2 #data: matrix of double or connection
3 serialize = function(data, file, type, nb_per_chunk)
5 bin_data = file(file, "ab")
6 #write data length on first call
7 nbytes = ifelse(type=="double",8,4)
9 if (file.info(file)$size == 0)
11 #number of items always on 8 bytes
12 writeBin(0L, bin_data, size=8) #,endian="little")
17 writeBin(t(data), bin_data, size=nbytes)
18 data_length = ncol(data)
20 else #if (is(data, "connection"))
24 data_line = scan(data, double(), sep=",", nlines=1)
25 writeBin(data_line, bin_data, size=nbytes)
26 data_length = length(data_line)
30 data_chunk = scan(data, double(), sep=",", nlines=nb_per_chunk)
31 if (length(data_chunk)==0)
33 writeBin(data_chunk, bin_data, size=nbytes)
38 #ecrire file_size-1 / (nbytes*nbWritten) en 0 dans bin_data ! ignored == file_size
39 ignored = seek(bin_data, 0)
40 writeBin(data_length, bin_data, size=8)
45 #TODO: read in binary file, always same structure
46 getDataFromFile(indices, file, type)
48 bin_data = file(file, "rb")
49 nbytes = ifelse(type=="double",8,4)
50 data_length = readBin(bin_data,"double",1,nbytes) #,endian="little")
51 t(sapply(indices, function(i) readBin(bin_data,"double",n=data_length,size=nbytes)))