mirror of
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94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
/*
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* Copyright (c) 2006-2007 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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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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*/
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#include <string.h>
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#include "encoding.h"
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int
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unpack_data(char *buf, size_t buflen, char *data, size_t datalen, 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
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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 / 62;
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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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if (pos % 62 == 0) {
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*writer-- = '.';
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dots--;
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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 total;
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}
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int
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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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