diff options
Diffstat (limited to 'Utilities/cmcurl/lib/base64.c')
| -rw-r--r-- | Utilities/cmcurl/lib/base64.c | 80 |
1 files changed, 37 insertions, 43 deletions
diff --git a/Utilities/cmcurl/lib/base64.c b/Utilities/cmcurl/lib/base64.c index 960a1ca3ad..52654c2bc3 100644 --- a/Utilities/cmcurl/lib/base64.c +++ b/Utilities/cmcurl/lib/base64.c @@ -18,6 +18,8 @@ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * + * SPDX-License-Identifier: curl + * ***************************************************************************/ /* Base64 encoding/decoding */ @@ -41,10 +43,11 @@ #include "memdebug.h" /* ---- Base64 Encoding/Decoding Table --- */ +/* Padding character string starts at offset 64. */ static const char base64[]= - "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; -/* The Base 64 encoding with an URL and filename safe alphabet, RFC 4648 +/* The Base 64 encoding with a URL and filename safe alphabet, RFC 4648 section 5 */ static const char base64url[]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; @@ -52,25 +55,18 @@ static const char base64url[]= static size_t decodeQuantum(unsigned char *dest, const char *src) { size_t padding = 0; - const char *s, *p; + const char *s; unsigned long i, x = 0; for(i = 0, s = src; i < 4; i++, s++) { if(*s == '=') { - x = (x << 6); + x <<= 6; padding++; } else { - unsigned long v = 0; - p = base64; - - while(*p && (*p != *s)) { - v++; - p++; - } - - if(*p == *s) - x = (x << 6) + v; + const char *p = strchr(base64, *s); + if(p) + x = (x << 6) + curlx_uztoul(p - base64); else return 0; } @@ -107,11 +103,11 @@ CURLcode Curl_base64_decode(const char *src, unsigned char **outptr, size_t *outlen) { size_t srclen = 0; - size_t length = 0; size_t padding = 0; size_t i; size_t numQuantums; size_t rawlen = 0; + const char *padptr; unsigned char *pos; unsigned char *newstr; @@ -124,19 +120,17 @@ CURLcode Curl_base64_decode(const char *src, 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] == '=') { + padptr = strchr(src, '='); + if(padptr) { padding++; - if(src[length + 1] == '=') + /* A maximum of two = padding characters is allowed */ + if(padptr[1] == '=') padding++; - } - /* Check the = padding characters weren't part way through the input */ - if(length + padding != srclen) - return CURLE_BAD_CONTENT_ENCODING; + /* Check the = padding characters weren't part way through the input */ + if(padptr + padding != src + srclen) + return CURLE_BAD_CONTENT_ENCODING; + } /* Calculate the number of quantums */ numQuantums = srclen / 4; @@ -144,7 +138,7 @@ CURLcode Curl_base64_decode(const char *src, /* Calculate the size of the decoded string */ rawlen = (numQuantums * 3) - padding; - /* Allocate our buffer including room for a zero terminator */ + /* Allocate our buffer including room for a null-terminator */ newstr = malloc(rawlen + 1); if(!newstr) return CURLE_OUT_OF_MEMORY; @@ -185,6 +179,7 @@ static CURLcode base64_encode(const char *table64, char *output; char *base64data; const char *indata = inputbuff; + const char *padstr = &table64[64]; /* Point to padding string. */ *outptr = NULL; *outlen = 0; @@ -222,27 +217,30 @@ static CURLcode base64_encode(const char *table64, switch(inputparts) { case 1: /* only one byte read */ - msnprintf(output, 5, "%c%c==", - table64[obuf[0]], - table64[obuf[1]]); + i = msnprintf(output, 5, "%c%c%s%s", + table64[obuf[0]], + table64[obuf[1]], + padstr, + padstr); break; case 2: /* two bytes read */ - msnprintf(output, 5, "%c%c%c=", - table64[obuf[0]], - table64[obuf[1]], - table64[obuf[2]]); + i = msnprintf(output, 5, "%c%c%c%s", + table64[obuf[0]], + table64[obuf[1]], + table64[obuf[2]], + padstr); break; default: - msnprintf(output, 5, "%c%c%c%c", - table64[obuf[0]], - table64[obuf[1]], - table64[obuf[2]], - table64[obuf[3]]); + i = msnprintf(output, 5, "%c%c%c%c", + table64[obuf[0]], + table64[obuf[1]], + table64[obuf[2]], + table64[obuf[3]]); break; } - output += 4; + output += i; } /* Zero terminate */ @@ -270,8 +268,6 @@ static CURLcode base64_encode(const char *table64, * 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(const char *inputbuff, size_t insize, @@ -293,8 +289,6 @@ CURLcode Curl_base64_encode(const char *inputbuff, size_t insize, * 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(const char *inputbuff, size_t insize, |