Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 1 | /*- |
Lev Walkin | 725883b | 2006-10-09 12:07:58 +0000 | [diff] [blame] | 2 | * Copyright (c) 2004, 2006 Lev Walkin <vlm@lionet.info>. All rights reserved. |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 3 | * Redistribution and modifications are permitted subject to BSD license. |
| 4 | */ |
Lev Walkin | 3370016 | 2004-10-26 09:03:31 +0000 | [diff] [blame] | 5 | #if defined(__alpha) |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 6 | #define _ISOC99_SOURCE /* For quiet NAN, through bits/nan.h */ |
| 7 | #define _BSD_SOURCE /* To reintroduce finite(3) */ |
| 8 | #include <sys/resource.h> /* For INFINITY */ |
Lev Walkin | 3370016 | 2004-10-26 09:03:31 +0000 | [diff] [blame] | 9 | #endif |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 10 | #include <asn_internal.h> |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 11 | #include <stdlib.h> /* for strtod(3) */ |
| 12 | #include <math.h> |
| 13 | #include <errno.h> |
Lev Walkin | 3370016 | 2004-10-26 09:03:31 +0000 | [diff] [blame] | 14 | #include <REAL.h> |
Lev Walkin | 725883b | 2006-10-09 12:07:58 +0000 | [diff] [blame] | 15 | #include <OCTET_STRING.h> |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 16 | |
| 17 | #undef INT_MAX |
| 18 | #define INT_MAX ((int)(((unsigned int)-1) >> 1)) |
| 19 | |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 20 | #if !(defined(NAN) || defined(INFINITY)) |
Lev Walkin | 50b0f6c | 2006-10-16 12:01:36 +0000 | [diff] [blame] | 21 | static volatile double real_zero GCC_NOTUSED = 0.0; |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 22 | #endif |
Lev Walkin | ae1bce9 | 2004-09-27 22:18:34 +0000 | [diff] [blame] | 23 | #ifndef NAN |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 24 | #define NAN (real_zero/real_zero) |
Lev Walkin | 40319a1 | 2004-09-14 13:40:42 +0000 | [diff] [blame] | 25 | #endif |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 26 | #ifndef INFINITY |
| 27 | #define INFINITY (1.0/real_zero) |
| 28 | #endif |
Lev Walkin | 40319a1 | 2004-09-14 13:40:42 +0000 | [diff] [blame] | 29 | |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 30 | /* |
| 31 | * REAL basic type description. |
| 32 | */ |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 33 | static ber_tlv_tag_t asn_DEF_REAL_tags[] = { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 34 | (ASN_TAG_CLASS_UNIVERSAL | (9 << 2)) |
| 35 | }; |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 36 | asn_TYPE_descriptor_t asn_DEF_REAL = { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 37 | "REAL", |
Lev Walkin | dc06f6b | 2004-10-20 15:50:55 +0000 | [diff] [blame] | 38 | "REAL", |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 39 | ASN__PRIMITIVE_TYPE_free, |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 40 | REAL_print, |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 41 | asn_generic_no_constraint, |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 42 | ber_decode_primitive, |
| 43 | der_encode_primitive, |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 44 | REAL_decode_xer, |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 45 | REAL_encode_xer, |
Lev Walkin | 725883b | 2006-10-09 12:07:58 +0000 | [diff] [blame] | 46 | REAL_decode_uper, |
| 47 | REAL_encode_uper, |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 48 | 0, /* Use generic outmost tag fetcher */ |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 49 | asn_DEF_REAL_tags, |
| 50 | sizeof(asn_DEF_REAL_tags) / sizeof(asn_DEF_REAL_tags[0]), |
| 51 | asn_DEF_REAL_tags, /* Same as above */ |
| 52 | sizeof(asn_DEF_REAL_tags) / sizeof(asn_DEF_REAL_tags[0]), |
Lev Walkin | 59b176e | 2005-11-26 11:25:14 +0000 | [diff] [blame] | 53 | 0, /* No PER visible constraints */ |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 54 | 0, 0, /* No members */ |
| 55 | 0 /* No specifics */ |
| 56 | }; |
| 57 | |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 58 | typedef enum specialRealValue { |
| 59 | SRV__NOT_A_NUMBER, |
| 60 | SRV__MINUS_INFINITY, |
| 61 | SRV__PLUS_INFINITY |
