forked from osmocom/wireshark
71 lines
1.5 KiB
C
71 lines
1.5 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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* SPDX-License-Identifier: GPL-2.0-or-later
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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 - https://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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