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# benchmark, comparing reading of largish simple feature objects from WKB
WKB_LINESTRING = function(m = 1, n) {
stopifnot(m > 0 && n > 1)
l = lapply(seq_len(m), function(x) {
con = rawConnection(raw(0), "w")
writeBin(as.raw(1), con) # "little"
writeBin(2L, con, 4) # "XY", "LINESTRING"
writeBin(as.integer(n), con, 4) # npts
writeBin(as.double(1:(2*n)), con)
r = rawConnectionValue(con)
close(con)
r
})
structure(l, class = "WKB")
}
WKB_MULTILINESTRING = function(m = 1, n = 2, p = 2) {
con = rawConnection(raw(0), "w")
writeBin(as.raw(1), con) # "little"
writeBin(5L, con, 4) # "XY", "MULTILINESTRING"
writeBin(as.integer(n), con, 4) # nlines
r = rawConnectionValue(con)
close(con)
structure(list(do.call(c, append(r, WKB_LINESTRING(n, p)))), class = "WKB")
}
mls = WKB_MULTILINESTRING(1, 5e5)
ls1 = WKB_LINESTRING(1, 1e6)
ls2 = WKB_LINESTRING(5e5, 2)
system.time(sf::st_as_sfc(mls, pureR = TRUE))
system.time(sf::st_as_sfc(mls))
system.time( wkb::readWKB(mls))
system.time(sf::st_as_sfc(ls1, pureR = TRUE))
system.time(sf::st_as_sfc(ls1))
system.time( wkb::readWKB(ls1))
system.time(sf::st_as_sfc(ls2, pureR = TRUE))
system.time(sf::st_as_sfc(ls2))
system.time( wkb::readWKB(ls2))