Add a GDS node with a file

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Description

Add a file to a GDS file as a node.

Usage

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addfile.gdsn(node, name, filename,
	compress=c("ZIP", "ZIP_RA", "LZ4", "LZ4_RA"), replace=FALSE)

Arguments

node

an object of class gdsn.class or gds.class

name

the variable name of the added node; if it is not specified, “Item N” is assigned to name, where N is the number of child nodes plus one

filename

the file name of input stream.

compress

the compression method can be "" (no compression), "ZIP", "ZIP.fast", "ZIP.default", "ZIP.max" or "ZIP.none" (original zlib); "ZIP_RA", "ZIP_RA.fast", "ZIP_RA.default", "ZIP_RA.max" or "ZIP_RA.none" (zlib with efficient random access); "LZ4", "LZ4.none", "LZ4.fast", "LZ4.hc" or "LZ4.max"; "LZ4_RA", "LZ4_RA.none", "LZ4_RA.fast", "LZ4_RA.hc" or "LZ4_RA.max" (with efficient random access). See details

replace

if TRUE, replace the existing variable silently if possible

Details

compress: Z compression algorithm (http://www.zlib.net/) can be used to deflate the data stored in the GDS file. "ZIP" option is equivalent to "ZIP.default". "ZIP.fast", "ZIP.default" and "ZIP.max" correspond to different compression levels.

To support efficient random access of Z stream, "ZIP_RA", "ZIP_RA.fast", "ZIP_RA.default", "ZIP_RA.max" or "ZIP_RA.none" should be specified. "ZIP_RA" option is equivalent to "ZIP_RA.default:256K". The block size can be specified by following colon, and "16K", "32K", "64K", "128K", "256K", "512K" and "1M" are allowed, such like "ZIP_RA:16K". The compression algorithm tries to keep each independent compressed data block to be about of the specified block size, such like 64K.

LZ4 fast lossless compression algorithm is allowed with compress="LZ4" (http://code.google.com/p/lz4/). Three compression levels can be specified, "LZ4.fast" (LZ4 fast mode), "LZ4.hc" (LZ4 high compression mode), "LZ4.max" (maximize the compression ratio). The block size can be specified by following colon, and "64K", "256K", "1M" and "4M" are allowed according to LZ4 frame format. "LZ4" is equivalent to "LZ4.hc:256K".

To support efficient random access of LZ4 stream, "LZ4_RA", "LZ4_RA.fast", "LZ4_RA.hc", "ZIP_RA.max" or "LZ4_RA.none" should be specified. "LZ4_RA" option is equivalent to "LZ4_RA.hc:256K". The block size can be specified by following colon, and "16K", "32K", "64K", "128K", "256K", "512K" and "1M" are allowed, such like "ZIP_RA:16K". The compression algorithm tries to keep each independent compressed data block to be about of the specified block size, such like 64K.

Value

An object of class gdsn.class.

Author(s)

Xiuwen Zheng

References

http://github.com/zhengxwen/gdsfmt

See Also

getfile.gdsn, add.gdsn

Examples

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# save a .RData object
obj <- list(X=1:10, Y=seq(1, 10, 0.1))
save(obj, file="tmp.RData")

# cteate a GDS file
f <- createfn.gds("test.gds")

add.gdsn(f, "double", val=seq(1, 1000, 0.4))
addfile.gdsn(f, "tmp.RData", "tmp.RData")

# open the GDS file
closefn.gds(f)


# open the existing file
(f <- openfn.gds("test.gds"))

getfile.gdsn(index.gdsn(f, "tmp.RData"), "tmp1.RData")
(obj <- get(load("tmp1.RData")))

# open the GDS file
closefn.gds(f)


# delete the temporary files
unlink(c("test.gds", "tmp.RData", "tmp1.RData"), force=TRUE)

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