C++ common::ReadStream类代码示例

static int readStream(void *context, char *buffer, int len) {
	Common::ReadStream *stream = static_cast<Common::ReadStream *>(context);
	if (!stream)
		return -1;

	return stream->read(buffer, 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 == getLureLanguage()) && (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();
}

bool SavePartVars::read(Common::ReadStream &stream) {
	if (!_header.verify(stream))
		return false;

	if (stream.read(_data, _size) != _size)
		return false;

	return !stream.err();
}

/**
 * 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;
}

/**
 * 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;
}

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);
}

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;
}

void SoundHandler::loadIntroSong(Common::ReadStream &in) {
	for (int varnt = 0; varnt < _vm->_numVariant; varnt++) {
		uint16 numBuf = in.readUint16BE();
		if (varnt == _vm->_gameVariant)
			_DOSIntroSong = _vm->_text->getTextData(numBuf);
	}
}

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);
	}
}

static void saveOrLoadCommonArray(Common::ReadStream &stream, A &array) {
	uint count = stream.readUint16LE();
	if (count == array.size()) {
		for (uint i = 0; i < count; ++i) {
			saveOrLoad(stream, array[i]);
		}
	}
}

void Design::drawOval(Graphics::ManagedSurface *surface, Common::ReadStream &in,
			Patterns &patterns, byte fillType, byte borderThickness, byte borderFillType) {
	int16 y1 = in.readSint16BE();
	int16 x1 = in.readSint16BE();
	int16 y2 = in.readSint16BE();
	int16 x2 = in.readSint16BE();
	PlotData pd(surface, &patterns, fillType, 1, this);

	if (fillType <= patterns.size())
		Graphics::drawEllipse(x1, y1, x2-1, y2-1, kColorBlack, true, drawPixel, &pd);

	pd.fillType = borderFillType;
	pd.thickness = borderThickness;

	if (borderThickness > 0 && borderFillType <= patterns.size())
		Graphics::drawEllipse(x1, y1, x2-1, y2-1, kColorBlack, false, drawPixel, &pd);
}

/**
 * Load _cmdList from Hugo.dat
 */
void Parser::loadCmdList(Common::ReadStream &in) {
	cmd tmpCmd;
	memset(&tmpCmd, 0, sizeof(tmpCmd));
	for (int varnt = 0; varnt < _vm->_numVariant; varnt++) {
		uint16 numElem = in.readUint16BE();
		if (varnt == _vm->_gameVariant) {
			_cmdListSize = numElem;
			_cmdList = (cmd **)malloc(sizeof(cmd *) * _cmdListSize);
		}

		for (int16 i = 0; i < numElem; i++) {
			uint16 numSubElem = in.readUint16BE();
			if (varnt == _vm->_gameVariant)
				_cmdList[i] = (cmd *)malloc(sizeof(cmd) * numSubElem);
			for (int16 j = 0; j < numSubElem; j++)
				readCmd(in, (varnt == _vm->_gameVariant) ? _cmdList[i][j] : tmpCmd);
		}
	}
}

/**
 * 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();
}