722 lines
17 KiB
C++
722 lines
17 KiB
C++
#include "cvcrfile.h"
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "lastexpress/lastexpress.h"
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#include "common/file.h"
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#include "common/memstream.h"
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#include "common/savefile.h"
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#include "common/stream.h"
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#include "engines/metaengine.h"
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namespace LastExpress {
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CVCRFile::CVCRFile(LastExpressEngine *engine) {
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_engine = engine;
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_filename = "";
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_virtualFileIsOpen = false;
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_virtualFileSize = 0;
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_rwStreamSize = 0;
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memset(_rleDstBuf, 0, sizeof(_rleDstBuf));
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_rleBufferPosition = -1;
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_rleByte = 0;
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_rleCount = 0;
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_rleMode = 0;
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_bytesProcessed = 0;
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_rleStatus = 0;
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_fileMode = 0;
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}
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CVCRFile::~CVCRFile() {
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close();
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}
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bool CVCRFile::open(const char *filename, int mode) {
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_filename = filename;
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_rleBufferPosition = -1;
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switch (mode) {
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case CVCRMODE_WB:
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debug(6, "CVCRFile::open(): Opening file \'%s\' on mode 0 (\'wb\')", filename);
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break;
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case CVCRMODE_RB:
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debug(6, "CVCRFile::open(): Opening file \'%s\' on mode 0 (\'rb\')", filename);
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break;
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case CVCRMODE_RWB:
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debug(6, "CVCRFile::open(): Opening file \'%s\' on mode 0 (\'r+b\')", filename);
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break;
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default:
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error("CVCRFile::open(): Invalid file mode");
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}
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Common::OutSaveFile *outSaveFile = nullptr;
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Common::InSaveFile *inSaveFile = nullptr;
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if (mode == CVCRMODE_WB) {
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outSaveFile = g_engine->getSaveFileManager()->openForSaving(_engine->getTargetName() + "-" + Common::String(_filename), false);
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_virtualFileIsOpen = outSaveFile != nullptr;
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if (outSaveFile)
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_virtualFileSize = (uint32)outSaveFile->size();
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} else {
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inSaveFile = g_engine->getSaveFileManager()->openForLoading(_engine->getTargetName() + "-" + Common::String(_filename));
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_virtualFileIsOpen = inSaveFile != nullptr;
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if (inSaveFile)
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_virtualFileSize = (uint32)inSaveFile->size();
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}
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_fileMode = mode;
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if (!_virtualFileIsOpen) {
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error("Error opening file \"%s\". It probably doesn\'t exist or is write protected.", _filename.c_str());
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} else {
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// If this file was opened on 'r+b' mode, allocate at least 16kb
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uint32 fileSize = ((_fileMode == CVCRMODE_RWB || _fileMode == CVCRMODE_WB) && _virtualFileSize < 16 * 1024) ? 16 * 1024 : _virtualFileSize;
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if (inSaveFile && fileSize) {
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byte *fileContent = (byte *)malloc(fileSize);
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if (!fileContent) {
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error("Out of memory");
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}
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inSaveFile->read(fileContent, fileSize);
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_rwStream = new Common::MemorySeekableReadWriteStream(fileContent, fileSize, DisposeAfterUse::YES);
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_rwStreamSize = fileSize;
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delete inSaveFile;
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}
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if (outSaveFile && fileSize) {
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byte *fileContent = (byte *)malloc(fileSize);
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if (!fileContent) {
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error("Out of memory");
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}
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memset(fileContent, 0, fileSize);
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_rwStream = new Common::MemorySeekableReadWriteStream(fileContent, fileSize, DisposeAfterUse::YES);
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_rwStreamSize = fileSize;
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outSaveFile->finalize();
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delete outSaveFile;
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}
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}
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return _virtualFileIsOpen;
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}
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uint32 CVCRFile::read(void *dstBuf, uint32 elementSize, uint32 elementCount, bool forceSimpleReadOnRle, bool checkSize) {
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uint32 readAmount;
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if ((forceSimpleReadOnRle || !_rleStatus) && _virtualFileIsOpen) {
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readAmount = _rwStream->read(dstBuf, elementSize * elementCount);
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if (checkSize) {
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if (readAmount != elementSize * elementCount) {
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error("Error reading from file \"%s\"", _filename.c_str());
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}
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}
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return readAmount / elementSize;
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} else {
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error("Error reading from file \"%s\"", _filename.c_str());
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return 0;
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}
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}
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uint32 CVCRFile::write(void *srcBuf, uint32 elementSize, uint32 elementCount, bool forceSimpleWriteOnRle) {
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uint32 wroteAmount;
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if ((forceSimpleWriteOnRle || !_rleStatus) && _virtualFileIsOpen) {
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// Check if we have to allocate a bigger stream...
