From ab959d7b4194715870128e616b8e29d4a101e488 Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:41 +0200 Subject: Imported Upstream version 1.1.1+rev1207 --- lib/libdvben50221/asn_1.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 lib/libdvben50221/asn_1.c (limited to 'lib/libdvben50221/asn_1.c') diff --git a/lib/libdvben50221/asn_1.c b/lib/libdvben50221/asn_1.c new file mode 100644 index 0000000..803eb60 --- /dev/null +++ b/lib/libdvben50221/asn_1.c @@ -0,0 +1,83 @@ +/* + ASN.1 routines, implementation for libdvben50221 + an implementation for the High Level Common Interface + + Copyright (C) 2004, 2005 Manu Abraham + Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net) + + This 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. + + This program 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 this library; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include +#include "asn_1.h" + +int asn_1_decode(uint16_t * length, uint8_t * asn_1_array, + uint32_t asn_1_array_len) +{ + uint8_t length_field; + + if (asn_1_array_len < 1) + return -1; + length_field = asn_1_array[0]; + + if (length_field < 0x80) { + // there is only one word + *length = length_field & 0x7f; + return 1; + } else if (length_field == 0x81) { + if (asn_1_array_len < 2) + return -1; + + *length = asn_1_array[1]; + return 2; + } else if (length_field == 0x82) { + if (asn_1_array_len < 3) + return -1; + + *length = (asn_1_array[1] << 8) | asn_1_array[2]; + return 3; + } + + return -1; +} + +int asn_1_encode(uint16_t length, uint8_t * asn_1_array, + uint32_t asn_1_array_len) +{ + if (length < 0x80) { + if (asn_1_array_len < 1) + return -1; + + asn_1_array[0] = length & 0x7f; + return 1; + } else if (length < 0x100) { + if (asn_1_array_len < 2) + return -1; + + asn_1_array[0] = 0x81; + asn_1_array[1] = length; + return 2; + } else { + if (asn_1_array_len < 3) + return -1; + + asn_1_array[0] = 0x82; + asn_1_array[1] = length >> 8; + asn_1_array[2] = length; + return 3; + } + + // never reached +} -- cgit v1.2.3