C++ PHYSFS_fileLength函数代码示例

int64 File::getSize()
{
	// If the file is closed, open it to
	// check the size.
	if (file == 0)
	{
		open(READ);
		int64 size = (int64)PHYSFS_fileLength(file);
		close();
		return size;
	}

	return (int64)PHYSFS_fileLength(file);
}

	unsigned int File::getSize()
	{
		// If the file is closed, open it to
		// check the size.
		if(file == 0)
		{
			open(READ);
			unsigned int size = (unsigned int)PHYSFS_fileLength(file);
			close();
			return size;
		}

		return (unsigned int)PHYSFS_fileLength(file);
	}

	int File::getSize()
	{
		// If the file is closed, open it to
		// check the size.
		if(file == 0)
		{
			if(!open())
				return 0;
			int size = (int)PHYSFS_fileLength(file);
			close();
			return size;
		}

		return (int)PHYSFS_fileLength(file);
	}

natU8* FileManager::Read(const natChar* _filename, size_t* _size)
{
//#if defined(WINDOWS_TARGET)
	PHYSFS_file* file = PHYSFS_openRead(_filename);
	assert(file);

	*_size = PHYSFS_fileLength(file);
	assert(*_size != 0);

	natU8* buffer = new natU8[*_size];
	PHYSFS_read(file, buffer, 1, static_cast<PHYSFS_uint32>(*_size));
	PHYSFS_close(file);

	return buffer;
/*#elif defined(EMSCRIPTEN_TARGET)
	std::ifstream file(_filename, std::ios::in|std::ios::binary|std::ios::ate);
	assert(file.is_open());

	*_size = file.tellg();
	assert(*_size != 0);

	natU8* buffer = new natU8[*_size];
	file.seekg (0, std::ios::beg);
	file.read ((char*)buffer, *_size);
	file.close();

	return buffer;
#else

#endif*/
}

IFileStreambuf::pos_type
IFileStreambuf::seekoff(off_type off, std::ios_base::seekdir dir,
                        std::ios_base::openmode mode)
{
  off_type pos = off;
  PHYSFS_sint64 ptell = PHYSFS_tell(file);

  switch(dir) {
    case std::ios_base::beg:
      break;
    case std::ios_base::cur:
      if(off == 0)
        return static_cast<pos_type> (ptell) - static_cast<pos_type> (egptr() - gptr());
      pos += static_cast<off_type> (ptell) - static_cast<off_type> (egptr() - gptr());
      break;
    case std::ios_base::end:
      pos += static_cast<off_type> (PHYSFS_fileLength(file));
      break;
    default:
      assert(false);
      return pos_type(off_type(-1));
  }

  return seekpos(static_cast<pos_type> (pos), mode);
}

static int l_filesystem_require(lua_State* state)
{
  if(!lua_isstring(state, 1))
    return luaL_error(state, "The argument must be a string.");

  const char* filename = lua_tostring(state, 1);

  char myBuf[2048] = {0};

  PHYSFS_file* myfile = PHYSFS_openRead(filename);
  if(!myfile)
    printf("%s %s \n", "No .lua file named in directory ", filename);
  PHYSFS_sint64 fileLngth = PHYSFS_fileLength(myfile);
  PHYSFS_read (myfile, myBuf, 1, fileLngth);
  int status = 0;

  status = luaL_loadbuffer(state, (const char *)myBuf, fileLngth, filename) || lua_pcall(state, 0,0,0);
  if(status != 0) luaL_error(state,lua_tostring(state,-1));

  PHYSFS_close(myfile);

  switch (status)
    {
    case LUA_ERRMEM:
      return luaL_error(state, "Memory allocation error: %s\n", lua_tostring(state, -1));
    case LUA_ERRSYNTAX:
      return luaL_error(state, "Syntax error: %s\n", lua_tostring(state, -1));
    default: // success
      return 1;
    }

  return 1;
}

int fs_seek(fs_file fh, long offset, int whence)
{
    PHYSFS_uint64 pos = 0;
    PHYSFS_sint64 cur = PHYSFS_tell(fh->handle);
    PHYSFS_sint64 len = PHYSFS_fileLength(fh->handle);

    switch (whence)
    {
    case SEEK_SET:
        pos = offset;
        break;

    case SEEK_CUR:
        if (cur < 0)
            return -1;
        pos = cur + offset;
        break;

    case SEEK_END:
        if (len < 0)
            return -1;
        pos = len + offset;
        break;
    }

    return PHYSFS_seek(fh->handle, pos);
}

void*
ResourceManager::loadFile(const std::string &fileName, int &fileSize)
{
    // Attempt to open the specified file using PhysicsFS
    PHYSFS_file *file = PHYSFS_openRead(fileName.c_str());

    // If the handler is an invalid pointer indicate failure
    if (file == NULL) {
        logger->log("Warning: Failed to load %s: %s",
                fileName.c_str(), PHYSFS_getLastError());
        return NULL;
    }

    // Log the real dir of the file
    logger->log("Loaded %s/%s", PHYSFS_getRealDir(fileName.c_str()),
            fileName.c_str());

    // Get the size of the file
    fileSize = PHYSFS_fileLength(file);

    // Allocate memory and load the file
    void *buffer = malloc(fileSize);
    PHYSFS_read(file, buffer, 1, fileSize);

