mirror of
https://github.com/libretro/scummvm.git
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164 lines
3.6 KiB
C++
164 lines
3.6 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2006 The ScummVM project
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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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* 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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* 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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* $URL$
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* $Id$
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*
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*/
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#include "common/file.h"
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#include "parallaction/disk.h"
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namespace Parallaction {
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Archive::Archive() {
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resetArchivedFile();
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}
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void Archive::open(const char *file) {
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debugC(1, kDebugDisk, "open archive '%s'", file);
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if (_archive.isOpen())
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close();
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uint32 offset = DIRECTORY_OFFSET_IN_FILE;
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char path[PATH_LEN];
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strcpy(path, file);
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if (!_archive.open(path))
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error("archive '%s' not found", path);
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_archive.skip(22);
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_archive.read(_archiveDir, MAX_ARCHIVE_ENTRIES*32);
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uint16 i;
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for (i = 0; i < MAX_ARCHIVE_ENTRIES; i++) {
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_archiveOffsets[i] = offset;
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uint32 len = _archive.readUint32BE();
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// if (len>0) printf("%i) %s - [%i bytes]\n", i, _archiveDir[i], len);
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_archiveLenghts[i] = len;
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offset += len;
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}
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// printf("%i entries found\n", i);
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// printf("%i bytes of data\n", offset);
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return;
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}
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void Archive::close() {
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debugC(1, kDebugDisk, "close current archive");
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if (!_archive.isOpen()) return;
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resetArchivedFile();
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_archive.close();
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}
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bool Archive::openArchivedFile(const char *filename) {
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resetArchivedFile();
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uint16 i = 0;
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for ( ; i < MAX_ARCHIVE_ENTRIES; i++) {
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if (!scumm_stricmp(_archiveDir[i], filename)) break;
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}
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if (i == MAX_ARCHIVE_ENTRIES) return false;
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debugC(1, kDebugDisk, "file '%s' found in slot %i", filename, i);
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_file = true;
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_fileOffset = _archiveOffsets[i];
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_fileCursor = _archiveOffsets[i];
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_fileEndOffset = _archiveOffsets[i] + _archiveLenghts[i];
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_archive.seek(_fileOffset);
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return true;
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}
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void Archive::resetArchivedFile() {
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_file = false;
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_fileCursor = 0;
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_fileOffset = 0;
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_fileEndOffset = 0;
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}
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void Archive::closeArchivedFile() {
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resetArchivedFile();
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}
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uint32 Archive::size() const {
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return (_file == true ? _fileEndOffset - _fileOffset : 0);
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}
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uint32 Archive::pos() const {
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return (_file == true ? _fileCursor - _fileOffset : 0 );
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}
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bool Archive::eos() const {
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return (_file == true ? _fileCursor == _fileEndOffset : true );
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}
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void Archive::seek(int32 offs, int whence) {
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assert(_file == true && _fileCursor <= _fileEndOffset);
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switch (whence) {
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case SEEK_CUR:
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_fileCursor += offs;
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break;
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case SEEK_SET:
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_fileCursor = _fileOffset + offs;
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break;
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case SEEK_END:
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_fileCursor = _fileEndOffset - offs;
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break;
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}
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assert(_fileCursor <= _fileEndOffset && _fileCursor >= _fileOffset);
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_archive.seek(_fileCursor, SEEK_SET);
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}
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uint32 Archive::read(void *dataPtr, uint32 dataSize) {
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// printf("read(%i, %i)\n", file->_cursor, file->_endOffset);
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if (_file == false)
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error("Archive::read: no archived file is currently open");
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if (_fileCursor >= _fileEndOffset)
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error("can't read beyond end of archived file");
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if (_fileEndOffset - _fileCursor < dataSize)
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dataSize = _fileEndOffset - _fileCursor;
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int32 readBytes = _archive.read(dataPtr, dataSize);
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_fileCursor += readBytes;
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return readBytes;
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}
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} // namespace Parallaction
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