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uint32 amountToWrite = elementSize * elementCount;
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int64 atWhichPos = _rwStream->pos();
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uint32 oldSize = _rwStreamSize;
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bool haveToRaiseStreamSize = amountToWrite + atWhichPos > _rwStreamSize;
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if (haveToRaiseStreamSize) {
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while (amountToWrite + atWhichPos > _rwStreamSize) {
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_rwStreamSize += 16 * 1024; // Add another 16 kb until we can fit the new data...
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}
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// Allocate the new and bigger buffer and create a new stream with it...
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byte *newBuffer = (byte *)malloc(_rwStreamSize);
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if (!newBuffer) {
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error("Out of memory");
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}
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Common::MemorySeekableReadWriteStream *newStream = new Common::MemorySeekableReadWriteStream(newBuffer, _rwStreamSize, DisposeAfterUse::YES);
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// Create a temporary buffer in which we will pour the old data...
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byte *tmp = (byte *)malloc(oldSize);
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if (!tmp) {
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error("Out of memory");
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}
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// Read the old data from the old stream to the temporary buffer...
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_rwStream->seek(0, SEEK_SET);
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_rwStream->read(tmp, oldSize);
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// Delete the old stream...
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_rwStream->finalize();
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delete _rwStream;
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// Update the pointer for _rwStream with the new one...
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_rwStream = newStream;
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_rwStream->write(tmp, oldSize);
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_rwStream->seek(atWhichPos, SEEK_SET);
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// Clean-up...
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free(tmp);
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}
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wroteAmount = _rwStream->write(srcBuf, amountToWrite);
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if (wroteAmount != amountToWrite) {
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error("Error writing to file \"%s\". Your disk is probably full.", _filename.c_str());
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}
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// Update virtual file size...
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_virtualFileSize = _virtualFileSize < (amountToWrite + atWhichPos) ? (amountToWrite + atWhichPos) : _virtualFileSize;
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return wroteAmount / elementSize;
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} else {
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error("Error writing to file \"%s\". Your disk is probably full.", _filename.c_str());
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return 0;
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}
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}
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uint32 CVCRFile::readRLE(void *dstBuf, uint32 elementSize, uint32 elementCount) {
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uint8 curRleOp;
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uint8 *value = (uint8 *)dstBuf;
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uint32 remaining = elementSize * elementCount;
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if (_rleStatus == 2) {
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error("Error reading from file \"%s\"", _filename.c_str());
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return 0;
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}
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_rleStatus = 1;
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if (remaining != 0) {
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while (true) {
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if (_rleMode >= 2) {
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if (_rleMode == 2) {
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*value = _rleByte;
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value++;
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_rleCount--;
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if (!_rleCount)
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_rleMode = 1;
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}
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if (!--remaining)
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return elementCount;
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continue;
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}
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if (_rleBufferPosition == -1 || _rleBufferPosition >= 256) {
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read(_rleDstBuf, 1, 256, true, false);
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_rleBufferPosition = 0;
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}
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curRleOp = _rleDstBuf[_rleBufferPosition];
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_rleBufferPosition++;
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switch (curRleOp) {
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case 0xFE:
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if (_rleBufferPosition == -1 || _rleBufferPosition >= 256) {
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read(_rleDstBuf, 1, 256, true, false);
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_rleBufferPosition = 0;
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}
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curRleOp = _rleDstBuf[_rleBufferPosition];
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_rleBufferPosition++;
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*value = curRleOp;
