forked from osmocom/wireshark
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* base32.c
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* Base-32 conversion
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <string.h>
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#include "base32.h"
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/*
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* Cjdns style base32 encoding
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*/
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/** Returned by ws_base32_encode() if the input is not valid base32. */
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#define Base32_BAD_INPUT -1
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/** Returned by ws_base32_encode() if the output buffer is too small. */
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#define Base32_TOO_BIG -2
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int ws_base32_decode(guint8* output, const guint32 outputLength,
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const guint8* in, const guint32 inputLength)
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{
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guint32 outIndex = 0;
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guint32 inIndex = 0;
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guint32 work = 0;
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guint32 bits = 0;
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static const guint8* kChars = (guint8*) "0123456789bcdfghjklmnpqrstuvwxyz";
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while (inIndex < inputLength) {
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work |= ((unsigned) in[inIndex++]) << bits;
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bits += 8;
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while (bits >= 5) {
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if (outIndex >= outputLength) {
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return Base32_TOO_BIG;
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}
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output[outIndex++] = kChars[work & 31];
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bits -= 5;
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work >>= 5;
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}
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}
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if (bits) {
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if (outIndex >= outputLength) {
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return Base32_TOO_BIG;
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}
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output[outIndex++] = kChars[work & 31];
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}
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if (outIndex < outputLength) {
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output[outIndex] = '\0';
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}
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return outIndex;
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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