C++ File::read方法代码示例

void AGOSEngine_PN::loadGamePcFile() {
	if (getFileName(GAME_BASEFILE) != NULL) {
		Common::File in;
		// Read dataBase
		if (!in.open(getFileName(GAME_BASEFILE))) {
			error("loadGamePcFile: Can't load database file '%s'", getFileName(GAME_BASEFILE));
		}

		_dataBaseSize = in.size();
		_dataBase = (byte *)malloc(_dataBaseSize);
		if (_dataBase == NULL)
			error("loadGamePcFile: Out of memory for dataBase");
		in.read(_dataBase, _dataBaseSize);

		if (_dataBase[31] != 0)
			error("Later version of system requested");
	}

	if (getFileName(GAME_TEXTFILE) != NULL) {
		Common::File in;
		// Read textBase
		if (!in.open(getFileName(GAME_TEXTFILE))) {
			error("loadGamePcFile: Can't load textbase file '%s'", getFileName(GAME_TEXTFILE));
		}

		_textBaseSize = in.size();
		_textBase = (byte *)malloc(_textBaseSize);
		if (_textBase == NULL)
			error("loadGamePcFile: Out of memory for textBase");
		in.read(_textBase, _textBaseSize);

		if (_textBase[getlong(30L)] != 128)
			error("Unknown compression format");
	}
}

bool TeenAgentEngine::showCDLogo() {
	Common::File cdlogo;
	if (!cdlogo.exists("cdlogo.res") || !cdlogo.open("cdlogo.res"))
		return true;

	byte bg[0xfa00];
	byte palette[3*256];

	cdlogo.read(bg, sizeof(bg));
	cdlogo.read(palette, sizeof(palette));
	for (uint c = 0; c < 3*256; ++c)
		palette[c] *= 4;
	_system->getPaletteManager()->setPalette(palette, 0, 0x100);
	_system->copyRectToScreen(bg, 320, 0, 0, 320, 200);
	_system->updateScreen();

	for(uint i = 0; i < 20; ++i) {
		int r = skipEvents();
		if (r != 0)
			return r > 0? true: false;
		_system->delayMillis(100);
	}
	cdlogo.close();

	return true;
}

/**
 * This function does noting but load a raw resource into memory,
 * if further decoding is required, it must be done by another
 * routine. NULL is returned if unsucsessfull.
 */
uint8 *AgiLoader_v2::loadVolRes(struct AgiDir *agid) {
	uint8 *data = NULL;
	char x[MAXPATHLEN], *path;
	Common::File fp;
	unsigned int sig;

	sprintf(x, "vol.%i", agid->volume);
	path = x;
	debugC(3, kDebugLevelResources, "Vol res: path = %s", path);

	if (agid->offset != _EMPTY && fp.open(path)) {
		debugC(3, kDebugLevelResources, "loading resource at offset %d", agid->offset);
		fp.seek(agid->offset, SEEK_SET);
		fp.read(&x, 5);
		if ((sig = READ_BE_UINT16((uint8 *) x)) == 0x1234) {
			agid->len = READ_LE_UINT16((uint8 *) x + 3);
			data = (uint8 *) calloc(1, agid->len + 32);
			if (data != NULL) {
				fp.read(data, agid->len);
			} else {
				exit(1);
			}
		} else {
			warning("AgiLoader_v2::loadVolRes: bad signature %04x", sig);
			return 0;
		}
		fp.close();
	} else {
		// we have a bad volume resource
		// set that resource to NA
		agid->offset = _EMPTY;
	}

	return data;
}

 // FIXME/TODO: 아래는 코드 중복 모음
 void loadEmergencyFont()
 {
     Common::File fp;
     int numChar = 0;
     
     numChar = 2350;
     if (fp.open("korean.fnt")) {
         fp.seek(2, SEEK_CUR);
         _korFontWidth = fp.readByte();
         _korFontHeight = fp.readByte();
         _korFontPtr = new byte[((_korFontWidth + 7) / 8) * _korFontHeight * numChar];
         
         fp.read(_korFontPtr, ((_korFontWidth + 7) / 8) * _korFontHeight * numChar);
         fp.close();
         warning("V1 한글 폰트가 로드되었습니다.\n");
     } else {
         warning("V1 한글 폰트를 로드할 수 없습니다!\n");
     }
     
