* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
- * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2014, 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
*
***************************************************************************/
-/* 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"
+/* Base64 encoding/decoding */
-#include <stdlib.h>
-#include <string.h>
+#include "curl_setup.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 "warnless.h"
#include "curl_base64.h"
#include "curl_memory.h"
+#include "non-ascii.h"
/* include memdebug.h last */
#include "memdebug.h"
/* ---- Base64 Encoding/Decoding Table --- */
-static const char table64[]=
+static const char base64[]=
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-static void decodeQuantum(unsigned char *dest, const char *src)
+/* The Base 64 encoding with an URL and filename safe alphabet, RFC 4648
+ section 5 */
+static const char base64url[]=
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+static size_t decodeQuantum(unsigned char *dest, const char *src)
{
+ size_t padding = 0;
const char *s, *p;
- unsigned long i, v, x = 0;
+ unsigned long i, x = 0;
for(i = 0, s = src; i < 4; i++, s++) {
- v = 0;
- p = table64;
- while(*p && (*p != *s)) {
- v++;
- p++;
- }
- if(*p == *s)
- x = (x << 6) + v;
- else if(*s == '=')
+ unsigned long v = 0;
+
+ if(*s == '=') {
x = (x << 6);
+ padding++;
+ }
+ else {
+ p = base64;
+
+ while(*p && (*p != *s)) {
+ v++;
+ p++;
+ }
+
+ if(*p == *s)
+ x = (x << 6) + v;
+ else
+ return 0;
+ }
}
- dest[2] = curlx_ultouc(x);
+ if(padding < 1)
+ dest[2] = curlx_ultouc(x & 0xFFUL);
+
x >>= 8;
- dest[1] = curlx_ultouc(x);
+ if(padding < 2)
+ dest[1] = curlx_ultouc(x & 0xFFUL);
+
x >>= 8;
- dest[0] = curlx_ultouc(x);
+ dest[0] = curlx_ultouc(x & 0xFFUL);
+
+ return 3 - padding;
}
/*
* 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.
+ * Given a base64 NUL-terminated string at src, decode it and return a
+ * pointer in *outptr to a newly allocated memory area holding decoded
+ * data. Size of decoded data is returned in variable pointed by outlen.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When decoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
*/
-size_t Curl_base64_decode(const char *src, unsigned char **outptr)
+CURLcode Curl_base64_decode(const char *src,
+ unsigned char **outptr, size_t *outlen)
{
+ size_t srclen = 0;
size_t length = 0;
- size_t equalsTerm = 0;
+ size_t padding = 0;
size_t i;
size_t numQuantums;
- unsigned char lastQuantum[3];
size_t rawlen = 0;
+ unsigned char *pos;
unsigned char *newstr;
*outptr = NULL;
+ *outlen = 0;
+ srclen = strlen(src);
+ /* Check the length of the input string is valid */
+ if(!srclen || srclen % 4)
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ /* Find the position of any = padding characters */
while((src[length] != '=') && src[length])
length++;
+
/* A maximum of two = padding characters is allowed */
if(src[length] == '=') {
- equalsTerm++;
- if(src[length+equalsTerm] == '=')
- equalsTerm++;
+ padding++;
+ if(src[length + 1] == '=')
+ padding++;
}
- numQuantums = (length + equalsTerm) / 4;
- /* Don't allocate a buffer if the decoded length is 0 */
- if(numQuantums == 0)
- return 0;
+ /* Check the = padding characters weren't part way through the input */
+ if(length + padding != srclen)
+ return CURLE_BAD_CONTENT_ENCODING;
- rawlen = (numQuantums * 3) - equalsTerm;
+ /* Calculate the number of quantums */
+ numQuantums = srclen / 4;
- /* 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);
+ /* Calculate the size of the decoded string */
+ rawlen = (numQuantums * 3) - padding;
+
+ /* Allocate our buffer including room for a zero terminator */
+ newstr = malloc(rawlen + 1);
if(!newstr)
- return 0;
+ return CURLE_OUT_OF_MEMORY;
- *outptr = newstr;
+ pos = 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(newstr, src);
- newstr += 3; src += 4;
+ /* Decode the quantums */
+ for(i = 0; i < numQuantums; i++) {
+ size_t result = decodeQuantum(pos, src);
+ if(!result) {
+ Curl_safefree(newstr);
+
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+
+ pos += result;
+ 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];
+ /* Zero terminate */
+ *pos = '\0';
- newstr[i] = '\0'; /* zero terminate */
- return rawlen;
+ /* Return the decoded data */
+ *outptr = newstr;
+ *outlen = rawlen;
+
+ return CURLE_OK;
}
-/*
- * 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, 0 is returned.
