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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/savefile.h"
#include "common/stream.h"
#include "sci/sci.h"
#include "sci/engine/file.h"
namespace Sci {
#ifdef ENABLE_SCI32
VirtualIndexFile::VirtualIndexFile(Common::String fileName) : _fileName(fileName), _changed(false) {
Common::SeekableReadStream *inFile = g_sci->getSaveFileManager()->openForLoading(fileName);
_bufferSize = inFile->size();
_buffer = new char[_bufferSize];
inFile->read(_buffer, _bufferSize);
_ptr = _buffer;
delete inFile;
}
VirtualIndexFile::~VirtualIndexFile() {
close();
_bufferSize = 0;
delete[] _buffer;
_buffer = 0;
}
uint32 VirtualIndexFile::read(char *buffer, uint32 size) {
uint32 curPos = _ptr - _buffer;
uint32 finalSize = MIN<uint32>(size, _bufferSize - curPos);
char *localPtr = buffer;
for (uint32 i = 0; i < finalSize; i++)
*localPtr++ = *_ptr++;
return finalSize;
}
uint32 VirtualIndexFile::write(const char *buffer, uint32 size) {
_changed = true;
uint32 curPos = _ptr - _buffer;
// Check if the buffer needs to be resized
if (curPos + size >= _bufferSize) {
_bufferSize = curPos + size + 1;
char *tmp = _buffer;
_buffer = new char[_bufferSize];
_ptr = _buffer + curPos;
memcpy(_buffer, tmp, _bufferSize);
delete[] tmp;
}
for (uint32 i = 0; i < size; i++)
*_ptr++ = *buffer++;
return size;
}
uint32 VirtualIndexFile::readLine(char *buffer, uint32 size) {
uint32 startPos = _ptr - _buffer;
uint32 bytesRead = 0;
char *localPtr = buffer;
// This is not a full-blown implementation of readLine, but it
// suffices for Phantasmagoria
while (startPos + bytesRead < size) {
bytesRead++;
if (*_ptr == 0 || *_ptr == 0x0A) {
_ptr++;
*localPtr = 0;
return bytesRead;
} else {
*localPtr++ = *_ptr++;
}
}
return bytesRead;
}
bool VirtualIndexFile::seek(int32 offset, int whence) {
uint32 startPos = _ptr - _buffer;
assert(offset >= 0);
switch (whence) {
case SEEK_CUR:
assert(startPos + offset < _bufferSize);
_ptr += offset;
break;
case SEEK_SET:
assert(offset < _bufferSize);
_ptr = _buffer + offset;
break;
case SEEK_END:
assert(_bufferSize - offset >= 0);
_ptr = _buffer + (_bufferSize - offset);
break;
}
return true;
}
void VirtualIndexFile::close() {
if (_changed) {
Common::WriteStream *outFile = g_sci->getSaveFileManager()->openForSaving(_fileName);
outFile->write(_buffer, _bufferSize);
delete outFile;
}
// Maintain the buffer, and seek to the beginning of it
_ptr = _buffer;
}
#endif
} // End of namespace Sci
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