mirror of
https://github.com/libretro/scummvm.git
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137 lines
4.3 KiB
C++
137 lines
4.3 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/array.h"
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#include "common/compression/deflate.h"
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#include "common/debug.h"
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#include "common/ptr.h"
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#include "common/substream.h"
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#include "common/memstream.h"
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#include "common/compression/rnc_deco.h"
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#include "common/file.h"
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#include "dreamweb/rnca_archive.h"
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namespace DreamWeb {
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RNCAArchive* RNCAArchive::open(Common::SeekableReadStream *stream, DisposeAfterUse::Flag dispose) {
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FileMap files;
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if (stream->readUint32BE() != 0x524e4341)
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return nullptr;
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uint16 metadataSize1 = stream->readUint16BE();
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stream->readUint16BE(); // No idea
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uint16 metadataSize2 = stream->readUint16BE();
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stream->readByte(); // Always zero
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if (metadataSize1 != metadataSize2 || metadataSize1 < 15)
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return nullptr;
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int headerlessMetadataSize = metadataSize1 - 11;
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byte *metadata = new byte[headerlessMetadataSize];
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stream->read(metadata, headerlessMetadataSize);
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const byte *eptr = metadata;
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while (eptr < metadata + headerlessMetadataSize - 5) {
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const byte *ptr = eptr;
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while (*ptr)
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ptr++;
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Common::String fileName((const char *) eptr, ptr - eptr);
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ptr++;
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uint32 off = READ_BE_UINT32(ptr);
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eptr = ptr + 4;
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files[Common::Path(fileName, Common::Path::kNoSeparator)] = RNCAFileDescriptor(fileName, off);
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}
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delete[] metadata;
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return new RNCAArchive(files, stream, dispose);
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}
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bool RNCAArchive::hasFile(const Common::Path &path) const {
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return _files.contains(translatePath(path));
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}
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int RNCAArchive::listMembers(Common::ArchiveMemberList &list) const {
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for (FileMap::const_iterator i = _files.begin(), end = _files.end(); i != end; ++i) {
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list.push_back(Common::ArchiveMemberList::value_type(new Common::GenericArchiveMember(i->_key, *this)));
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}
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return _files.size();
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}
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const Common::ArchiveMemberPtr RNCAArchive::getMember(const Common::Path &path) const {
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Common::Path translated = translatePath(path);
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if (!_files.contains(translated))
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return nullptr;
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return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(_files.getVal(translated)._fileName, *this));
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}
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Common::SharedArchiveContents RNCAArchive::readContentsForPath(const Common::Path &translated) const {
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if (!_files.contains(translated))
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return Common::SharedArchiveContents();
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const RNCAFileDescriptor& desc = _files.getVal(translated);
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_stream->seek(desc._fileDataOffset);
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if (_stream->readUint32BE() != Common::RncDecoder::kRnc1Signature) {
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return Common::SharedArchiveContents();
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}
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// Read unpacked/packed file length
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uint32 unpackLen = _stream->readUint32BE();
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uint32 packLen = _stream->readUint32BE();
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if (unpackLen > 0x7ffff000 || packLen > 0x7ffff000) {
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debug("Header error for %s", desc._fileName.c_str());
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return Common::SharedArchiveContents();
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}
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// Rewind back the header
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_stream->seek(desc._fileDataOffset);
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packLen += 0x12;
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byte *compressedBuffer = new byte[packLen];
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if (_stream->read(compressedBuffer, packLen) != packLen) {
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debug("Read error for %s", desc._fileName.c_str());
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return Common::SharedArchiveContents();
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}
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byte *uncompressedBuffer = new byte[unpackLen];
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Common::RncDecoder rnc;
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if (rnc.unpackM1(compressedBuffer, packLen, uncompressedBuffer) != (int32) unpackLen) {
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debug("Unpacking error for %s", desc._fileName.c_str());
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return Common::SharedArchiveContents();
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}
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byte b = 0;
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for (byte *ptr = uncompressedBuffer; ptr < uncompressedBuffer + unpackLen; ptr++) {
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b += *ptr;
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*ptr = b;
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}
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return Common::SharedArchiveContents(uncompressedBuffer, unpackLen);
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}
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} // End of namespace DreamWeb
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