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44d84ac164
could very well cause a negate number get passed in and thus cause reading outside of the array usually used for this purpose. We avoid this by using the uppercase macro versions introduced just now that does some extra crazy typecasts to avoid byte codes > 127 to cause negative int values.
315 lines
8.0 KiB
C
315 lines
8.0 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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/* Base64 encoding/decoding
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*
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* Test harnesses down the bottom - compile with -DTEST_ENCODE for
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* a program that will read in raw data from stdin and write out
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* a base64-encoded version to stdout, and the length returned by the
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* encoding function to stderr. Compile with -DTEST_DECODE for a program that
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* will go the other way.
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*
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* This code will break if int is smaller than 32 bits
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*/
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#include "setup.h"
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#include <stdlib.h>
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#include <string.h>
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "base64.h"
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#include "memory.h"
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/* include memdebug.h last */
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#include "memdebug.h"
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static void decodeQuantum(unsigned char *dest, const char *src)
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{
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unsigned int x = 0;
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int i;
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for(i = 0; i < 4; i++) {
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if(src[i] >= 'A' && src[i] <= 'Z')
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x = (x << 6) + (unsigned int)(src[i] - 'A' + 0);
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else if(src[i] >= 'a' && src[i] <= 'z')
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x = (x << 6) + (unsigned int)(src[i] - 'a' + 26);
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else if(src[i] >= '0' && src[i] <= '9')
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x = (x << 6) + (unsigned int)(src[i] - '0' + 52);
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else if(src[i] == '+')
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x = (x << 6) + 62;
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else if(src[i] == '/')
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x = (x << 6) + 63;
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else if(src[i] == '=')
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x = (x << 6);
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}
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dest[2] = (unsigned char)(x & 255);
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x >>= 8;
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dest[1] = (unsigned char)(x & 255);
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x >>= 8;
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dest[0] = (unsigned char)(x & 255);
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}
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/*
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* Curl_base64_decode()
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*
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* Given a base64 string at src, decode it and return an allocated memory in
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* the *outptr. Returns the length of the decoded data.
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*/
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size_t Curl_base64_decode(const char *src, unsigned char **outptr)
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{
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int length = 0;
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int equalsTerm = 0;
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int i;
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int numQuantums;
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unsigned char lastQuantum[3];
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size_t rawlen=0;
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unsigned char *newstr;
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*outptr = NULL;
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while((src[length] != '=') && src[length])
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length++;
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/* A maximum of two = padding characters is allowed */
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if(src[length] == '=') {
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equalsTerm++;
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if(src[length+equalsTerm] == '=')
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equalsTerm++;
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}
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numQuantums = (length + equalsTerm) / 4;
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/* Don't allocate a buffer if the decoded length is 0 */
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if (numQuantums <= 0)
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return 0;
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rawlen = (numQuantums * 3) - equalsTerm;
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/* The buffer must be large enough to make room for the last quantum
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(which may be partially thrown out) and the zero terminator. */
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newstr = malloc(rawlen+4);
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if(!newstr)
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return 0;
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*outptr = newstr;
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/* Decode all but the last quantum (which may not decode to a
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multiple of 3 bytes) */
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for(i = 0; i < numQuantums - 1; i++) {
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decodeQuantum((unsigned char *)newstr, src);
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newstr += 3; src += 4;
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}
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/* This final decode may actually read slightly past the end of the buffer
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if the input string is missing pad bytes. This will almost always be
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harmless. */
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decodeQuantum(lastQuantum, src);
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for(i = 0; i < 3 - equalsTerm; i++)
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newstr[i] = lastQuantum[i];
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newstr[i] = 0; /* zero terminate */
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return rawlen;
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}
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/* ---- Base64 Encoding --- */
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static const char table64[]=
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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/*
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* Curl_base64_encode()
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*
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* Returns the length of the newly created base64 string. The third argument
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* is a pointer to an allocated area holding the base64 data. If something
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* went wrong, -1 is returned.