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value++;
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break;
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case 0xFF:
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if (_rleBufferPosition == -1 || _rleBufferPosition >= 256) {
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read(_rleDstBuf, 1, 256, true, false);
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_rleBufferPosition = 0;
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}
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_rleCount = _rleDstBuf[_rleBufferPosition] - 1;
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_rleBufferPosition++;
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if (_rleBufferPosition == -1 || _rleBufferPosition >= 256) {
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read(_rleDstBuf, 1, 256, true, false);
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_rleBufferPosition = 0;
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}
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_rleByte = _rleDstBuf[_rleBufferPosition];
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_rleBufferPosition++;
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*value = _rleByte;
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value++;
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_rleMode = 2;
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break;
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case 0xFB:
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_rleCount = 2;
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_rleByte = 0;
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*value = 0;
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value++;
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_rleMode = 2;
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break;
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case 0xFD:
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if (_rleBufferPosition == -1 || _rleBufferPosition >= 256) {
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read(_rleDstBuf, 1, 256, 1, 0);
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_rleBufferPosition = 0;
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}
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_rleByte = 0;
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_rleCount = _rleDstBuf[_rleBufferPosition] - 1;
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_rleBufferPosition++;
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*value = 0;
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value++;
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_rleMode = 2;
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break;
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case 0xFC:
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_rleCount = 0xFE;
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_rleByte = 0;
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*value = 0;
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value++;
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_rleMode = 2;
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break;
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default:
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*value = curRleOp;
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value++;
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break;
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}
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if (!--remaining)
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return elementCount;
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} // while
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}
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return elementCount;
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}
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uint32 CVCRFile::writeRLE(void *srcBuf, uint32 elementSize, uint32 elementCount) {
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uint8 *value = (uint8 *)srcBuf;
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uint32 remaining = elementSize * elementCount;
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if (_rleStatus == 1) {
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error("Error writing to file \"%s\". Your disk is probably full.", _filename.c_str());
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return 0;
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}
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for (_rleStatus = 2; remaining; --remaining) {
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switch (_rleMode) {
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case 0:
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_rleMode = 1;
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_rleByte = *value;
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value++;
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break;
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case 1:
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if (*value == _rleByte) {
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_rleMode = 2;
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_rleCount = 2;
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value++;
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} else {
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if (_rleBufferPosition == -1)
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_rleBufferPosition = 0;
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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if (_rleByte < 0xFB) {
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_rleDstBuf[_rleBufferPosition] = _rleByte;
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} else {
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_rleDstBuf[_rleBufferPosition] = 0xFE;
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}
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_bytesProcessed++;
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_rleBufferPosition++;
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if (_rleByte >= 0xFB) {
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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_rleDstBuf[_rleBufferPosition] = _rleByte;
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_rleBufferPosition++;
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_bytesProcessed++;
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}
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_rleByte = *value;
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value++;
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}
