| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Binary base-conversion encoding and decoding (base64, base32, etc.) |
| 4 | * |
| 5 | * (c) 1997 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of the mLib utilities library. |
| 11 | * |
| 12 | * mLib is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * mLib is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with mLib; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include <ctype.h> |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "alloc.h" |
| 36 | #include "codec.h" |
| 37 | #include "dstr.h" |
| 38 | #include "sub.h" |
| 39 | |
| 40 | #include "base64.h" |
| 41 | #include "base32.h" |
| 42 | #include "hex.h" |
| 43 | |
| 44 | /*----- Important tables --------------------------------------------------*/ |
| 45 | |
| 46 | /* --- Magic constants --- */ |
| 47 | |
| 48 | #define NV -1 /* Not valid */ |
| 49 | #define PC -2 /* Padding character */ |
| 50 | #define NL -3 /* Newline character */ |
| 51 | |
| 52 | /* --- Base64 --- */ |
| 53 | |
| 54 | static const char |
| 55 | encodemap_base64[] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 56 | "abcdefghijklmnopqrstuvwxyz" |
| 57 | "0123456789+/" }, |
| 58 | encodemap_file64[] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 59 | "abcdefghijklmnopqrstuvwxyz" |
| 60 | "0123456789+%" }, |
| 61 | encodemap_base64url[] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 62 | "abcdefghijklmnopqrstuvwxyz" |
| 63 | "0123456789-_" }; |
| 64 | |
| 65 | static const signed char decodemap_base64[] = { |
| 66 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NL, NV, NV, NL, NV, NV, /* 0x */ |
| 67 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 1x */ |
| 68 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, 62, NV, NV, NV, 63, /* 2x */ |
| 69 | 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, NV, NV, NV, PC, NV, NV, /* 3x */ |
| 70 | NV, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 4x */ |
| 71 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, NV, NV, NV, NV, NV, /* 5x */ |
| 72 | NV, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 ,37, 38, 39, 40, /* 6x */ |
| 73 | 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, NV, NV, NV, NV, NV /* 7x */ |
| 74 | }, decodemap_file64[] = { |
| 75 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NL, NV, NV, NL, NV, NV, /* 0x */ |
| 76 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 1x */ |
| 77 | NV, NV, NV, NV, NV, 63, NV, NV, NV, NV, NV, 62, NV, NV, NV, NV, /* 2x */ |
| 78 | 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, NV, NV, NV, PC, NV, NV, /* 3x */ |
| 79 | NV, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 4x */ |
| 80 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, NV, NV, NV, NV, NV, /* 5x */ |
| 81 | NV, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 ,37, 38, 39, 40, /* 6x */ |
| 82 | 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, NV, NV, NV, NV, NV /* 7x */ |
| 83 | }, decodemap_base64url[] = { |
| 84 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NL, NV, NV, NL, NV, NV, /* 0x */ |
