1 files changed, 139 insertions, 0 deletions
diff --git a/engines/sci/engine/file.cpp b/engines/sci/engine/file.cpp
new file mode 100644
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+++ b/engines/sci/engine/file.cpp
@@ -0,0 +1,139 @@
+/* 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