Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

369 lines (318 sloc) 9.644 kb
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
/* Base64 encoding/decoding
*
* Test harnesses down the bottom - compile with -DTEST_ENCODE for
* a program that will read in raw data from stdin and write out
* a base64-encoded version to stdout, and the length returned by the
* encoding function to stderr. Compile with -DTEST_DECODE for a program that
* will go the other way.
*
* This code will break if int is smaller than 32 bits
*/
#include "setup.h"
#include <stdlib.h>
#include <string.h>
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "urldata.h" /* for the SessionHandle definition */
#include "easyif.h" /* for Curl_convert_... prototypes */
#include "base64.h"
#include "memory.h"
/* include memdebug.h last */
#include "memdebug.h"
/* ---- Base64 Encoding/Decoding Table --- */
static const char table64[]=
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static void decodeQuantum(unsigned char *dest, const char *src)
{
unsigned int x = 0;
int i;
char *found;
for(i = 0; i < 4; i++) {
if((found = strchr(table64, src[i])) != NULL)
x = (x << 6) + (unsigned int)(found - table64);
else if(src[i] == '=')
x = (x << 6);
}
dest[2] = (unsigned char)(x & 255);
x >>= 8;
dest[1] = (unsigned char)(x & 255);
x >>= 8;
dest[0] = (unsigned char)(x & 255);
}
/*
* Curl_base64_decode()
*
* Given a base64 string at src, decode it and return an allocated memory in
* the *outptr. Returns the length of the decoded data.
*/
size_t Curl_base64_decode(const char *src, unsigned char **outptr)
{
int length = 0;
int equalsTerm = 0;
int i;
int numQuantums;
unsigned char lastQuantum[3];
size_t rawlen=0;
unsigned char *newstr;
*outptr = NULL;
while((src[length] != '=') && src[length])
length++;
/* A maximum of two = padding characters is allowed */
if(src[length] == '=') {
equalsTerm++;
if(src[length+equalsTerm] == '=')
equalsTerm++;
}
numQuantums = (length + equalsTerm) / 4;
/* Don't allocate a buffer if the decoded length is 0 */
if (numQuantums <= 0)
return 0;
rawlen = (numQuantums * 3) - equalsTerm;
/* The buffer must be large enough to make room for the last quantum
(which may be partially thrown out) and the zero terminator. */
newstr = malloc(rawlen+4);
if(!newstr)
return 0;
*outptr = newstr;
/* Decode all but the last quantum (which may not decode to a
multiple of 3 bytes) */
for(i = 0; i < numQuantums - 1; i++) {
decodeQuantum((unsigned char *)newstr, src);
newstr += 3; src += 4;
}
/* This final decode may actually read slightly past the end of the buffer
if the input string is missing pad bytes. This will almost always be
harmless. */
decodeQuantum(lastQuantum, src);
for(i = 0; i < 3 - equalsTerm; i++)
newstr[i] = lastQuantum[i];
newstr[i] = 0; /* zero terminate */
return rawlen;
}
/*
* Curl_base64_encode()
*
* Returns the length of the newly created base64 string. The third argument
* is a pointer to an allocated area holding the base64 data. If something
* went wrong, -1 is returned.
*
*/
size_t Curl_base64_encode(struct SessionHandle *data,
const char *inp, size_t insize, char **outptr)
{
unsigned char ibuf[3];
unsigned char obuf[4];
int i;
int inputparts;
char *output;
char *base64data;
#ifdef CURL_DOES_CONVERSIONS
char *convbuf = NULL;
#endif
char *indata = (char *)inp;
*outptr = NULL; /* set to NULL in case of failure before we reach the end */
if(0 == insize)
insize = strlen(indata);
base64data = output = (char*)malloc(insize*4/3+4);
if(NULL == output)
return 0;
#ifdef CURL_DOES_CONVERSIONS
/*
* The base64 data needs to be created using the network encoding
* not the host encoding. And we can't change the actual input
* so we copy it to a buffer, translate it, and use that instead.