| 85 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 1x */ |
| 86 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, 62, NV, NV, /* 2x */ |
| 87 | 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, NV, NV, NV, PC, NV, NV, /* 3x */ |
| 88 | NV, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 4x */ |
| 89 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, NV, NV, NV, NV, 63, /* 5x */ |
| 90 | NV, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 ,37, 38, 39, 40, /* 6x */ |
| 91 | 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, NV, NV, NV, NV, NV /* 7x */ |
| 92 | }; |
| 93 | |
| 94 | /* --- Base32 --- */ |
| 95 | |
| 96 | static const char |
| 97 | encodemap_base32[] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567" }, |
| 98 | encodemap_base32hex[] = { "0123456789ABCDEFGHIJKLMNOPQRSTUV" }; |
| 99 | |
| 100 | static const signed char decodemap_base32[] = { |
| 101 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NL, NV, NV, NL, NV, NV, /* 0x */ |
| 102 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 1x */ |
| 103 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 2x */ |
| 104 | NV, NV, 26, 27, 28, 29, 30, 31, NV, NV, NV, NV, NV, PC, NV, NV, /* 3x */ |
| 105 | NV, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 4x */ |
| 106 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, NV, NV, NV, NV, NV, /* 5x */ |
| 107 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 6x */ |
| 108 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 7x */ |
| 109 | }, decodemap_base32hex[] = { |
| 110 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NL, NV, NV, NL, NV, NV, /* 0x */ |
| 111 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 1x */ |
| 112 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 2x */ |
| 113 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, NV, NV, NV, PC, NV, NV, /* 3x */ |
| 114 | NV, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, /* 4x */ |
| 115 | 25, 26, 27, 28, 29, 30, 31, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 5x */ |
| 116 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 6x */ |
| 117 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 7x */ |
| 118 | }; |
| 119 | |
| 120 | /* --- Hex --- */ |
| 121 | |
| 122 | static const char |
| 123 | encodemap_hex[] = { "0123456789ABCDEF" }; |
| 124 | |
| 125 | static const signed char decodemap_hex[] = { |
| 126 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NL, NV, NV, NL, NV, NV, /* 0x */ |
| 127 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 1x */ |
| 128 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 2x */ |
| 129 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, NV, NV, NV, NV, NV, NV, /* 3x */ |
| 130 | NV, 10, 11, 12, 13, 14, 15, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 4x */ |
| 131 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 5x */ |
| 132 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 6x */ |
| 133 | NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, NV, /* 7x */ |
