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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 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 "sherlock/resources.h"
#include "sherlock/decompress.h"
#include "sherlock/screen.h"
#include "sherlock/sherlock.h"
#include "common/debug.h"
namespace Sherlock {
Cache::Cache() {
}
/**
* Returns true if a given file is currently being cached
*/
bool Cache::isCached(const Common::String &filename) const {
return _resources.contains(filename);
}
/**
* Loads a file into the cache if it's not already present, and returns it.
* If the file is LZW compressed, automatically decompresses it and loads
* the uncompressed version into memory
*/
void Cache::load(const Common::String &name) {
// First check if the entry already exists
if (_resources.contains(name))
return;
// Open the file for reading
Common::File f;
if (!f.open(name))
error("Could not read file - %s", name.c_str());
load(name, f);
f.close();
}
/**
* Load a cache entry based on a passed stream
*/
void Cache::load(const Common::String &name, Common::SeekableReadStream &stream) {
// First check if the entry already exists
if (_resources.contains(name))
return;
// Check whether the file is compressed
const char LZW_HEADER[5] = { "LZV\x1a" };
char header[5];
stream.read(header, 5);
bool isCompressed = !strncmp(header, LZW_HEADER, 5);
stream.seek(0);
// Allocate a new cache entry
_resources[name] = CacheEntry();
CacheEntry &cacheEntry = _resources[name];
if (isCompressed) {
// It's compressed, so decompress the file and store it's data in the cache entry
Common::SeekableReadStream *decompressed = decompressLZ(stream);
cacheEntry.resize(decompressed->size());
decompressed->read(&cacheEntry[0], decompressed->size());
delete decompressed;
} else {
// It's not, so read the raw data of the file into the cache entry
cacheEntry.resize(stream.size());
stream.read(&cacheEntry[0], stream.size());
}
}
/**
* Get a file from the cache
*/
Common::SeekableReadStream *Cache::get(const Common::String &filename) const {
// Return a memory stream that encapsulates the data
const CacheEntry &cacheEntry = _resources[filename];
return new Common::MemoryReadStream(&cacheEntry[0], cacheEntry.size());
}
/*----------------------------------------------------------------*/
Resources::Resources() {
_resourceIndex = -1;
addToCache("vgs.lib");
addToCache("talk.lib");
addToCache("journal.txt");
}
/**
* Adds the specified file to the cache. If it's a library file, takes care of
* loading it's index for future use
*/
void Resources::addToCache(const Common::String &filename) {
_cache.load(filename);
// Check to see if the file is a library
Common::SeekableReadStream *stream = load(filename);
uint32 header = stream->readUint32BE();
if (header == MKTAG('L', 'I', 'B', 26))
loadLibraryIndex(filename, stream, false);
else if (header == MKTAG('L', 'I', 'C', 26))
loadLibraryIndex(filename, stream, true);
delete stream;
}
/**
* Adds a resource from a library file to the cache
*/
void Resources::addToCache(const Common::String &filename, const Common::String &libFilename) {
// Get the resource
Common::SeekableReadStream *stream = load(filename, libFilename);
_cache.load(filename, *stream);
delete stream;
}
/**
* Adds a given stream to the cache under the given name
*/
void Resources::addToCache(const Common::String &filename, Common::SeekableReadStream &stream) {
_cache.load(filename, stream);
}
/**
* Returns a stream for a given file
*/
Common::SeekableReadStream *Resources::load(const Common::String &filename) {
// First check if the file is directly in the cache
if (_cache.isCached(filename))
return _cache.get(filename);
// Secondly, iterate through any loaded library file looking for a resource
// that has the same name
LibraryIndexes::iterator i;
for (i = _indexes.begin(); i != _indexes.end(); ++i) {
if ((*i)._value.contains(filename)) {
// Get a stream reference to the given library file
Common::SeekableReadStream *stream = load((*i)._key);
LibraryEntry &entry = (*i)._value[filename];
_resourceIndex = entry._index;
stream->seek(entry._offset);
Common::SeekableReadStream *resStream = stream->readStream(entry._size);
delete stream;
return resStream;
}
}
// At this point, fall back on a physical file with the given name
Common::File f;
if (!f.open(filename))
error("Could not load file - %s", filename.c_str());
Common::SeekableReadStream *stream = f.readStream(f.size());
f.close();
return stream;
}
/**
* Loads a specific resource from a given library file
*/
Common::SeekableReadStream *Resources::load(const Common::String &filename, const Common::String &libraryFile) {
// Open up the library for access
Common::SeekableReadStream *libStream = load(libraryFile);
// Check if the library has already had it's index read, and if not, load it
if (!_indexes.contains(libraryFile))
loadLibraryIndex(libraryFile, libStream, false);
// Extract the data for the specified resource and return it
LibraryEntry &entry = _indexes[libraryFile][filename];
libStream->seek(entry._offset);
Common::SeekableReadStream *stream = libStream->readStream(entry._size);
delete libStream;
return stream;
}
/**
* Returns true if the given file exists on disk or in the cache
*/
bool Resources::exists(const Common::String &filename) const {
Common::File f;
return f.exists(filename) || _cache.isCached(filename);
}
/**
* Reads in the index from a library file, and caches it's index for later use
*/
void Resources::loadLibraryIndex(const Common::String &libFilename,
Common::SeekableReadStream *stream, bool isNewStyle) {
uint32 offset, nextOffset;
// Create an index entry
_indexes[libFilename] = LibraryIndex();
LibraryIndex &index = _indexes[libFilename];
// Read in the number of resources
stream->seek(4);
int count = stream->readUint16LE();
if (isNewStyle)
stream->seek((count + 1) * 8, SEEK_CUR);
// Loop through reading in the entries
for (int idx = 0; idx < count; ++idx) {
// Read the name of the resource
char resName[13];
stream->read(resName, 13);
resName[12] = '\0';
// Read the offset
offset = stream->readUint32LE();
if (idx == (count - 1)) {
nextOffset = stream->size();
} else {
// Read the size by jumping forward to read the next entry's offset
stream->seek(13, SEEK_CUR);
nextOffset = stream->readUint32LE();
stream->seek(-17, SEEK_CUR);
}
// Add the entry to the index
index[resName] = LibraryEntry(idx, offset, nextOffset - offset);
}
}
/**
* Returns the index of the last loaded resource in it's given library file.
