mdw@git.distorted.org.uk Git - mLib/blob - codec/bincode.c

   1 /* -*-c-*-
   2  *
   3  * Common test driver for encoding and decoding
   4  *
   5  * (c) 2009 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 "config.h"
  31
  32 #include <errno.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "codec.h"
  38 #include "dstr.h"
  39 #include "macros.h"
  40 #include "mdwopt.h"
  41 #include "quis.h"
  42 #include "report.h"
  43
  44 #include "base64.h"
  45 #include "base32.h"
  46 #include "hex.h"
  47
  48 /*----- Static variables --------------------------------------------------*/
  49
  50 static const codec_class *cctab[] = {
  51   &base64_class,
  52   &base64url_class,
  53   &file64_class,
  54   &base32_class,
  55   &base32hex_class,
  56   &hex_class,
  57   &null_codec_class,
  58   0,
  59 };
  60
  61 static const struct { const char *name; unsigned f; } flagtab[] = {
  62   { "lowerc",           CDCF_LOWERC },
  63   { "igncase",          CDCF_IGNCASE },
  64   { "noeqpad",          CDCF_NOEQPAD },
  65   { "igneqpad",         CDCF_IGNEQPAD },
  66   { "igneqmid",         CDCF_IGNEQMID },
  67   { "ignzpad",          CDCF_IGNZPAD },
  68   { "ignnewl",          CDCF_IGNNEWL },
  69   { "ignspc",           CDCF_IGNSPC },
  70   { "igninvch",         CDCF_IGNINVCH },
  71   { "ignjunk",          CDCF_IGNJUNK },
  72   { 0,                  0, }
  73 };
  74
  75 /*----- Main code ---------------------------------------------------------*/
  76
  77 static void usage(FILE *fp)
  78 {
  79   pquis(fp,
  80         "Usage: $ [-de] [-f FLAGS] [-i INDENT] [-m MAXLINE] [-o OUTPUT]\n"
  81         "\tCODEC [FILE ...]\n");
  82 }
  83
  84 static void version(FILE *fp)
  85   { pquis(fp, "$, mLib version " VERSION "\n"); }
  86
  87 static void help(FILE *fp)
  88 {
  89   int i;
  90
  91   version(fp);
  92   fputc('\n', fp);
  93   usage(fp);
  94   fputs("\n\
  95 Encodes and decodes binary files.  Options provided:\n\
  96 \n\
  97 -h, --help              Show this help text.\n\
  98 -v, --version           Show the program's version number.\n\
  99 -u, --usage             Show a terse usage message.\n\
 100 \n\
 101 -d, --decode            Decode binary FILEs.\n\
 102 -e, --encode            Encode binary FILEs (default).\n\
 103 -f, --flags=FLAGS       Set encoding/decoding FLAGS.\n\
 104 -i, --indent=INDENT     Indent each line with INDENT.\n\
 105 -m, --maxline=MAXLINE   Limit line length to (about) MAXLINE.\n\
 106 -o, --output=OUTPUT     Write encoded/decoded data to OUTPUT.\n\
 107 \n", fp);
 108 #define ENUM(label, tab, end, getname) do {                             \
 109   fputs(label ":", fp);                                                 \
 110   for (i = 0; tab[i]end; i++) fprintf(fp, " %s", tab[i]getname);        \
 111   fputc('\n', fp);                                                      \
 112 } while (0)
 113   ENUM("Codecs", cctab, != 0, ->name);
 114   ENUM("Flags", flagtab, .name, .name);
 115 #undef ENUM
 116 }
 117
 118 static void code(codec *c, const char *ifile, FILE *ifp, FILE *ofp)
 119 {
 120   dstr d = DSTR_INIT;
 121   char buf[4096];
 122   size_t n;
 123   int err;
 124
 125   do {
 126     n = fread(buf, 1, sizeof(buf), ifp);
 127     DRESET(&d);
 128     if ((err = c->ops->code(c, buf, n, &d)) != 0)
 129       die(EXIT_FAILURE, "decoding error: %s", codec_strerror(err));
 130   } while (fwrite(d.buf, 1, d.len, ofp) == d.len && n == sizeof(buf));
 131   if (ferror(ifp))
 132     die(EXIT_FAILURE, "error reading `%s': %s", ifile, strerror(errno));
 133 }
 134
 135 int main(int argc, char *argv[])
 136 {
 137   enum { encode, decode };
 138   int mode = encode;
 139   const codec_class **cc;
 140   codec *c;
 141   const char *indent = "";
 142   const char *imode, *omode, *ofile = 0;
 143   unsigned maxline = 64;
 144   unsigned f = CDCF_IGNSPC | CDCF_IGNNEWL;
 145   const char *p;
 146   char *q;
 147   FILE *ifp, *ofp = stdout;
 148   dstr d = DSTR_INIT;
 149   int i;
 150   int sense;
 151   size_t n;
 152   int err;
 153
 154 #define f_bogus 32768u
 155
 156   ego(argv[0]);
 157
 158   for (;;) {
 159     static const struct option opts[] = {
 160       { "help",         0,              0,      'h' },
 161       { "version",      0,              0,      'v' },
 162       { "usage",        0,              0,      'u' },
 163       { "encode",       0,              0,      'e' },
 164       { "decode",       0,              0,      'd' },