| 134 | }; |
| 135 | |
| 136 | /*----- Base conversion macros --------------------------------------------*/ |
| 137 | |
| 138 | /* --- @BASECONV@ --- * |
| 139 | * |
| 140 | * Arguments: @x@ = an input digit of width @IWD@ bits |
| 141 | * @iwd@ = input digit width in bits |
| 142 | * @owd@ = output digit width in bits |
| 143 | * @put@ = function or macro to output a digit |
| 144 | * |
| 145 | * Use: Inserts the bits of @x@ into an accumulator. As digits @y@ |
| 146 | * of with @owd@ become ready, @put(y)@ is invoked to emit them. |
| 147 | */ |
| 148 | |
| 149 | #define BASECONV(x, iwd, owd, put) do { \ |
| 150 | a = (a << iwd) | x; \ |
| 151 | nb += iwd; \ |
| 152 | while (nb >= owd) { \ |
| 153 | nb -= owd; \ |
| 154 | put((a >> nb) & ((1 << owd) - 1)); \ |
| 155 | } \ |
| 156 | } while (0) |
| 157 | |
| 158 | /* --- @BASECONV_FLUSH@ --- * |
| 159 | * |
| 160 | * Arguments: @iwd@ = input digit width in bits |
| 161 | * @owd@ = output digit width in bits |
| 162 | * @put@ = function or macro to output a digit |
| 163 | * |
| 164 | * Use: Flushes remaining digits from the base-conversion shift |
| 165 | * register. The bits in the shift register are padded on the |
| 166 | * right with zeros. Digits of width @owd@ are emitted by |
| 167 | * invoking @put@. |
| 168 | */ |
| 169 | |
| 170 | #define BASECONV_FLUSH(iwd, owd, put) do { \ |
| 171 | if (nb) { \ |
| 172 | while (nb < owd) { a <<= iwd; nb += iwd; } \ |
| 173 | nb -= owd; \ |
| 174 | put((a >> nb) & ((1 << owd) - 1)); \ |
| 175 | } \ |
| 176 | } while (0) |
| 177 | |
| 178 | /* --- @BASECONV_PAD@ --- * |
| 179 | * |
| 180 | * Arguments: @iwd@ = input digit width in bits |
| 181 | * @owd@ = output digit width in bits |
| 182 | * @pad@ = function or macro to output padding |
| 183 | * |
| 184 | * Use: Invokes @pad@ sufficiently often to realign the shift |
| 185 | * register. |
| 186 | */ |
| 187 | |
| 188 | #define BASECONV_PAD(iwd, owd, pad) do { \ |
| 189 | for (;;) { \ |
| 190 | while (nb >= owd) { pad; nb -= owd; } \ |
| 191 | if (!nb) break; \ |
| 192 | nb += iwd; \ |
| 193 | } \ |
| 194 | } while (0) |
| 195 | |
| 196 | #define NULL_PAD(iwd, owd, pad) do ; while (0) |
| 197 | |
| 198 | /*----- Lists of things to make -------------------------------------------*/ |
| 199 | |
| 200 | #define CODECS(_) \ |
| 201 | /* NAME, CTXN, ACC */ \ |
| 202 | _(base64, base64, acc) \ |
| 203 | _(file64, base64, acc) \ |
| 204 | _(base64url, base64, acc) \ |
| 205 | _(base32, base32, accl) \ |
| 206 | _(base32hex, base32, accl) \ |
| 207 | _(hex, hex, acc) |
| 208 | |
| 209 | #define CTXS(_) \ |
| 210 | /* CTXN, WD, ACC */ \ |
| 211 | _(base64, 6, acc) \ |
| 212 | _(base32, 5, accl) \ |
| 213 | _(hex, 4, acc) |
| 214 | |
| 215 | #define base64_PADDING BASECONV_PAD |
| 216 | #define base64_FLAGMASK ~(CDCF_LOWERC | CDCF_IGNCASE) |
| 217 | #define base64_FLAGXOR 0 |
| 218 | #define base64_OLDFLAGS CDCF_IGNJUNK |
| 219 | |
| 220 | #define base32_PADDING BASECONV_PAD |
| 221 | #define base32_FLAGMASK ~0 |
| 222 | #define base32_FLAGXOR 0 |
| 223 | #define base32_OLDFLAGS CDCF_IGNJUNK |
