1 /* crypto/asn1/a_bitstr.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
63 /* ASN1err(ASN1_F_ASN1_STRING_NEW,ASN1_R_STRING_TOO_SHORT);
64 * ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,ASN1_R_EXPECTING_A_BIT_STRING);
67 int i2d_ASN1_BIT_STRING(a,pp)
74 if (a == NULL) return(0);
80 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
82 bits=(int)a->flags&0x07;
86 for ( ; len > 0; len--)
88 if (a->data[len-1]) break;
92 else if (j & 0x02) bits=1;
93 else if (j & 0x04) bits=2;
94 else if (j & 0x08) bits=3;
95 else if (j & 0x10) bits=4;
96 else if (j & 0x20) bits=5;
97 else if (j & 0x40) bits=6;
98 else if (j & 0x80) bits=7;
99 else bits=0; /* should not happen */
105 r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
106 if (pp == NULL) return(r);
109 ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
110 *(p++)=(unsigned char)bits;
114 if (len > 0) p[-1]&=(0xff<<bits);
119 ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(a, pp, length)
124 ASN1_BIT_STRING *ret=NULL;
130 if ((a == NULL) || ((*a) == NULL))
132 if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
138 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
141 i=ASN1_R_BAD_OBJECT_HEADER;
145 if (tag != V_ASN1_BIT_STRING)
147 i=ASN1_R_EXPECTING_A_BIT_STRING;
150 if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
153 /* We do this to preserve the settings. If we modify
154 * the settings, via the _set_bit function, we will recalculate
156 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
157 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
159 if (len-- > 1) /* using one because of the bits left byte */
161 s=(unsigned char *)Malloc((int)len);
164 i=ERR_R_MALLOC_FAILURE;
167 memcpy(s,p,(int)len);
174 ret->length=(int)len;
175 if (ret->data != NULL) Free((char *)ret->data);
177 ret->type=V_ASN1_BIT_STRING;
178 if (a != NULL) (*a)=ret;
182 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
183 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
184 ASN1_BIT_STRING_free(ret);
188 /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
190 int ASN1_BIT_STRING_set_bit(a,n,value)
202 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
204 if (a == NULL) return(0);
205 if ((a->length < (w+1)) || (a->data == NULL))
207 if (!value) return(1); /* Don't need to set */
209 c=(unsigned char *)Malloc(w+1);
211 c=(unsigned char *)Realloc(a->data,w+1);
212 if (c == NULL) return(0);
217 a->data[w]=((a->data[w])&iv)|v;
218 while ((a->length > 0) && (a->data[a->length-1] == 0))
223 int ASN1_BIT_STRING_get_bit(a,n)
231 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
233 return((a->data[w]&v) != 0);