CMakeLua/Utilities/cmcurl-7.19.0/lib/base64.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  * $Id: base64.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
  22  ***************************************************************************/
  23
  24 /* Base64 encoding/decoding
  25  *
  26  * Test harnesses down the bottom - compile with -DTEST_ENCODE for
  27  * a program that will read in raw data from stdin and write out
  28  * a base64-encoded version to stdout, and the length returned by the
  29  * encoding function to stderr. Compile with -DTEST_DECODE for a program that
  30  * will go the other way.
  31  *
  32  * This code will break if int is smaller than 32 bits
  33  */
  34
  35 #include "setup.h"
  36
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #define _MPRINTF_REPLACE /* use our functions only */
  41 #include <curl/mprintf.h>
  42
  43 #include "urldata.h" /* for the SessionHandle definition */
  44 #include "easyif.h"  /* for Curl_convert_... prototypes */
  45 #include "curl_base64.h"
  46 #include "memory.h"
  47
  48 /* include memdebug.h last */
  49 #include "memdebug.h"
  50
  51 /* ---- Base64 Encoding/Decoding Table --- */
  52 static const char table64[]=
  53   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  54
  55 static void decodeQuantum(unsigned char *dest, const char *src)
  56 {
  57   unsigned int x = 0;
  58   int i;
  59   char *found;
  60
  61   for(i = 0; i < 4; i++) {
  62     if((found = strchr(table64, src[i])) != NULL)
  63       x = (x << 6) + (unsigned int)(found - table64);
  64     else if(src[i] == '=')
  65       x = (x << 6);
  66   }
  67
  68   dest[2] = (unsigned char)(x & 255);
  69   x >>= 8;
  70   dest[1] = (unsigned char)(x & 255);
  71   x >>= 8;
  72   dest[0] = (unsigned char)(x & 255);
  73 }
  74
  75 /*
  76  * Curl_base64_decode()
  77  *
  78  * Given a base64 string at src, decode it and return an allocated memory in
  79  * the *outptr. Returns the length of the decoded data.
  80  */
  81 size_t Curl_base64_decode(const char *src, unsigned char **outptr)
  82 {
  83   int length = 0;
  84   int equalsTerm = 0;
  85   int i;
  86   int numQuantums;
  87   unsigned char lastQuantum[3];
  88   size_t rawlen=0;
  89   unsigned char *newstr;
  90
  91   *outptr = NULL;
  92
  93   while((src[length] != '=') && src[length])
  94     length++;
  95   /* A maximum of two = padding characters is allowed */
  96   if(src[length] == '=') {
  97     equalsTerm++;
  98     if(src[length+equalsTerm] == '=')
  99       equalsTerm++;
 100   }
 101   numQuantums = (length + equalsTerm) / 4;
 102
 103   /* Don't allocate a buffer if the decoded length is 0 */
 104   if(numQuantums <= 0)
 105     return 0;
 106
 107   rawlen = (numQuantums * 3) - equalsTerm;
 108
 109   /* The buffer must be large enough to make room for the last quantum
 110   (which may be partially thrown out) and the zero terminator. */
 111   newstr = malloc(rawlen+4);
 112   if(!newstr)
 113     return 0;
 114
 115   *outptr = newstr;
 116
 117   /* Decode all but the last quantum (which may not decode to a
 118   multiple of 3 bytes) */
 119   for(i = 0; i < numQuantums - 1; i++) {
 120     decodeQuantum((unsigned char *)newstr, src);
 121     newstr += 3; src += 4;
 122   }
 123
 124   /* This final decode may actually read slightly past the end of the buffer
 125   if the input string is missing pad bytes.  This will almost always be
 126   harmless. */
 127   decodeQuantum(lastQuantum, src);
 128   for(i = 0; i < 3 - equalsTerm; i++)
 129     newstr[i] = lastQuantum[i];
 130
 131   newstr[i] = 0; /* zero terminate */
 132   return rawlen;
 133 }
 134
 135 /*
 136  * Curl_base64_encode()
 137  *
 138  * Returns the length of the newly created base64 string. The third argument
 139  * is a pointer to an allocated area holding the base64 data. If something
 140  * went wrong, 0 is returned.
