mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-05 00:36:57 +00:00
501 lines
11 KiB
C++
501 lines
11 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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* $URL$
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* $Id$
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*
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*/
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#include "scumm/file.h"
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#include "scumm/scumm.h"
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namespace Scumm {
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#pragma mark -
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#pragma mark --- ScummFile ---
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#pragma mark -
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ScummFile::ScummFile() : _encbyte(0), _subFileStart(0), _subFileLen(0) {
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}
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void ScummFile::setEnc(byte value) {
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_encbyte = value;
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}
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void ScummFile::setSubfileRange(int32 start, int32 len) {
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// TODO: Add sanity checks
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const int32 fileSize = File::size();
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assert(start <= fileSize);
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assert(start + len <= fileSize);
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_subFileStart = start;
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_subFileLen = len;
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seek(0, SEEK_SET);
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}
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void ScummFile::resetSubfile() {
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_subFileStart = 0;
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_subFileLen = 0;
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seek(0, SEEK_SET);
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}
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bool ScummFile::open(const Common::String &filename) {
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if (File::open(filename)) {
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resetSubfile();
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return true;
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} else {
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return false;
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}
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}
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bool ScummFile::openSubFile(const Common::String &filename) {
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assert(isOpen());
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// Disable the XOR encryption and reset any current subfile range
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setEnc(0);
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resetSubfile();
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// Read in the filename table and look for the specified file
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unsigned long file_off, file_len;
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char file_name[0x20+1];
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unsigned long i;
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// Get the length of the data file to use for consistency checks
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const uint32 data_file_len = size();
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// Read offset and length to the file records */
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const uint32 file_record_off = readUint32BE();
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const uint32 file_record_len = readUint32BE();
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// Do a quick check to make sure the offset and length are good
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if (file_record_off + file_record_len > data_file_len) {
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return false;
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}
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// Do a little consistancy check on file_record_length
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if (file_record_len % 0x28) {
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return false;
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}
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// Scan through the files
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for (i = 0; i < file_record_len; i += 0x28) {
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// read a file record
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seek(file_record_off + i, SEEK_SET);
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file_off = readUint32BE();
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file_len = readUint32BE();
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read(file_name, 0x20);
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file_name[0x20] = 0;
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assert(file_name[0]);
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//debug(7, " extracting \'%s\'", file_name);
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// Consistency check. make sure the file data is in the file
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if (file_off + file_len > data_file_len) {
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return false;
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}
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if (scumm_stricmp(file_name, filename.c_str()) == 0) {
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// We got a match!
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setSubfileRange(file_off, file_len);
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return true;
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}
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}
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return false;
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}
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bool ScummFile::eos() const {
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return _subFileLen ? _myEos : File::eos();
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}
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int32 ScummFile::pos() const {
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return File::pos() - _subFileStart;
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}
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int32 ScummFile::size() const {
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return _subFileLen ? _subFileLen : File::size();
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}
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bool ScummFile::seek(int32 offs, int whence) {
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if (_subFileLen) {
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// Constrain the seek to the subfile
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switch (whence) {
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case SEEK_END:
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offs = _subFileStart + _subFileLen + offs;
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break;
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case SEEK_SET:
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offs += _subFileStart;
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break;
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case SEEK_CUR:
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offs += File::pos();
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break;
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}
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assert((int32)_subFileStart <= offs && offs <= (int32)(_subFileStart + _subFileLen));
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whence = SEEK_SET;
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}
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bool ret = File::seek(offs, whence);
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if (ret)
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_myEos = false;
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return ret;
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}
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uint32 ScummFile::read(void *dataPtr, uint32 dataSize) {
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uint32 realLen;
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if (_subFileLen) {
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// Limit the amount we read by the subfile boundaries.
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const int32 curPos = pos();
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assert(_subFileLen >= curPos);
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int32 newPos = curPos + dataSize;
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if (newPos > _subFileLen) {
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dataSize = _subFileLen - curPos;
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_myEos = true;
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}
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}
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realLen = File::read(dataPtr, dataSize);
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// If an encryption byte was specified, XOR the data we just read by it.
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// This simple kind of "encryption" was used by some of the older SCUMM
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// games.
