m = { 0, i };
markers.Push(m);
numstartmarkers++;
}
else if (IsMarker(i, endmarker))
{
Marker m = { 1, i };
markers.Push(m);
numendmarkers++;
}
}
if (numstartmarkers == 0)
{
if (numendmarkers == 0) return; // no markers found
Printf(TEXTCOLOR_YELLOW"WARNING: %s marker without corresponding %s found.\n", endmarker, startmarker);
if (flathack)
{
// We have found no F_START but one or more F_END markers.
// mark all lumps before the last F_END marker as potential flats.
unsigned int end = markers[markers.Size()-1].index;
for(unsigned int i = 0; i < end; i++)
{
if (Lumps[i].LumpSize == 4096)
{
// 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[i].getName());
Lumps[i].Flags |= LUMPF_MAYBEFLAT;
}
}
}
return;
}
i = 0;
while (i < markers.Size())
{
int start, end;
if (markers[i].markertype != 0)
{
Printf(TEXTCOLOR_YELLOW"WARNING: %s marker without corresponding %s found.\n", endmarker, startmarker);
i++;
continue;
}
start = i++;
// skip over subsequent x_START markers
while (i < markers.Size() && markers[i].markertype == 0)
{
Printf(TEXTCOLOR_YELLOW"WARNING: duplicate %s marker found.\n", 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);
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);
end = NumLumps;
}
else
{
end = markers[i++].index;
}
// we found a marked block
DPrintf(DMSG_NOTIFY, "Found %s block at (%d-%d)\n", 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);
}
warned = true;
}
else if (space == ns_sprites && Lumps[j].LumpSize < 8)
{
// sf 26/10/99:
// 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);
}
else
{
Lumps[j].Namespace = space;
}
}
}
}
//==========================================================================
//
// W_SkinHack
//
// Tests a wad file to see if it contains an S_SKIN marker. If it does,
// every lump in the wad is moved into a new namespace. Because skins are
// only supposed to replace player sprites, sounds, or faces, this should
// not be a problem. Yes, there are skins that replace more than that, but
// they are such a pain, and breaking them like this was done on purpose.
// This also renames any S_SKINxx lumps to just S_SKIN.
//
//==========================================================================
void FWadFile::SkinHack ()
{
// this being static is not a problem. The only relevant thing is that each skin gets a different number.
static int namespc = ns_firstskin;
bool skinned = false;
bool hasmap = false;
uint32_t i;
for (i = 0; i < NumLumps; i++)
{
FResourceLump *lump = &Lumps[i];
if (!strnicmp(lump->getName(), "S_SKIN", 6))
{ // Wad has at least one skin.
lump->LumpNameSetup("S_SKIN");
if (!skinned)
{
skinned = true;
uint32_t j;
for (j = 0; j < NumLumps; j++)
{
Lumps[j].Namespace = namespc;
}
namespc++;
}
}
if ((lump->getName()[0] == 'M' &&
lump->getName()[1] == 'A' &&
lump->getName()[2] == 'P' &&
lump->getName()[3] >= '0' && lump->getName()[3] <= '9' &&
lump->getName()[4] >= '0' && lump->getName()[4] <= '9' &&
lump->getName()[5] >= '\0')
||
(lump->getName()[0] == 'E' &&
lump->getName()[1] >= '0' && lump->getName()[1] <= '9' &&
lump->getName()[2] == 'M' &&
lump->getName()[3] >= '0' && lump->getName()[3] <= '9' &&
lump->getName()[4] >= '\0'))
{
hasmap = true;
}
}
if (skinned && hasmap)
{
Printf (TEXTCOLOR_BLUE
"The maps in %s will not be loaded because it has a skin.\n"
TEXTCOLOR_BLUE
"You should remove the skin from the wad to play these maps.\n",
FileName.GetChars());
}
}
//==========================================================================
//
// File open
//
//==========================================================================
FResourceFile *CheckWad(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
{
char head[4];
if (file.GetLength() >= 12)
{
file.Seek(0, FileReader::SeekSet);
file.Read(&head, 4);
file.Seek(0, FileReader::SeekSet);
if (!memcmp(head, "IWAD", 4) || !memcmp(head, "PWAD", 4))
{
FResourceFile *rf = new FWadFile(filename, file);
if (rf->Open(quiet, filter)) return rf;
file = std::move(rf->Reader); // to avoid destruction of reader
delete rf;
}
}
return NULL;
}