Bug#539442: libvformat1: space and tab uncorrectly handled when unfolding

Package: libvformat1
Version: 1.13-4
Severity: normal
Tags: patch

A leading SPACE of a folded line is incorrectly added to the current string and 
a TAB makes the string end prematurely.

The attached test case prints
1234567890 abcdefghij
while the expected behaviour is
1234567890abcdefghij1234567890

According to paragraph 5.8.1. of RFC 2425 both SPACE and TAB should be ignored:
" A logical line MAY be continued on the next physical line anywhere
   between two characters by inserting a CRLF immediately followed by a
   single white space character (space, ASCII decimal 32, or horizontal
   tab, ASCII decimal 9). At least one character must be present on the
   folded line. Any sequence of CRLF followed immediately by a single
   white space character is ignored (removed) when processing the
   content type."

-- System Information:
Debian Release: 5.0
  APT prefers jaunty-updates
  APT policy: (500, 'jaunty-updates'), (500, 'jaunty-security'), (500, 'jaunty')
Architecture: i386 (i686)

Kernel: Linux 2.6.28-14-generic (SMP w/1 CPU core)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

testcase.c
Description: Text Data

unfolding.patch
Description: Text Data