| 62 | } specialRealValue_e; |
| 63 | static struct specialRealValue_s { |
| 64 | char *string; |
Lev Walkin | 8471cec | 2004-10-21 14:02:19 +0000 | [diff] [blame] | 65 | size_t length; |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 66 | long dv; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 67 | } specialRealValue[] = { |
| 68 | #define SRV_SET(foo, val) { foo, sizeof(foo) - 1, val } |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 69 | SRV_SET("<NOT-A-NUMBER/>", 0), |
| 70 | SRV_SET("<MINUS-INFINITY/>", -1), |
| 71 | SRV_SET("<PLUS-INFINITY/>", 1), |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 72 | #undef SRV_SET |
| 73 | }; |
| 74 | |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 75 | ssize_t |
| 76 | REAL__dump(double d, int canonical, asn_app_consume_bytes_f *cb, void *app_key) { |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 77 | char local_buf[64]; |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 78 | char *buf = local_buf; |
| 79 | ssize_t buflen = sizeof(local_buf); |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 80 | const char *fmt = canonical?"%.15E":"%.15f"; |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 81 | ssize_t ret; |
| 82 | |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 83 | /* |
| 84 | * Check whether it is a special value. |
| 85 | */ |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 86 | /* fpclassify(3) is not portable yet */ |
| 87 | if(isnan(d)) { |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 88 | buf = specialRealValue[SRV__NOT_A_NUMBER].string; |
| 89 | buflen = specialRealValue[SRV__NOT_A_NUMBER].length; |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 90 | return (cb(buf, buflen, app_key) < 0) ? -1 : buflen; |
Lev Walkin | a460ba3 | 2004-10-20 15:40:04 +0000 | [diff] [blame] | 91 | } else if(!finite(d)) { |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 92 | if(copysign(1.0, d) < 0.0) { |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 93 | buf = specialRealValue[SRV__MINUS_INFINITY].string; |
| 94 | buflen = specialRealValue[SRV__MINUS_INFINITY].length; |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 95 | } else { |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 96 | buf = specialRealValue[SRV__PLUS_INFINITY].string; |
| 97 | buflen = specialRealValue[SRV__PLUS_INFINITY].length; |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 98 | } |
| 99 | return (cb(buf, buflen, app_key) < 0) ? -1 : buflen; |
| 100 | } else if(ilogb(d) <= -INT_MAX) { |
| 101 | if(copysign(1.0, d) < 0.0) { |
| 102 | buf = "-0"; |
| 103 | buflen = 2; |
| 104 | } else { |
| 105 | buf = "0"; |
| 106 | buflen = 1; |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 107 | } |
| 108 | return (cb(buf, buflen, app_key) < 0) ? -1 : buflen; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Use the libc's double printing, hopefully they got it right. |
| 113 | */ |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 114 | do { |
| 115 | ret = snprintf(buf, buflen, fmt, d); |
| 116 | if(ret < 0) { |
| 117 | buflen <<= 1; |
| 118 | } else if(ret >= buflen) { |
| 119 | buflen = ret + 1; |
| 120 | } else { |
| 121 | buflen = ret; |
| 122 | break; |
| 123 | } |
Lev Walkin | 419f675 | 2006-09-13 04:02:00 +0000 | [diff] [blame] | 124 | if(buf != local_buf) FREEMEM(buf); |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 125 | buf = (char *)MALLOC(buflen); |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 126 | if(!buf) return -1; |
| 127 | } while(1); |
| 128 | |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 129 | if(canonical) { |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 130 | /* |
| 131 | * Transform the "[-]d.dddE+-dd" output into "[-]d.dddE[-]d" |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 132 | * Check that snprintf() constructed the output correctly. |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 133 | */ |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 134 | char *dot, *E; |
