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/* ScummVM - Scumm Interpreter
* Copyright (C) 2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#include "common/file.h"
#include "parallaction/disk.h"
#include "parallaction/parallaction.h"
namespace Parallaction {
// HACK: one archive ('fr') in Nippon Safes Demo for Amiga uses different
// internal offsets than all the other archives. When an archive is opened
// its size if checked against SIZEOF_SMALL_ARCHIVE ('fr' size) so Archive
// can behave properly.
//
#define SIZEOF_SMALL_ARCHIVE 12778
#define ARCHIVE_FILENAMES_OFS 0x16
#define NORMAL_ARCHIVE_FILES_NUM 384
#define SMALL_ARCHIVE_FILES_NUM 180
#define NORMAL_ARCHIVE_SIZES_OFS 0x3016
#define SMALL_ARCHIVE_SIZES_OFS 0x1696
#define NORMAL_ARCHIVE_DATA_OFS 0x4000
#define SMALL_ARCHIVE_DATA_OFS 0x1966
Archive::Archive() {
resetArchivedFile();
}
void Archive::open(const char *file) {
debugC(1, kDebugDisk, "open archive '%s'", file);
if (_archive.isOpen())
close();
char path[PATH_LEN];
strcpy(path, file);
if (!_archive.open(path))
error("archive '%s' not found", path);
bool isSmallArchive = _archive.size() == SIZEOF_SMALL_ARCHIVE;
_numFiles = (isSmallArchive) ? SMALL_ARCHIVE_FILES_NUM : NORMAL_ARCHIVE_FILES_NUM;
_archive.seek(ARCHIVE_FILENAMES_OFS);
_archive.read(_archiveDir, _numFiles*32);
_archive.seek((isSmallArchive) ? SMALL_ARCHIVE_SIZES_OFS : NORMAL_ARCHIVE_SIZES_OFS);
uint32 dataOffset = (isSmallArchive) ? SMALL_ARCHIVE_DATA_OFS : NORMAL_ARCHIVE_DATA_OFS;
for (uint16 i = 0; i < _numFiles; i++) {
_archiveOffsets[i] = dataOffset;
_archiveLenghts[i] = _archive.readUint32BE();
dataOffset += _archiveLenghts[i];
}
return;
}
void Archive::close() {
debugC(1, kDebugDisk, "close current archive");
if (!_archive.isOpen()) return;
resetArchivedFile();
_archive.close();
}
bool Archive::openArchivedFile(const char *filename) {
resetArchivedFile();
if (!_archive.isOpen())
error("Archive::openArchivedFile: the archive is not open");
uint16 i = 0;
for ( ; i < _numFiles; i++) {
if (!scumm_stricmp(_archiveDir[i], filename)) break;
}
if (i == _numFiles) return false;
debugC(1, kDebugDisk, "file '%s' found in slot %i", filename, i);
_file = true;
_fileOffset = _archiveOffsets[i];
_fileCursor = _archiveOffsets[i];
_fileEndOffset = _archiveOffsets[i] + _archiveLenghts[i];
_archive.seek(_fileOffset);
return true;
}
void Archive::resetArchivedFile() {
_file = false;
_fileCursor = 0;
_fileOffset = 0;
_fileEndOffset = 0;
}
void Archive::closeArchivedFile() {
resetArchivedFile();
}
uint32 Archive::size() const {
return (_file == true ? _fileEndOffset - _fileOffset : 0);
}
uint32 Archive::pos() const {
return (_file == true ? _fileCursor - _fileOffset : 0 );
}
bool Archive::eos() const {
return (_file == true ? _fileCursor == _fileEndOffset : true );
}
void Archive::seek(int32 offs, int whence) {
assert(_file == true && _fileCursor <= _fileEndOffset);
switch (whence) {
case SEEK_CUR:
_fileCursor += offs;
break;
case SEEK_SET:
_fileCursor = _fileOffset + offs;
break;
case SEEK_END:
_fileCursor = _fileEndOffset - offs;
break;
}
assert(_fileCursor <= _fileEndOffset && _fileCursor >= _fileOffset);
_archive.seek(_fileCursor, SEEK_SET);
}
uint32 Archive::read(void *dataPtr, uint32 dataSize) {
// printf("read(%i, %i)\n", file->_cursor, file->_endOffset);
if (_file == false)
error("Archive::read: no archived file is currently open");
if (_fileCursor >= _fileEndOffset)
error("can't read beyond end of archived file");
if (_fileEndOffset - _fileCursor < dataSize)
dataSize = _fileEndOffset - _fileCursor;
int32 readBytes = _archive.read(dataPtr, dataSize);
_fileCursor += readBytes;
return readBytes;
}
} // namespace Parallaction
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