Rebol Programming/read-net

= USAGE: = READ-NET url /progress callback

= DESCRIPTION: = Read a file from the net (web). Update progress bar. Allow abort.

READ-NET is a function value. = ARGUMENTS =
 * url -- (Type: url)

= REFINEMENTS =
 * /progress
 * callback -- Call func [total bytes] during transfer. Return true. (Type: any)

= SOURCE CODE = read-net: func [ {Read a file from the net (web). Update progress bar. Allow abort.} url [url!] /progress callback {Call func [total bytes] during transfer. Return true.} /local port buffer data size ][   vbug ['read-net url] if error? try [port: open/direct url] [return none] size: to-integer any [port/locals/headers/content-length 8000] buffer: make binary! size set-modes port/sub-port [lines: false binary: true no-wait: true] until [ if not data: wait [60 port/sub-port] [data: true break] if data: copy port/sub-port [append buffer data] all [:callback size not callback size length? buffer data: true break] not data ]    close port if not data [buffer] ]