raze-gles/source/common/filesystem/resourcefile.cpp

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/*
** resourcefile.cpp
**
** Base classes for resource file management
**
**---------------------------------------------------------------------------
** Copyright 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 <zlib.h>
#include "resourcefile.h"
#include "name.h"
#include "m_swap.h"
extern FString LumpFilter;
//==========================================================================
//
// File reader that reads from a lump's cache
//
//==========================================================================
class FLumpReader : public MemoryReader
{
FResourceLump *source;
public:
FLumpReader(FResourceLump *src)
: MemoryReader(NULL, src->LumpSize), source(src)
{
bufptr = (const char*)src->Lock();
src->Cache.Data();
}
~FLumpReader()
{
source->Unlock(true);
}
};
//==========================================================================
//
// Base class for resource lumps
//
//==========================================================================
FResourceLump::~FResourceLump()
{
Owner = NULL;
}
//==========================================================================
//
// Sets up the file name information
// This is stored as FNames for various formats.
//
//==========================================================================
void FResourceLump::LumpNameSetup(FString iname)
{
auto pathLen = iname.LastIndexOf('/') + 1;
LumpName[FullNameType] = iname.GetChars();
LumpName[BaseNameType] = iname.GetChars() + pathLen;
auto extStart = iname.LastIndexOf('.');
if (extStart <= pathLen) extStart = -1;
if (extStart > 0)
{
LumpName[ExtensionType] = iname.GetChars() + extStart + 1;
iname.Truncate(extStart);
}
LumpName[FullNameNoExtType] = iname.GetChars();
LumpName[BaseNameNoExtType] = iname.GetChars() + pathLen;
}
//==========================================================================
//
// this is just for completeness. For non-Zips only an uncompressed lump can
// be returned.
//
//==========================================================================
FCompressedBuffer FResourceLump::GetRawData()
{
FCompressedBuffer cbuf = { (unsigned)LumpSize, (unsigned)LumpSize, METHOD_STORED, 0, 0, new char[LumpSize] };
memcpy(cbuf.mBuffer, Lock(), LumpSize);
cbuf.mCRC32 = crc32(0, (uint8_t*)cbuf.mBuffer, LumpSize);
Unlock(true);
return cbuf;
}
//==========================================================================
//
// Returns the owner's FileReader if it can be used to access this lump
//
//==========================================================================
FileReader *FResourceLump::GetReader()
{
return NULL;
}
//==========================================================================
//
// Returns a file reader to the lump's cache
//
//==========================================================================
FileReader FResourceLump::NewReader()
{
return FileReader(new FLumpReader(this));
}
//==========================================================================
//
// Caches a lump's content and increases the reference counter
//
//==========================================================================
void *FResourceLump::Lock()
{
if (Cache.Size())
{
if (RefCount > 0) RefCount++;
}
else if (LumpSize > 0)
{
ValidateCache();
// NBlood has some endian conversion right in here which is extremely dangerous and needs to be handled differently.
// Fortunately Big Endian platforms are mostly irrelevant so this is something to be sorted out later (if ever)
RefCount++;
}
return Cache.Data();
}
//==========================================================================
//
// Caches a lump's content without increasing the reference counter
//
//==========================================================================
void *FResourceLump::Get()
{
if (Cache.Size() == 0)
{
ValidateCache();
}
return Cache.Data();
}
//==========================================================================
//
// Decrements reference counter and frees lump if counter reaches 0
//
//==========================================================================
void FResourceLump::Unlock(bool mayfree)
{
if (LumpSize > 0 && RefCount > 0)
{
if (--RefCount == 0)
{
if (mayfree) Cache.Reset();
}
}
}
//==========================================================================
//
// Opens a resource file
//
//==========================================================================
typedef FResourceFile * (*CheckFunc)(const char *filename, FileReader &file, bool quiet);
FResourceFile *CheckWad(const char *filename, FileReader &file, bool quiet);
FResourceFile *CheckGRP(const char *filename, FileReader &file, bool quiet);
FResourceFile *CheckRFF(const char *filename, FileReader &file, bool quiet);
FResourceFile *CheckPak(const char *filename, FileReader &file, bool quiet);
FResourceFile *CheckZip(const char *filename, FileReader &file, bool quiet);
FResourceFile *Check7Z(const char *filename, FileReader &file, bool quiet);