| 135 | char *end = buf + buflen; |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 136 | char *last_zero; |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 137 | |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 138 | dot = (buf[0] == 0x2d /* '-' */) ? (buf + 2) : (buf + 1); |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 139 | if(*dot >= 0x30) { |
| 140 | errno = EINVAL; |
| 141 | return -1; /* Not a dot, really */ |
| 142 | } |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 143 | *dot = 0x2e; /* Replace possible comma */ |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 144 | |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 145 | for(last_zero = dot + 2, E = dot; dot < end; E++) { |
| 146 | if(*E == 0x45) { |
| 147 | char *expptr = ++E; |
| 148 | char *s = expptr; |
| 149 | int sign; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 150 | if(*expptr == 0x2b /* '+' */) { |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 151 | /* Skip the "+" */ |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 152 | buflen -= 1; |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 153 | sign = 0; |
| 154 | } else { |
| 155 | sign = 1; |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 156 | s++; |
| 157 | } |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 158 | expptr++; |
| 159 | if(expptr > end) { |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 160 | errno = EINVAL; |
| 161 | return -1; |
| 162 | } |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 163 | if(*expptr == 0x30) { |
| 164 | buflen--; |
| 165 | expptr++; |
| 166 | } |
| 167 | if(*last_zero == 0x30) { |
| 168 | *last_zero = 0x45; /* E */ |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 169 | buflen -= s - (last_zero + 1); |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 170 | s = last_zero + 1; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 171 | if(sign) { |
| 172 | *s++ = 0x2d /* '-' */; |
| 173 | buflen++; |
| 174 | } |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 175 | } |
| 176 | for(; expptr <= end; s++, expptr++) |
| 177 | *s = *expptr; |
| 178 | break; |
| 179 | } else if(*E == 0x30) { |
| 180 | if(*last_zero != 0x30) |
| 181 | last_zero = E; |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 182 | } |
| 183 | } |
| 184 | if(E == end) { |
| 185 | errno = EINVAL; |
| 186 | return -1; /* No promised E */ |
| 187 | } |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 188 | } else { |
| 189 | /* |
| 190 | * Remove trailing zeros. |
| 191 | */ |
| 192 | char *end = buf + buflen; |
| 193 | char *last_zero = end; |
Lev Walkin | f0b808d | 2005-04-25 21:08:25 +0000 | [diff] [blame] | 194 | int stoplooking = 0; |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 195 | char *z; |
| 196 | for(z = end - 1; z > buf; z--) { |
| 197 | switch(*z) { |
Lev Walkin | f0b808d | 2005-04-25 21:08:25 +0000 | [diff] [blame] | 198 | case 0x30: |
| 199 | if(!stoplooking) |
| 200 | last_zero = z; |
| 201 | continue; |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 202 | case 0x31: case 0x32: case 0x33: case 0x34: |
| 203 | case 0x35: case 0x36: case 0x37: case 0x38: case 0x39: |
Lev Walkin | f0b808d | 2005-04-25 21:08:25 +0000 | [diff] [blame] | 204 | stoplooking = 1; |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 205 | continue; |
| 206 | default: /* Catch dot and other separators */ |
Lev Walkin | f0b808d | 2005-04-25 21:08:25 +0000 | [diff] [blame] | 207 | /* |
| 208 | * Replace possible comma (which may even |
| 209 | * be not a comma at all: locale-defined). |
| 210 | */ |
| 211 | *z = 0x2e; |
Lev Walkin | 92b35d2 | 2004-09-27 20:52:18 +0000 | [diff] [blame] | 212 | if(last_zero == z + 1) { /* leave x.0 */ |
| 213 | last_zero++; |
| 214 | } |
| 215 | buflen = last_zero - buf; |
| 216 | *last_zero = '\0'; |
| 217 | break; |
| 218 | } |
| 219 | break; |
| 220 | } |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | ret = cb(buf, buflen, app_key); |
Lev Walkin | 419f675 | 2006-09-13 04:02:00 +0000 | [diff] [blame] | 224 | if(buf != local_buf) FREEMEM(buf); |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 225 | return (ret < 0) ? -1 : buflen; |
| 226 | } |