*/
if(data) {
convbuf = (char*)malloc(insize);
if(!convbuf) {
free(output);
return 0;
}
memcpy(convbuf, indata, insize);
if(CURLE_OK != Curl_convert_to_network(data, convbuf, insize)) {
free(convbuf);
free(output);
return 0;
}
indata = convbuf; /* switch to the converted buffer */
}
#else
(void)data;
#endif
while(insize > 0) {
for (i = inputparts = 0; i < 3; i++) {
if(insize > 0) {
inputparts++;
ibuf[i] = *indata;
indata++;
insize--;
}
else
ibuf[i] = 0;
}
obuf[0] = (unsigned char) ((ibuf[0] & 0xFC) >> 2);
obuf[1] = (unsigned char) (((ibuf[0] & 0x03) << 4) | \
((ibuf[1] & 0xF0) >> 4));
obuf[2] = (unsigned char) (((ibuf[1] & 0x0F) << 2) | \
((ibuf[2] & 0xC0) >> 6));
obuf[3] = (unsigned char) (ibuf[2] & 0x3F);
switch(inputparts) {
case 1: /* only one byte read */
snprintf(output, 5, "%c%c==",
table64[obuf[0]],
table64[obuf[1]]);
break;
case 2: /* two bytes read */
snprintf(output, 5, "%c%c%c=",
table64[obuf[0]],
table64[obuf[1]],
table64[obuf[2]]);
break;
default:
snprintf(output, 5, "%c%c%c%c",
table64[obuf[0]],
table64[obuf[1]],
table64[obuf[2]],
table64[obuf[3]] );
break;
}
output += 4;
}
*output=0;
*outptr = base64data; /* make it return the actual data memory */
#ifdef CURL_DOES_CONVERSIONS
if(data)
free(convbuf);
#endif
return strlen(base64data); /* return the length of the new data */
}
/* ---- End of Base64 Encoding ---- */
/************* TEST HARNESS STUFF ****************/
#ifdef TEST_ENCODE
/* encoding test harness. Read in standard input and write out the length
* returned by Curl_base64_encode, followed by the base64'd data itself
*/
#include <stdio.h>
#define TEST_NEED_SUCK
void *suck(int *);
int main(int argc, argv_item_t argv[], char **envp)
{
char *base64;
size_t base64Len;
unsigned char *data;
int dataLen;
struct SessionHandle *handle = NULL;
#ifdef CURL_DOES_CONVERSIONS
/* get a Curl handle so Curl_base64_encode can translate properly */
handle = curl_easy_init();
if(handle == NULL) {
fprintf(stderr, "Error: curl_easy_init failed\n");
return 0;
}
#endif
data = (unsigned char *)suck(&dataLen);
base64Len = Curl_base64_encode(handle, data, dataLen, &base64);
fprintf(stderr, "%d\n", base64Len);
fprintf(stdout, "%s\n", base64);
free(base64); free(data);
#ifdef CURL_DOES_CONVERSIONS
curl_easy_cleanup(handle);
#endif
return 0;
}
#endif
#ifdef TEST_DECODE
/* decoding test harness. Read in a base64 string from stdin and write out the
* length returned by Curl_base64_decode, followed by the decoded data itself
*
* gcc -DTEST_DECODE base64.c -o base64 mprintf.o memdebug.o
*/
#include <stdio.h>
#define TEST_NEED_SUCK
void *suck(int *);
int main(int argc, argv_item_t argv[], char **envp)
{
char *base64;
int base64Len;
unsigned char *data;
int dataLen;
int i, j;
#ifdef CURL_DOES_CONVERSIONS
/* get a Curl handle so main can translate properly */
struct SessionHandle *handle = curl_easy_init();
if(handle == NULL) {
fprintf(stderr, "Error: curl_easy_init failed\n");
return 0;
}
#endif
base64 = (char *)suck(&base64Len);
dataLen = Curl_base64_decode(base64, &data);
fprintf(stderr, "%d\n", dataLen);
for(i=0; i < dataLen; i+=0x10) {
printf("0x%02x: ", i);
for(j=0; j < 0x10; j++)
if((j+i) < dataLen)
printf("%02x ", data[i+j]);
else
printf(" ");
printf(" | ");
for(j=0; j < 0x10; j++)
if((j+i) < dataLen) {
#ifdef CURL_DOES_CONVERSIONS
if(CURLE_OK !=
Curl_convert_from_network(handle, &data[i+j], (size_t)1))
data[i+j] = '.';
#endif /* CURL_DOES_CONVERSIONS */
printf("%c", ISGRAPH(data[i+j])?data[i+j]:'.');
} else
break;
puts("");
}
#ifdef CURL_DOES_CONVERSIONS
curl_easy_cleanup(handle);
#endif
free(base64); free(data);
return 0;
}
#endif
#ifdef TEST_NEED_SUCK
/* this function 'sucks' in as much as possible from stdin */
void *suck(int *lenptr)
{
int cursize = 8192;
unsigned char *buf = NULL;
int lastread;
int len = 0;
do {
cursize *= 2;
buf = (unsigned char *)realloc(buf, cursize);
memset(buf + len, 0, cursize - len);
lastread = fread(buf + len, 1, cursize - len, stdin);
len += lastread;
} while(!feof(stdin));
lenptr[0] = len;
return (void *)buf;
}
#endif
Jump to Line
Something went wrong with that request. Please try again.