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Diffstat (limited to 'src/tools/base64.c')
| -rw-r--r-- | src/tools/base64.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/tools/base64.c b/src/tools/base64.c new file mode 100644 index 0000000..cf37464 --- /dev/null +++ b/src/tools/base64.c @@ -0,0 +1,220 @@ +/* + * Copyright (c) 1996, 1998 by Internet Software Consortium. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + * + * Portions Copyright (c) 1995 by International Business Machines, Inc. + * + * International Business Machines, Inc. (hereinafter called IBM) grants + * permission under its copyrights to use, copy, modify, and distribute this + * Software with or without fee, provided that the above copyright notice and + * all paragraphs of this notice appear in all copies, and that the name of IBM + * not be used in connection with the marketing of any product incorporating + * the Software or modifications thereof, without specific, written prior + * permission. + * + * To the extent it has a right to do so, IBM grants an immunity from suit + * under its patents, if any, for the use, sale or manufacture of products to + * the extent that such products are used for performing Domain Name System + * dynamic updates in TCP/IP networks by means of the Software. No immunity is + * granted for any product per se or for any other function of any product. + * + * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL, + * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN + * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES. + */ + +#include "base64.h" +#include <sys/types.h> +#include <assert.h> +#include <stdlib.h> +#include <ctype.h> + +#if defined(NEED_B64_NTOP) || defined(NEED_B64_PTON) +static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; +static const char pad64 = '='; +#endif + +#ifdef NEED_B64_NTOP +int b64_ntop(unsigned char const *src, size_t srclength, char *target, size_t targsize) +{ + size_t datalength = 0; + uint8_t input[3]; + uint8_t output[4]; + size_t i; + + while (2 < srclength) { + input[0] = *src++; + input[1] = *src++; + input[2] = *src++; + srclength -= 3; + + output[0] = input[0] >> 2; + output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4); + output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6); + output[3] = input[2] & 0x3f; + assert(output[0] < 64); + assert(output[1] < 64); + assert(output[2] < 64); + assert(output[3] < 64); + + if (datalength + 4 > targsize) + return -1; + target[datalength++] = base64[output[0]]; + target[datalength++] = base64[output[1]]; + target[datalength++] = base64[output[2]]; + target[datalength++] = base64[output[3]]; + } + if (0 != srclength) { + input[0] = input[1] = input[2] = '\0'; + for (i = 0; i < srclength; i++) + input[i] = *src++; + output[0] = input[0] >> 2; + output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4); + output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6); + assert(output[0] < 64); + assert(output[1] < 64); + assert(output[2] < 64); + + if (datalength + 4 > targsize) + return -1; + target[datalength++] = base64[output[0]]; + target[datalength++] = base64[output[1]]; + if (srclength == 1) + target[datalength++] = pad64; + else + target[datalength++] = base64[output[2]]; + target[datalength++] = pad64; + } + if (datalength >= targsize) + return (-1); + target[datalength] = '\0'; + return datalength; +} +#endif + +#ifdef NEED_B64_PTON +int b64_pton(char const *src, uint8_t *target, size_t targsize) +{ + static int b64rmap_initialized = 0; + static uint8_t b64rmap[256]; + static const uint8_t b64rmap_special = 0xf0; + static const uint8_t b64rmap_end = 0xfd; + static const uint8_t b64rmap_space = 0xfe; + static const uint8_t b64rmap_invalid = 0xff; + int tarindex, state, ch; + uint8_t ofs; + + if (!b64rmap_initialized) { + int i; + char ch; + b64rmap[0] = b64rmap_end; + for (i = 1; i < 256; ++i) { + ch = (char)i; + if (isspace(ch)) + b64rmap[i] = b64rmap_space; + else if (ch == pad64) + b64rmap[i] = b64rmap_end; + else + b64rmap[i] = b64rmap_invalid; + } + for (i = 0; base64[i] != '\0'; ++i) + b64rmap[(uint8_t)base64[i]] = i; + b64rmap_initialized = 1; + } + + state = 0; + tarindex = 0; + + for (;;) { + ch = *src++; + ofs = b64rmap[ch]; + + if (ofs >= b64rmap_special) { + if (ofs == b64rmap_space) + continue; + if (ofs == b64rmap_end) + break; + return -1; + } + + switch (state) { + case 0: + if ((size_t)tarindex >= targsize) + return -1; + target[tarindex] = ofs << 2; + state = 1; + break; + case 1: + if ((size_t)tarindex + 1 >= targsize) + return -1; + target[tarindex] |= ofs >> 4; + target[tarindex+1] = (ofs & 0x0f) << 4 ; + tarindex++; + state = 2; + break; + case 2: + if ((size_t)tarindex + 1 >= targsize) + return -1; + target[tarindex] |= ofs >> 2; + target[tarindex+1] = (ofs & 0x03) << 6; + tarindex++; + state = 3; + break; + case 3: + if ((size_t)tarindex >= targsize) + return -1; + target[tarindex] |= ofs; + tarindex++; + state = 0; + break; + default: + abort(); + } + } + + if (ch == pad64) { + ch = *src++; + switch (state) { + case 0: + case 1: + return -1; + + case 2: + for (; ch; ch = *src++) { + if (b64rmap[ch] != b64rmap_space) + break; + } + if (ch != pad64) + return -1; + ch = *src++; + case 3: + for (; ch; ch = *src++) { + if (b64rmap[ch] != b64rmap_space) + return -1; + } + if (target[tarindex] != 0) + return -1; + } + } else { + if (state != 0) + return -1; + } + + return tarindex; +} +#endif |