mirror of
https://github.com/libretro/scummvm.git
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458 lines
10 KiB
C++
458 lines
10 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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*/
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#include "common/endian.h"
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#include "common/types.h"
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#include "common/memstream.h"
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#include "common/substream.h"
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#include "gob/gob.h"
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#include "gob/dataio.h"
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#include "gob/global.h"
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#include "gob/util.h"
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namespace Gob {
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DataIO::File::File() : size(0), offset(0), compression(0), archive(0) {
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}
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DataIO::File::File(const Common::String &n, uint32 s, uint32 o, uint8 c, Archive &a) :
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name(n), size(s), offset(o), compression(c), archive(&a) {
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}
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DataIO::DataIO() {
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// Reserve memory for the standard max amount of archives
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_archives.reserve(kMaxArchives);
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for (int i = 0; i < kMaxArchives; i++)
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_archives.push_back(0);
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}
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DataIO::~DataIO() {
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// Close all archives
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for (Common::Array<Archive *>::iterator it = _archives.begin(); it != _archives.end(); ++it) {
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if (!*it)
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continue;
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closeArchive(**it);
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delete *it;
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}
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}
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void DataIO::getArchiveInfo(Common::Array<ArchiveInfo> &info) const {
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info.resize(_archives.size());
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for (uint i = 0; i < _archives.size(); i++) {
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if (!_archives[i])
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continue;
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info[i].name = _archives[i]->name;
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info[i].base = _archives[i]->base;
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info[i].fileCount = _archives[i]->files.size();
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}
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}
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uint32 DataIO::getSizeChunks(Common::SeekableReadStream &src) {
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uint32 size = 0;
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uint32 chunkSize = 2, realSize;
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while (chunkSize != 0xFFFF) {
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src.skip(chunkSize - 2);
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chunkSize = src.readUint16LE();
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realSize = src.readUint16LE();
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assert(chunkSize >= 4);
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size += realSize;
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}
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assert(!src.eos());
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src.seek(0);
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return size;
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}
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byte *DataIO::unpack(Common::SeekableReadStream &src, int32 &size, uint8 compression, bool useMalloc) {
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assert((compression == 1) || (compression == 2));
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if (compression == 1)
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size = src.readUint32LE();
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else if (compression == 2)
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size = getSizeChunks(src);
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assert(size > 0);
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byte *data = 0;
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if (useMalloc)
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data = (byte *) malloc(size);
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else
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data = new byte[size];
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if (compression == 1)
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unpackChunk(src, data, size);
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else if (compression == 2)
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unpackChunks(src, data, size);
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return data;
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}
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byte *DataIO::unpack(const byte *src, uint32 srcSize, int32 &size, uint8 compression) {
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Common::MemoryReadStream srcStream(src, srcSize);
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return unpack(srcStream, size, compression, false);
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}
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Common::SeekableReadStream *DataIO::unpack(Common::SeekableReadStream &src, uint8 compression) {
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int32 size;
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byte *data = unpack(src, size, compression, true);
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if (!data)
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return 0;
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return new Common::MemoryReadStream(data, size, DisposeAfterUse::YES);
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}
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void DataIO::unpackChunks(Common::SeekableReadStream &src, byte *dest, uint32 size) {
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uint32 chunkSize = 0, realSize;
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while (chunkSize != 0xFFFF) {
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uint32 pos = src.pos();
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chunkSize = src.readUint16LE();
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realSize = src.readUint16LE();
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assert(chunkSize >= 4);
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assert(size >= realSize);
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src.skip(2);
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unpackChunk(src, dest, realSize);
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if (chunkSize != 0xFFFF)
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src.seek(pos + chunkSize + 2);
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size -= realSize;
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dest += realSize;
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}
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}
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void DataIO::unpackChunk(Common::SeekableReadStream &src, byte *dest, uint32 size) {
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byte *tmpBuf = new byte[4114];
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assert(tmpBuf);
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uint32 counter = size;
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for (int i = 0; i < 4078; i++)
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tmpBuf[i] = 0x20;
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uint16 tmpIndex = 4078;
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uint16 cmd = 0;
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while (1) {
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cmd >>= 1;
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if ((cmd & 0x0100) == 0)
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cmd = src.readByte() | 0xFF00;
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if ((cmd & 1) != 0) { /* copy */
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byte tmp = src.readByte();
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*dest++ = tmp;
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tmpBuf[tmpIndex] = tmp;
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tmpIndex++;
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tmpIndex %= 4096;
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counter--;
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if (counter == 0)
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break;
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} else { /* copy string */
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byte tmp1 = src.readByte();
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byte tmp2 = src.readByte();
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int16 off = tmp1 | ((tmp2 & 0xF0) << 4);
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byte len = (tmp2 & 0x0F) + 3;
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for (int i = 0; i < len; i++) {
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*dest++ = tmpBuf[(off + i) % 4096];
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counter--;
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if (counter == 0) {
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delete[] tmpBuf;
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return;
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}
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tmpBuf[tmpIndex] = tmpBuf[(off + i) % 4096];
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tmpIndex++;
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tmpIndex %= 4096;
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}
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}
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}
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delete[] tmpBuf;
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}
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bool DataIO::openArchive(Common::String name, bool base) {
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// Look for a free archive slot
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Archive **archive = 0;
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int i = 0;
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for (Common::Array<Archive *>::iterator it = _archives.begin(); it != _archives.end(); ++it, i++) {
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if (!*it) {
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archive = &*it;
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break;
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}
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}
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if (!archive) {
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// No free slot, create a new one
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warning("DataIO::openArchive(): Need to increase archive count to %d", _archives.size() + 1);
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_archives.push_back(0);
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Common::Array<Archive *>::iterator it = _archives.end();
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archive = &*(--it);
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}
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// Add extension if necessary
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if (!name.contains('.'))
