140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
/*
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** file_grp.cpp
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2009 Randy Heit
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** Copyright 2005-2020 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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**
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*/
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#include "resourcefile.h"
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namespace FileSys {
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//==========================================================================
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//
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// Open it
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// Note that SSIs can contain embedded GRPs which must be flagged accordingly.
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//
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//==========================================================================
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static bool OpenSSI(FResourceFile* file, int version, int EntryCount, LumpFilterInfo*)
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{
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uint32_t NumLumps = EntryCount * 2;
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auto Entries = file->AllocateEntries(NumLumps);
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auto Reader = file->GetContainerReader();
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int32_t j = (version == 2 ? 267 : 254) + (EntryCount * 121);
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for (uint32_t i = 0; i < NumLumps; i+=2)
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{
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char fn[13];
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int strlength = Reader->ReadUInt8();
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if (strlength > 12) strlength = 12;
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Reader->Read(fn, 12);
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fn[strlength] = 0;
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int flength = Reader->ReadInt32();
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Entries[i].Position = j;
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Entries[i].CompressedSize = Entries[i].Length = flength;
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Entries[i].Flags = 0;
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Entries[i].Namespace = ns_global;
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Entries[i].Method = METHOD_STORED;
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Entries[i].ResourceID = -1;
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Entries[i].FileName = file->NormalizeFileName(fn);
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if (strstr(fn, ".GRP")) Entries[i].Flags |= RESFF_EMBEDDED;
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// SSI files can swap the order of the extension's characters - but there's no reliable detection for this and it can be mixed inside the same container,
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// so we have no choice but to create another file record for the altered name.
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std::swap(fn[strlength - 1], fn[strlength - 3]);
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Entries[i + 1].Position = j;
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Entries[i + 1].CompressedSize = Entries[i + 1].Length = flength;
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Entries[i + 1].Flags = 0;
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Entries[i + 1].Namespace = ns_global;
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Entries[i + 1].ResourceID = -1;
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Entries[i + 1].FileName = file->NormalizeFileName(fn);
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Entries[i + 1].Method = METHOD_STORED;
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if (strstr(fn, ".GRP")) Entries[i + 1].Flags |= RESFF_EMBEDDED;
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j += flength;
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Reader->Seek(104, FileReader::SeekCur);
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file->GenerateHash();
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}
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return true;
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}
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//==========================================================================
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//
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// File open
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//
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//==========================================================================
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FResourceFile* CheckSSI(const char* filename, FileReader& file, LumpFilterInfo* filter, FileSystemMessageFunc Printf, StringPool* sp)
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{
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char zerobuf[72];
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char buf[72];
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memset(zerobuf, 0, 72);
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auto skipstring = [&](size_t length)
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{
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size_t strlength = file.ReadUInt8();
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if (strlength > length) return false;
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size_t count = file.Read(buf, length);
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buf[length] = 0;
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if (count != length || strlen(buf) != strlength) return false;
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if (length != strlength && memcmp(buf + strlength, zerobuf, length - strlength)) return false;
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return true;
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};
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if (file.GetLength() >= 12)
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{
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// check if SSI
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// this performs several checks because there is no "SSI" magic
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int version = file.ReadInt32();
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if (version == 1 || version == 2) // if
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{
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int numfiles = file.ReadInt32();
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if (!skipstring(32)) return nullptr;
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if (version == 2 && !skipstring(12)) return nullptr;
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for (int i = 0; i < 3; i++)
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{
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if (!skipstring(70)) return nullptr;
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}
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auto ssi = new FResourceFile(filename, file, sp);
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if (OpenSSI(ssi, version, numfiles, filter)) return ssi;
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file = ssi->Destroy();
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}
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}
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return nullptr;
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}
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}
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