mirror of https://github.com/FreeRDP/FreeRDP
175 lines
3.4 KiB
C
175 lines
3.4 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Client
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* ASN.1 Packed Encoding Rules (BER)
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*
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "per.h"
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/**
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* Write PER length.
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* @param s stream
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* @param length length
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*/
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void
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per_write_length(STREAM* s, int length)
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{
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if (length > 0x7F)
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stream_write_uint16_be(s, (length | 0x8000));
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else
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stream_write_uint8(s, length);
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}
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/**
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* Write PER CHOICE.
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* @param s stream
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* @param choice index of chosen field
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*/
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void
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per_write_choice(STREAM* s, uint8 choice)
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{
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stream_write_uint8(s, choice);
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}
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/**
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* Write PER selection for OPTIONAL fields.
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* @param s stream
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* @param selection bit map of selected fields
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*/
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void
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per_write_selection(STREAM* s, uint8 selection)
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{
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stream_write_uint8(s, selection);
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}
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/**
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* Write PER number of sets for SET OF.
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* @param s stream
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* @param number number of sets
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*/
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void
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per_write_number_of_sets(STREAM* s, uint8 number)
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{
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stream_write_uint8(s, number);
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}
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/**
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* Write PER padding with zeros.
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* @param s stream
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* @param length
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*/
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void
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per_write_padding(STREAM* s, int length)
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{
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int i;
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for (i = 0; i < length; i++)
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stream_write_uint8(s, 0);
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}
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/**
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* Write PER OBJECT_IDENTIFIER (OID)
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* @param s stream
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* @param oid object identifier (oid)
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*/
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void
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per_write_object_identifier(STREAM* s, uint8 oid[6])
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{
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uint8 t12 = (oid[0] << 4) & (oid[1] & 0x0F);
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stream_write_uint8(s, 5); /* length */
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stream_write_uint8(s, t12); /* first two tuples */
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stream_write_uint8(s, oid[2]); /* tuple 3 */
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stream_write_uint8(s, oid[3]); /* tuple 4 */
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stream_write_uint8(s, oid[4]); /* tuple 5 */
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stream_write_uint8(s, oid[5]); /* tuple 6 */
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}
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/**
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* Write PER string.
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* @param s stream
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* @param str string
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* @param length string length
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*/
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void
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per_write_string(STREAM* s, uint8* str, int length)
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{
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int i;
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for (i = 0; i < length; i++)
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stream_write_uint8(s, str[i]);
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}
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/**
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* Write PER OCTET_STRING
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* @param s stream
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* @param oct_str octet string
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* @param length string length
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* @param min minimum string length
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*/
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void
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per_write_octet_string(STREAM* s, uint8* oct_str, int length, int min)
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{
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int i;
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int mlength;
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mlength = (length - min >= 0) ? length - min : min;
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per_write_length(s, mlength);
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for (i = 0; i < length; i++)
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stream_write_uint8(s, oct_str[i]);
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}
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/**
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* Write PER NumericString.
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* @param s stream
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* @param num_str numeric string
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* @param length string length
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* @param min minimum string length
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*/
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void
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per_write_numeric_string(STREAM* s, uint8* num_str, int length, int min)
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{
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int i;
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int mlength;
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uint8 num, c1, c2;
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mlength = (length - min >= 0) ? length - min : min;
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per_write_length(s, mlength);
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for (i = 0; i < length; i += 2)
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{
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c1 = num_str[i];
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c2 = ((i + 1) < length) ? num_str[i + 1] : 0x30;
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c1 = (c1 - 0x30) % 10;
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c2 = (c2 - 0x30) % 10;
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num = (c1 << 4) | c2;
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stream_write_uint8(s, num); /* string */
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}
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}
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