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Brian Smith
nettle
Commits
b64b3086
Commit
b64b3086
authored
Oct 21, 2002
by
Niels Möller
Browse files
(sexp_transport_iterator_first): New file and
function. Rev: src/nettle/sexp-transport.c:1.1
parent
e2e07b99
Changes
1
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Inline
Side-by-side
sexp-transport.c
0 → 100644
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b64b3086
/* sexp-transport.c
*
* Parsing s-expressions in transport format.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#include "sexp.h"
#include "base64.h"
#include <assert.h>
#include <string.h>
/* NOTE: Decodes the input string in place */
int
sexp_transport_iterator_first
(
struct
sexp_iterator
*
iterator
,
unsigned
length
,
uint8_t
*
input
)
{
/* We first base64 decode any transport encoded sexp at the start of
* the input. */
unsigned
in
=
0
;
unsigned
out
=
0
;
while
(
in
<
length
)
switch
(
input
[
in
])
{
case
' '
:
/* SPC, TAB, LF, CR */
case
'\t'
:
case
'\n'
:
case
'\r'
:
in
++
;
break
;
case
';'
:
/* Comments */
while
(
++
in
<
length
&&
input
[
in
]
!=
'\n'
)
;
break
;
case
'{'
:
{
/* Found transport encoding */
struct
base64_decode_ctx
ctx
;
unsigned
end
;
for
(
end
=
++
in
;
end
<
length
&&
input
[
end
]
!=
'}'
;
end
++
)
;
if
(
end
==
length
)
return
0
;
base64_decode_init
(
&
ctx
);
out
+=
base64_decode_update
(
&
ctx
,
input
+
out
,
end
-
in
,
input
+
in
);
if
(
!
base64_decode_status
(
&
ctx
))
return
0
;
in
=
end
+
1
;
break
;
}
default:
/* Expression isn't in transport encoding. Rest of the input
* should be in canonical encoding. */
goto
transport_done
;
}
transport_done:
/* Here, we have two, possibly empty, input parts in canonical
* encoding:
*
* 0...out-1, in...length -1
*
* If the input was already in canonical encoding, out = 0 and in =
* amount of leading space.
*
* If all input was in transport encoding, in == length.
*/
if
(
!
out
)
{
input
+=
in
;
length
-=
in
;
}
else
if
(
in
==
length
)
length
=
out
;
else
if
(
out
==
in
)
/* Unusual case, nothing happens */
;
else
{
/* Both parts non-empty */
assert
(
out
<
in
);
memmove
(
input
+
out
,
input
+
in
,
length
-
in
);
length
-=
(
in
-
out
);
}
return
sexp_iterator_first
(
iterator
,
length
,
input
);
}
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