FResourceFile *CheckLump(const char *filename,FileReader &file, bool quiet);
FResourceFile *CheckDir(const char *filename, bool quiet);
static CheckFunc funcs[] = { CheckGRP, CheckRFF, CheckZip, Check7Z, CheckPak, CheckLump };
FResourceFile *FResourceFile::DoOpenResourceFile(const char *filename, FileReader &file, bool quiet, bool containeronly)
{
for(size_t i = 0; i < countof(funcs) - containeronly; i++)
{
FResourceFile *resfile = funcs[i](filename, file, quiet);
if (resfile != NULL) return resfile;
}
return NULL;
}
FResourceFile *FResourceFile::OpenResourceFile(const char *filename, FileReader &file, bool quiet, bool containeronly)
{
return DoOpenResourceFile(filename, file, quiet, containeronly);
}
FResourceFile *FResourceFile::OpenResourceFile(const char *filename, bool quiet, bool containeronly)
{
FileReader file;
if (!file.OpenFile(filename)) return nullptr;
return DoOpenResourceFile(filename, file, quiet, containeronly);
}
/*
FResourceFile *FResourceFile::OpenResourceFileFromLump(int lumpnum, bool quiet, bool containeronly)
{
FileReader file = Wads.ReopenLumpReader(lumpnum);
return DoOpenResourceFile("internal", file, quiet, containeronly);
}
*/
FResourceFile *FResourceFile::OpenDirectory(const char *filename, bool quiet)
{
return CheckDir(filename, quiet);
}
//==========================================================================
//
// Resource file base class
//
//==========================================================================
FResourceFile::FResourceFile(const char *filename)
: FileName(filename)
{
}
FResourceFile::FResourceFile(const char *filename, FileReader &r)
: FResourceFile(filename)
{
Reader = std::move(r);
}
FResourceFile::~FResourceFile()
{
}
int lumpcmp(const void * a, const void * b)
{
FResourceLump * rec1 = (FResourceLump *)a;
FResourceLump * rec2 = (FResourceLump *)b;
return stricmp(rec1->LumpName[FResourceLump::FullNameType].GetChars(), rec2->LumpName[FResourceLump::FullNameType].GetChars());
}
//==========================================================================
//
// FResourceFile :: PostProcessArchive
//
// Sorts files by name.
// For files named "filter/<game>/*": Using the same filter rules as config
// autoloading, move them to the end and rename them without the "filter/"
// prefix. Filtered files that don't match are deleted.
//
//==========================================================================
void FResourceFile::PostProcessArchive(void *lumps, size_t lumpsize)
{
// Entries in archives are sorted alphabetically
qsort(lumps, NumLumps, lumpsize, lumpcmp);
// Filter out lumps using the same names as the Autoload.* sections
// in the ini file use. We reduce the maximum lump concidered after
// each one so that we don't risk refiltering already filtered lumps.
uint32_t max = NumLumps;
long len;
int lastpos = -1;
FString file;
while ((len = LumpFilter.IndexOf('.', lastpos+1)) > 0)
{
max -= FilterLumps(LumpFilter.Left(len), lumps, lumpsize, max);
lastpos = len;
}
JunkLeftoverFilters(lumps, lumpsize, max);
}
//==========================================================================
//
// FResourceFile :: FilterLumps
//
// Finds any lumps between [0,<max>) that match the pattern
// "filter/<filtername>/*" and moves them to the end of the lump list.
// Returns the number of lumps moved.
//
//==========================================================================
int FResourceFile::FilterLumps(FString filtername, void *lumps, size_t lumpsize, uint32_t max)
{
FString filter;
uint32_t start, end;
if (filtername.IsEmpty())
{
return 0;
}
filter << "filter/" << filtername << '/';
bool found = FindPrefixRange(filter, lumps, lumpsize, max, start, end);
// Workaround for old Doom filter names.
if (!found && filtername.IndexOf("doom.id.doom") == 0)
{
filter.Substitute("doom.id.doom", "doom.doom");
found = FindPrefixRange(filter, lumps, lumpsize, max, start, end);
}
if (found)
{
void *from = (uint8_t *)lumps + start * lumpsize;
// Remove filter prefix from every name
void *lump_p = from;
for (uint32_t i = start; i < end; ++i, lump_p = (uint8_t *)lump_p + lumpsize)
{
FResourceLump *lump = (FResourceLump *)lump_p;
assert(filter.CompareNoCase(lump->FullName(), (int)filter.Len()) == 0);
lump->LumpNameSetup(lump->FullName() + filter.Len());
}
// Move filtered lumps to the end of the lump list.
size_t count = (end - start) * lumpsize;
void *to = (uint8_t *)lumps + NumLumps * lumpsize - count;
assert (to >= from);
if (from != to)
{
// Copy filtered lumps to a temporary buffer.
uint8_t *filteredlumps = new uint8_t[count];
memcpy(filteredlumps, from, count);
// Shift lumps left to make room for the filtered ones at the end.
memmove(from, (uint8_t *)from + count, (NumLumps - end) * lumpsize);
// Copy temporary buffer to newly freed space.
memcpy(to, filteredlumps, count);
delete[] filteredlumps;
}
}
return end - start;
}
//==========================================================================
//
// FResourceFile :: JunkLeftoverFilters
//
// Deletes any lumps beginning with "filter/" that were not matched.