| 227 | |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 228 | int |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 229 | REAL_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel, |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 230 | asn_app_consume_bytes_f *cb, void *app_key) { |
| 231 | const REAL_t *st = (const REAL_t *)sptr; |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 232 | ssize_t ret; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 233 | double d; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 234 | |
| 235 | (void)td; /* Unused argument */ |
| 236 | (void)ilevel; /* Unused argument */ |
| 237 | |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 238 | if(!st || !st->buf) |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 239 | ret = cb("<absent>", 8, app_key); |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 240 | else if(asn_REAL2double(st, &d)) |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 241 | ret = cb("<error>", 7, app_key); |
| 242 | else |
| 243 | ret = REAL__dump(d, 0, cb, app_key); |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 244 | |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 245 | return (ret < 0) ? -1 : 0; |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 246 | } |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 247 | |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 248 | asn_enc_rval_t |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 249 | REAL_encode_xer(asn_TYPE_descriptor_t *td, void *sptr, |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 250 | int ilevel, enum xer_encoder_flags_e flags, |
| 251 | asn_app_consume_bytes_f *cb, void *app_key) { |
| 252 | REAL_t *st = (REAL_t *)sptr; |
| 253 | asn_enc_rval_t er; |
| 254 | double d; |
| 255 | |
| 256 | (void)ilevel; |
| 257 | |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 258 | if(!st || !st->buf || asn_REAL2double(st, &d)) |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 259 | _ASN_ENCODE_FAILED; |
| 260 | |
| 261 | er.encoded = REAL__dump(d, flags & XER_F_CANONICAL, cb, app_key); |
| 262 | if(er.encoded < 0) _ASN_ENCODE_FAILED; |
| 263 | |
Lev Walkin | 59b176e | 2005-11-26 11:25:14 +0000 | [diff] [blame] | 264 | _ASN_ENCODED_OK(er); |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 265 | } |
| 266 | |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 267 | |
| 268 | /* |
| 269 | * Decode the chunk of XML text encoding REAL. |
| 270 | */ |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 271 | static enum xer_pbd_rval |
| 272 | REAL__xer_body_decode(asn_TYPE_descriptor_t *td, void *sptr, const void *chunk_buf, size_t chunk_size) { |
Lev Walkin | 8471cec | 2004-10-21 14:02:19 +0000 | [diff] [blame] | 273 | REAL_t *st = (REAL_t *)sptr; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 274 | double value; |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 275 | const char *xerdata = (const char *)chunk_buf; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 276 | char *endptr = 0; |
| 277 | char *b; |
| 278 | |
Lev Walkin | e0b56e0 | 2005-02-25 12:10:27 +0000 | [diff] [blame] | 279 | (void)td; |
| 280 | |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 281 | if(!chunk_size) return XPBD_BROKEN_ENCODING; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 282 | |
| 283 | /* |
| 284 | * Decode an XMLSpecialRealValue: <MINUS-INFINITY>, etc. |
| 285 | */ |
| 286 | if(xerdata[0] == 0x3c /* '<' */) { |
| 287 | size_t i; |
| 288 | for(i = 0; i < sizeof(specialRealValue) |
| 289 | / sizeof(specialRealValue[0]); i++) { |
| 290 | struct specialRealValue_s *srv = &specialRealValue[i]; |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 291 | double dv; |
| 292 | |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 293 | if(srv->length != chunk_size |
| 294 | || memcmp(srv->string, chunk_buf, chunk_size)) |
| 295 | continue; |
| 296 | |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 297 | /* |
| 298 | * It could've been done using |
| 299 | * (double)srv->dv / real_zero, |
| 300 | * but it summons fp exception on some platforms. |
| 301 | */ |
| 302 | switch(srv->dv) { |