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break;
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case 2:
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if (*value != _rleByte) {
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if (_rleCount != 3 || _rleByte) {
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if (_rleCount == 0xFF) {
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if (_rleByte) {
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writeToRLEBuffer(0xFF, 1);
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writeToRLEBuffer(_rleCount, 1);
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writeToRLEBuffer(_rleByte, 1);
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_rleMode = 1;
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_rleByte = *value;
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value++;
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continue;
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}
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writeToRLEBuffer(0xFC, 1);
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} else {
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if (_rleByte) {
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writeToRLEBuffer(0xFF, 1);
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writeToRLEBuffer(_rleCount, 1);
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writeToRLEBuffer(_rleByte, 1);
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_rleMode = 1;
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_rleByte = *value;
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value++;
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continue;
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}
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writeToRLEBuffer(0xFD, 1);
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writeToRLEBuffer(_rleCount, 1);
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}
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} else {
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if (_rleBufferPosition == -1)
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_rleBufferPosition = 0;
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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_rleDstBuf[_rleBufferPosition++] = 0xFB;
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_bytesProcessed++;
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}
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_rleMode = 1;
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_rleByte = *value;
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value++;
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continue;
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}
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if (_rleCount == 0xFF) {
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if (!_rleByte) {
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writeToRLEBuffer(0xFC, 1);
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_rleMode = 1;
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_rleByte = *value;
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value++;
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continue;
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}
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writeToRLEBuffer(0xFF, 1);
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writeToRLEBuffer(_rleCount, 1);
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writeToRLEBuffer(_rleByte, 1);
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_rleMode = 1;
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_rleByte = *value;
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value++;
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continue;
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}
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value++;
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_rleCount++;
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break;
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default:
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break;
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}
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}
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return elementCount;
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}
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void CVCRFile::writeToRLEBuffer(uint8 operation, uint8 flag) {
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if (_rleBufferPosition == -1)
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_rleBufferPosition = 0;
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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if (flag || operation < 0xFB) {
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_rleDstBuf[_rleBufferPosition] = operation;
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} else {
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_rleDstBuf[_rleBufferPosition] = 0xFE;
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}
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_bytesProcessed++;
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_rleBufferPosition++;
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if (!flag && operation >= 0xFB) {
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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_rleDstBuf[_rleBufferPosition] = operation;
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_rleBufferPosition++;
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_bytesProcessed++;
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}
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}
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#define FINISH_FLUSH_OP \
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{ \
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if (_rleBufferPosition != -1 && _rleBufferPosition) { \
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write(_rleDstBuf, _rleBufferPosition, 1, true); \
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\
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_rleBufferPosition = -1; \
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_rleStatus = 0; \
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_rleMode = 0; \
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result = _bytesProcessed; \
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_bytesProcessed = 0; \
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return result; \
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} else { \
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_rleStatus = 0; \
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_rleMode = 0; \