     numChar = 256;
     if (fp.open("english.fnt")) {
         fp.seek(2, SEEK_CUR);
         _engFontWidth = fp.readByte();
         _engFontHeight = fp.readByte();
         _engFontPtr = new byte[((_engFontWidth + 7) / 8) * _engFontHeight * numChar];
         
         fp.read(_engFontPtr, ((_engFontWidth + 7) / 8) * _engFontHeight * numChar);
         fp.close();
         warning("V1 영문 폰트가 로드되었습니다.\n");
     } else {
         warning("V1 영문 폰트를 로드할 수 없습니다!\n");
     }
 }

void AGOSEngine::decompressData(const char *srcName, byte *dst, uint32 offset, uint32 srcSize, uint32 dstSize) {
#ifdef USE_ZLIB
		Common::File in;
		in.open(srcName);
		if (in.isOpen() == false)
			error("decompressData: Can't load %s", srcName);

		in.seek(offset, SEEK_SET);
		if (srcSize != dstSize) {
			byte *srcBuffer = (byte *)malloc(srcSize);

			if (in.read(srcBuffer, srcSize) != srcSize)
				error("decompressData: Read failed");

			unsigned long decompressedSize = dstSize;
			if (!Common::uncompress(dst, &decompressedSize, srcBuffer, srcSize))
				error("decompressData: Zlib uncompress error");
			free(srcBuffer);
		} else {
			if (in.read(dst, dstSize) != dstSize)
				error("decompressData: Read failed");
		}
		in.close();
#else
	error("Zlib support is required for Amiga and Macintosh versions");
#endif
}

/**
 * Loads the contents of the mort.dat data file
 */
Common::ErrorCode MortevielleEngine::loadMortDat() {
	Common::File f;

	// Open the mort.dat file
	if (!f.open(MORT_DAT)) {
		Common::String msg = Common::String::format(_("Unable to locate the '%s' engine data file."), MORT_DAT);
		GUIErrorMessage(msg);
		return Common::kReadingFailed;
	}

	// Validate the data file header
	char fileId[4];
	f.read(fileId, 4);
	if (strncmp(fileId, "MORT", 4) != 0) {
		Common::String msg = Common::String::format(_("The '%s' engine data file is corrupt."), MORT_DAT);
		GUIErrorMessage(msg);
		return Common::kReadingFailed;
	}

	// Check the version
	int majVer = f.readByte();
	int minVer = f.readByte();

	if (majVer < MORT_DAT_REQUIRED_VERSION) {
		Common::String msg = Common::String::format(
			_("Incorrect version of the '%s' engine data file found. Expected %d.%d but got %d.%d."),
			MORT_DAT, MORT_DAT_REQUIRED_VERSION, 0, majVer, minVer);
		GUIErrorMessage(msg);
		return Common::kReadingFailed;
	}

	// Loop to load resources from the data file
	while (f.pos() < f.size()) {
		// Get the Id and size of the next resource
		char dataType[4];
		int dataSize;
		f.read(dataType, 4);
		dataSize = f.readUint16LE();

		if (!strncmp(dataType, "FONT", 4)) {
			// Font resource
			_screenSurface->readFontData(f, dataSize);
		} else if (!strncmp(dataType, "SSTR", 4)) {
			readStaticStrings(f, dataSize, kStaticStrings);
		} else if ((!strncmp(dataType, "GSTR", 4)) && (!_txxFileFl)) {
			readStaticStrings(f, dataSize, kGameStrings);
		} else if (!strncmp(dataType, "VERB", 4)) {
			_menu->readVerbNums(f, dataSize);
		} else {
			// Unknown section
			f.skip(dataSize);
		}
	}