| 303 | case -1: dv = - INFINITY; break; |
| 304 | case 0: dv = NAN; break; |
| 305 | case 1: dv = INFINITY; break; |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 306 | default: return XPBD_SYSTEM_FAILURE; |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 307 | } |
| 308 | |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 309 | if(asn_double2REAL(st, dv)) |
| 310 | return XPBD_SYSTEM_FAILURE; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 311 | |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 312 | return XPBD_BODY_CONSUMED; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 313 | } |
| 314 | ASN_DEBUG("Unknown XMLSpecialRealValue"); |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 315 | return XPBD_BROKEN_ENCODING; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Copy chunk into the nul-terminated string, and run strtod. |
| 320 | */ |
Lev Walkin | 8471cec | 2004-10-21 14:02:19 +0000 | [diff] [blame] | 321 | b = (char *)MALLOC(chunk_size + 1); |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 322 | if(!b) return XPBD_SYSTEM_FAILURE; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 323 | memcpy(b, chunk_buf, chunk_size); |
Lev Walkin | 8471cec | 2004-10-21 14:02:19 +0000 | [diff] [blame] | 324 | b[chunk_size] = 0; /* nul-terminate */ |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 325 | |
| 326 | value = strtod(b, &endptr); |
Lev Walkin | 419f675 | 2006-09-13 04:02:00 +0000 | [diff] [blame] | 327 | FREEMEM(b); |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 328 | if(endptr == b) return XPBD_BROKEN_ENCODING; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 329 | |
| 330 | if(asn_double2REAL(st, value)) |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 331 | return XPBD_SYSTEM_FAILURE; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 332 | |
Lev Walkin | 0fab1a6 | 2005-03-09 22:19:25 +0000 | [diff] [blame] | 333 | return XPBD_BODY_CONSUMED; |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | asn_dec_rval_t |
| 337 | REAL_decode_xer(asn_codec_ctx_t *opt_codec_ctx, |
| 338 | asn_TYPE_descriptor_t *td, void **sptr, const char *opt_mname, |
Lev Walkin | 8c3b854 | 2005-03-10 18:52:02 +0000 | [diff] [blame] | 339 | const void *buf_ptr, size_t size) { |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 340 | |
| 341 | return xer_decode_primitive(opt_codec_ctx, td, |
Lev Walkin | 8471cec | 2004-10-21 14:02:19 +0000 | [diff] [blame] | 342 | sptr, sizeof(REAL_t), opt_mname, |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 343 | buf_ptr, size, REAL__xer_body_decode); |
| 344 | } |
| 345 | |
Lev Walkin | 725883b | 2006-10-09 12:07:58 +0000 | [diff] [blame] | 346 | asn_dec_rval_t |
| 347 | REAL_decode_uper(asn_codec_ctx_t *opt_codec_ctx, |
| 348 | asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, |
| 349 | void **sptr, asn_per_data_t *pd) { |
| 350 | (void)constraints; /* No PER visible constraints */ |
| 351 | return OCTET_STRING_decode_uper(opt_codec_ctx, td, 0, sptr, pd); |
| 352 | } |
| 353 | |
| 354 | asn_enc_rval_t |
| 355 | REAL_encode_uper(asn_TYPE_descriptor_t *td, |
| 356 | asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) { |
| 357 | (void)constraints; /* No PER visible constraints */ |
| 358 | return OCTET_STRING_encode_uper(td, 0, sptr, po); |
| 359 | } |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 360 | |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 361 | int |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 362 | asn_REAL2double(const REAL_t *st, double *dbl_value) { |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 363 | unsigned int octv; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 364 | |
| 365 | if(!st || !st->buf) { |
| 366 | errno = EINVAL; |
| 367 | return -1; |
| 368 | } |
| 369 | |
| 370 | if(st->size == 0) { |
| 371 | *dbl_value = 0; |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | octv = st->buf[0]; /* unsigned byte */ |
| 376 | |
| 377 | switch(octv & 0xC0) { |
| 378 | case 0x40: /* X.690: 8.5.8 */ |
| 379 | /* "SpecialRealValue" */ |
| 380 | |
| 381 | /* Be liberal in what you accept... |
