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274 lines
8.0 KiB
C++
274 lines
8.0 KiB
C++
/* 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*
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* Based on the original sources
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* Faery Tale II -- The Halls of the Dead
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* (c) 1993-1996 The Wyrmkeep Entertainment Co.
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*/
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#define FORBIDDEN_SYMBOL_ALLOW_ALL // FIXME: Remove
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#include "saga2/std.h"
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#include "saga2/savefile.h"
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#include "saga2/config.h"
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namespace Saga2 {
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/* ===================================================================== *
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Functions
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* ===================================================================== */
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//----------------------------------------------------------------------
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// Construct a file name string for a save file based on the save
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// number
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void getSaveFileName(int16 saveNo, char *fileName) {
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sprintf(fileName, "%s%3.3d.SAV", globalConfig.savedGamePath, saveNo);
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}
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/* ===================================================================== *
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SaveFileConstructor member functions
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* ===================================================================== */
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//----------------------------------------------------------------------
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// Constructor
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SaveFileConstructor::SaveFileConstructor(int16 saveNo, char *saveName) {
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char fileName[fileNameSize];
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// Construct the file name string
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getSaveFileName(saveNo, fileName);
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// Open the file. Throw an exception if the file cannot be opened
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if ((fileHandle = fopen(fileName, "wb")) == NULL)
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error("Cannot create save game file \"%s\"", fileName);
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SaveFileHeader header;
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// Initialize the file header
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memset(&header, '\0', sizeof(header));
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header.gameID = gameID;
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strncpy(header.saveName, saveName, sizeof(header.saveName) - 1);
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// Write the header
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if (fwrite(&header, sizeof(header), 1, fileHandle) != 1)
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error("Error writing save game header: \"%s\"", fileName);
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chunkSize = posInChunk = 0;
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}
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//----------------------------------------------------------------------
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// Destructor
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SaveFileConstructor::~SaveFileConstructor(void) {
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// Simply close the file
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if (fileHandle != NULL) fclose(fileHandle);
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}
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//----------------------------------------------------------------------
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// Create a new chunk without writing the chunk data. NOTE: the size
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// of a chunk must be known to call this function.
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bool SaveFileConstructor::newChunk(ChunkID id, int32 size) {
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// Determine if file position is at end of previous chunk
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if (posInChunk < chunkSize) return false;
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assert(posInChunk == chunkSize);
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SaveFileChunkInfo chunkHeader;
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// Initialize the chunk header
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chunkHeader.id = id;
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chunkHeader.size = size;
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// Write the chunk header
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if (fwrite(&chunkHeader, sizeof(chunkHeader), 1, fileHandle) != 1)
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error("Error writing save game chunk header");
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// Set the chunk variables
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chunkSize = size;
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posInChunk = 0;
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return true;
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}
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//----------------------------------------------------------------------
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// Write data to a chunk created with the newChunk() function.
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int32 SaveFileConstructor::write(void *buf, int32 size) {
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// If asking to write more data than the chunk size, adjust
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// the number of bytes to write
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if (size > chunkSize - posInChunk) size = chunkSize - posInChunk;
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// Write data
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if (size > 0 && fwrite(buf, size, 1, fileHandle) != 1)
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error("Error writing save game data");
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// Adjust the position in chunk
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posInChunk += size;
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// Return the number of bytes written
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return size;
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}
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//----------------------------------------------------------------------
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// Create a new chunk and write the chunk data.
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bool SaveFileConstructor::writeChunk(ChunkID id, void *buf, int32 size) {
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// Determine if file position is at end of previous chunk
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if (posInChunk < chunkSize) return false;
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assert(posInChunk == chunkSize);
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SaveFileChunkInfo chunkHeader;
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// Initialize the chunk header
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chunkHeader.id = id;
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chunkHeader.size = size;
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// Write the chunk header
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if (fwrite(&chunkHeader, sizeof(chunkHeader), 1, fileHandle) != 1)
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error("Error writing save game chunk header");
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// Write the chunk data
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if (size > 0 && fwrite(buf, size, 1, fileHandle) != 1)
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error("Error writing save game data");
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// Initialize the chunk varibles to indicate the file position is
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// at the end of the chunk
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chunkSize = posInChunk = size;
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// Return success
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return true;
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}
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/* ===================================================================== *
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SaveFileReader member functions
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* ===================================================================== */
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//----------------------------------------------------------------------
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// Constructor
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SaveFileReader::SaveFileReader(int16 saveNo) {
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char fileName[fileNameSize];
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// Construct the file name based on the save number
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getSaveFileName(saveNo, fileName);
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// Open the file or throw an exception
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if ((fileHandle = fopen(fileName, "rb")) == NULL)
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error("Cannot open save game file \"%s\"", fileName);
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// Read the save file header
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if (fread(&header, sizeof(header), 1, fileHandle) != 1)
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error("Error reading save game header: \"%s\"", fileName);
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// Initialize the chunk variables
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chunkSize = posInChunk = 0;
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}
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//----------------------------------------------------------------------
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// Destructor
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SaveFileReader::~SaveFileReader(void) {
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// Close the file
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if (fileHandle != NULL) fclose(fileHandle);
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}
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//----------------------------------------------------------------------
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// Set the first chunk to be the current chunk
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bool SaveFileReader::firstChunk(ChunkID &chunk, int32 &size) {
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SaveFileChunkInfo chunkHeader;
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// Seek the first chunk header
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if (fseek(fileHandle, sizeof(SaveFileHeader), SEEK_SET) != 0)
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error("Error seeking first save game chunk");
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// Read the chunk header
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if (fread(&chunkHeader, sizeof(chunkHeader), 1, fileHandle) != 1)
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return false;
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// Initialize the chunk variables
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chunkSize = chunkHeader.size;
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posInChunk = 0;
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// Return the chunk ID and chunk size
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chunk = chunkHeader.id;
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size = chunkHeader.size;
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// Return success
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return true;
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}
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//----------------------------------------------------------------------
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// Make the next chunk the current chunk
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bool SaveFileReader::nextChunk(ChunkID &chunk, int32 &size) {
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assert(posInChunk <= chunkSize);
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// If not already at the beginning of the next chunk header, seek
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// the next chunk
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if (posInChunk < chunkSize) {
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if (fseek(fileHandle, chunkSize - posInChunk, SEEK_CUR) != 0)
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error("Error seeking next save game chunk");
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}
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SaveFileChunkInfo chunkHeader;
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// Read the chunk header
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if (fread(&chunkHeader, sizeof(chunkHeader), 1, fileHandle) != 1)
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return false;
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// Initialize the chunk variables
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chunkSize = chunkHeader.size;
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posInChunk = 0;
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// Return the chunk ID and chunk size
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chunk = chunkHeader.id;
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size = chunkHeader.size;
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// Return success
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return true;
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}
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//----------------------------------------------------------------------
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// Read data from the current chunk
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int32 SaveFileReader::read(void *buf, int32 size) {
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// If asking for more data than is left in the chunk adjust the
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// number of bytes to read
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if (size > chunkSize - posInChunk) size = chunkSize - posInChunk;
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// Read the chunk data
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if (size > 0 && fread(buf, size, 1, fileHandle) != 1)
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error("Error reading save game data");
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// Adjust the position in chunk
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posInChunk += size;
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// Return the number of bytes read
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return size;
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}
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} // end if namespace Saga2
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