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/* base32.c
* Base-32 conversion
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include "config.h"
#include <glib.h>
#include <string.h>
#include "base32.h"
/*
* Cjdns style base32 encoding
*/
/** Returned by ws_base32_encode() if the input is not valid base32. */
#define Base32_BAD_INPUT -1
/** Returned by ws_base32_encode() if the output buffer is too small. */
#define Base32_TOO_BIG -2
int ws_base32_decode(guint8* output, const guint32 outputLength,
const guint8* in, const guint32 inputLength)
{
guint32 outIndex = 0;
guint32 inIndex = 0;
guint32 work = 0;
guint32 bits = 0;
static const guint8* kChars = (guint8*) "0123456789bcdfghjklmnpqrstuvwxyz";
while (inIndex < inputLength) {
work |= ((unsigned) in[inIndex++]) << bits;
bits += 8;
while (bits >= 5) {
if (outIndex >= outputLength) {
return Base32_TOO_BIG;
}
output[outIndex++] = kChars[work & 31];
bits -= 5;
work >>= 5;
}
}
if (bits) {
if (outIndex >= outputLength) {
return Base32_TOO_BIG;
}
output[outIndex++] = kChars[work & 31];
}
if (outIndex < outputLength) {
output[outIndex] = '\0';
}
return outIndex;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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