 141  *
 142  */
 143 size_t Curl_base64_encode(struct SessionHandle *data,
 144                           const char *inp, size_t insize, char **outptr)
 145 {
 146   unsigned char ibuf[3];
 147   unsigned char obuf[4];
 148   int i;
 149   int inputparts;
 150   char *output;
 151   char *base64data;
 152 #ifdef CURL_DOES_CONVERSIONS
 153   char *convbuf = NULL;
 154 #endif
 155
 156   char *indata = (char *)inp;
 157
 158   *outptr = NULL; /* set to NULL in case of failure before we reach the end */
 159
 160   if(0 == insize)
 161     insize = strlen(indata);
 162
 163   base64data = output = (char*)malloc(insize*4/3+4);
 164   if(NULL == output)
 165     return 0;
 166
 167 #ifdef CURL_DOES_CONVERSIONS
 168   /*
 169    * The base64 data needs to be created using the network encoding
 170    * not the host encoding.  And we can't change the actual input
 171    * so we copy it to a buffer, translate it, and use that instead.
 172    */
 173   if(data) {
 174     convbuf = (char*)malloc(insize);
 175     if(!convbuf) {
 176       free(output);
 177       return 0;
 178     }
 179     memcpy(convbuf, indata, insize);
 180     if(CURLE_OK != Curl_convert_to_network(data, convbuf, insize)) {
 181       free(convbuf);
 182       free(output);
 183       return 0;
 184     }
 185     indata = convbuf; /* switch to the converted buffer */
 186   }
 187 #else
 188   (void)data;
 189 #endif
 190
 191   while(insize > 0) {
 192     for (i = inputparts = 0; i < 3; i++) {
 193       if(insize > 0) {
 194         inputparts++;
 195         ibuf[i] = *indata;
 196         indata++;
 197         insize--;
 198       }
 199       else
 200         ibuf[i] = 0;
 201     }
 202
 203     obuf[0] = (unsigned char)  ((ibuf[0] & 0xFC) >> 2);
 204     obuf[1] = (unsigned char) (((ibuf[0] & 0x03) << 4) | \
 205                                ((ibuf[1] & 0xF0) >> 4));
 206     obuf[2] = (unsigned char) (((ibuf[1] & 0x0F) << 2) | \
 207                                ((ibuf[2] & 0xC0) >> 6));
 208     obuf[3] = (unsigned char)   (ibuf[2] & 0x3F);
 209
 210     switch(inputparts) {
 211     case 1: /* only one byte read */
 212       snprintf(output, 5, "%c%c==",
 213                table64[obuf[0]],
 214                table64[obuf[1]]);
 215       break;
 216     case 2: /* two bytes read */
 217       snprintf(output, 5, "%c%c%c=",
 218                table64[obuf[0]],
 219                table64[obuf[1]],
 220                table64[obuf[2]]);
 221       break;
 222     default:
 223       snprintf(output, 5, "%c%c%c%c",
 224                table64[obuf[0]],
 225                table64[obuf[1]],
 226                table64[obuf[2]],
 227                table64[obuf[3]] );
 228       break;
 229     }
 230     output += 4;
 231   }
 232   *output=0;
 233   *outptr = base64data; /* make it return the actual data memory */
 234
 235 #ifdef CURL_DOES_CONVERSIONS
 236   if(data)
 237     free(convbuf);
 238 #endif
 239   return strlen(base64data); /* return the length of the new data */
 240 }
 241 /* ---- End of Base64 Encoding ---- */
 242
 243 /************* TEST HARNESS STUFF ****************/
 244
 245
 246 #ifdef TEST_ENCODE
 247 /* encoding test harness. Read in standard input and write out the length
 248  * returned by Curl_base64_encode, followed by the base64'd data itself
