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/* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/memstream.h"
#include "common/formats/iff_container.h"
#include "engines/nancy/nancy.h"
#include "engines/nancy/iff.h"
#include "engines/nancy/resource.h"
namespace Nancy {
IFF::IFF(Common::SeekableReadStream *stream) {
// Scan the file for FORM/DATA wrapper chunks. There can be several of these in a single IFF.
uint32 dataString = g_nancy->getGameType() == kGameTypeVampire ? ID_FORM : ID_DATA;
_stream = stream;
while (stream->pos() < stream->size() - 3) {
_nextDATAChunk = 0;
uint32 id = stream->readUint32BE();
stream->seek(-4, SEEK_CUR);
if (id == dataString) {
Common::IFFParser iff(stream, false, dataString);
Common::Functor1Mem<Common::IFFChunk &, bool, IFF> c(this, &IFF::callback);
iff.parse(c);
if (_nextDATAChunk) {
stream->seek(_nextDATAChunk);
}
} else {
stream->skip(1);
}
}
delete _stream;
_stream = nullptr;
}
IFF::~IFF() {
for (uint i = 0; i < _chunks.size(); i++)
delete[] _chunks[i].buf;
}
bool IFF::callback(Common::IFFChunk &c) {
Chunk chunk;
// Replace invalid NULs with spaces
char id[4];
WRITE_BE_UINT32(id, c._type);
for (uint i = 0; i < 4; ++i) {
if (id[i] == 0)
id[i] = ' ';
}
chunk.id = READ_BE_UINT32(id);
if (chunk.id == (g_nancy->getGameType() == kGameTypeVampire ? ID_FORM : ID_DATA)) {
// Encountered the next FORM/DATA wrapper. Signal that we need to stop reading the
// current one and mark where from the parser should be called next.
_nextDATAChunk = _stream->pos() - 8;
return true;
}
chunk.size = c._size;
chunk.buf = new byte[chunk.size];
c._stream->read(chunk.buf, chunk.size);
if (c._stream->err())
error("IFF::callback: error reading '%s' chunk", idToString(chunk.id).c_str());
debugN(3, "IFF::callback: Adding '%s' chunk\n", idToString(chunk.id).c_str());
_chunks.push_back(chunk);
return false;
}
const byte *IFF::getChunk(uint32 id, uint &size, uint index) const {
uint found = 0;
for (uint i = 0; i < _chunks.size(); ++i) {
const Chunk &chunk = _chunks[i];
if (chunk.id == id) {
if (found == index) {
size = chunk.size;
return chunk.buf;
}
++found;
}
}
return nullptr;
}
Common::SeekableReadStream *IFF::getChunkStream(const Common::String &id, uint index) const {
uint size;
const byte *chunk = getChunk(stringToId(id), size, index);
if (chunk) {
byte *dup = (byte *)malloc(size);
memcpy(dup, chunk, size);
return new Common::MemoryReadStream(dup, size, DisposeAfterUse::YES);
}
return nullptr;
}
Common::String IFF::idToString(uint32 id) {
Common::String s;
while (id) {
s += id >> 24;
id <<= 8;
}
return s;
}
uint32 IFF::stringToId(const Common::String &s) {
uint32 id = 0;
for (uint i = 0; i < 4; ++i)
id |= (s.size() > i ? s[i] : ' ') << (3 - i) * 8;
return id;
}
void IFF::list(Common::Array<Common::String> &nameList) const {
Common::String chunkName;
nameList.reserve(_chunks.size());
for (uint i = 0; i < _chunks.size(); ++i) {
chunkName = idToString(_chunks[i].id);
chunkName.trim();
nameList.push_back(chunkName);
}
}
} // End of namespace Nancy
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