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https://github.com/scummvm/scummvm.git
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9db7dc73aa
This creates a specific translation unit for the code making use of ScummEngine while keeping file.cpp for the classes needed for the detection code. This allows to build with UBSan while the Scumm engine is disabled.
377 lines
8.6 KiB
C++
377 lines
8.6 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 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 "scumm/file.h"
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#include "common/memstream.h"
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namespace Scumm {
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/**
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* This file must only contain file reading classes needed for the detection code.
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* These classes must not reference the ScummEngine class.
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*/
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void BaseScummFile::close() {
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_baseStream.reset();
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_debugName.clear();
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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 maniacDemoResourcesPerFile[55] = {
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0, 12, 0, 2, 1, 12, 1, 13, 6, 0,
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31, 0, 1, 0, 0, 0, 0, 1, 1, 1,
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0, 1, 0, 0, 2, 0, 0, 1, 0, 0,
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2, 7, 1, 11, 0, 0, 5, 1, 0, 0,
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1, 0, 1, 3, 4, 3, 1, 0, 0, 1,
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2, 2, 0, 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 != nullptr)
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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 != nullptr)
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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(nullptr), _buf(nullptr), _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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if (_game.features & GF_DEMO) {
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_numScripts = 55;
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_numSounds = 40;
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_resourcesPerFile = maniacDemoResourcesPerFile;
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} else {
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_numScripts = 160;
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_numSounds = 70;
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_resourcesPerFile = maniacResourcesPerFile;
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}
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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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byte ScummDiskImage::fileReadByte() {
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byte b = 0;
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_baseStream->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 || !_baseStream) {
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if (num == 1) {
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_baseStream.reset(SearchMan.createReadStreamForMember(Common::Path(_disk1)));
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_debugName = _disk1;
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} else if (num == 2) {
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_baseStream.reset(SearchMan.createReadStreamForMember(Common::Path(_disk2)));
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_debugName = _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 (!_baseStream) {
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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::Path &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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_baseStream->seek(142080);
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} else {
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_baseStream->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(nullptr); // Fill in resource arrays
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if (_game.features & GF_DEMO)
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return true;
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openDisk(2);
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if (_game.platform == Common::kPlatformApple2GS) {
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_baseStream->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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_baseStream->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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_baseStream->seek(142080);
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} else {
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_baseStream->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(nullptr);
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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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_baseStream->seek((AppleSectorOffset[_roomTracks[res]] + _roomSectors[res]) * 256);
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} else {
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_baseStream->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(nullptr, 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 = nullptr;
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free(_buf);
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_buf = nullptr;
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_baseStream.reset();
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_debugName.clear();
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}
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bool ScummDiskImage::openSubFile(const Common::Path &filename) {
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assert(_baseStream);
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Common::String basename = filename.baseName();
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const char *ext = strrchr(basename.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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uint32 ScummDiskImage::read(void *dataPtr, uint32 dataSize) {
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uint32 realLen = _stream->read(dataPtr, dataSize);
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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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} // End of namespace Scumm
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