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Diffstat (limited to 'engines/sci/engine/file.cpp')
-rw-r--r-- | engines/sci/engine/file.cpp | 139 |
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 index 0000000000..8876f3c46c --- /dev/null +++ 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 |