    // Close the file and let the user deallocate the memory
    PHYSFS_close(file);

    return buffer;
}

int OSBasics::seek(OSFILE * stream, long int offset, int origin ) {
	switch(stream->fileType) {
		case OSFILE::TYPE_FILE:
			return fseek(stream->file, offset, origin);
			break;
		case OSFILE::TYPE_ARCHIVE_FILE:
			switch(origin) {
				case SEEK_SET:
					return PHYSFS_seek(stream->physFSFile, offset);
				break;
				case SEEK_CUR: {
					PHYSFS_sint64 curoffset = PHYSFS_tell(stream->physFSFile);					
					return PHYSFS_seek(stream->physFSFile, curoffset+offset);				
				}
				break;
				case SEEK_END: {
					PHYSFS_sint64 fileLength =  PHYSFS_fileLength(stream->physFSFile);
					return PHYSFS_seek(stream->physFSFile, fileLength-offset);
				}
				break;
			}
			break;			
	}
	return 0;	
}

// Read a whole file and put it in a new buffer
unsigned int j1FileSystem::Load(const char* file, char** buffer) const
{
	unsigned int ret = 0;

	PHYSFS_file* fs_file = PHYSFS_openRead(file);

	if(fs_file != NULL)
	{
		PHYSFS_sint32 size = PHYSFS_fileLength(fs_file);

		if(size > 0)
		{
			*buffer = new char[size];
			int readed = PHYSFS_read(fs_file, *buffer, 1, size);
			if(readed != size)
			{
				LOG("File System error while reading from file %s: %s\n", file, PHYSFS_getLastError());
				RELEASE(buffer);
			}
			else
				ret = readed;
		}

		if(PHYSFS_close(fs_file) == 0)
			LOG("File System error while closing file %s: %s\n", file, PHYSFS_getLastError());
	}
	else
		LOG("File System error while opening file %s: %s\n", file, PHYSFS_getLastError());

	return ret;
}

static Sint64 SDL_RWopsSeek(SDL_RWops *ops, int64_t offset, int whence)
{
	PHYSFS_File *f = sdlPHYS(ops);

	if (!f)
		return -1;

	int64_t base;

	switch (whence)
	{
	default:
	case RW_SEEK_SET :
		base = 0;
		break;
	case RW_SEEK_CUR :
		base = PHYSFS_tell(f);
		break;
	case RW_SEEK_END :
		base = PHYSFS_fileLength(f);
		break;
	}

	int result = PHYSFS_seek(f, base + offset);

	return (result != 0) ? PHYSFS_tell(f) : -1;
}

bool j1Physfs::OpenFile(const char* file)
{
	if (0 == PHYSFS_exists(file))
	{
		return false; //file doesn't exist
	}

	PHYSFS_file* myfile = PHYSFS_openRead(file);

	// Get the lenght of the file
	file_lenght = PHYSFS_fileLength(myfile);

	// Get the file data.
	file_data = new Uint32[file_lenght];

	int length_read = PHYSFS_read(myfile, file_data, 1, file_lenght);

	if (length_read != (int)file_lenght)
	{
		delete[] file_data;
		file_data = 0;
		return false;
	}

	PHYSFS_close(myfile);


	return true;
}

	bool FileManager::loadFile(const std::string & path, std::vector<u8>& out)
	{
		auto file = PHYSFS_openRead(path.c_str());

		if (file == nullptr)
		{
			Log::write(Log::Error, fmt::format("Error: Unable to open file for reading. {}", path));
			return false;
		}

		auto length = PHYSFS_fileLength(file);

		if (length == -1)
		{
			Log::write(Log::Error, fmt::format("Error: Unable to get file length. {}", path));
			return false;
		}

		out.resize(length + 1);
		auto num = PHYSFS_read(file, out.data(), sizeof(out[0]), length);

		if (num < length / sizeof(out[0]))
		{
			Log::write(Log::Error, fmt::format("Error: Unable to read file contents. {}", path));
			return false;
		}

		return true;
	}

static QImage loadQImage(char const *fileName, char const *format = nullptr)
{
	PHYSFS_file *fileHandle = PHYSFS_openRead(fileName);
	if (fileHandle == nullptr)
	{
		return {};
	}
	int64_t fileSizeGuess = PHYSFS_fileLength(fileHandle);  // PHYSFS_fileLength may return -1.
	int64_t lengthRead = 0;
	std::vector<unsigned char> data(fileSizeGuess != -1? fileSizeGuess : 16384);
	while (true)
	{
		int64_t moreRead = PHYSFS_read(fileHandle, &data[lengthRead], 1, data.size() - lengthRead);
		lengthRead += std::max<int64_t>(moreRead, 0);
		if (lengthRead < data.size())
		{
			PHYSFS_close(fileHandle);
			data.resize(lengthRead);
			QImage image;
			image.loadFromData(&data[0], data.size(), format);
			return std::move(image);
		}
		data.resize(data.size() + 16384);
	}
}

const char* kp::file::read(const char* filename)
{
    PHYSFS_File* handle = PHYSFS_openRead(filename);

    if(handle == NULL)
    {
        //kp::debug::error("PHYSFS_openRead(%s): %s", filename, PHYSFS_getLastError());
        
        return NULL;
    }

    // Create a buffer big enough for the file
    PHYSFS_sint64 size = PHYSFS_fileLength(handle);

    // Append an extra byte to the string so we can null terminate it
    char* buffer = new char[size+1];

    // Read the bytes
    if(PHYSFS_readBytes(handle, buffer, size) != size)
    {
        //kp::debug::error("PHYSFS_read: %s", PHYSFS_getLastError());
        
        return NULL;
    }

    // Null terminate the buffer
    buffer[size] = '\0';

    // Close the file handle
    PHYSFS_close(handle);

    return buffer;
}