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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/scummsys.h"
#include "common/archive.h"
#include "common/memstream.h"
#include "common/textconsole.h"
#include "xeen/xeen.h"
#include "xeen/files.h"
namespace Xeen {
/**
* Hash a given filename to produce the Id that represents it
*/
uint16 BaseCCArchive::convertNameToId(const Common::String &resourceName) {
if (resourceName.empty())
return 0xffff;
Common::String name = resourceName;
name.toUppercase();
// Check if a resource number is being directly specified
if (name.size() == 4) {
char *endPtr;
uint16 num = (uint16)strtol(name.c_str(), &endPtr, 16);
if (!*endPtr)
return num;
}
const byte *msgP = (const byte *)name.c_str();
int total = *msgP++;
for (; *msgP; total += *msgP++) {
// Rotate the bits in 'total' right 7 places
total = (total & 0x007F) << 9 | (total & 0xFF80) >> 7;
}
return total;
}
/**
* Load the index of a given CC file
*/
void BaseCCArchive::loadIndex(Common::SeekableReadStream *stream) {
int count = stream->readUint16LE();
// Read in the data for the archive's index
byte *rawIndex = new byte[count * 8];
stream->read(rawIndex, count * 8);
// Decrypt the index
int ah = 0xac;
for (int i = 0; i < count * 8; ++i) {
rawIndex[i] = (byte)(((rawIndex[i] << 2 | rawIndex[i] >> 6) + ah) & 0xff);
ah += 0x67;
}
// Extract the index data into entry structures
_index.reserve(count);
const byte *entryP = &rawIndex[0];
for (int i = 0; i < count; ++i, entryP += 8) {
CCEntry entry;
entry._id = READ_LE_UINT16(entryP);
entry._offset = READ_LE_UINT32(entryP + 2) & 0xffffff;
entry._size = READ_LE_UINT16(entryP + 5);
assert(!entryP[7]);
_index.push_back(entry);
}
delete[] rawIndex;
}
bool BaseCCArchive::hasFile(const Common::String &name) const {
CCEntry ccEntry;
return getHeaderEntry(name, ccEntry);
}
/**
* Given a resource name, returns whether an entry exists, and returns
* the header index data for that entry
*/
bool BaseCCArchive::getHeaderEntry(const Common::String &resourceName, CCEntry &ccEntry) const {
uint16 id = convertNameToId(resourceName);
// Loop through the index
for (uint i = 0; i < _index.size(); ++i) {
if (_index[i]._id == id) {
ccEntry = _index[i];
return true;
}
}
// Could not find an entry
return false;
}
const Common::ArchiveMemberPtr BaseCCArchive::getMember(const Common::String &name) const {
if (!hasFile(name))
return Common::ArchiveMemberPtr();
return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(name, this));
}
int BaseCCArchive::listMembers(Common::ArchiveMemberList &list) const {
// CC files don't maintain the original filenames, so we can't list it
return 0;
}
/*------------------------------------------------------------------------*/
CCArchive::CCArchive(const Common::String &filename, bool encoded):
BaseCCArchive(), _filename(filename), _encoded(encoded) {
File f(filename);
loadIndex(&f);
}
CCArchive::CCArchive(const Common::String &filename, const Common::String &prefix,
bool encoded): BaseCCArchive(), _filename(filename),
_prefix(prefix), _encoded(encoded) {
_prefix.toLowercase();
File f(filename);
loadIndex(&f);
}
CCArchive::~CCArchive() {
}
bool CCArchive::getHeaderEntry(const Common::String &resourceName, CCEntry &ccEntry) const {
Common::String resName = resourceName;
if (!_prefix.empty() && resName.contains('|')) {
resName.toLowercase();
Common::String prefix = _prefix + "|";
if (!strncmp(resName.c_str(), prefix.c_str(), prefix.size()))
// Matching CC prefix, so strip it off and allow processing to
// continue onto the base getHeaderEntry method
resName = Common::String(resName.c_str() + prefix.size());
else
// Not matching prefix, so don't allow a match
return false;
}
return BaseCCArchive::getHeaderEntry(resName, ccEntry);
}
Common::SeekableReadStream *CCArchive::createReadStreamForMember(const Common::String &name) const {
CCEntry ccEntry;
if (getHeaderEntry(name, ccEntry)) {
// Open the correct CC file
Common::File f;
if (!f.open(_filename))
error("Could not open CC file");
// Read in the data for the specific resource
f.seek(ccEntry._offset);
byte *data = new byte[ccEntry._size];
f.read(data, ccEntry._size);
if (_encoded) {
// Decrypt the data
for (int i = 0; i < ccEntry._size; ++i)
data[i] ^= 0x35;
}
// Return the data as a stream
return new Common::MemoryReadStream(data, ccEntry._size, DisposeAfterUse::YES);
}
return nullptr;
}
/*------------------------------------------------------------------------*/
/**
* Instantiates the resource manager
*/
FileManager::FileManager(XeenEngine *vm) {
Common::File f;
_isDarkCc = vm->getGameID() != GType_Clouds;
if (_isDarkCc)
SearchMan.add("dark", new CCArchive("dark.cc", "dark", true));
SearchMan.add("xeen", new CCArchive("xeen.cc", "xeen", true));
SearchMan.add("intro", new CCArchive("intro.cc", "intro", true));
}
/*------------------------------------------------------------------------*/
/**
* Opens the given file, throwing an error if it can't be opened
*/
void File::openFile(const Common::String &filename) {
if (!Common::File::open(filename))
error("Could not open file - %s", filename.c_str());
}
void File::openFile(const Common::String &filename, Common::Archive &archive) {
if (!Common::File::open(filename, archive))
error("Could not open file - %s", filename.c_str());
}
} // End of namespace Xeen
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