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));
}
}
bool SavePartVars::read(Common::ReadStream &stream) {
if (!_header.verify(stream))
return false;
if (stream.read(_data, _size) != _size)
return false;
return !stream.err();
}
bool SaveContainer::read(Common::ReadStream &stream) {
// Verify the header and get the container's size
if (!_header.verifyReadSize(stream))
return false;
// The part count has to be correct
if (stream.readUint32LE() != _partCount)
return false;
// Iterate over all parts
for (PartIterator it = _parts.begin(); it != _parts.end(); ++it) {
// Read the size
uint32 size = stream.readUint32LE();
if (stream.err()) {
clear();
return false;
}
Part *&p = *it;
delete p;
// Create a suitable part
p = new Part(size);
}
// Update size
_header.setSize(calcSize());
// Iterate over all parts
for (PartIterator it = _parts.begin(); it != _parts.end(); ++it) {
Part *&p = *it;
// Read the part
if (stream.read(p->data, p->size) != p->size) {
clear();
return false;
}
}
return !stream.err();
}
bool SaveHeader::read(Common::ReadStream &stream) {
// Read the header and verify the global IDs
if (stream.readUint32BE() != kID1)
return false;
if (stream.readUint32BE() != kID2)
return false;
_type = stream.readUint32BE();
_version = stream.readUint32LE();
_size = stream.readUint32LE();
return !stream.err();
}
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);
}
bool SaveHeader::verify(Common::ReadStream &stream) const {
// Compare the header with the stream's content
if (stream.readUint32BE() != kID1)
return false;
if (stream.readUint32BE() != kID2)
return false;
if (stream.readUint32BE() != _type)
return false;
if (stream.readUint32LE() != _version)
return false;
if (stream.readUint32LE() != _size)
return false;
return !stream.err();
}
bool SaveHeader::verifyReadSize(Common::ReadStream &stream) {
// Compare the header with the stream's content, expect for the size
if (stream.readUint32BE() != kID1)
return false;
if (stream.readUint32BE() != kID2)
return false;
if (stream.readUint32BE() != _type)
return false;
if (stream.readUint32LE() != _version)
return false;
// Read the size out of the stream instead
_size = stream.readUint32LE();
return !stream.err();
}
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();
}
void Display::loadFrameBuffer(Common::ReadStream &stream) {
byte *dst = _frameBuf;
for (uint j = 0; j < 8; ++j) {
for (uint i = 0; i < 8; ++i) {
stream.read(dst, DISPLAY_PITCH);
dst += DISPLAY_PITCH * 64;
stream.read(dst, DISPLAY_PITCH);
dst += DISPLAY_PITCH * 64;
stream.read(dst, DISPLAY_PITCH);
stream.readUint32LE();
stream.readUint32LE();
dst -= DISPLAY_PITCH * 120;
}
dst -= DISPLAY_PITCH * 63;
}
if (stream.eos() || stream.err())
error("Failed to read frame buffer");
}
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);
}
}