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*
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*/
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size_t Curl_base64_encode(const char *inp, size_t insize, char **outptr)
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{
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unsigned char ibuf[3];
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unsigned char obuf[4];
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int i;
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int inputparts;
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char *output;
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char *base64data;
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char *indata = (char *)inp;
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*outptr = NULL; /* set to NULL in case of failure before we reach the end */
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if(0 == insize)
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insize = strlen(indata);
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base64data = output = (char*)malloc(insize*4/3+4);
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if(NULL == output)
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return 0;
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while(insize > 0) {
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for (i = inputparts = 0; i < 3; i++) {
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if(insize > 0) {
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inputparts++;
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ibuf[i] = *indata;
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indata++;
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insize--;
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}
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else
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ibuf[i] = 0;
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}
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obuf[0] = (unsigned char) ((ibuf[0] & 0xFC) >> 2);
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obuf[1] = (unsigned char) (((ibuf[0] & 0x03) << 4) | \
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((ibuf[1] & 0xF0) >> 4));
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obuf[2] = (unsigned char) (((ibuf[1] & 0x0F) << 2) | \
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((ibuf[2] & 0xC0) >> 6));
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obuf[3] = (unsigned char) (ibuf[2] & 0x3F);
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switch(inputparts) {
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case 1: /* only one byte read */
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snprintf(output, 5, "%c%c==",
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table64[obuf[0]],
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table64[obuf[1]]);
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break;
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case 2: /* two bytes read */
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snprintf(output, 5, "%c%c%c=",
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table64[obuf[0]],
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table64[obuf[1]],
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table64[obuf[2]]);
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break;
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default:
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snprintf(output, 5, "%c%c%c%c",
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table64[obuf[0]],
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table64[obuf[1]],
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table64[obuf[2]],
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table64[obuf[3]] );
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break;
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}
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output += 4;
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}
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*output=0;
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*outptr = base64data; /* make it return the actual data memory */
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return strlen(base64data); /* return the length of the new data */
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}
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/* ---- End of Base64 Encoding ---- */
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/************* TEST HARNESS STUFF ****************/
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#ifdef TEST_ENCODE
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/* encoding test harness. Read in standard input and write out the length
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* returned by Curl_base64_encode, followed by the base64'd data itself
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*/
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#include <stdio.h>
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#define TEST_NEED_SUCK
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void *suck(int *);
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int main(int argc, char **argv, char **envp)
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{
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char *base64;
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size_t base64Len;
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unsigned char *data;
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int dataLen;
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data = (unsigned char *)suck(&dataLen);
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base64Len = Curl_base64_encode(data, dataLen, &base64);
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fprintf(stderr, "%d\n", base64Len);
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fprintf(stdout, "%s", base64);
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free(base64); free(data);
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return 0;
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}
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#endif
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#ifdef TEST_DECODE
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/* decoding test harness. Read in a base64 string from stdin and write out the
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* length returned by Curl_base64_decode, followed by the decoded data itself
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*
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* gcc -DTEST_DECODE base64.c -o base64 mprintf.o memdebug.o
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*/
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#include <stdio.h>
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#define TEST_NEED_SUCK
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void *suck(int *);
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int main(int argc, char **argv, char **envp)
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{
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char *base64;
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int base64Len;
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unsigned char *data;
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int dataLen;
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int i, j;
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base64 = (char *)suck(&base64Len);
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data = (unsigned char *)malloc(base64Len * 3/4 + 8);
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dataLen = Curl_base64_decode(base64, data);
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fprintf(stderr, "%d\n", dataLen);
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for(i=0; i < dataLen; i+=0x10) {
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printf("0x%02x: ", i);
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for(j=0; j < 0x10; j++)
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if((j+i) < dataLen)
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printf("%02x ", data[i+j]);
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else
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printf(" ");
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printf(" | ");
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for(j=0; j < 0x10; j++)
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if((j+i) < dataLen)
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printf("%c", ISGRAPH(data[i+j])?data[i+j]:'.');
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else
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break;
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puts("");
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}
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free(base64); free(data);
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return 0;
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}
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#endif
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#ifdef TEST_NEED_SUCK
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/* this function 'sucks' in as much as possible from stdin */
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void *suck(int *lenptr)
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{
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int cursize = 8192;
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unsigned char *buf = NULL;
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int lastread;
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int len = 0;
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do {
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cursize *= 2;
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buf = (unsigned char *)realloc(buf, cursize);
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memset(buf + len, 0, cursize - len);
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lastread = fread(buf + len, 1, cursize - len, stdin);
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len += lastread;
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} while(!feof(stdin));
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lenptr[0] = len;
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return (void *)buf;
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}
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#endif
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