| 382 | if(st->size != 1) ... |
| 383 | */ |
| 384 | |
| 385 | switch(st->buf[0]) { |
| 386 | case 0x40: /* 01000000: PLUS-INFINITY */ |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 387 | *dbl_value = INFINITY; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 388 | return 0; |
| 389 | case 0x41: /* 01000001: MINUS-INFINITY */ |
Lev Walkin | 1aea698 | 2004-10-26 09:35:25 +0000 | [diff] [blame] | 390 | *dbl_value = - INFINITY; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 391 | return 0; |
| 392 | /* |
| 393 | * The following cases are defined by |
| 394 | * X.690 Amendment 1 (10/03) |
| 395 | */ |
| 396 | case 0x42: /* 01000010: NOT-A-NUMBER */ |
| 397 | *dbl_value = NAN; |
| 398 | return 0; |
| 399 | case 0x43: /* 01000011: minus zero */ |
Lev Walkin | 2a789d9 | 2004-09-27 21:36:59 +0000 | [diff] [blame] | 400 | *dbl_value = -0.0; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | errno = EINVAL; |
| 405 | return -1; |
| 406 | case 0x00: { /* X.690: 8.5.6 */ |
| 407 | /* |
| 408 | * Decimal. NR{1,2,3} format. |
| 409 | */ |
| 410 | double d; |
| 411 | |
| 412 | assert(st->buf[st->size - 1] == 0); /* Security, vashu mat' */ |
| 413 | |
| 414 | d = strtod((char *)st->buf, 0); |
| 415 | if(finite(d)) { |
| 416 | *dbl_value = d; |
| 417 | return 0; |
| 418 | } else { |
| 419 | errno = ERANGE; |
| 420 | return 0; |
| 421 | } |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * Binary representation. |
| 427 | */ |
| 428 | { |
| 429 | double m; |
| 430 | int expval; /* exponent value */ |
| 431 | unsigned int elen; /* exponent value length, in octets */ |
| 432 | unsigned int scaleF; |
| 433 | unsigned int baseF; |
| 434 | uint8_t *ptr; |
| 435 | uint8_t *end; |
| 436 | int sign; |
| 437 | |
| 438 | switch((octv & 0x30) >> 4) { |
| 439 | case 0x00: baseF = 1; break; /* base 2 */ |
| 440 | case 0x01: baseF = 3; break; /* base 8 */ |
| 441 | case 0x02: baseF = 4; break; /* base 16 */ |
| 442 | default: |
| 443 | /* Reserved field, can't parse now. */ |
| 444 | errno = EINVAL; |
| 445 | return -1; |
| 446 | } |
| 447 | |
| 448 | sign = (octv & 0x40); /* bit 7 */ |
| 449 | scaleF = (octv & 0x0C) >> 2; /* bits 4 to 3 */ |
| 450 | |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 451 | if(st->size <= (int)(1 + (octv & 0x03))) { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 452 | errno = EINVAL; |
| 453 | return -1; |
| 454 | } |
| 455 | |
Lev Walkin | e78753d | 2007-06-23 17:02:00 +0000 | [diff] [blame] | 456 | elen = (octv & 0x03); /* bits 2 to 1; 8.5.6.4 */ |
| 457 | if(elen == 0x03) { /* bits 2 to 1 = 11; 8.5.6.4, case d) */ |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 458 | elen = st->buf[1]; /* unsigned binary number */ |
Lev Walkin | a9cc46e | 2004-09-22 16:06:28 +0000 | [diff] [blame] | 459 | if(elen == 0 || st->size <= (int)(2 + elen)) { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 460 | errno = EINVAL; |
| 461 | return -1; |
| 462 | } |
Lev Walkin | e78753d | 2007-06-23 17:02:00 +0000 | [diff] [blame] | 463 | /* FIXME: verify constraints of case d) */ |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 464 | ptr = &st->buf[2]; |
| 465 | } else { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 466 | ptr = &st->buf[1]; |
| 467 | } |
| 468 | |
| 469 | /* Fetch the multibyte exponent */ |
| 470 | expval = (int)(*(int8_t *)ptr); |
| 471 | end = ptr + elen + 1; |
| 472 | for(ptr++; ptr < end; ptr++) |
| 473 | expval = (expval * 256) + *ptr; |
| 474 | |
| 475 | m = 0.0; /* Initial mantissa value */ |
| 476 | |
| 477 | /* Okay, the exponent is here. Now, what about mantissa? */ |
| 478 | end = st->buf + st->size; |
| 479 | if(ptr < end) { |
| 480 | for(; ptr < end; ptr++) |
Lev Walkin | 77aa90f | 2005-04-28 22:56:36 +0000 | [diff] [blame] | 481 | m = ldexp(m, 8) + *ptr; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 482 | } |
| 483 | |
Lev Walkin | 5f56091 | 2004-10-21 13:37:57 +0000 | [diff] [blame] | 484 | if(0) |
Lev Walkin | 77aa90f | 2005-04-28 22:56:36 +0000 | [diff] [blame] | 485 | ASN_DEBUG("m=%.10f, scF=%d, bF=%d, expval=%d, ldexp()=%f, ldexp()=%f", |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 486 | m, scaleF, baseF, expval, |
