mirror of
https://github.com/scummvm/scummvm.git
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236 lines
6.7 KiB
C++
236 lines
6.7 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 "common/file.h"
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#include "common/memstream.h"
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#include "common/textconsole.h"
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#include "mm/shared/xeen/cc_archive.h"
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namespace MM {
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namespace Shared {
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namespace Xeen {
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uint16 BaseCCArchive::convertNameToId(const Common::Path &resourceName) {
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Common::String name = resourceName.baseName();
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if (resourceName.empty() || name.hasSuffix("."))
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return 0xffff;
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name.toUppercase();
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// Check if a resource number is being directly specified
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if (name.size() == 4) {
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char *endPtr;
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uint16 num = (uint16)strtol(name.c_str(), &endPtr, 16);
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if (!*endPtr)
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return num;
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}
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const byte *msgP = (const byte *)name.c_str();
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int total = *msgP++;
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for (; *msgP; total += *msgP++) {
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// Rotate the bits in 'total' right 7 places
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total = (total & 0x007F) << 9 | (total & 0xFF80) >> 7;
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}
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return total;
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}
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void BaseCCArchive::loadIndex(Common::SeekableReadStream &stream) {
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int count = stream.readUint16LE();
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size_t size = count * 8;
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// Read in the data for the archive's index
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byte *rawIndex = new byte[size];
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if (stream.read(rawIndex, size) != size) {
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delete[] rawIndex;
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error("Failed to read %zu bytes from CC file", size);
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}
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// Decrypt the index
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int seed = 0xac;
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for (int i = 0; i < count * 8; ++i, seed += 0x67) {
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rawIndex[i] = (byte)((((rawIndex[i] << 2) | (rawIndex[i] >> 6)) + seed) & 0xff);
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}
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// Extract the index data into entry structures
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_index.resize(count);
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const byte *entryP = &rawIndex[0];
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for (int idx = 0; idx < count; ++idx, entryP += 8) {
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CCEntry entry;
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entry._id = READ_LE_UINT16(entryP);
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entry._offset = READ_LE_UINT32(entryP + 2) & 0xffffff;
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entry._size = READ_LE_UINT16(entryP + 5);
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assert(!entryP[7]);
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_index[idx] = entry;
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}
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delete[] rawIndex;
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}
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void BaseCCArchive::saveIndex(Common::WriteStream &stream) {
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// Fill up the data for the index entries into a raw data block
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byte *rawIndex = new byte[_index.size() * 8];
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byte b;
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byte *entryP = rawIndex;
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for (uint i = 0; i < _index.size(); ++i, entryP += 8) {
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CCEntry &entry = _index[i];
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WRITE_LE_UINT16(&entryP[0], entry._id);
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WRITE_LE_UINT32(&entryP[2], entry._writeOffset);
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WRITE_LE_UINT16(&entryP[5], entry._size);
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entryP[7] = 0;
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}
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// Encrypt the index
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int seed = 0xac;
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for (uint i = 0; i < _index.size() * 8; ++i, seed += 0x67) {
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b = (rawIndex[i] - seed) & 0xff;
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b = (byte)((b >> 2) | (b << 6));
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assert(rawIndex[i] == (byte)((((b << 2) | (b >> 6)) + seed) & 0xff));
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rawIndex[i] = b;
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}
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// Write out the number of entries and the encrypted index data
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stream.writeUint16LE(_index.size());
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stream.write(rawIndex, _index.size() * 8);
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delete[] rawIndex;
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}
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bool BaseCCArchive::hasFile(const Common::Path &path) const {
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CCEntry ccEntry;
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return getHeaderEntry(path, ccEntry);
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}
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bool BaseCCArchive::getHeaderEntry(const Common::Path &resourceName, CCEntry &ccEntry) const {
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return getHeaderEntry(convertNameToId(resourceName), ccEntry);
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}
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bool BaseCCArchive::getHeaderEntry(uint16 id, CCEntry &ccEntry) const {
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// Loop through the index
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for (uint i = 0; i < _index.size(); ++i) {
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if (_index[i]._id == id) {
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ccEntry = _index[i];
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return true;
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}
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}
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// Could not find an entry
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return false;
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}
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const Common::ArchiveMemberPtr BaseCCArchive::getMember(const Common::Path &path) const {
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if (!hasFile(path))
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return Common::ArchiveMemberPtr();
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return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(path, *this));
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}
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int BaseCCArchive::listMembers(Common::ArchiveMemberList &list) const {
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// CC files don't maintain the original filenames, so we can't list it
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return 0;
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}
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/*------------------------------------------------------------------------*/
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CCArchive::CCArchive(const Common::Path &filename, bool encoded) :
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BaseCCArchive(), _filename(filename), _encoded(encoded) {
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Common::File f;
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if (!f.open(filename, SearchMan))
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error("Could not open file - %s", filename.toString(Common::Path::kNativeSeparator).c_str());
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loadIndex(f);
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}
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CCArchive::CCArchive(const Common::Path &filename, const Common::String &prefix,
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bool encoded) : BaseCCArchive(), _filename(filename),
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_prefix(prefix), _encoded(encoded) {
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_prefix.toLowercase();
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Common::File f;
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if (!f.open(filename, SearchMan))
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error("Could not open file - %s", filename.toString(Common::Path::kNativeSeparator).c_str());
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loadIndex(f);
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}
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CCArchive::~CCArchive() {
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}
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bool CCArchive::getHeaderEntry(const Common::Path &resourceName, Shared::Xeen::CCEntry &ccEntry) const {
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Common::String resName = resourceName.baseName();
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if (!_prefix.empty() && resName.contains('|')) {
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resName.toLowercase();
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Common::String prefix = _prefix + "|";
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if (!strncmp(resName.c_str(), prefix.c_str(), prefix.size()))
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// Matching CC prefix, so strip it off and allow processing to
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// continue onto the base getHeaderEntry method
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resName = Common::String(resName.c_str() + prefix.size());
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else
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// Not matching prefix, so don't allow a match
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return false;
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}
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return BaseCCArchive::getHeaderEntry(resourceName.getParent().appendComponent(resName), ccEntry);
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}
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Common::SeekableReadStream *CCArchive::createReadStreamForMember(const Common::Path &path) const {
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Shared::Xeen::CCEntry ccEntry;
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if (getHeaderEntry(path, ccEntry)) {
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// Open the correct CC file
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Common::File f;
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if (!f.open(_filename))
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error("Could not open CC file");
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// Read in the data for the specific resource
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if (!f.seek(ccEntry._offset))
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error("Failed to seek to %d bytes in CC file", ccEntry._offset);
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byte *data = (byte *)malloc(ccEntry._size);
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if (f.read(data, ccEntry._size) != ccEntry._size) {
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free(data);
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error("Failed to read %hu bytes in CC file", ccEntry._size);
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}
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if (_encoded) {
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// Decrypt the data
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for (int i = 0; i < ccEntry._size; ++i)
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data[i] ^= 0x35;
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}
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// Return the data as a stream
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return new Common::MemoryReadStream(data, ccEntry._size, DisposeAfterUse::YES);
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}
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return nullptr;
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}
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} // namespace Xeen
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} // namespace Shared
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} // namespace MM
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