| 224 | |
| 225 | #define hex_PADDING NULL_PAD |
| 226 | #define hex_FLAGMASK ~0 |
| 227 | #define hex_FLAGXOR 0 |
| 228 | #define hex_OLDFLAGS (CDCF_IGNJUNK | CDCF_LOWERC) |
| 229 | |
| 230 | /*----- Data structures ---------------------------------------------------*/ |
| 231 | |
| 232 | #define OBJ(ctxn, wd, acc) \ |
| 233 | \ |
| 234 | typedef struct ctxn##_codec { \ |
| 235 | codec c; \ |
| 236 | ctxn##_ctx ctx; \ |
| 237 | const char *encodemap; \ |
| 238 | const signed char *decodemap; \ |
| 239 | } ctxn##_codec; |
| 240 | |
| 241 | CTXS(OBJ) |
| 242 | |
| 243 | /*----- State packing -----------------------------------------------------* |
| 244 | * |
| 245 | * These macros convert between the state required by the new encoding and |
| 246 | * decoding core and the old externally-visible context structures. It's |
| 247 | * unpleasant, I know; maybe we can drop the old interface later. |
| 248 | */ |
| 249 | |
| 250 | enum { |
| 251 | ST_MAIN, /* Main decoding state */ |
| 252 | ST_PAD, /* Decoding trailing padding */ |
| 253 | ST_END /* Finished decoding */ |
| 254 | }; |
| 255 | |
| 256 | #define STATE_UNPACK(acc) \ |
| 257 | unsigned long a = (ctx->acc >> 0) & 0xffff; \ |
| 258 | unsigned nb = (ctx->acc >> 16) & 0xff; \ |
| 259 | unsigned st = (ctx->acc >> 24) & 0xff; \ |
| 260 | unsigned f = ctx->qsz; |
| 261 | |
| 262 | #define STATE_PACK(acc) do { \ |
| 263 | ctx->acc = (((a & 0xffff) << 0) | \ |
| 264 | (((unsigned long)nb & 0xff) << 16) | \ |
| 265 | (((unsigned long)st & 0xff) << 24)); \ |
| 266 | } while (0) |
| 267 | |
| 268 | /*----- Main encoder and decoder ------------------------------------------*/ |
| 269 | |
| 270 | #define WRAP(stuff) do { \ |
| 271 | if (maxln && lnlen >= maxln) { \ |
| 272 | dstr_puts(d, ctx->indent); \ |
| 273 | lnlen = 0; \ |
| 274 | } \ |
| 275 | stuff \ |
| 276 | lnlen++; \ |
| 277 | } while (0) |
| 278 | |
| 279 | #define PUTWRAP(x) WRAP({ \ |
| 280 | char ch = encodemap[x]; \ |
| 281 | if (f & CDCF_LOWERC) ch = tolower((unsigned char)ch); \ |
| 282 | DPUTC(d, ch); \ |
| 283 | }) |
| 284 | |
| 285 | #define PADWRAP WRAP({ DPUTC(d, '='); }) |
| 286 | |
| 287 | #define PUTRAW(x) DPUTC(d, x) |
| 288 | |
| 289 | #define ENCODER(ctxn, wd, acc) \ |
| 290 | \ |
| 291 | /* --- @CTXN_doencode@ --- * \ |
| 292 | * \ |
| 293 | * Arguments: @CTXN_ctx *ctx@ = pointer to a context block \ |
| 294 | * @const char *encodemap@ = pointer to encoding map \ |
| 295 | * @const unsigned char *p@ = pointer to a source buffer \ |
| 296 | * @size_t sz@ = size of the source buffer \ |
| 297 | * @dstr *d@ = pointer to destination string \ |
| 298 | * \ |
| 299 | * Returns: Zero on success, or @CDCERR_@ error code. \ |
| 300 | * \ |
| 301 | * Use: Main encoder function. \ |
| 302 | */ \ |
| 303 | \ |
| 304 | static int ctxn##_doencode(ctxn##_ctx *ctx, const char *encodemap, \ |
| 305 | const unsigned char *p, size_t sz, dstr *d) \ |
| 306 | { \ |
| 307 | STATE_UNPACK(acc); \ |
| 308 | const unsigned char *l = p + sz; \ |
| 309 | unsigned lnlen = ctx->lnlen, maxln = ctx->maxline; \ |
