void HiRes5Engine::loadSong(Common::ReadStream &stream) {
while (true) {
const byte period = stream.readByte();
if (stream.err() || stream.eos())
error("Error loading song");
if (period == 0xff)
return;
byte length = stream.readByte();
if (stream.err() || stream.eos())
error("Error loading song");
const uint kLoopCycles = 20; // Delay loop cycles
double freq = 0.0;
// This computation ignores CPU cycles spent on overflow handling and
// speaker control. As a result, our tone frequencies will be slightly
// higher than those on original hardware.
if (period != 0)
freq = kClock / 2.0 / (period * kLoopCycles);
const double len = (length > 0 ? length - 1 : 255) * 256 * kLoopCycles * 1000 / (double)kClock;
_song.push_back(Tone(freq, len));
}
}
Common::String *LureEngine::detectSave(int slotNumber) {
Common::ReadStream *f = this->_saveFileMan->openForLoading(
generateSaveName(slotNumber));
if (f == NULL) return NULL;
Common::String *result = NULL;
// Check for header
char buffer[5];
f->read(&buffer[0], 5);
if (memcmp(&buffer[0], "lure", 5) == 0) {
// Check language version
uint8 language = f->readByte();
uint8 version = f->readByte();
if ((language == getLanguage()) && (version >= LURE_MIN_SAVEGAME_MINOR)) {
// Read in the savegame title
char saveName[MAX_DESC_SIZE];
char *p = saveName;
int decCtr = MAX_DESC_SIZE - 1;
while ((decCtr > 0) && ((*p++ = f->readByte()) != 0)) --decCtr;
*p = '\0';
result = new Common::String(saveName);
}
}
delete f;
return result;
}
void Parser::readBG(Common::ReadStream &in, Background &curBG) {
curBG._verbIndex = in.readUint16BE();
curBG._nounIndex = in.readUint16BE();
curBG._commentIndex = in.readSint16BE();
curBG._matchFl = (in.readByte() != 0);
curBG._roomState = in.readByte();
curBG._bonusIndex = in.readByte();
}
void Parser::readBG(Common::ReadStream &in, background_t &curBG) {
curBG.verbIndex = in.readUint16BE();
curBG.nounIndex = in.readUint16BE();
curBG.commentIndex = in.readSint16BE();
curBG.matchFl = (in.readByte() != 0);
curBG.roomState = in.readByte();
curBG.bonusIndex = in.readByte();
}
void Voice8Header::load(Common::ReadStream &stream) {
oneShotHiSamples = stream.readUint32BE();
repeatHiSamples = stream.readUint32BE();
samplesPerHiCycle = stream.readUint32BE();
samplesPerSec = stream.readUint16BE();
octaves = stream.readByte();
compression = stream.readByte();
volume = stream.readUint32BE();
}
/**
* Extracts a string from a data stream
* @param df data stream
*/
Common::String readString(Common::ReadStream &df) {
Common::String var;
uint8 len = df.readByte();
for (int i = 0; i < len; i++) {
char c;
c = df.readByte();
var += c;
}
return var;
}
DataBlockPtr AdlEngine_v2::readDataBlockPtr(Common::ReadStream &f) const {
byte track = f.readByte();
byte sector = f.readByte();
byte offset = f.readByte();
byte size = f.readByte();
if (f.eos() || f.err())
error("Error reading DataBlockPtr");
if (track == 0 && sector == 0 && offset == 0 && size == 0)
return DataBlockPtr();
return _disk->getDataBlock(track, sector, offset, size);
}
static void deDPCM8Stereo(int16 *out, Common::ReadStream &audioStream, uint32 numBytes, uint8 &sampleL, uint8 &sampleR) {
for (uint32 i = 0; i < numBytes; ++i) {
const uint8 delta = audioStream.readByte();
deDPCM8Nibble(out++, sampleL, delta >> 4);
deDPCM8Nibble(out++, sampleR, delta & 0xf);
}
}
/**
* Read a cmd structure from Hugo.dat
*/
void Parser::readCmd(Common::ReadStream &in, cmd &curCmd) {
curCmd.verbIndex = in.readUint16BE();
curCmd.reqIndex = in.readUint16BE();
curCmd.textDataNoCarryIndex = in.readUint16BE();
curCmd.reqState = in.readByte();
curCmd.newState = in.readByte();
curCmd.textDataWrongIndex = in.readUint16BE();
curCmd.textDataDoneIndex = in.readUint16BE();
curCmd.actIndex = in.readUint16BE();
}
/**
* Load a NULL-terminated string from the given stream.