	// Close the file
	f.close();

	assert(_engineStrings.size() > 0);
	return Common::kNoError;
}

bool TeenAgentEngine::showCDLogo() {
	Common::File cdlogo;
	if (!cdlogo.exists("cdlogo.res") || !cdlogo.open("cdlogo.res"))
		return true;

	byte bg[0xfa00];
	byte palette[0x400];

	cdlogo.read(bg, sizeof(bg));
	memset(palette, 0, sizeof(palette));

	for(uint c = 0; c < 0x100; ++c) {
		uint idx = c * 4;
		cdlogo.read(palette + idx, 3);
		palette[idx] *= 4;
		palette[idx + 1] *= 4;
		palette[idx + 2] *= 4;
	}
	_system->setPalette(palette, 0, 0x100);
	_system->copyRectToScreen(bg, 320, 0, 0, 320, 200);
	_system->updateScreen();

	for(uint i = 0; i < 20; ++i) {
		int r = skipEvents();
		if (r != 0)
			return r > 0? true: false;
		_system->delayMillis(100);
	}
	cdlogo.close();

	return true;
}

Common::SeekableReadStream *MADSResourceManager::loadResource(const char *resourceName, bool loadFlag) {
	Common::File hagFile;
	uint32 offset = 0, size = 0;

	// If the first character is a '@' then look for an external file

	if (*resourceName == '@') {
		++resourceName;

		hagFile.open(resourceName);
		if (loadFlag)
			return hagFile.readStream(hagFile.size());
		else
			return new Common::SeekableSubReadStream(&hagFile, 0, hagFile.size());
	}

	// If the first character is the wildcard (resource indicator), skip over it
	if (*resourceName == '*')
		++resourceName;

	char resName[20];
	strcpy(resName, resourceName);
	str_upper(resName);

	hagFile.open(getResourceFilename(resName));

	// Validate hag file header
	char headerBuffer[16];
	if ((hagFile.read(headerBuffer, 16) != 16) || (strncmp(headerBuffer, madsConcatString, 10) != 0))
		error("Invalid HAG file opened");

	int numEntries = hagFile.readUint16LE();

	int resIndex = -1;
	while (++resIndex < numEntries) {
		// Read in the details of the next resource
		char resourceBuffer[14];
		offset = hagFile.readUint32LE();
		size = hagFile.readUint32LE();
		hagFile.read(resourceBuffer, 14);

		if (!strcmp(resName, resourceBuffer))
			break;
	}

	if (resIndex == numEntries)
		error("Invalid resource '%s' specified", resourceName);

	// Get the resource, either loading it in it's entirely or getting a stream reference

	if (loadFlag) {
		hagFile.seek(offset);
		return hagFile.readStream(size);
	} else {
		return new Common::SeekableSubReadStream(&hagFile, offset, offset + size);
	}
}

/**
 * Loads the contents of the mort.dat data file
 */
Common::ErrorCode MortevielleEngine::loadMortDat() {
	Common::File f;

	// Open the mort.dat file
	if (!f.open(MORT_DAT)) {
		GUIErrorMessage("Could not locate 'mort.dat'.");
		return Common::kReadingFailed;
	}

	// Validate the data file header
	char fileId[4];
	f.read(fileId, 4);
	if (strncmp(fileId, "MORT", 4) != 0) {
		GUIErrorMessage("The located mort.dat data file is invalid");
		return Common::kReadingFailed;
	}

	// Check the version
	if (f.readByte() < MORT_DAT_REQUIRED_VERSION) {
		GUIErrorMessage("The located mort.dat data file is too old, please download an updated version on scummvm.org");
		return Common::kReadingFailed;
	}
	f.readByte();		// Minor version

	// Loop to load resources from the data file
	while (f.pos() < f.size()) {
		// Get the Id and size of the next resource
		char dataType[4];
		int dataSize;
		f.read(dataType, 4);
		dataSize = f.readUint16LE();

		if (!strncmp(dataType, "FONT", 4)) {
			// Font resource
			_screenSurface.readFontData(f, dataSize);
		} else if (!strncmp(dataType, "SSTR", 4)) {
			readStaticStrings(f, dataSize, kStaticStrings);
		} else if ((!strncmp(dataType, "GSTR", 4)) && (!_txxFileFl)) {
			readStaticStrings(f, dataSize, kGameStrings);
		} else if (!strncmp(dataType, "VERB", 4)) {
			_menu.readVerbNums(f, dataSize);
		} else {
			// Unknown section
			f.skip(dataSize);
		}
	}