| 310 | \ |
| 311 | if (p) { \ |
| 312 | while (p < l) BASECONV(*p++, 8, wd, PUTWRAP); \ |
| 313 | } else { \ |
| 314 | BASECONV_FLUSH(8, wd, PUTWRAP); \ |
| 315 | if (!(f & CDCF_NOEQPAD)) ctxn##_PADDING(8, wd, PADWRAP); \ |
| 316 | } \ |
| 317 | \ |
| 318 | STATE_PACK(acc); \ |
| 319 | ctx->lnlen = lnlen; \ |
| 320 | return (0); \ |
| 321 | } \ |
| 322 | \ |
| 323 | /* --- @CTXN_dodecode@ --- * \ |
| 324 | * \ |
| 325 | * Arguments: @CTXN_ctx *ctx@ = pointer to a context block \ |
| 326 | * @const signed char *decodemap@ = pointer to decode map \ |
| 327 | * @const char *p@ = pointer to a source buffer \ |
| 328 | * @size_t sz@ = size of the source buffer \ |
| 329 | * @dstr *d@ = pointer to destination string \ |
| 330 | * \ |
| 331 | * Returns: Zero on success, or @CDCERR_@ error code. \ |
| 332 | * \ |
| 333 | * Use: Main decoder function. \ |
| 334 | */ \ |
| 335 | \ |
| 336 | static int ctxn##_dodecode(ctxn##_ctx *ctx, \ |
| 337 | const signed char *decodemap, \ |
| 338 | const unsigned char *p, size_t sz, dstr *d) \ |
| 339 | { \ |
| 340 | STATE_UNPACK(acc); \ |
| 341 | const unsigned char *l = p + sz; \ |
| 342 | int ch; \ |
| 343 | int x; \ |
| 344 | \ |
| 345 | if (p) { \ |
| 346 | while (p < l) { \ |
| 347 | ch = *p++; \ |
| 348 | switch (f & (CDCF_LOWERC | CDCF_IGNCASE)) { \ |
| 349 | case 0: \ |
| 350 | break; \ |
| 351 | case CDCF_LOWERC: \ |
| 352 | if (isupper(ch)) goto badch; \ |
| 353 | default: \ |
| 354 | ch = toupper(ch); \ |
| 355 | } \ |
| 356 | x = decodemap[ch]; \ |
| 357 | switch (x) { \ |
| 358 | case NV: \ |
| 359 | badch: \ |
| 360 | if (!(f & CDCF_IGNINVCH)) return (CDCERR_INVCH); \ |
| 361 | break; \ |
| 362 | case PC: \ |
| 363 | if (f & CDCF_IGNEQMID) break; \ |
| 364 | if (f & CDCF_NOEQPAD) goto badch; \ |
| 365 | if (st == ST_MAIN && \ |
| 366 | !(f & CDCF_IGNZPAD) && (a & ((1 << nb) - 1))) \ |
| 367 | return (CDCERR_INVZPAD); \ |
| 368 | st = ST_PAD; \ |
| 369 | if (!(f & CDCF_IGNEQPAD)) { \ |
| 370 | if (!nb) return (CDCERR_INVEQPAD); \ |
| 371 | nb = (nb + wd)%8; \ |
| 372 | st = ST_PAD; \ |
| 373 | } \ |
| 374 | break; \ |
| 375 | case NL: \ |
| 376 | if (f & CDCF_IGNNEWL) break; \ |
| 377 | return (CDCERR_INVCH); \ |
| 378 | default: \ |
| 379 | if (st != ST_MAIN) \ |
| 380 | return (CDCERR_INVEQPAD); \ |
| 381 | BASECONV(x, wd, 8, PUTRAW); \ |
| 382 | break; \ |
| 383 | } \ |
| 384 | } \ |
| 385 | } else { \ |
| 386 | if (st == ST_MAIN && \ |
| 387 | !(f & CDCF_IGNZPAD) && (a & ((1 << nb) - 1))) \ |
| 388 | return (CDCERR_INVZPAD); \ |
| 389 | if (!(f & (CDCF_IGNEQPAD | CDCF_IGNEQMID | CDCF_NOEQPAD)) && nb) \ |
| 390 | return (CDCERR_INVEQPAD); \ |
| 391 | } \ |
| 392 | \ |
| 393 | STATE_PACK(acc); \ |
| 394 | return (0); \ |
| 395 | } |
| 396 | |
| 397 | CTXS(ENCODER) |
| 398 | |
| 399 | /*----- Codec implementation ----------------------------------------------*/ |
| 400 | |
| 401 | #define OPS(ctxn, wd, acc) \ |
| 402 | \ |
| 403 | static int ctxn##_enc(codec *c, const void *p, size_t sz, dstr *d) \ |
| 404 | { \ |
| 405 | ctxn##_codec *bc = (ctxn##_codec *)c; \ |
