1: /*
2: * Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC")
3: * Copyright (C) 2000-2003 Internet Software Consortium.
4: *
5: * Permission to use, copy, modify, and/or distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10: * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11: * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12: * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13: * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14: * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15: * PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: /* $Id: hex.c,v 1.1.1.1 2012/05/29 12:08:38 misho Exp $ */
19:
20: /*! \file */
21:
22: #include <config.h>
23:
24: #include <ctype.h>
25:
26: #include <isc/buffer.h>
27: #include <isc/hex.h>
28: #include <isc/lex.h>
29: #include <isc/string.h>
30: #include <isc/util.h>
31:
32: #define RETERR(x) do { \
33: isc_result_t _r = (x); \
34: if (_r != ISC_R_SUCCESS) \
35: return (_r); \
36: } while (0)
37:
38:
39: /*
40: * BEW: These static functions are copied from lib/dns/rdata.c.
41: */
42: static isc_result_t
43: str_totext(const char *source, isc_buffer_t *target);
44:
45: static isc_result_t
46: mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);
47:
48: static const char hex[] = "0123456789ABCDEF";
49:
50: isc_result_t
51: isc_hex_totext(isc_region_t *source, int wordlength,
52: const char *wordbreak, isc_buffer_t *target)
53: {
54: char buf[3];
55: unsigned int loops = 0;
56:
57: if (wordlength < 2)
58: wordlength = 2;
59:
60: memset(buf, 0, sizeof(buf));
61: while (source->length > 0) {
62: buf[0] = hex[(source->base[0] >> 4) & 0xf];
63: buf[1] = hex[(source->base[0]) & 0xf];
64: RETERR(str_totext(buf, target));
65: isc_region_consume(source, 1);
66:
67: loops++;
68: if (source->length != 0 &&
69: (int)((loops + 1) * 2) >= wordlength)
70: {
71: loops = 0;
72: RETERR(str_totext(wordbreak, target));
73: }
74: }
75: return (ISC_R_SUCCESS);
76: }
77:
78: /*%
79: * State of a hex decoding process in progress.
80: */
81: typedef struct {
82: int length; /*%< Desired length of binary data or -1 */
83: isc_buffer_t *target; /*%< Buffer for resulting binary data */
84: int digits; /*%< Number of buffered hex digits */
85: int val[2];
86: } hex_decode_ctx_t;
87:
88: static inline void
89: hex_decode_init(hex_decode_ctx_t *ctx, int length, isc_buffer_t *target)
90: {
91: ctx->digits = 0;
92: ctx->length = length;
93: ctx->target = target;
94: }
95:
96: static inline isc_result_t
97: hex_decode_char(hex_decode_ctx_t *ctx, int c) {
98: char *s;
99:
100: if ((s = strchr(hex, toupper(c))) == NULL)
101: return (ISC_R_BADHEX);
102: ctx->val[ctx->digits++] = s - hex;
103: if (ctx->digits == 2) {
104: unsigned char num;
105:
106: num = (ctx->val[0] << 4) + (ctx->val[1]);
107: RETERR(mem_tobuffer(ctx->target, &num, 1));
108: if (ctx->length >= 0) {
109: if (ctx->length == 0)
110: return (ISC_R_BADHEX);
111: else
112: ctx->length -= 1;
113: }
114: ctx->digits = 0;
115: }
116: return (ISC_R_SUCCESS);
117: }
118:
119: static inline isc_result_t
120: hex_decode_finish(hex_decode_ctx_t *ctx) {
121: if (ctx->length > 0)
122: return (ISC_R_UNEXPECTEDEND);
123: if (ctx->digits != 0)
124: return (ISC_R_BADHEX);
125: return (ISC_R_SUCCESS);
126: }
127:
128: isc_result_t
129: isc_hex_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
130: hex_decode_ctx_t ctx;
131: isc_textregion_t *tr;
132: isc_token_t token;
133: isc_boolean_t eol;
134:
135: hex_decode_init(&ctx, length, target);
136:
137: while (ctx.length != 0) {
138: unsigned int i;
139:
140: if (length > 0)
141: eol = ISC_FALSE;
142: else
143: eol = ISC_TRUE;
144: RETERR(isc_lex_getmastertoken(lexer, &token,
145: isc_tokentype_string, eol));
146: if (token.type != isc_tokentype_string)
147: break;
148: tr = &token.value.as_textregion;
149: for (i = 0; i < tr->length; i++)
150: RETERR(hex_decode_char(&ctx, tr->base[i]));
151: }
152: if (ctx.length < 0)
153: isc_lex_ungettoken(lexer, &token);
154: RETERR(hex_decode_finish(&ctx));
155: return (ISC_R_SUCCESS);
156: }
157:
158: isc_result_t
159: isc_hex_decodestring(const char *cstr, isc_buffer_t *target) {
160: hex_decode_ctx_t ctx;
161:
162: hex_decode_init(&ctx, -1, target);
163: for (;;) {
164: int c = *cstr++;
165: if (c == '\0')
166: break;
167: if (c == ' ' || c == '\t' || c == '\n' || c== '\r')
168: continue;
169: RETERR(hex_decode_char(&ctx, c));
170: }
171: RETERR(hex_decode_finish(&ctx));
172: return (ISC_R_SUCCESS);
173: }
174:
175: static isc_result_t
176: str_totext(const char *source, isc_buffer_t *target) {
177: unsigned int l;
178: isc_region_t region;
179:
180: isc_buffer_availableregion(target, ®ion);
181: l = strlen(source);
182:
183: if (l > region.length)
184: return (ISC_R_NOSPACE);
185:
186: memcpy(region.base, source, l);
187: isc_buffer_add(target, l);
188: return (ISC_R_SUCCESS);
189: }
190:
191: static isc_result_t
192: mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length) {
193: isc_region_t tr;
194:
195: isc_buffer_availableregion(target, &tr);
196: if (length > tr.length)
197: return (ISC_R_NOSPACE);
198: memcpy(tr.base, base, length);
199: isc_buffer_add(target, length);
200: return (ISC_R_SUCCESS);
201: }
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