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4591cafd27
Why not using constant bools? Much simpler than complex function calls, that eventually return constant values. Signed-off-by: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
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* Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
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* 2006-2009 Bjorn Andersson <flex@kryo.se>
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*
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* Permission to use, copy, modify, and/or 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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*/
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#include <string.h>
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#include "common.h"
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#include "encoding.h"
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int build_hostname(char *buf, size_t buflen, const char *data,
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const size_t datalen, const char *topdomain,
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const struct encoder *encoder, int maxlen)
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{
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size_t space;
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char *b;
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space = MIN((size_t)maxlen, buflen) - strlen(topdomain) - 8;
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/* 8 = 5 max header length + 1 dot before topdomain + 2 safety */
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if (!encoder->places_dots)
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space -= (space / 57); /* space for dots */
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memset(buf, 0, buflen);
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encoder->encode(buf, &space, data, datalen);
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if (!encoder->places_dots)
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inline_dotify(buf, buflen);
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b = buf;
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b += strlen(buf);
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/* move b back one step to see if the dot is there */
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b--;
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if (*b != '.')
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*++b = '.';
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b++;
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/* move b ahead of the string so we can copy to it */
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strncpy(b, topdomain, strlen(topdomain)+1);
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return space;
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}
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int unpack_data(char *buf, size_t buflen, char *data, size_t datalen,
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const struct encoder *enc)
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{
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if (!enc->eats_dots)
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datalen = inline_undotify(data, datalen);
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return enc->decode(buf, &buflen, data, datalen);
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}
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int inline_dotify(char *buf, size_t buflen)
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{
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unsigned dots;
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unsigned pos;
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unsigned total;
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char *reader, *writer;
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total = strlen(buf);
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dots = total / 57;
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writer = buf;
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writer += total;
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writer += dots;
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total += dots;
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if (strlen(buf) + dots > buflen) {
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writer = buf;
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writer += buflen;
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total = buflen;
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}
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reader = writer - dots;
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pos = (unsigned) (reader - buf) + 1;
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while (dots) {
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*writer-- = *reader--;
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pos--;
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if (pos % 57 == 0) {
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*writer-- = '.';
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dots--;
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}
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}
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/* return new length of string */
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return total;
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}
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int inline_undotify(char *buf, size_t len)
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{
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unsigned pos;
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unsigned dots;
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char *reader, *writer;
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writer = buf;
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reader = writer;
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pos = 0;
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dots = 0;
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while (pos < len) {
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if (*reader == '.') {
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reader++;
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pos++;
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dots++;
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continue;
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}
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*writer++ = *reader++;
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pos++;
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}
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/* return new length of string */
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return len - dots;
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}
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