| 487 | ldexp(m, expval * baseF + scaleF), |
Lev Walkin | 77aa90f | 2005-04-28 22:56:36 +0000 | [diff] [blame] | 488 | ldexp(m, scaleF) * pow(pow(2, baseF), expval) |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 489 | ); |
| 490 | |
| 491 | /* |
| 492 | * (S * N * 2^F) * B^E |
| 493 | * Essentially: |
Lev Walkin | 77aa90f | 2005-04-28 22:56:36 +0000 | [diff] [blame] | 494 | m = ldexp(m, scaleF) * pow(pow(2, base), expval); |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 495 | */ |
| 496 | m = ldexp(m, expval * baseF + scaleF); |
| 497 | if(finite(m)) { |
| 498 | *dbl_value = sign ? -m : m; |
| 499 | } else { |
| 500 | errno = ERANGE; |
| 501 | return -1; |
| 502 | } |
| 503 | |
| 504 | } /* if(binary_format) */ |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Assume IEEE 754 floating point: standard 64 bit double. |
| 511 | * [1 bit sign] [11 bits exponent] [52 bits mantissa] |
| 512 | */ |
| 513 | int |
Lev Walkin | 5e03376 | 2004-09-29 13:26:15 +0000 | [diff] [blame] | 514 | asn_double2REAL(REAL_t *st, double dbl_value) { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 515 | #ifdef WORDS_BIGENDIAN /* Known to be big-endian */ |
| 516 | int littleEndian = 0; |
| 517 | #else /* need to test: have no explicit information */ |
| 518 | unsigned int LE = 1; |
| 519 | int littleEndian = *(unsigned char *)&LE; |
| 520 | #endif |
| 521 | uint8_t buf[16]; /* More than enough for 8-byte dbl_value */ |
| 522 | uint8_t dscr[sizeof(dbl_value)]; /* double value scratch pad */ |
| 523 | /* Assertion guards: won't even compile, if unexpected double size */ |
Lev Walkin | 50b0f6c | 2006-10-16 12:01:36 +0000 | [diff] [blame] | 524 | char assertion_buffer1[9 - sizeof(dbl_value)] GCC_NOTUSED; |
| 525 | char assertion_buffer2[sizeof(dbl_value) - 7] GCC_NOTUSED; |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 526 | uint8_t *ptr = buf; |
| 527 | uint8_t *mstop; /* Last byte of mantissa */ |
| 528 | unsigned int mval; /* Value of the last byte of mantissa */ |
| 529 | unsigned int bmsign; /* binary mask with sign */ |
| 530 | unsigned int buflen; |
| 531 | unsigned int accum; |
| 532 | int expval; |
| 533 | |
| 534 | if(!st) { |
| 535 | errno = EINVAL; |
| 536 | return -1; |
| 537 | } |
| 538 | |
Lev Walkin | 057fb73 | 2004-09-14 13:58:10 +0000 | [diff] [blame] | 539 | /* |
| 540 | * ilogb(+-0) returns -INT_MAX or INT_MIN (platform-dependent) |
Lev Walkin | 2f50502 | 2005-07-01 08:28:18 +0000 | [diff] [blame] | 541 | * ilogb(+-inf) returns INT_MAX, logb(+-inf) returns +inf |
Lev Walkin | 2a789d9 | 2004-09-27 21:36:59 +0000 | [diff] [blame] | 542 | * ilogb(NaN) returns INT_MIN or INT_MAX (platform-dependent) |
Lev Walkin | 057fb73 | 2004-09-14 13:58:10 +0000 | [diff] [blame] | 543 | */ |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 544 | expval = ilogb(dbl_value); |
Lev Walkin | 2a789d9 | 2004-09-27 21:36:59 +0000 | [diff] [blame] | 545 | if(expval <= -INT_MAX /* Also catches +-0 and maybe isnan() */ |
| 546 | || expval == INT_MAX /* catches isfin() and maybe isnan() */ |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 547 | ) { |
| 548 | if(!st->buf || st->size < 2) { |
Lev Walkin | 8e8078a | 2004-09-26 13:10:40 +0000 | [diff] [blame] | 549 | ptr = (uint8_t *)MALLOC(2); |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 550 | if(!ptr) return -1; |
| 551 | st->buf = ptr; |
| 552 | } |
| 553 | /* fpclassify(3) is not portable yet */ |
Lev Walkin | 2a789d9 | 2004-09-27 21:36:59 +0000 | [diff] [blame] | 554 | if(isnan(dbl_value)) { |
| 555 | st->buf[0] = 0x42; /* NaN */ |
| 556 | st->buf[1] = 0; |
| 557 | st->size = 1; |
Lev Walkin | a460ba3 | 2004-10-20 15:40:04 +0000 | [diff] [blame] | 558 | } else if(!finite(dbl_value)) { |
Lev Walkin | 7e03db9 | 2004-09-14 13:50:21 +0000 | [diff] [blame] | 559 | if(copysign(1.0, dbl_value) < 0.0) { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 560 | st->buf[0] = 0x41; /* MINUS-INFINITY */ |
| 561 | } else { |
| 562 | st->buf[0] = 0x40; /* PLUS-INFINITY */ |
| 563 | } |
| 564 | st->buf[1] = 0; |
| 565 | st->size = 1; |
