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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 - 2005, 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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