* This will be used primarily when loading talk files, so the engine can
* update the given conversation number in the journal
*/
int Resources::resourceIndex() const {
return _resourceIndex;
}
/*----------------------------------------------------------------*/
SherlockEngine *ImageFile::_vm;
void ImageFile::setVm(SherlockEngine *vm) {
_vm = vm;
}
ImageFile::ImageFile(const Common::String &name, bool skipPal, bool animImages) {
Common::SeekableReadStream *stream = _vm->_res->load(name);
Common::fill(&_palette[0], &_palette[PALETTE_SIZE], 0);
load(*stream, skipPal, animImages);
delete stream;
}
ImageFile::ImageFile(Common::SeekableReadStream &stream, bool skipPal) {
Common::fill(&_palette[0], &_palette[PALETTE_SIZE], 0);
load(stream, skipPal, false);
}
ImageFile::~ImageFile() {
for (uint idx = 0; idx < size(); ++idx)
(*this)[idx]._frame.free();
}
/**
* Load the data of the sprite
*/
void ImageFile::load(Common::SeekableReadStream &stream, bool skipPalette, bool animImages) {
loadPalette(stream);
int streamSize = stream.size();
while (stream.pos() < streamSize) {
ImageFrame frame;
frame._width = stream.readUint16LE() + 1;
frame._height = stream.readUint16LE() + 1;
frame._paletteBase = stream.readByte();
if (animImages) {
// Animation cutscene image files use a 16-bit x offset
frame._offset.x = stream.readUint16LE();
frame._rleEncoded = (frame._offset.x & 0xff) == 1;
frame._offset.y = stream.readByte();
} else {
// Standard image files have a separate byte for the RLE flag, and an 8-bit X offset
frame._rleEncoded = stream.readByte() == 1;
frame._offset.x = stream.readByte();
frame._offset.y = stream.readByte();
}
frame._offset.y = stream.readByte();
frame._rleEncoded = !skipPalette && frame._rleEncoded;
if (frame._paletteBase) {
// Nibble packed frame data
frame._size = (frame._width * frame._height) / 2;
} else if (frame._rleEncoded) {
// This size includes the header size, which we subtract
frame._size = stream.readUint16LE() - 11;
frame._rleMarker = stream.readByte();
} else {
// Uncompressed data
frame._size = frame._width * frame._height;
}
// Load data for frame and decompress it
byte *data = new byte[frame._size];
stream.read(data, frame._size);
decompressFrame(frame, data);
delete[] data;
push_back(frame);
}
}
/**
* Gets the palette at the start of the sprite file
*/
void ImageFile::loadPalette(Common::SeekableReadStream &stream) {
// Check for palette
int v1 = stream.readUint16LE() + 1;
int v2 = stream.readUint16LE() + 1;
stream.skip(1); // Skip paletteBase byte
bool rleEncoded = stream.readByte() == 1;
int palSize = v1 * v2;
if ((palSize - 12) == PALETTE_SIZE && !rleEncoded) {
// Found palette, so read it in
stream.seek(2 + 12, SEEK_CUR);
for (int idx = 0; idx < PALETTE_SIZE; ++idx)
_palette[idx] = VGA_COLOR_TRANS(stream.readByte());
} else {
// Not a palette, so rewind to start of frame data for normal frame processing
stream.seek(-6, SEEK_CUR);
}
}
/**
* Decompress a single frame for the sprite
*/
void ImageFile::decompressFrame(ImageFrame &frame, const byte *src) {
frame._frame.create(frame._width, frame._height, Graphics::PixelFormat::createFormatCLUT8());
if (frame._paletteBase) {
// Nibble-packed
byte *pDest = (byte *)frame._frame.getPixels();
for (uint idx = 0; idx < frame._size; ++idx, ++src) {
*pDest++ = *src & 0xF;
*pDest++ = (*src >> 4);
}
} else if (frame._rleEncoded) {
// RLE encoded
byte *dst = (byte *)frame._frame.getPixels();
int frameSize = frame._width * frame._height;
while (frameSize > 0) {
if (*src == frame._rleMarker) {
byte rleColor = src[1];
byte rleCount = src[2];
src += 3;
frameSize -= rleCount;
while (rleCount--)
*dst++ = rleColor;
} else {
*dst++ = *src++;
--frameSize;
}
}
assert(frameSize == 0);
} else {
// Uncompressed frame
Common::copy(src, src + frame._width * frame._height,
(byte *)frame._frame.getPixels());
}
}
} // End of namespace Sherlock
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