Lev Walkin | c51e7d6 | 2004-09-27 22:16:18 +0000 | [diff] [blame] | 566 | } else { |
| 567 | if(copysign(1.0, dbl_value) < 0.0) { |
| 568 | st->buf[0] = 0x80 | 0x40; |
| 569 | st->buf[1] = 0; |
| 570 | st->size = 2; |
| 571 | } else { |
| 572 | /* no content octets: positive zero */ |
| 573 | st->buf[0] = 0; /* JIC */ |
| 574 | st->size = 0; |
| 575 | } |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 576 | } |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | if(littleEndian) { |
| 581 | uint8_t *s = ((uint8_t *)&dbl_value) + sizeof(dbl_value) - 2; |
Lev Walkin | 057fb73 | 2004-09-14 13:58:10 +0000 | [diff] [blame] | 582 | uint8_t *start = ((uint8_t *)&dbl_value); |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 583 | uint8_t *d; |
| 584 | |
| 585 | bmsign = 0x80 | ((s[1] >> 1) & 0x40); /* binary mask & - */ |
Lev Walkin | 057fb73 | 2004-09-14 13:58:10 +0000 | [diff] [blame] | 586 | for(mstop = d = dscr; s >= start; d++, s--) { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 587 | *d = *s; |
| 588 | if(*d) mstop = d; |
| 589 | } |
| 590 | } else { |
| 591 | uint8_t *s = ((uint8_t *)&dbl_value) + 1; |
| 592 | uint8_t *end = ((uint8_t *)&dbl_value) + sizeof(double); |
| 593 | uint8_t *d; |
| 594 | |
| 595 | bmsign = 0x80 | ((s[-1] >> 1) & 0x40); /* binary mask & - */ |
| 596 | for(mstop = d = dscr; s < end; d++, s++) { |
| 597 | *d = *s; |
| 598 | if(*d) mstop = d; |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | /* Remove parts of the exponent, leave mantissa and explicit 1. */ |
| 603 | dscr[0] = 0x10 | (dscr[0] & 0x0f); |
| 604 | |
| 605 | /* Adjust exponent in a very unobvious way */ |
| 606 | expval -= 8 * ((mstop - dscr) + 1) - 4; |
| 607 | |
| 608 | /* This loop ensures DER conformance by forcing mantissa odd: 11.3.1 */ |
| 609 | mval = *mstop; |
| 610 | if(mval && !(mval & 1)) { |
| 611 | unsigned int shift_count = 1; |
| 612 | unsigned int ishift; |
| 613 | uint8_t *mptr; |
| 614 | |
| 615 | /* |
| 616 | * Figure out what needs to be done to make mantissa odd. |
| 617 | */ |
| 618 | if(!(mval & 0x0f)) /* Speed-up a little */ |
| 619 | shift_count = 4; |
| 620 | while(((mval >> shift_count) & 1) == 0) |
| 621 | shift_count++; |
| 622 | |
| 623 | ishift = 8 - shift_count; |
| 624 | accum = 0; |
| 625 | |
| 626 | /* Go over the buffer, shifting it shift_count bits right. */ |
| 627 | for(mptr = dscr; mptr <= mstop; mptr++) { |
| 628 | mval = *mptr; |
| 629 | *mptr = accum | (mval >> shift_count); |
| 630 | accum = mval << ishift; |
| 631 | } |
| 632 | |
| 633 | /* Adjust mantissa appropriately. */ |
| 634 | expval += shift_count; |
| 635 | } |
| 636 | |
| 637 | if(expval < 0) { |
| 638 | if((expval >> 7) == -1) { |
| 639 | *ptr++ = bmsign | 0x00; |
| 640 | *ptr++ = expval; |
| 641 | } else if((expval >> 15) == -1) { |
| 642 | *ptr++ = bmsign | 0x01; |
| 643 | *ptr++ = expval >> 8; |
| 644 | *ptr++ = expval; |
| 645 | } else { |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 646 | *ptr++ = bmsign | 0x02; |
| 647 | *ptr++ = expval >> 16; |
| 648 | *ptr++ = expval >> 8; |
| 649 | *ptr++ = expval; |
| 650 | } |
| 651 | } else if(expval <= 0x7f) { |
| 652 | *ptr++ = bmsign | 0x00; |
| 653 | *ptr++ = expval; |
| 654 | } else if(expval <= 0x7fff) { |
| 655 | *ptr++ = bmsign | 0x01; |
| 656 | *ptr++ = expval >> 8; |
| 657 | *ptr++ = expval; |
| 658 | } else { |
| 659 | assert(expval <= 0x7fffff); |
| 660 | *ptr++ = bmsign | 0x02; |
| 661 | *ptr++ = expval >> 16; |
| 662 | *ptr++ = expval >> 8; |
| 663 | *ptr++ = expval; |
| 664 | } |
| 665 | |
| 666 | buflen = (mstop - dscr) + 1; |
| 667 | memcpy(ptr, dscr, buflen); |
| 668 | ptr += buflen; |
| 669 | buflen = ptr - buf; |
| 670 | |
Lev Walkin | c17d90f | 2005-01-17 14:32:45 +0000 | [diff] [blame] | 671 | ptr = (uint8_t *)MALLOC(buflen + 1); |
Lev Walkin | 41ba1f2 | 2004-09-14 12:46:35 +0000 | [diff] [blame] | 672 | if(!ptr) return -1; |
| 673 | |
| 674 | memcpy(ptr, buf, buflen); |
| 675 | buf[buflen] = 0; /* JIC */ |
| 676 | |
| 677 | if(st->buf) FREEMEM(st->buf); |
| 678 | st->buf = ptr; |
| 679 | st->size = buflen; |
| 680 | |
| 681 | return 0; |
| 682 | } |