- *
- */
-size_t Curl_base64_encode(struct SessionHandle *data,
- const char *inputbuff, size_t insize,
- char **outptr)
+static CURLcode base64_encode(const char *table64,
+ struct SessionHandle *data,
+ const char *inputbuff, size_t insize,
+ char **outptr, size_t *outlen)
{
+ CURLcode error;
unsigned char ibuf[3];
unsigned char obuf[4];
int i;
int inputparts;
char *output;
char *base64data;
-#ifdef CURL_DOES_CONVERSIONS
char *convbuf = NULL;
-#endif
const char *indata = inputbuff;
- *outptr = NULL; /* set to NULL in case of failure before we reach the end */
+ *outptr = NULL;
+ *outlen = 0;
if(0 == insize)
insize = strlen(indata);
base64data = output = malloc(insize*4/3+4);
if(NULL == output)
- return 0;
+ return CURLE_OUT_OF_MEMORY;
-#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 = 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 */
+ error = Curl_convert_clone(data, indata, insize, &convbuf);
+ if(error) {
+ free(output);
+ return error;
}
-#else
- (void)data;
-#endif
+
+ if(convbuf)
+ indata = (char *)convbuf;
while(insize > 0) {
- for (i = inputparts = 0; i < 3; i++) {
+ for(i = inputparts = 0; i < 3; i++) {
if(insize > 0) {
inputparts++;
ibuf[i] = (unsigned char) *indata;
}
output += 4;
}
- *output=0;
- *outptr = base64data; /* make it return the actual data memory */
+ *output = '\0';
+ *outptr = base64data; /* return pointer to new data, allocated memory */
-#ifdef CURL_DOES_CONVERSIONS
- if(data)
+ if(convbuf)
free(convbuf);
-#endif
- return strlen(base64data); /* return the length of the new data */
+
+ *outlen = strlen(base64data); /* return the length of the new data */
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_base64_encode()
+ *
+ * Given a pointer to an input buffer and an input size, encode it and
+ * return a pointer in *outptr to a newly allocated memory area holding
+ * encoded data. Size of encoded data is returned in variable pointed by
+ * outlen.
+ *
+ * Input length of 0 indicates input buffer holds a NUL-terminated string.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When encoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64_encode(struct SessionHandle *data,
+ const char *inputbuff, size_t insize,
+ char **outptr, size_t *outlen)
+{
+ return base64_encode(base64, data, inputbuff, insize, outptr, outlen);
+}
+
+/*
+ * Curl_base64url_encode()
+ *
+ * Given a pointer to an input buffer and an input size, encode it and
+ * return a pointer in *outptr to a newly allocated memory area holding
+ * encoded data. Size of encoded data is returned in variable pointed by
+ * outlen.
+ *
+ * Input length of 0 indicates input buffer holds a NUL-terminated string.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When encoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64url_encode(struct SessionHandle *data,
+ const char *inputbuff, size_t insize,
+ char **outptr, size_t *outlen)
+{
+ return base64_encode(base64url, data, inputbuff, insize, outptr, outlen);
}
/* ---- End of Base64 Encoding ---- */
projects / external / curl.git / blobdiff