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name += ".stk";
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// Try to open
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*archive = openArchive(name);
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if (!*archive)
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return false;
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(*archive)->base = base;
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return true;
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}
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DataIO::Archive *DataIO::openArchive(const Common::String &name) {
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Archive *archive = new Archive;
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if (!archive->file.open(name)) {
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delete archive;
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return 0;
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}
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archive->name = name;
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uint16 fileCount = archive->file.readUint16LE();
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for (uint16 i = 0; i < fileCount; i++) {
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File file;
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char fileName[14];
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archive->file.read(fileName, 13);
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fileName[13] = '\0';
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file.size = archive->file.readUint32LE();
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file.offset = archive->file.readUint32LE();
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file.compression = archive->file.readByte() != 0;
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// Replacing cyrillic characters
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Util::replaceChar(fileName, (char) 0x85, 'E');
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Util::replaceChar(fileName, (char) 0x8A, 'K');
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Util::replaceChar(fileName, (char) 0x8E, 'O');
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Util::replaceChar(fileName, (char) 0x91, 'C');
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Util::replaceChar(fileName, (char) 0x92, 'T');
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file.name = fileName;
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// Geisha use 0ot files, which are compressed TOT files without the packed byte set.
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if (file.name.hasSuffix(".0OT")) {
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file.name.setChar('T', file.name.size() - 3);
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file.compression = 2;
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}
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file.archive = archive;
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archive->files.setVal(file.name, file);
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}
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return archive;
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}
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bool DataIO::closeArchive(bool base) {
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// Look for a matching archive and close it
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for (int archive = _archives.size() - 1; archive >= 0; archive--) {
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if (_archives[archive] && (_archives[archive]->base == base)) {
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closeArchive(*_archives[archive]);
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delete _archives[archive];
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_archives[archive] = 0;
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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 DataIO::closeArchive(Archive &archive) {
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archive.file.close();
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return true;
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}
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bool DataIO::hasFile(const Common::String &name){
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// Look up the files in the opened archives
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if (findFile(name))
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return true;
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// Else, look if a plain file that matches exists
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return Common::File::exists(name);
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}
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int32 DataIO::fileSize(const Common::String &name) {
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// Try to find the file in the archives
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File *file = findFile(name);
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if (file) {
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if (file->compression == 0)
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return file->size;
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// Sanity checks
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assert(file->size >= 4);
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assert(file->archive);
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assert(file->archive->file.isOpen());
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// Read the full, unpacked size
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file->archive->file.seek(file->offset);
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if (file->compression == 2)
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file->archive->file.skip(4);
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return file->archive->file.readUint32LE();
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}
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// Else, try to find a matching plain file
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Common::File f;
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if (!f.open(name))
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return -1;
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return f.size();
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}
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Common::SeekableReadStream *DataIO::getFile(const Common::String &name) {
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// Try to open the file in the archives
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File *file = findFile(name);
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if (file) {
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Common::SeekableReadStream *data = getFile(*file);
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if (data)
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return data;
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}
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// Else, try to open a matching plain file
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Common::File f;
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if (!f.open(name))
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return 0;
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return f.readStream(f.size());
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}
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byte *DataIO::getFile(const Common::String &name, int32 &size) {
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// Try to open the file in the archives
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File *file = findFile(name);
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if (file) {
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byte *data = getFile(*file, size);
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if (data)
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return data;
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}
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// Else, try to open a matching plain file
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Common::File f;
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if (!f.open(name))
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return 0;
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size = f.size();
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byte *data = new byte[size];
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if (f.read(data, size) != ((uint32) size)) {
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delete[] data;
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return 0;
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}
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return data;
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}
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DataIO::File *DataIO::findFile(const Common::String &name) {
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for (int i = _archives.size() - 1; i >= 0; i--) {
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Archive *archive = _archives[i];
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if (!archive)
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// Empty slot
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continue;
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// Look up the file in the file map
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FileMap::iterator file = archive->files.find(name);
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if (file != archive->files.end())
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return &file->_value;
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}
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return 0;
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}
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Common::SeekableReadStream *DataIO::getFile(File &file) {
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if (!file.archive)
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return 0;
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if (!file.archive->file.isOpen())
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return 0;
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if (!file.archive->file.seek(file.offset))
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return 0;
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Common::SeekableReadStream *rawData =
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new Common::SafeSeekableSubReadStream(&file.archive->file, file.offset, file.offset + file.size);
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if (file.compression == 0)
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return rawData;
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Common::SeekableReadStream *unpackedData = unpack(*rawData, file.compression);
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delete rawData;
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return unpackedData;
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}
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byte *DataIO::getFile(File &file, int32 &size) {
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if (!file.archive)
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return 0;
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if (!file.archive->file.isOpen())
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return 0;
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if (!file.archive->file.seek(file.offset))
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return 0;
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size = file.size;
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byte *rawData = new byte[file.size];
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if (file.archive->file.read(rawData, file.size) != file.size) {
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delete[] rawData;
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return 0;
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}
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if (file.compression == 0)
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return rawData;
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byte *unpackedData = unpack(rawData, file.size, size, file.compression);
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delete[] rawData;
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return unpackedData;
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}
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} // End of namespace Gob
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