	// Close the file
	f.close();

	assert(_engineStrings.size() > 0);
	return Common::kNoError;
}

//Gets AGIPAL Data
void GfxMgr::setAGIPal(int p0) {
	//If 0 from savefile, do not use
	if (p0 == 0)
		return;

	char filename[15];
	sprintf(filename, "pal.%d", p0);

	Common::File agipal;
	if (!agipal.open(filename)) {
		warning("Couldn't open AGIPAL palette file '%s'. Not changing palette", filename);
		return; // Needed at least by Naturette 3 which uses AGIPAL but provides no palette files
	}

	//Chunk0 holds colors 0-7
	agipal.read(&_agipalPalette[0], 24);

	//Chunk1 is the same as the chunk0

	//Chunk2 chunk holds colors 8-15
	agipal.seek(24, SEEK_CUR);
	agipal.read(&_agipalPalette[24], 24);

	//Chunk3 is the same as the chunk2

	//Chunks4-7 are duplicates of chunks0-3

	if (agipal.eos() || agipal.err()) {
		warning("Couldn't read AGIPAL palette from '%s'. Not changing palette", filename);
		return;
	}

	// Use only the lowest 6 bits of each color component (Red, Green and Blue)
	// because VGA used only 6 bits per color component (i.e. VGA had 18-bit colors).
	// This should now be identical to the original AGIPAL-hack's behavior.
	bool validVgaPalette = true;
	for (int i = 0; i < 16 * 3; i++) {
		if (_agipalPalette[i] >= (1 << 6)) {
			_agipalPalette[i] &= 0x3F; // Leave only the lowest 6 bits of each color component
			validVgaPalette = false;
		}
	}

	if (!validVgaPalette)
		warning("Invalid AGIPAL palette (Over 6 bits per color component) in '%s'. Using only the lowest 6 bits per color component", filename);

	_agipalFileNum = p0;

	initPalette(_agipalPalette);
	gfxSetPalette();

	debug(1, "Using AGIPAL palette from '%s'", filename);
}

/**
 * Speech function - Load Noise file
 * @remarks	Originally called 'charge_bruit'
 */
void SpeechManager::loadNoise() {
	Common::File f;

	if (!f.open("bruits"))               //Translation: "noise"
		error("Missing file - bruits");

	f.read(&_vm->_mem[kAdrNoise * 16], 250 * 128); // 32000
	for (int i = 0; i < _noise5Size; ++i)
		_vm->_mem[(kAdrNoise * 16) + 32000 + i] = _noise5Buf[i];
	f.read(&_vm->_mem[(kAdrNoise1 * 16) + kOffsetB1], 149 * 128); // 19072

	f.close();
}

/**
 * Reads boot file for program environment.  Fatal error if not there or
 * file checksum is bad.  De-crypts structure while checking checksum
 */
void FileManager::readBootFile() {
	debugC(1, kDebugFile, "readBootFile()");

	Common::File ofp;
	if (!ofp.open(getBootFilename())) {
		if (_vm->_gameVariant == kGameVariantH1Dos) {
			//TODO initialize properly _boot structure
			warning("readBootFile - Skipping as H1 Dos may be a freeware");
			memset(_vm->_boot._distrib, '\0', sizeof(_vm->_boot._distrib));
			_vm->_boot._registered = kRegFreeware;
			return;
		} else if (_vm->getPlatform() == Common::kPlatformPC) {
			warning("readBootFile - Skipping as H2 and H3 Dos may be shareware");
			memset(_vm->_boot._distrib, '\0', sizeof(_vm->_boot._distrib));
			_vm->_boot._registered = kRegShareware;
			return;
		} else {
			Utils::notifyBox(Common::String::format("Missing startup file '%s'", getBootFilename()));
			_vm->getGameStatus()._doQuitFl = true;
			return;
		}
	}

	if (ofp.size() < (int32)sizeof(_vm->_boot)) {
		Utils::notifyBox(Common::String::format("Corrupted startup file '%s'", getBootFilename()));
		_vm->getGameStatus()._doQuitFl = true;
		return;
	}

