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Diffstat (limited to 'engines/bladerunner/archive.cpp')
| -rw-r--r-- | engines/bladerunner/archive.cpp | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/engines/bladerunner/archive.cpp b/engines/bladerunner/archive.cpp new file mode 100644 index 0000000000..93c122f9af --- /dev/null +++ b/engines/bladerunner/archive.cpp @@ -0,0 +1,158 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#include "bladerunner/archive.h" + +#include "common/debug.h" + +namespace BladeRunner { + +MIXArchive::MIXArchive() { +} + +MIXArchive::~MIXArchive() { + if (_fd.isOpen()) + debug("~MIXArchive: fd not closed: %s", _fd.getName()); +} + +bool MIXArchive::open(const Common::String &filename) { + if (!_fd.open(filename)) { + debug("MIXArchive::open(): Could not open %s", filename.c_str()); + return false; + } + + _isTLK = filename.hasSuffix(".TLK"); + + _entry_count = _fd.readUint16LE(); + _size = _fd.readUint32LE(); + + _entries.resize(_entry_count); + for (uint16 i = 0; i != _entry_count; ++i) { + _entries[i].id = _fd.readSint32LE(); + _entries[i].offset = _fd.readUint32LE(); + _entries[i].length = _fd.readUint32LE(); + + if (false) + debug("%08x %-12d %-12d", _entries[i].id, _entries[i].offset, _entries[i].length); + + // Verify that the entries are sorted by id. Note that id is signed. + if (i > 0) + assert(_entries[i].id > _entries[i - 1].id); + } + + if (_fd.err()) { + error("MIXArchive::open(): Error reading entries in %s", filename.c_str()); + _fd.close(); + return false; + } + + debug("MIXArchive::open: Opened archive %s", filename.c_str()); + + return true; +} + +void MIXArchive::close() { + return _fd.close(); +} + +bool MIXArchive::isOpen() const { + return _fd.isOpen(); +} + +#define ROL(n) ((n << 1) | ((n >> 31) & 1)) + +static +int32 mix_id(const Common::String &name) { + char buffer[12] = { 0 }; + + for (uint i = 0; i != name.size() && i < 12u; ++i) + buffer[i] = (char)toupper(name[i]); + + uint32 id = 0; + for (int i = 0; i < 12 && buffer[i]; i += 4) + { + uint32 t = (uint32)buffer[i + 3] << 24 + | (uint32)buffer[i + 2] << 16 + | (uint32)buffer[i + 1] << 8 + | (uint32)buffer[i + 0]; + + id = ROL(id) + t; + } + + return reinterpret_cast<int32&>(id); +} + +static +int32 tlk_id(const Common::String &name) { + char buffer[12] = { 0 }; + + for (uint i = 0; i != name.size() && i < 12u; ++i) + buffer[i] = (char)toupper(name[i]); + + int actor_id = 10 * (name[0] - '0') + + (name[1] - '0'); + + int speech_id = 1000 * (name[3] - '0') + + 100 * (name[4] - '0') + + 10 * (name[5] - '0') + + (name[6] - '0'); + + return 10000 * actor_id + speech_id; +} + +uint32 MIXArchive::indexForId(int32 id) const { + uint32 lo = 0, hi = _entry_count; + + while (lo < hi) + { + uint32 mid = lo + (hi - lo) / 2; + + if (id > _entries[mid].id) + lo = mid + 1; + else if (id < _entries[mid].id) + hi = mid; + else + return mid; + } + return _entry_count; +} + +Common::SeekableReadStream *MIXArchive::createReadStreamForMember(const Common::String &name) { + int32 id; + + if (_isTLK) + id = tlk_id(name); + else + id = mix_id(name); + + uint32 i = indexForId(id); + + if (i == _entry_count) + return NULL; + + uint32 start = _entries[i].offset + 6 + 12 * _entry_count; + uint32 end = _entries[i].length + start; + + return new Common::SafeSeekableSubReadStream(&_fd, start, end, DisposeAfterUse::NO); +} + +} // End of namespace BladeRunner |