 249  */
 250 #include <stdio.h>
 251
 252 #define TEST_NEED_SUCK
 253 void *suck(int *);
 254
 255 int main(int argc, argv_item_t argv[], char **envp)
 256 {
 257   char *base64;
 258   size_t base64Len;
 259   unsigned char *data;
 260   int dataLen;
 261   struct SessionHandle *handle = NULL;
 262
 263 #ifdef CURL_DOES_CONVERSIONS
 264   /* get a Curl handle so Curl_base64_encode can translate properly */
 265   handle = curl_easy_init();
 266   if(handle == NULL) {
 267     fprintf(stderr, "Error: curl_easy_init failed\n");
 268     return 1;
 269   }
 270 #endif
 271   data = (unsigned char *)suck(&dataLen);
 272   base64Len = Curl_base64_encode(handle, data, dataLen, &base64);
 273
 274   fprintf(stderr, "%d\n", base64Len);
 275   fprintf(stdout, "%s\n", base64);
 276
 277   free(base64); free(data);
 278 #ifdef CURL_DOES_CONVERSIONS
 279   curl_easy_cleanup(handle);
 280 #endif
 281   return 0;
 282 }
 283 #endif
 284
 285 #ifdef TEST_DECODE
 286 /* decoding test harness. Read in a base64 string from stdin and write out the
 287  * length returned by Curl_base64_decode, followed by the decoded data itself
 288  *
 289  * gcc -DTEST_DECODE base64.c -o base64 mprintf.o memdebug.o
 290  */
 291 #include <stdio.h>
 292
 293 #define TEST_NEED_SUCK
 294 void *suck(int *);
 295
 296 int main(int argc, argv_item_t argv[], char **envp)
 297 {
 298   char *base64;
 299   int base64Len;
 300   unsigned char *data;
 301   int dataLen;
 302   int i, j;
 303 #ifdef CURL_DOES_CONVERSIONS
 304   /* get a Curl handle so main can translate properly */
 305   struct SessionHandle *handle = curl_easy_init();
 306   if(handle == NULL) {
 307     fprintf(stderr, "Error: curl_easy_init failed\n");
 308     return 1;
 309   }
 310 #endif
 311
 312   base64 = (char *)suck(&base64Len);
 313   dataLen = Curl_base64_decode(base64, &data);
 314
 315   fprintf(stderr, "%d\n", dataLen);
 316
 317   for(i=0; i < dataLen; i+=0x10) {
 318     printf("0x%02x: ", i);
 319     for(j=0; j < 0x10; j++)
 320       if((j+i) < dataLen)
 321         printf("%02x ", data[i+j]);
 322       else
 323         printf("   ");
 324
 325     printf(" | ");
 326
 327     for(j=0; j < 0x10; j++)
 328       if((j+i) < dataLen) {
 329 #ifdef CURL_DOES_CONVERSIONS
 330         if(CURLE_OK !=
 331              Curl_convert_from_network(handle, &data[i+j], (size_t)1))
 332           data[i+j] = '.';
 333 #endif /* CURL_DOES_CONVERSIONS */
 334         printf("%c", ISGRAPH(data[i+j])?data[i+j]:'.');
 335       } else
 336         break;
 337     puts("");
 338   }
 339
 340 #ifdef CURL_DOES_CONVERSIONS
 341   curl_easy_cleanup(handle);
 342 #endif
 343   free(base64); free(data);
 344   return 0;
 345 }
 346 #endif
 347
 348 #ifdef TEST_NEED_SUCK
 349 /* this function 'sucks' in as much as possible from stdin */
 350 void *suck(int *lenptr)
 351 {
 352   int cursize = 8192;
 353   unsigned char *buf = NULL;
 354   int lastread;
 355   int len = 0;
 356
 357   do {
 358     cursize *= 2;
 359     buf = (unsigned char *)realloc(buf, cursize);
 360     memset(buf + len, 0, cursize - len);
 361     lastread = fread(buf + len, 1, cursize - len, stdin);
 362     len += lastread;
 363   } while(!feof(stdin));
 364
 365   lenptr[0] = len;
 366   return (void *)buf;
 367 }
 368 #endif