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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.
*
*/
/*
* This code is based on original Soltys source code
* Copyright (c) 1994-1995 Janus B. Wisniewski and L.K. Avalon
*/
#include "common/system.h"
#include "common/str.h"
#include "common/debug.h"
#include "common/debug-channels.h"
#include "common/memstream.h"
#include "cge/cge.h"
#include "cge/fileio.h"
namespace CGE {
/*-----------------------------------------------------------------------
* BtPage
*-----------------------------------------------------------------------*/
void BtPage::readBTree(Common::ReadStream &s) {
_header._count = s.readUint16LE();
_header._down = s.readUint16LE();
if (_header._down == kBtValNone) {
// Leaf list
for (int i = 0; i < kBtLeafCount; ++i) {
s.read(_leaf[i]._key, kBtKeySize);
_leaf[i]._pos = s.readUint32LE();
_leaf[i]._size = s.readUint16LE();
}
} else {
// Root index
for (int i = 0; i < kBtInnerCount; ++i) {
s.read(_inner[i]._key, kBtKeySize);
_inner[i]._down = s.readUint16LE();
}
}
}
/*-----------------------------------------------------------------------
* ResourceManager
*-----------------------------------------------------------------------*/
ResourceManager::ResourceManager() {
debugC(1, kCGEDebugFile, "ResourceManager::ResourceManager()");
_datFile = new Common::File();
_datFile->open(kDatName);
_catFile = new Common::File();
_catFile->open(kCatName);
if ((!_datFile) || (!_catFile))
error("Unable to open data files");
for (int i = 0; i < kBtLevel; i++) {
_buff[i]._page = new BtPage;
_buff[i]._pageNo = kBtValNone;
_buff[i]._index = -1;
assert(_buff[i]._page != NULL);
}
}
ResourceManager::~ResourceManager() {
debugC(1, kCGEDebugFile, "ResourceManager::~ResourceManager()");
_datFile->close();
delete _datFile;
_catFile->close();
delete _catFile;
for (int i = 0; i < kBtLevel; i++)
delete _buff[i]._page;
}
uint16 ResourceManager::XCrypt(void *buf, uint16 length) {
byte *b = static_cast<byte *>(buf);
for (uint16 i = 0; i < length; i++)
*b++ ^= kCryptSeed;
return kCryptSeed;
}
bool ResourceManager::seek(int32 offs, int whence) {
return _datFile->seek(offs, whence);
}
uint16 ResourceManager::read(void *buf, uint16 length) {
if (!_datFile->isOpen())
return 0;
uint16 bytesRead = _datFile->read(buf, length);
if (!bytesRead)
error("Read %s - %d bytes", _datFile->getName(), length);
XCrypt(buf, length);
return bytesRead;
}
BtPage *ResourceManager::getPage(int level, uint16 pageId) {
debugC(1, kCGEDebugFile, "IoHand::getPage(%d, %d)", level, pageId);
if (_buff[level]._pageNo != pageId) {
int32 pos = pageId * kBtSize;
_buff[level]._pageNo = pageId;
assert(_catFile->size() > pos);
// In the original, there was a check verifying if the
// purpose was to write a new file. This should only be
// to create a new file, thus it was removed.
_catFile->seek(pageId * kBtSize, SEEK_SET);
// Read in the page
byte buffer[kBtSize];
int bytesRead = catRead(buffer, kBtSize);
// Unpack it into the page structure
Common::MemoryReadStream stream(buffer, bytesRead, DisposeAfterUse::NO);
_buff[level]._page->readBTree(stream);
_buff[level]._index = -1;
}
return _buff[level]._page;
}
BtKeypack *ResourceManager::find(const char *key) {
debugC(1, kCGEDebugFile, "IoHand::find(%s)", key);
int lev = 0;
uint16 nxt = kBtValRoot;
while (!_catFile->eos()) {
BtPage *pg = getPage(lev, nxt);
// search
if (pg->_header._down != kBtValNone) {
int i;
for (i = 0; i < pg->_header._count; i++) {
// Does this work, or does it have to compare the entire buffer?
if (scumm_strnicmp((const char *)key, (const char*)pg->_inner[i]._key, kBtKeySize) < 0)
break;
}
nxt = (i) ? pg->_inner[i - 1]._down : pg->_header._down;
_buff[lev]._index = i - 1;
lev++;
} else {
int i;
for (i = 0; i < pg->_header._count - 1; i++) {
if (scumm_stricmp((const char *)key, (const char *)pg->_leaf[i]._key) <= 0)
break;
}
_buff[lev]._index = i;
return &pg->_leaf[i];
}
}
return NULL;
}
bool ResourceManager::exist(const char *name) {
debugC(1, kCGEDebugFile, "ResourceManager::exist(%s)", name);
return scumm_stricmp(find(name)->_key, name) == 0;
}
uint16 ResourceManager::catRead(void *buf, uint16 length) {
if (!_catFile->isOpen())
return 0;
uint16 bytesRead = _catFile->read(buf, length);
if (!bytesRead)
error("Read %s - %d bytes", _catFile->getName(), length);
XCrypt(buf, length);
return bytesRead;
}
/*-----------------------------------------------------------------------
* EncryptedStream
*-----------------------------------------------------------------------*/
EncryptedStream::EncryptedStream(CGEEngine *vm, const char *name) : _vm(vm) {
debugC(3, kCGEDebugFile, "EncryptedStream::EncryptedStream(%s)", name);
_error = false;
BtKeypack *kp = _vm->_resman->find(name);
if (scumm_stricmp(kp->_key, name) != 0)
_error = true;
_vm->_resman->seek(kp->_pos);
byte *dataBuffer = (byte *)malloc(kp->_size);
_vm->_resman->read(dataBuffer, kp->_size);
_readStream = new Common::MemoryReadStream(dataBuffer, kp->_size, DisposeAfterUse::YES);
}
uint32 EncryptedStream::read(void *dataPtr, uint32 dataSize) {
return _readStream->read(dataPtr, dataSize);
}
bool EncryptedStream::err() {
return (_error & _readStream->err());
}
bool EncryptedStream::eos() {
return _readStream->eos();
}
bool EncryptedStream::seek(int32 offset) {
return _readStream->seek(offset);
}
Common::String EncryptedStream::readLine() {
return _readStream->readLine();
}
int32 EncryptedStream::size() {
return _readStream->size();
}
int32 EncryptedStream::pos() {
return _readStream->pos();
}
EncryptedStream::~EncryptedStream() {
delete _readStream;
}
} // End of namespace CGE
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