	_vm->_boot._checksum = ofp.readByte();
	_vm->_boot._registered = ofp.readByte();
	ofp.read(_vm->_boot._pbswitch, sizeof(_vm->_boot._pbswitch));
	ofp.read(_vm->_boot._distrib, sizeof(_vm->_boot._distrib));
	_vm->_boot._exitLen = ofp.readUint16LE();

	byte *p = (byte *)&_vm->_boot;

	byte checksum = 0;
	for (uint32 i = 0; i < sizeof(_vm->_boot); i++) {
		checksum ^= p[i];
		p[i] ^= s_bootCypher[i % s_bootCypherLen];
	}
	ofp.close();

	if (checksum) {
		Utils::notifyBox(Common::String::format("Corrupted startup file '%s'", getBootFilename()));
		_vm->getGameStatus()._doQuitFl = true;
	}
}

byte *Sword2Engine::fetchPsxBackground(uint32 location) {
	Common::File file;
	PSXScreensEntry header;
	uint32 screenOffset, dataOffset;
	uint32 totSize; // Total size of background, counting data, offset table and additional header
	byte *buffer;

	if (!file.open("screens.clu")) {
		GUIErrorMessage("Broken Sword 2: Cannot open screens.clu");
		return NULL;
	}

	file.seek(location * 4, SEEK_SET);
	screenOffset = file.readUint32LE();

	if (screenOffset == 0) { // We don't have screen data for this location number.
		file.close();
		return NULL;
	}

	// Get to the beginning of PSXScreensEntry
	file.seek(screenOffset + ResHeader::size(), SEEK_SET);

	buffer = (byte *)malloc(PSXScreensEntry::size());
	file.read(buffer, PSXScreensEntry::size());

	// Prepare the header
	header.read(buffer);
	free(buffer);

	file.seek(screenOffset + header.bgOffset + 4, SEEK_SET);
	dataOffset = file.readUint32LE();

	file.seek(screenOffset + header.bgOffset, SEEK_SET);

	totSize = header.bgSize + (dataOffset - header.bgOffset) + 8;
	buffer = (byte *)malloc(totSize);

	// Write some informations before background data
	WRITE_LE_UINT16(buffer, header.bgXres);
	WRITE_LE_UINT16(buffer + 2, header.bgYres);
	WRITE_LE_UINT32(buffer + 4, header.bgOffset);

	file.read(buffer + 8, totSize - 8); // Do not write on the header
	file.close();

	return buffer;
}

int AgiEngine::loadWords(const char *fname) {
	Common::File fp;
	uint32 flen;
	uint8 *mem = NULL;

	words = NULL;

	if (!fp.open(fname)) {
		warning("loadWords: can't open %s", fname);
		return errOK; // err_BadFileOpen
	}
	debug(0, "Loading dictionary: %s", fname);

	fp.seek(0, SEEK_END);
	flen = fp.pos();
	wordsFlen = flen;
	fp.seek(0, SEEK_SET);

	if ((mem = (uint8 *)calloc(1, flen + 32)) == NULL) {
		fp.close();
		return errNotEnoughMemory;
	}

	fp.read(mem, flen);
	fp.close();

	words = mem;

	return errOK;
}

/**
 * Read the encrypted text from the boot file and print it
 */
void FileManager::printBootText() {
	debugC(1, kDebugFile, "printBootText()");

	Common::File ofp;
	if (!ofp.open(getBootFilename())) {
		if (_vm->_gameVariant == kGameVariantH1Dos) {
			//TODO initialize properly _boot structure
			warning("printBootText - Skipping as H1 Dos may be a freeware");
			return;
		} else {
			error("Missing startup file '%s'", getBootFilename());
		}
	}

	// Allocate space for the text and print it
	char *buf = (char *)malloc(_vm->_boot.exit_len + 1);
	if (buf) {
		// Skip over the boot structure (already read) and read exit text
		ofp.seek((long)sizeof(_vm->_boot), SEEK_SET);
		if (ofp.read(buf, _vm->_boot.exit_len) != (size_t)_vm->_boot.exit_len)
			error("Error while reading startup file");

		// Decrypt the exit text, using CRYPT substring
		int i;
		for (i = 0; i < _vm->_boot.exit_len; i++)
			buf[i] ^= s_bootCyper[i % s_bootCyperLen];

		buf[i] = '\0';
		Utils::notifyBox(buf);
	}

	free(buf);
	ofp.close();
}