//
//==========================================================================
void FResourceFile::JunkLeftoverFilters(void *lumps, size_t lumpsize, uint32_t max)
{
uint32_t start, end;
if (FindPrefixRange("filter/", lumps, lumpsize, max, start, end))
{
// Since the resource lumps may contain non-POD data besides the
// full name, we "delete" them by erasing their names so they
// can't be found.
void *stop = (uint8_t *)lumps + end * lumpsize;
for (void *p = (uint8_t *)lumps + start * lumpsize; p < stop; p = (uint8_t *)p + lumpsize)
{
FResourceLump *lump = (FResourceLump *)p;
for (auto &ln : lump->LumpName)
ln = NAME_None;
}
}
}
//==========================================================================
//
// FResourceFile :: FindPrefixRange
//
// Finds a range of lumps that start with the prefix string. <start> is left
// indicating the first matching one. <end> is left at one plus the last
// matching one.
//
//==========================================================================
bool FResourceFile::FindPrefixRange(FString filter, void *lumps, size_t lumpsize, uint32_t maxlump, uint32_t &start, uint32_t &end)
{
uint32_t min, max, mid, inside;
FResourceLump *lump;
int cmp;
end = start = 0;
// Pretend that our range starts at 1 instead of 0 so that we can avoid
// unsigned overflow if the range starts at the first lump.
lumps = (uint8_t *)lumps - lumpsize;
// Binary search to find any match at all.
min = 1, max = maxlump;
while (min <= max)
{
mid = min + (max - min) / 2;
lump = (FResourceLump *)((uint8_t *)lumps + mid * lumpsize);
cmp = filter.CompareNoCase(lump->FullName(), (int)filter.Len());
if (cmp == 0)
break;
else if (cmp > 0)
min = mid + 1;
else
max = mid - 1;
}
if (max < min)
{ // matched nothing
return false;
}
// Binary search to find first match.
inside = mid;
min = 1, max = mid;
while (min <= max)
{
mid = min + (max - min) / 2;
lump = (FResourceLump *)((uint8_t *)lumps + mid * lumpsize);
cmp = filter.CompareNoCase(lump->FullName(), (int)filter.Len());
// Go left on matches and right on misses.
if (cmp == 0)
max = mid - 1;
else
min = mid + 1;
}
start = mid + (cmp != 0) - 1;
// Binary search to find last match.
min = inside, max = maxlump;
while (min <= max)
{
mid = min + (max - min) / 2;
lump = (FResourceLump *)((uint8_t *)lumps + mid * lumpsize);
cmp = filter.CompareNoCase(lump->FullName(), (int)filter.Len());
// Go right on matches and left on misses.
if (cmp == 0)
min = mid + 1;
else
max = mid - 1;
}
end = mid - (cmp != 0);
return true;
}
//==========================================================================
//
// Finds a lump by a given name. Used for savegames
//
//==========================================================================
FResourceLump *FResourceFile::FindLump(const char *name)
{
FName lname(name, true);
if (lname == NAME_None) return nullptr;
for (unsigned i = 0; i < NumLumps; i++)
{
FResourceLump *lump = GetLump(i);
if (lump->LumpName[FResourceLump::FullNameType] == lname)
{
return lump;
}
}
return nullptr;
}
//==========================================================================
//
// Caches a lump's content and increases the reference counter
//
//==========================================================================
FileReader *FUncompressedLump::GetReader()
{
Owner->Reader.Seek(Position, FileReader::SeekSet);
return &Owner->Reader;
}
//==========================================================================
//
// Caches a lump's content and increases the reference counter
//
//==========================================================================
int FUncompressedLump::ValidateCache()
{
Owner->Reader.Seek(Position, FileReader::SeekSet);
Cache.Resize(LumpSize);
Owner->Reader.Read(Cache.Data(), LumpSize);
return 1;
}
//==========================================================================
//
// Base class for uncompressed resource files
//
//==========================================================================
FUncompressedFile::FUncompressedFile(const char *filename)
: FResourceFile(filename)
{}
FUncompressedFile::FUncompressedFile(const char *filename, FileReader &r)
: FResourceFile(filename, r)
{}
//==========================================================================
//
// external lump
//
//==========================================================================
FExternalLump::FExternalLump(const char *_filename, int filesize)
: Filename(_filename)
{
if (filesize == -1)
{
FileReader f;
if (f.OpenFile(_filename))
{
LumpSize = (int)f.GetLength();
}
else
{
LumpSize = 0;
}
}
else
{
LumpSize = filesize;
}
}
//==========================================================================
//
// Caches a lump's content and increases the reference counter
// For external lumps this reopens the file each time it is accessed
//
//==========================================================================
int FExternalLump::ValidateCache()
{
Cache.Resize(LumpSize);
FileReader f;
if (f.OpenFile(Filename))
{
f.Read(Cache.Data(), LumpSize);
}
else
{
memset(Cache.Data(), 0, LumpSize);
}
return 1;
}