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result = _bytesProcessed; \
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_bytesProcessed = 0; \
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return result; \
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} \
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} \
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uint32 CVCRFile::flush() {
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uint32 result;
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if (_rleStatus == 2) {
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if (_rleMode == 1) {
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if (_rleBufferPosition == -1)
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_rleBufferPosition = 0;
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, 1);
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}
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if (_rleByte < 0xFB) {
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_rleDstBuf[_rleBufferPosition] = _rleByte;
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} else {
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_rleDstBuf[_rleBufferPosition] = 0xFE;
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}
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_rleBufferPosition++;
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_bytesProcessed++;
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if (_rleByte >= 0xFB) {
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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_rleDstBuf[_rleBufferPosition] = _rleByte;
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_rleBufferPosition++;
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_bytesProcessed++;
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}
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FINISH_FLUSH_OP;
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}
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if (_rleMode != 2) {
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FINISH_FLUSH_OP;
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}
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if (_rleCount == 3 && !_rleByte) {
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if (_rleBufferPosition == -1)
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_rleBufferPosition = 0;
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if (_rleBufferPosition == 256) {
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_rleBufferPosition = 0;
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write(_rleDstBuf, 256, 1, true);
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}
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_rleDstBuf[_rleBufferPosition] = 0xFB;
|
|
_rleBufferPosition++;
|
|
_bytesProcessed++;
|
|
|
|
FINISH_FLUSH_OP;
|
|
}
|
|
|
|
if (_rleCount == 0xFF) {
|
|
if (!_rleByte) {
|
|
if (_rleBufferPosition == -1)
|
|
_rleBufferPosition = 0;
|
|
|
|
if (_rleBufferPosition == 256) {
|
|
_rleBufferPosition = 0;
|
|
write(_rleDstBuf, 256, 1, true);
|
|
}
|
|
|
|
_rleDstBuf[_rleBufferPosition] = 0xFC;
|
|
_rleBufferPosition++;
|
|
_bytesProcessed++;
|
|
|
|
FINISH_FLUSH_OP;
|
|
}
|
|
} else if (!_rleByte) {
|
|
writeToRLEBuffer(0xFD, 1);
|
|
writeToRLEBuffer(_rleCount, 1);
|
|
|
|
FINISH_FLUSH_OP;
|
|
}
|
|
|
|
writeToRLEBuffer(0xFF, 1);
|
|
writeToRLEBuffer(_rleCount, 1);
|
|
writeToRLEBuffer(_rleByte, 1);
|
|
|
|
FINISH_FLUSH_OP;
|
|
}
|
|
|
|
if (_rleStatus == 1) {
|
|
_rleStatus = 0;
|
|
if (_rleBufferPosition != -1 && _rleBufferPosition != 256) {
|
|
seek(_rleBufferPosition - 256, SEEK_CUR);
|
|
_rleBufferPosition = -1;
|
|
_rleStatus = 0;
|
|
_rleMode = 0;
|
|
result = _bytesProcessed;
|
|
_bytesProcessed = 0;
|
|
return result;
|
|
}
|
|
}
|
|
|
|
_rleStatus = 0;
|
|
_rleMode = 0;
|
|
result = _bytesProcessed;
|
|
_bytesProcessed = 0;
|
|
return result;
|
|
}
|
|
|
|
#undef FINISH_FLUSH_OP
|
|
|
|
uint32 CVCRFile::seek(int32 offset, int mode) {
|
|
int result;
|
|
|
|
if (_rleStatus) {
|
|
error("Error seeking in file \"%s\"", _filename.c_str());
|
|
return 0;
|
|
} else {
|
|
if (_virtualFileIsOpen) {
|
|
result = !_rwStream->seek(offset, mode);
|
|
if (result) {
|
|
error("Error seeking in file \"%s\"", _filename.c_str());
|
|
}
|
|
return result;
|
|
} else {
|
|
error("Error seeking in file \"%s\"", _filename.c_str());
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void CVCRFile::close() {
|
|
if (_virtualFileIsOpen) {
|
|
Common::OutSaveFile *dumpFile = _engine->getSaveFileManager()->openForSaving(_engine->getTargetName() + "-" + Common::String(_filename), false);
|
|
|
|
bool dumpFileIsOpen = dumpFile != nullptr;
|
|
|
|
if (!dumpFileIsOpen) {
|
|
error("Error opening file \"%s\". It probably doesn\'t exist or is write protected.", _filename.c_str());
|
|
}
|
|
|
|
_rwStream->seek(0, SEEK_SET);
|
|
|
|
assert(_virtualFileSize <= _rwStream->size());
|
|
|
|
byte *dumpFileBuf = (byte *)malloc(_virtualFileSize);
|
|
if (!dumpFileBuf) {
|
|
error("Out of memory");
|
|
}
|
|
|
|
_rwStream->read(dumpFileBuf, _virtualFileSize);
|
|
dumpFile->write(dumpFileBuf, _virtualFileSize);
|
|
|
|
if (!dumpFile->flush()) {
|
|
error("Error closing file \"%s\"", _filename.c_str());
|
|
}
|
|
|
|
// This block is not in the original and is used to ensure portability for VCR::shuffleGames()
|
|
if (_fileMode == CVCRMODE_WB || _fileMode == CVCRMODE_RWB) {
|
|
Common::String tsFilename = _filename;
|
|
tsFilename.chop(4);
|
|
tsFilename = _engine->getTargetName() + "-" + tsFilename + ".timestamp";
|
|
|
|
if (_engine->getSaveFileManager()->exists(tsFilename))
|
|
_engine->getSaveFileManager()->removeSavefile(tsFilename);
|
|
|
|
Common::OutSaveFile *tsFile = _engine->getSaveFileManager()->openForSaving(tsFilename, false);
|
|
assert(tsFile);
|
|
|
|
// Add the seconds to the timestamp, so that we have the same granularity as the original...
|
|
TimeDate td;
|
|
_engine->_system->getTimeAndDate(td, true);
|
|
|
|
tsFile->writeSint32LE((int32)td.tm_sec);
|
|
|
|
// Append the extended save header, which includes the file modification timestamp (date and hours/minutes)...
|
|
_engine->getMetaEngine()->appendExtendedSave(tsFile, _engine->getTotalPlayTime(), _filename, false);
|
|
|
|
tsFile->finalize();
|
|
delete tsFile;
|
|
}
|
|
|
|
dumpFile->finalize();
|
|
delete dumpFile;
|
|
|
|
free(dumpFileBuf);
|
|
_rwStream->finalize();
|
|
delete _rwStream;
|
|
_rwStream = nullptr;
|
|
|
|
_rwStreamSize = 0;
|
|
_virtualFileSize = 0;
|
|
_virtualFileIsOpen = false;
|
|
}
|
|
}
|
|
|
|
int32 CVCRFile::tell() {
|
|
if (_rleStatus || !_virtualFileIsOpen) {
|
|
error("Error telling in file \"%s\"", _filename.c_str());
|
|
return 0;
|
|
} else {
|
|
return (int32)_rwStream->pos();
|
|
}
|
|
}
|
|
|
|
} // End of namespace LastExpress
|