static int
standard( text_filter_context_t *tfx, IOBUF a,
byte *buf, size_t size, size_t *ret_len)
{
int rc=0;
size_t len = 0;
unsigned maxlen;
log_assert( size > 10 );
size -= 2; /* reserve 2 bytes to append CR,LF */
while( !rc && len < size ) {
int lf_seen;
while( len < size && tfx->buffer_pos < tfx->buffer_len )
buf[len++] = tfx->buffer[tfx->buffer_pos++];
if( len >= size )
continue;
/* read the next line */
maxlen = MAX_LINELEN;
tfx->buffer_pos = 0;
tfx->buffer_len = iobuf_read_line( a, &tfx->buffer,
&tfx->buffer_size, &maxlen );
if( !maxlen )
tfx->truncated++;
if( !tfx->buffer_len ) {
if( !len )
rc = -1; /* eof */
break;
}
lf_seen = tfx->buffer[tfx->buffer_len-1] == '\n';
/* The story behind this is that 2440 says that textmode
hashes should canonicalize line endings to CRLF and remove
spaces and tabs. 2440bis-12 says to just canonicalize to
CRLF. 1.4.0 was released using the bis-12 behavior, but it
was discovered that many mail clients do not canonicalize
PGP/MIME signature text appropriately (and were relying on
GnuPG to handle trailing spaces). So, we default to the
2440 behavior, but use the 2440bis-12 behavior if the user
specifies --no-rfc2440-text. The default will be changed
at some point in the future when the mail clients have been
upgraded. Aside from PGP/MIME and broken mail clients,
this makes no difference to any signatures in the real
world except for a textmode detached signature. PGP always
used the 2440bis-12 behavior (ignoring 2440 itself), so
this actually makes us compatible with PGP textmode
detached signatures for the first time. */
if(opt.rfc2440_text)
tfx->buffer_len=trim_trailing_chars(tfx->buffer,tfx->buffer_len,
" \t\r\n");
else
tfx->buffer_len=trim_trailing_chars(tfx->buffer,tfx->buffer_len,
"\r\n");
if( lf_seen ) {
tfx->buffer[tfx->buffer_len++] = '\r';
tfx->buffer[tfx->buffer_len++] = '\n';
}
}
*ret_len = len;
return rc;
}
/****************
* Remove trailing white spaces and return the length of the buffer
*/
unsigned
trim_trailing_ws( byte *line, unsigned len )
{
return trim_trailing_chars( line, len, " \t\r\n" );
}