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Diffstat (limited to '3rdParty/Ldns/src/src/compat/b32_ntop.c')
| -rw-r--r-- | 3rdParty/Ldns/src/src/compat/b32_ntop.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/3rdParty/Ldns/src/src/compat/b32_ntop.c b/3rdParty/Ldns/src/src/compat/b32_ntop.c new file mode 100644 index 0000000..038ebdc --- /dev/null +++ b/3rdParty/Ldns/src/src/compat/b32_ntop.c @@ -0,0 +1,333 @@ +/* + * 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 <ldns/config.h> + +#include <sys/types.h> +#include <sys/param.h> +#ifdef HAVE_SYS_SOCKET_H +#include <sys/socket.h> +#endif + +#ifdef HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif +#ifdef HAVE_ARPA_INET_H +#include <arpa/inet.h> +#endif + +#include <ctype.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <assert.h> + +static const char Base32[] = + "abcdefghijklmnopqrstuvwxyz234567"; +/* "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";*/ +/* 00000000001111111111222222222233 + 01234567890123456789012345678901*/ +static const char Base32_extended_hex[] = +/* "0123456789ABCDEFGHIJKLMNOPQRSTUV";*/ + "0123456789abcdefghijklmnopqrstuv"; +static const char Pad32 = '='; + +/* (From RFC3548 and draft-josefsson-rfc3548bis-00.txt) +5. Base 32 Encoding + + The Base 32 encoding is designed to represent arbitrary sequences of + octets in a form that needs to be case insensitive but need not be + humanly readable. + + A 33-character subset of US-ASCII is used, enabling 5 bits to be + represented per printable character. (The extra 33rd character, "=", + is used to signify a special processing function.) + + The encoding process represents 40-bit groups of input bits as output + strings of 8 encoded characters. Proceeding from left to right, a + 40-bit input group is formed by concatenating 5 8bit input groups. + These 40 bits are then treated as 8 concatenated 5-bit groups, each + of which is translated into a single digit in the base 32 alphabet. + When encoding a bit stream via the base 32 encoding, the bit stream + must be presumed to be ordered with the most-significant-bit first. + That is, the first bit in the stream will be the high-order bit in + the first 8bit byte, and the eighth bit will be the low-order bit in + the first 8bit byte, and so on. + + Each 5-bit group is used as an index into an array of 32 printable + characters. The character referenced by the index is placed in the + output string. These characters, identified in Table 3, below, are + selected from US-ASCII digits and uppercase letters. + + Table 3: The Base 32 Alphabet + + Value Encoding Value Encoding Value Encoding Value Encoding + 0 A 9 J 18 S 27 3 + 1 B 10 K 19 T 28 4 + 2 C 11 L 20 U 29 5 + 3 D 12 M 21 V 30 6 + 4 E 13 N 22 W 31 7 + 5 F 14 O 23 X + 6 G 15 P 24 Y (pad) = + 7 H 16 Q 25 Z + 8 I 17 R 26 2 + + + Special processing is performed if fewer than 40 bits are available + at the end of the data being encoded. A full encoding quantum is + always completed at the end of a body. When fewer than 40 input bits + are available in an input group, zero bits are added (on the right) + to form an integral number of 5-bit groups. Padding at the end of + the data is performed using the "=" character. Since all base 32 + input is an integral number of octets, only the following cases can + arise: + + (1) the final quantum of encoding input is an integral multiple of 40 + bits; here, the final unit of encoded output will be an integral + multiple of 8 characters with no "=" padding, + + (2) the final quantum of encoding input is exactly 8 bits; here, the + final unit of encoded output will be two characters followed by six + "=" padding characters, + + (3) the final quantum of encoding input is exactly 16 bits; here, the + final unit of encoded output will be four characters followed by four + "=" padding characters, + + (4) the final quantum of encoding input is exactly 24 bits; here, the + final unit of encoded output will be five characters followed by + three "=" padding characters, or + + (5) the final quantum of encoding input is exactly 32 bits; here, the + final unit of encoded output will be seven characters followed by one + "=" padding character. + + +6. Base 32 Encoding with Extended Hex Alphabet + + The following description of base 32 is due to [7]. This encoding + should not be regarded as the same as the "base32" encoding, and + should not be referred to as only "base32". + + One property with this alphabet, that the base64 and base32 alphabet + lack, is that encoded data maintain its sort order when the encoded + data is compared bit-wise. + + This encoding is identical to the previous one, except for the + alphabet. The new alphabet is found in table 4. + + Table 4: The "Extended