*/
static Common::String loadString(Common::ReadStream &in, uint maxSize = 999) {
Common::String result;
while (!in.eos() && (result.size() < maxSize)) {
char ch = (char)in.readByte();
if (ch == '\0')
break;
result += ch;
}
return result;
}
bool LureEngine::loadGame(uint8 slotNumber) {
Common::ReadStream *f = this->_saveFileMan->openForLoading(
generateSaveName(slotNumber));
if (f == NULL)
return false;
// Check for header
char buffer[5];
f->read(buffer, 5);
if (memcmp(buffer, "lure", 5) != 0) {
warning(FAILED_MSG, slotNumber);
delete f;
return false;
}
// Check language version
uint8 language = f->readByte();
_saveVersion = f->readByte();
if ((language != getLureLanguage()) || (_saveVersion < LURE_MIN_SAVEGAME_MINOR)) {
warning("loadGame: Failed to load slot %d - incorrect version", slotNumber);
delete f;
return false;
}
// Read in and discard the savegame caption
while (f->readByte() != 0)
;
// Load in the data
Resources::getReference().loadFromStream(f);
Game::getReference().loadFromStream(f);
Sound.loadFromStream(f);
Fights.loadFromStream(f);
Room::getReference().loadFromStream(f);
delete f;
return true;
}
Common::String XARCMember::readString(Common::ReadStream &stream) {
Common::String str;
// Read until we find a 0
char c = 1;
while (c != 0) {
c = stream.readByte();
if (stream.eos()) {
c = 0;
} else {
str += c;
}
}
return str;
}
bool SavePartSprite::read(Common::ReadStream &stream) {
SaveHeader header;
header.read(stream);
if (_header != header) {
if (!_trueColor) {
// Header validation failed, trying again with the old version
_header.setVersion(1);
_header.setSize(_header.getSize() - 1);
if (_header != header)
// Nope, isn't it either
return false;
_oldFormat = true;
_header.setVersion(kVersion);
_header.setSize(_header.getSize() + 1);
} else
return false;
}
// The sprite's dimensions have to fit
if (stream.readUint32LE() != _width)
return false;
if (stream.readUint32LE() != _height)
return false;
// If it's in the current format, the true color flag has to be the same too
if (!_oldFormat)
if ((stream.readByte() != 0) != _trueColor)
return false;
// Sprite data
if (stream.read(_dataSprite, _spriteSize) != _spriteSize)
return false;
// Palette data
if (stream.read(_dataPalette, 768) != 768)
return false;
return !stream.err();
}
bool SavePartInfo::read(Common::ReadStream &stream) {
if (!_header.verify(stream))
return false;
if (stream.readUint32LE() != _gameID)
return false;
if (stream.readUint32LE() != _gameVersion)
return false;
if (stream.readByte() != _endian)
return false;
if (stream.readUint32LE() != _varCount)
return false;
if (stream.readUint32LE() != _descMaxLength)
return false;
if (stream.read(_desc, _descMaxLength) != _descMaxLength)
return false;
_desc[_descMaxLength] = 0;
return !stream.err();
}
void Graphics_v1::drawCorners(Common::ReadStream &corners, const Common::Point &pos, byte rotation, byte scaling, byte color) const {
const byte stepping[] = {
0xff, 0xfe, 0xfa, 0xf4, 0xec, 0xe1, 0xd4, 0xc5,
0xb4, 0xa1, 0x8d, 0x78, 0x61, 0x49, 0x31, 0x18,
0xff
};
byte quadrant = rotation >> 4;
rotation &= 0xf;
byte xStep = stepping[rotation];
byte yStep = stepping[(rotation ^ 0xf) + 1] + 1;
Common::Point p(pos);
while (true) {
byte b = corners.readByte();
if (corners.eos() || corners.err())
error("Error reading corners");
if (b == 0)
return;
do {
byte xFrac = 0x80;
byte yFrac = 0x80;
for (uint j = 0; j < scaling; ++j) {
if (xFrac + xStep + 1 > 255)
drawCornerPixel(p, color, b, quadrant);
xFrac += xStep + 1;
if (yFrac + yStep > 255)
drawCornerPixel(p, color, b, quadrant + 1);
yFrac += yStep;
}
b >>= 3;
} while (b != 0);
}
}