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if (_encbyte) {
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byte *p = (byte *)dataPtr;
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byte *end = p + realLen;
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while (p < end)
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*p++ ^= _encbyte;
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}
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return realLen;
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}
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#pragma mark -
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#pragma mark --- ScummDiskImage ---
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#pragma mark -
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static const int maniacResourcesPerFile[55] = {
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0, 11, 1, 3, 9, 12, 1, 13, 10, 6,
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4, 1, 7, 1, 1, 2, 7, 8, 19, 9,
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6, 9, 2, 6, 8, 4, 16, 8, 3, 3,
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12, 12, 2, 8, 1, 1, 2, 1, 9, 1,
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3, 7, 3, 3, 13, 5, 4, 3, 1, 1,
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3, 10, 1, 0, 0
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};
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static const int zakResourcesPerFile[59] = {
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0, 29, 12, 14, 13, 4, 4, 10, 7, 4,
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14, 19, 5, 4, 7, 6, 11, 9, 4, 4,
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1, 3, 3, 5, 1, 9, 4, 10, 13, 6,
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7, 10, 2, 6, 1, 11, 2, 5, 7, 1,
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7, 1, 4, 2, 8, 6, 6, 6, 4, 13,
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3, 1, 2, 1, 2, 1, 10, 1, 1
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};
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static uint16 write_byte(Common::WriteStream *out, byte val) {
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val ^= 0xFF;
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if (out != 0)
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out->writeByte(val);
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return 1;
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}
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static uint16 write_word(Common::WriteStream *out, uint16 val) {
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val ^= 0xFFFF;
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if (out != 0)
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out->writeUint16LE(val);
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return 2;
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}
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ScummDiskImage::ScummDiskImage(const char *disk1, const char *disk2, GameSettings game)
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: _stream(0), _buf(0), _game(game),
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_disk1(disk1), _disk2(disk2), _openedDisk(0) {
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if (_game.id == GID_MANIAC) {
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_numGlobalObjects = 256;
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_numRooms = 55;
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_numCostumes = 25;
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_numScripts = 160;
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_numSounds = 70;
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_resourcesPerFile = maniacResourcesPerFile;
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} else {
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_numGlobalObjects = 775;
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_numRooms = 59;
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_numCostumes = 38;
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_numScripts = 155;
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_numSounds = 127;
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_resourcesPerFile = zakResourcesPerFile;
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}
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}
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void ScummDiskImage::setEnc(byte enc) {
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_stream->setEnc(enc);
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}
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byte ScummDiskImage::fileReadByte() {
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byte b = 0;
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File::read(&b, 1);
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return b;
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}
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uint16 ScummDiskImage::fileReadUint16LE() {
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uint16 a = fileReadByte();
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uint16 b = fileReadByte();
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return a | (b << 8);
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}
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bool ScummDiskImage::openDisk(char num) {
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if (num == '1')
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num = 1;
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if (num == '2')
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num = 2;
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if (_openedDisk != num || !File::isOpen()) {
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if (File::isOpen())
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File::close();
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if (num == 1)
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File::open(_disk1);
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else if (num == 2)
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File::open(_disk2);
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else {
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error("ScummDiskImage::open(): wrong disk (%c)", num);
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return false;
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}
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_openedDisk = num;
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if (!File::isOpen()) {
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error("ScummDiskImage::open(): cannot open disk (%d)", num);
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return false;
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}
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}
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return true;
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}
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bool ScummDiskImage::open(const Common::String &filename) {
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uint16 signature;
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// check signature
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openDisk(1);
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if (_game.platform == Common::kPlatformApple2GS) {
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File::seek(142080);
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} else {
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File::seek(0);
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}
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signature = fileReadUint16LE();
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if (signature != 0x0A31) {
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error("ScummDiskImage::open(): signature not found in disk 1");
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return false;
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}
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extractIndex(0); // Fill in resource arrays
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openDisk(2);
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if (_game.platform == Common::kPlatformApple2GS) {
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File::seek(143104);
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signature = fileReadUint16LE();
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if (signature != 0x0032)
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error("Error: signature not found in disk 2");
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} else {
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File::seek(0);
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signature = fileReadUint16LE();
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if (signature != 0x0132)
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error("Error: signature not found in disk 2");
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}
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return true;
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}
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uint16 ScummDiskImage::extractIndex(Common::WriteStream *out) {
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int i;
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uint16 reslen = 0;
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openDisk(1);
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if (_game.platform == Common::kPlatformApple2GS) {