Hex" Base 32 Alphabet + + Value Encoding Value Encoding Value Encoding Value Encoding + 0 0 9 9 18 I 27 R + 1 1 10 A 19 J 28 S + 2 2 11 B 20 K 29 T + 3 3 12 C 21 L 30 U + 4 4 13 D 22 M 31 V + 5 5 14 E 23 N + 6 6 15 F 24 O (pad) = + 7 7 16 G 25 P + 8 8 17 H 26 Q + +*/ + + +int +ldns_b32_ntop_ar(uint8_t const *src, size_t srclength, char *target, size_t targsize, const char B32_ar[]) { + size_t datalength = 0; + uint8_t input[5]; + uint8_t output[8]; + size_t i; + memset(output, 0, 8); + + while (4 < srclength) { + input[0] = *src++; + input[1] = *src++; + input[2] = *src++; + input[3] = *src++; + input[4] = *src++; + srclength -= 5; + + output[0] = (input[0] & 0xf8) >> 3; + output[1] = ((input[0] & 0x07) << 2) + ((input[1] & 0xc0) >> 6); + output[2] = (input[1] & 0x3e) >> 1; + output[3] = ((input[1] & 0x01) << 4) + ((input[2] & 0xf0) >> 4); + output[4] = ((input[2] & 0x0f) << 1) + ((input[3] & 0x80) >> 7); + output[5] = (input[3] & 0x7c) >> 2; + output[6] = ((input[3] & 0x03) << 3) + ((input[4] & 0xe0) >> 5); + output[7] = (input[4] & 0x1f); + + assert(output[0] < 32); + assert(output[1] < 32); + assert(output[2] < 32); + assert(output[3] < 32); + assert(output[4] < 32); + assert(output[5] < 32); + assert(output[6] < 32); + assert(output[7] < 32); + + if (datalength + 8 > targsize) { + return (-1); + } + target[datalength++] = B32_ar[output[0]]; + target[datalength++] = B32_ar[output[1]]; + target[datalength++] = B32_ar[output[2]]; + target[datalength++] = B32_ar[output[3]]; + target[datalength++] = B32_ar[output[4]]; + target[datalength++] = B32_ar[output[5]]; + target[datalength++] = B32_ar[output[6]]; + target[datalength++] = B32_ar[output[7]]; + } + + /* Now we worry about padding. */ + if (0 != srclength) { + /* Get what's left. */ + input[0] = input[1] = input[2] = input[3] = input[4] = (uint8_t) '\0'; + for (i = 0; i < srclength; i++) + input[i] = *src++; + + output[0] = (input[0] & 0xf8) >> 3; + assert(output[0] < 32); + if (srclength >= 1) { + output[1] = ((input[0] & 0x07) << 2) + ((input[1] & 0xc0) >> 6); + assert(output[1] < 32); + output[2] = (input[1] & 0x3e) >> 1; + assert(output[2] < 32); + } + if (srclength >= 2) { + output[3] = ((input[1] & 0x01) << 4) + ((input[2] & 0xf0) >> 4); + assert(output[3] < 32); + } + if (srclength >= 3) { + output[4] = ((input[2] & 0x0f) << 1) + ((input[3] & 0x80) >> 7); + assert(output[4] < 32); + output[5] = (input[3] & 0x7c) >> 2; + assert(output[5] < 32); + } + if (srclength >= 4) { + output[6] = ((input[3] & 0x03) << 3) + ((input[4] & 0xe0) >> 5); + assert(output[6] < 32); + } + + + if (datalength + 1 > targsize) { + return (-2); + } + target[datalength++] = B32_ar[output[0]]; + if (srclength >= 1) { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = B32_ar[output[1]]; + if (srclength == 1 && output[2] == 0) { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } else { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = B32_ar[output[2]]; + } + } else { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } + if (srclength >= 2) { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = B32_ar[output[3]]; + } else { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } + if (srclength >= 3) { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = B32_ar[output[4]]; + if (srclength == 3 && output[5] == 0) { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } else { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = B32_ar[output[5]]; + } + } else { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } + if (srclength >= 4) { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = B32_ar[output[6]]; + } else { + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } + if (datalength + 1 > targsize) { return (-2); } + target[datalength++] = Pad32; + } + if (datalength+1 > targsize) { + return (int) (datalength); + } + target[datalength] = '\0'; /* Returned value doesn't count \0. */ + return (int) (datalength); +} + +int +ldns_b32_ntop(uint8_t const *src, size_t srclength, char *target, size_t targsize) { + return ldns_b32_ntop_ar(src, srclength, target, targsize, Base32); +} + +/* deprecated, here for backwards compatibility */ +int +b32_ntop(uint8_t const *src, size_t srclength, char *target, size_t targsize) { + return ldns_b32_ntop_ar(src, srclength, target, targsize, Base32); +} + +int +ldns_b32_ntop_extended_hex(uint8_t const *src, size_t srclength, char *target, size_t targsize) { + return ldns_b32_ntop_ar(src, srclength, target, targsize, Base32_extended_hex); +} + +/* deprecated, here for backwards compatibility */ +int +b32_ntop_extended_hex(uint8_t const *src, size_t srclength, char *target, size_t targsize) { + return ldns_b32_ntop_ar(src, srclength, target, targsize, Base32_extended_hex); +} + |