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110 lines
2 KiB
C
110 lines
2 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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ASN.1 utility functions
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Copyright 2012 Henrik Andersson <hean01@cendio.se> for Cendio AB
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precomp.h"
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/* Parse an ASN.1 BER header */
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RD_BOOL
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ber_parse_header(STREAM s, int tagval, int *length)
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{
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int tag, len;
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if (tagval > 0xff)
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{
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in_uint16_be(s, tag);
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}
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else
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{
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in_uint8(s, tag);
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}
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if (tag != tagval)
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{
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error("expected tag %d, got %d\n", tagval, tag);
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return False;
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}
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in_uint8(s, len);
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if (len & 0x80)
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{
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len &= ~0x80;
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*length = 0;
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while (len--)
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next_be(s, *length);
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}
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else
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*length = len;
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return s_check(s);
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}
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/* Output an ASN.1 BER header */
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void
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ber_out_header(STREAM s, int tagval, int length)
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{
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if (tagval > 0xff)
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{
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out_uint16_be(s, tagval);
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}
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else
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{
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out_uint8(s, tagval);
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}
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if (length >= 0x80)
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{
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out_uint8(s, 0x82);
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out_uint16_be(s, length);
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}
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else
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out_uint8(s, length);
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}
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/* Output an ASN.1 BER integer */
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void
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ber_out_integer(STREAM s, int value)
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{
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ber_out_header(s, BER_TAG_INTEGER, 2);
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out_uint16_be(s, value);
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}
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RD_BOOL
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ber_in_header(STREAM s, int *tagval, int *decoded_len)
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{
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in_uint8(s, *tagval);
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in_uint8(s, *decoded_len);
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if (*decoded_len < 0x80)
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return True;
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else if (*decoded_len == 0x81)
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{
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in_uint8(s, *decoded_len);
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return True;
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}
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else if (*decoded_len == 0x82)
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{
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in_uint16_be(s, *decoded_len);
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return True;
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}
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return False;
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}
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