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File::seek(142080);
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} else {
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File::seek(0);
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}
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// skip signature
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fileReadUint16LE();
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// write expected signature
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if (_game.platform == Common::kPlatformApple2GS) {
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reslen += write_word(out, 0x0032);
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} else {
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reslen += write_word(out, 0x0132);
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}
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// copy object flags
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for (i = 0; i < _numGlobalObjects; i++)
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reslen += write_byte(out, fileReadByte());
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// copy room offsets
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for (i = 0; i < _numRooms; i++) {
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_roomDisks[i] = fileReadByte();
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reslen += write_byte(out, _roomDisks[i]);
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}
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for (i = 0; i < _numRooms; i++) {
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_roomSectors[i] = fileReadByte();
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reslen += write_byte(out, _roomSectors[i]);
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_roomTracks[i] = fileReadByte();
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reslen += write_byte(out, _roomTracks[i]);
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}
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for (i = 0; i < _numCostumes; i++)
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reslen += write_byte(out, fileReadByte());
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for (i = 0; i < _numCostumes; i++)
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reslen += write_word(out, fileReadUint16LE());
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for (i = 0; i < _numScripts; i++)
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reslen += write_byte(out, fileReadByte());
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for (i = 0; i < _numScripts; i++)
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reslen += write_word(out, fileReadUint16LE());
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for (i = 0; i < _numSounds; i++)
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reslen += write_byte(out, fileReadByte());
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for (i = 0; i < _numSounds; i++)
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reslen += write_word(out, fileReadUint16LE());
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return reslen;
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}
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bool ScummDiskImage::generateIndex() {
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int bufsize;
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bufsize = extractIndex(0);
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free(_buf);
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_buf = (byte *)calloc(1, bufsize);
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Common::MemoryWriteStream out(_buf, bufsize);
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extractIndex(&out);
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delete _stream;
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_stream = new Common::MemoryReadStream(_buf, bufsize);
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return true;
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}
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uint16 ScummDiskImage::extractResource(Common::WriteStream *out, int res) {
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const int AppleSectorOffset[36] = {
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0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256,
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272, 288, 304, 320, 336, 352, 368,
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384, 400, 416, 432, 448, 464,
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480, 496, 512, 528, 544, 560
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};
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const int C64SectorOffset[36] = {
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0,
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0, 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336,
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357, 376, 395, 414, 433, 452, 471,
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490, 508, 526, 544, 562, 580,
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598, 615, 632, 649, 666
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};
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int i;
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uint16 reslen = 0;
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openDisk(_roomDisks[res]);
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if (_game.platform == Common::kPlatformApple2GS) {
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File::seek((AppleSectorOffset[_roomTracks[res]] + _roomSectors[res]) * 256);
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} else {
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File::seek((C64SectorOffset[_roomTracks[res]] + _roomSectors[res]) * 256);
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}
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for (i = 0; i < _resourcesPerFile[res]; i++) {
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uint16 len;
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do {
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// Note: len might be 0xFFFF for padding in zak-c64-german
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len = fileReadUint16LE();
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reslen += write_word(out, len);
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} while (len == 0xFFFF);
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for (len -= 2; len > 0; len--)
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reslen += write_byte(out, fileReadByte());
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}
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return reslen;
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}
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bool ScummDiskImage::generateResource(int res) {
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int bufsize;
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if (res >= _numRooms)
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return false;
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bufsize = extractResource(0, res);
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free(_buf);
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_buf = (byte *)calloc(1, bufsize);
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Common::MemoryWriteStream out(_buf, bufsize);
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extractResource(&out, res);
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delete _stream;
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_stream = new Common::MemoryReadStream(_buf, bufsize);
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return true;
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}
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void ScummDiskImage::close() {
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delete _stream;
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_stream = 0;
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free(_buf);
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_buf = 0;
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File::close();
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}
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bool ScummDiskImage::openSubFile(const Common::String &filename) {
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assert(isOpen());
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const char *ext = strrchr(filename.c_str(), '.');
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char resNum[3];
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int res;
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// We always have file name in form of XX.lfl
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resNum[0] = ext[-2];
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resNum[1] = ext[-1];
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resNum[2] = 0;
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res = atoi(resNum);
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if (res == 0) {
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return generateIndex();
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} else {
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return generateResource(res);
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}
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return true;
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}
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} // End of namespace Scumm
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