| 406 | return (ctxn##_doencode(&bc->ctx, bc->encodemap, p, sz, d)); \ |
| 407 | } \ |
| 408 | \ |
| 409 | static int ctxn##_dec(codec *c, const void *p, size_t sz, dstr *d) \ |
| 410 | { \ |
| 411 | ctxn##_codec *bc = (ctxn##_codec *)c; \ |
| 412 | return (ctxn##_dodecode(&bc->ctx, bc->decodemap, p, sz, d)); \ |
| 413 | } \ |
| 414 | \ |
| 415 | static void ctxn##_destroy(codec *c) \ |
| 416 | { \ |
| 417 | ctxn##_codec *bc = (ctxn##_codec *)c; \ |
| 418 | if (bc->ctx.indent) xfree((/*unconst*/ char *)bc->ctx.indent); \ |
| 419 | DESTROY(bc); \ |
| 420 | } \ |
| 421 | \ |
| 422 | static codec *ctxn##_docreate(unsigned flags, \ |
| 423 | const char *indent, unsigned maxline, \ |
| 424 | const codec_ops *ops, \ |
| 425 | const char *encodemap, \ |
| 426 | const signed char *decodemap) \ |
| 427 | { \ |
| 428 | ctxn##_codec *bc = CREATE(ctxn##_codec); \ |
| 429 | bc->c.ops = ops; \ |
| 430 | bc->ctx.acc = 0; \ |
| 431 | bc->ctx.qsz = (flags & ctxn##_FLAGMASK) ^ ctxn##_FLAGXOR; \ |
| 432 | bc->ctx.lnlen = 0; \ |
| 433 | bc->ctx.indent = indent ? xstrdup(indent) : 0; \ |
| 434 | bc->ctx.maxline = maxline; \ |
| 435 | bc->encodemap = encodemap; \ |
| 436 | bc->decodemap = decodemap; \ |
| 437 | return (&bc->c); \ |
| 438 | } |
| 439 | |
| 440 | CTXS(OPS) |
| 441 | |
| 442 | #define CLASS(name, ctxn, acc) \ |
| 443 | \ |
| 444 | static const codec_ops \ |
| 445 | name##_encode_ops = { &name##_class, ctxn##_enc, ctxn##_destroy }, \ |
| 446 | name##_decode_ops = { &name##_class, ctxn##_dec, ctxn##_destroy }; \ |
| 447 | \ |
| 448 | static codec *name##_encoder(unsigned flags, \ |
| 449 | const char *indent, unsigned maxline) \ |
| 450 | { \ |
| 451 | return ctxn##_docreate(flags, indent, maxline, \ |
| 452 | &name##_encode_ops, \ |
| 453 | encodemap_##name, \ |
| 454 | decodemap_##name); \ |
| 455 | } \ |
| 456 | \ |
| 457 | static codec *name##_decoder(unsigned flags) \ |
| 458 | { \ |
| 459 | return ctxn##_docreate(flags, 0, 0, \ |
| 460 | &name##_decode_ops, \ |
| 461 | encodemap_##name, \ |
| 462 | decodemap_##name); \ |
| 463 | } \ |
| 464 | \ |
| 465 | const codec_class name##_class = \ |
| 466 | { #name, name##_encoder, name##_decoder }; |
| 467 | |
| 468 | CODECS(CLASS) |
| 469 | |
| 470 | /*----- Compatibility veneers ---------------------------------------------*/ |
| 471 | |
| 472 | #define COMPAT(ctxn, wd, acc) \ |
| 473 | \ |
| 474 | void ctxn##_encode(ctxn##_ctx *ctx, const void *p, size_t sz, dstr *d) \ |
| 475 | { ctxn##_doencode(ctx, encodemap_##ctxn, p, sz, d); } \ |
| 476 | \ |
| 477 | void ctxn##_decode(ctxn##_ctx *ctx, const void *p, size_t sz, dstr *d) \ |
| 478 | { ctxn##_dodecode(ctx, decodemap_##ctxn, p, sz, d); } \ |
| 479 | \ |
| 480 | void ctxn##_init(ctxn##_ctx *ctx) \ |
| 481 | { \ |
| 482 | ctx->acc = 0; \ |
| 483 | ctx->qsz = (ctxn##_OLDFLAGS & ctxn##_FLAGMASK) ^ ctxn##_FLAGXOR; \ |
| 484 | ctx->lnlen = 0; \ |
| 485 | ctx->indent = "\n"; \ |
| 486 | ctx->maxline = 72; \ |
| 487 | } |
| 488 | |
| 489 | CTXS(COMPAT) |
| 490 | |
| 491 | /*----- That's all, folks -------------------------------------------------*/ |