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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 {
/*-----------------------------------------------------------------------
* IOHand
*-----------------------------------------------------------------------*/
IoHand::IoHand() : _error(0) {
_file = new Common::File();
}
IoHand::IoHand(const char *name) : _error(0) {
_file = new Common::File();
_file->open(name);
}
IoHand::~IoHand() {
_file->close();
delete _file;
}
uint16 IoHand::read(void *buf, uint16 len) {
if (!_file->isOpen())
return 0;
uint16 bytesRead = _file->read(buf, len);
if (!bytesRead)
error("Read %s - %d bytes", _file->getName(), len);
XCrypt(buf, len);
return bytesRead;
}
long IoHand::mark() {
return _file->pos();
}
long IoHand::seek(long pos) {
_file->seek(pos, SEEK_SET);
return _file->pos();
}
long IoHand::size() {
return _file->size();
}
/*-----------------------------------------------------------------------
* BtPage
*-----------------------------------------------------------------------*/
void BtPage::read(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]._mark = 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();
}
}
}
/*-----------------------------------------------------------------------
* BtFile
*-----------------------------------------------------------------------*/
BtFile::BtFile(const char *name) : IoHand(name) {
debugC(1, kCGEDebugFile, "BtFile::BtFile(%s)", name);
for (int i = 0; i < kBtLevel; i++) {
_buff[i]._page = new BtPage;
_buff[i]._pgNo = kBtValNone;
_buff[i]._indx = -1;
assert(_buff[i]._page != NULL);
}
}
BtFile::~BtFile() {
debugC(1, kCGEDebugFile, "BtFile::~BtFile()");
for (int i = 0; i < kBtLevel; i++)
delete _buff[i]._page;
}
BtPage *BtFile::getPage(int lev, uint16 pgn) {
debugC(1, kCGEDebugFile, "BtFile::getPage(%d, %d)", lev, pgn);
if (_buff[lev]._pgNo != pgn) {
int32 pos = pgn * kBtSize;
_buff[lev]._pgNo = pgn;
assert(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.
seek((uint32) pgn * kBtSize);
// Read in the page
byte buffer[kBtSize];
int bytesRead = read(buffer, kBtSize);
// Unpack it into the page structure
Common::MemoryReadStream stream(buffer, bytesRead, DisposeAfterUse::NO);
_buff[lev]._page->read(stream);
_buff[lev]._indx = -1;
}
return _buff[lev]._page;
}
BtKeypack *BtFile::find(const char *key) {
debugC(1, kCGEDebugFile, "BtFile::find(%s)", key);
int lev = 0;
uint16 nxt = kBtValRoot;
while (!_error) {
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]._indx = 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]._indx = i;
return &pg->_leaf[i];
}
}
return NULL;
}
bool BtFile::exist(const char *name) {
debugC(1, kCGEDebugFile, "BtFile::exist(%s)", name);
return scumm_stricmp(find(name)->_key, name) == 0;
}
/*-----------------------------------------------------------------------
* EncryptedStream
*-----------------------------------------------------------------------*/
EncryptedStream::EncryptedStream(const char *name) {
debugC(3, kCGEDebugFile, "EncryptedStream::EncryptedStream(%s)", name);
_error = false;
if (_dat->_error || _cat->_error)
error("Bad volume data");
BtKeypack *kp = _cat->find(name);
if (scumm_stricmp(kp->_key, name) != 0)
_error = true;
_dat->_file->seek(kp->_mark);
byte *dataBuffer = (byte *)malloc(kp->_size);
_dat->_file->read(dataBuffer, kp->_size);
XCrypt(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() {
}
} // End of namespace CGE
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