 165       { "indent",       OPTF_ARGREQ,    0,      'i' },
 166       { "maxline",      OPTF_ARGREQ,    0,      'm' },
 167       { "output",       OPTF_ARGREQ,    0,      'o' },
 168       { "flags",        OPTF_ARGREQ,    0,      'f' },
 169       { 0,              0,              0,      0 }
 170     };
 171
 172     if ((i = mdwopt(argc, argv, "hvu" "edf:i:m:o:", opts, 0, 0, 0)) < 0)
 173       break;
 174     switch (i) {
 175       case 'h': help(stdout); exit(0);
 176       case 'v': version(stdout); exit(0);
 177       case 'u': usage(stdout); exit(0);
 178
 179       case 'e': mode = encode; break;
 180       case 'd': mode = decode; break;
 181       case 'i': indent = optarg; break;
 182       case 'o': ofile = optarg; break;
 183
 184       case 'm':
 185         errno = 0;
 186         maxline = strtoul(optarg, &q, 0);
 187         if (*q || errno) die(EXIT_FAILURE, "bad integer `%s'", optarg);
 188         break;
 189
 190       case 'f':
 191         p = optarg;
 192         while (*p) {
 193           if (*p == '-') { sense = 0; p++; }
 194           else if (*p == '+') { sense = 1; p++; }
 195           else sense = 1;
 196           n = strcspn(p, ",");
 197           for (i = 0; flagtab[i].name; i++) {
 198             if (strlen(flagtab[i].name) == n &&
 199                 STRNCMP(flagtab[i].name, ==, p, n))
 200               goto found;
 201           }
 202           die(EXIT_FAILURE, "unknown flag `%.*s'", (int)n, p);
 203         found:
 204           if (sense) f |= flagtab[i].f;
 205           else f &= ~flagtab[i].f;
 206           p += n;
 207           if (*p == ',') p++;
 208         }
 209         break;
 210
 211       default: f |= f_bogus; break;
 212     }
 213   }
 214   argv += optind; argc -= optind;
 215   if ((f & f_bogus) || !argc) { usage(stderr); exit(EXIT_FAILURE); }
 216
 217   for (cc = cctab;; cc++) {
 218     if (!*cc) die(EXIT_FAILURE, "unknown codec `%s'", *argv);
 219     else if (STRCMP(*argv, ==, (*cc)->name)) break;
 220   }
 221   argv++; argc--;
 222
 223   switch (mode) {
 224     case encode:
 225       DPUTC(&d, '\n');
 226       for (p = indent;; p++) {
 227         switch (*p) {
 228           case '\\':
 229             p++;
 230             switch (*p) {
 231               case 'a': DPUTC(&d, '\n'); break;
 232               case 'b': DPUTC(&d, '\b'); break;
 233               case 'f': DPUTC(&d, '\f'); break;
 234               case 'n': DPUTC(&d, '\n'); break;
 235               case 'r': DPUTC(&d, '\r'); break;
 236               case 't': DPUTC(&d, '\t'); break;
 237               case 'v': DPUTC(&d, '\v'); break;
 238               case 0: goto done_indent; break;
 239               default: DPUTC(&d, *p); break;
 240             }
 241             break;
 242           case 0:
 243             goto done_indent;
 244           default:
 245             DPUTC(&d, *p);
 246             break;
 247         }
 248       }
 249     done_indent:
 250       DPUTZ(&d);
 251       c = (*cc)->encoder(f, d.buf, maxline);
 252       imode = "rb"; omode = "w";
 253       break;
 254     case decode:
 255       c = (*cc)->decoder(f);
 256       imode = "r"; omode = "wb";
 257       break;
 258     default:
 259       abort();
 260   }
 261
 262   if (ofile && (ofp = fopen(ofile, omode)) == 0) {
 263     die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
 264         ofile, strerror(errno));
 265   }
 266
 267   if (mode == encode) fwrite(d.buf + 1, 1, d.len - 1, ofp);
 268   if (!argc)
 269     code(c, "<stdin>", stdin, ofp);
 270   else for (i = 0; i < argc; i++) {
 271     if (STRCMP(argv[i], ==, "-"))
 272       code(c, "<stdin>", stdin, ofp);
 273     else if ((ifp = fopen(argv[i], imode)) == 0) {
 274       die(EXIT_FAILURE, "couldn't open `%s' for reading: %s",
 275           argv[i], strerror(errno));
 276     } else {
 277       code(c, argv[i], ifp, ofp);
 278       fclose(ifp);
 279     }
 280   }
 281   DRESET(&d);
 282   if ((err = c->ops->code(c, 0, 0, &d)) != 0)
 283     die(EXIT_FAILURE, "decoding error: %s", codec_strerror(err));
 284   if (mode == encode) DPUTC(&d, '\n');
 285   fwrite(d.buf, 1, d.len, ofp);
 286   c->ops->destroy(c); DDESTROY(&d);
 287
 288   if (ferror(ofp) || fflush(ofp) || fclose(ofp)) {
 289     die(EXIT_FAILURE, "error writing to `%s': %s",
 290         ofile ? ofile : "<stdout>", strerror(errno));
 291   }
 292   return (0);
 293 }
 294
 295 /*----- That's all, folks -------------------------------------------------*/