bfb1cead60
as a sentinel as it can legitimately be present. Instead, just use the count of bytes stored in the temp array to determine which bytes to fold into the destination.
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/*
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* Copyright (c) 2013-2015 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include "sudoers.h"
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/*
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* Decode a NUL-terminated string in base64 format and store the
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* result in dst.
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*/
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size_t
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base64_decode(const char *str, unsigned char *dst, size_t dsize)
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{
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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const unsigned char *dst0 = dst;
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const unsigned char *dend = dst + dsize;
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unsigned char ch[4];
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char *pos;
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int i;
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debug_decl(base64_decode, SUDOERS_DEBUG_MATCH)
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/*
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* Convert from base64 to binary. Each base64 char holds 6 bits of data
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* so 4 base64 chars equals 3 chars of data.
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* Padding (with the '=' char) may or may not be present.
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*/
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while (*str != '\0') {
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for (i = 0; i < 4; i++) {
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if (*str == '=' || *str == '\0')
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break;
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if ((pos = strchr(b64, *str++)) == NULL)
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debug_return_size_t((size_t)-1);
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ch[i] = (unsigned char)(pos - b64);
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}
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if (i == 0 || i == 1 || dst == dend)
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break;
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*dst++ = (ch[0] << 2) | ((ch[1] & 0x30) >> 4);
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if (i == 2 || dst == dend)
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break;
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*dst++ = ((ch[1] & 0x0f) << 4) | ((ch[2] & 0x3c) >> 2);
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if (i == 3 || dst == dend)
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break;
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*dst++ = ((ch[2] & 0x03) << 6) | ch[3];
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}
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debug_return_size_t((size_t)(dst - dst0));
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}
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