Nothing
find_compress <- function(f) {
if (grepl("\\.zip$", f)) {
return(list(file = sub("\\.zip$", "", f), compress = "zip"))
}
if (grepl("\\.tar\\.gz$", f)) {
return(list(file = sub("\\.tar\\.gz$", "", f), compress = "tar.gz"))
}
if (grepl(".tgz$", f)) {
return(list(file = sub("\\.tgz$", "", f), compress = "tar.gz"))
}
if (grepl("\\.tar\\.bz2$", f)) {
return(list(file = sub("\\.tar\\.bz2$", "", f), compress = "tar.bz2"))
}
if (grepl("\\.tbz2$", f)) {
return(list(file = sub("\\.tbz2$", "", f), compress = "tar.bz2"))
}
if (grepl("\\.tar$", f)) {
return(list(file = sub("\\.tar$", "", f), compress = "tar"))
}
if (grepl("\\.gzip$", f)) {
## weird
return(list(file = sub("\\.gzip$", "", f), compress = "gzip"))
}
if (grepl("\\.gz$", f)) {
return(list(file = sub("\\.gz$", "", f), compress = "gzip"))
}
if (grepl("\\.bz2$", f)) {
return(list(file = sub("\\.bz2$", "", f), compress = "bzip2"))
}
if (grepl("\\.bzip2$", f)) {
## weird
return(list(file = sub("\\.bzip2$", "", f), compress = "bzip2"))
}
return(list(file = f, compress = NA_character_))
}
compress_out <- function(cfile, filename, type = c("zip", "tar", "tar.gz", "tar.bz2", "gzip", "bzip2")) {
type <- ext <- match.arg(type)
cfile2 <- basename(cfile)
filename <- normalizePath(filename)
if (type %in% c("gzip", "bzip2")) {
return(.compress_rutils(filename, cfile, ext = ext))
}
tmp <- tempfile()
dir.create(tmp)
on.exit(unlink(tmp, recursive = TRUE), add = TRUE)
file.copy(from = filename, to = file.path(tmp, basename(filename)), overwrite = TRUE)
wd <- getwd()
on.exit(setwd(wd), add = TRUE)
setwd(tmp)
if (type == "zip") {
o <- utils::zip(cfile2, files = basename(filename))
}
if (type == "tar") {
o <- utils::tar(cfile2, files = basename(filename), compression = "none")
}
if (type == "tar.gz") {
o <- utils::tar(cfile2, files = basename(filename), compression = "gzip")
}
if (type == "tar.bz2") {
o <- utils::tar(cfile2, files = basename(filename), compression = "bzip2")
}
setwd(wd)
if (o != 0) {
stop(sprintf("File compression failed for %s!", cfile))
}
file.copy(from = file.path(tmp, cfile2), to = cfile, overwrite = TRUE)
unlink(file.path(tmp, cfile2))
return(cfile)
}
parse_archive <- function(file, which, file_type, ...) {
if (file_type %in% c("gzip", "bzip2")) {
## it doesn't have the same interface as unzip
return(.parse_rutils(filename = file, file_type = file_type))
}
if (file_type == "zip") {
extract_func <- utils::unzip
}
if (file_type %in% c("tar", "tar.gz", "tar.bz2")) {
extract_func <- utils::untar
}
file_list <- .list_archive(file, file_type)
d <- tempfile()
dir.create(d)
if (is.numeric(which)) {
extract_func(file, files = file_list[which], exdir = d)
return(file.path(d, file_list[which]))
}
if (substring(which, 1, 1) != "^") {
which2 <- paste0("^", which)
}
extract_func(file, files = file_list[grep(which2, file_list)[1]], exdir = d)
return(file.path(d, which))
}
.list_archive <- function(file, file_type = c("zip", "tar", "tar.gz", "tar.bz2")) {
## just a simple wrapper to unify the interface of utils::unzip and utils::untar
file_type <- match.arg(file_type)
if (file_type == "zip") {
file_list <- utils::unzip(file, list = TRUE)$Name
}
if (file_type %in% c("tar", "tar.gz", "tar.bz2")) {
file_list <- utils::untar(file, list = TRUE)
}
return(file_list)
}
.compress_rutils <- function(filename, cfile, ext, remove = TRUE, FUN = gzfile) {
## Caution: Please note that remove = TRUE by default, it will delete `filename`!
if (ext == "bzip2") {
FUN <- bzfile
}
tmp_cfile <- R.utils::compressFile(filename = filename, destname = tempfile(), ext = ext, FUN = FUN, overwrite = TRUE, remove = remove)
file.copy(from = tmp_cfile, to = cfile, overwrite = TRUE)
unlink(tmp_cfile)
return(cfile)
}
.parse_rutils <- function(filename, file_type) {
if (file_type == "gzip") {
decompression_fun <- gzfile
}
if (file_type == "bzip2") {
decompression_fun <- bzfile
}
destname <- tempfile()
R.utils::decompressFile(filename = filename, destname = destname, temporary = TRUE, remove = FALSE, overwrite = TRUE, FUN = decompression_fun, ext = file_type)
}
.check_tar_support <- function(file_type, rversion) {
if (file_type %in% c("tar", "tar.gz", "tar.bz2") && rversion < "4.0.3") {
stop("Exporting to tar formats is not supported for this version of R.", call. = FALSE)
}
NULL
}
.get_compressed_format <- function(cfile, file, file_type, format) {
if (file_type %in% c("gzip", "bzip2")) {
return(ifelse(isFALSE(missing(format)), tolower(format), get_info(find_compress(cfile)$file)$input))
}
## zip or tar formats, use the decompressed file path
return(ifelse(isFALSE(missing(format)), tolower(format), get_info(file)$input))
}
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