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69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
// Base32 implementation
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//
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// Copyright 2010 Google Inc.
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// Author: Markus Gutschke
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Encode and decode from base32 encoding using the following alphabet:
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// ABCDEFGHIJKLMNOPQRSTUVWXYZ234567
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// This alphabet is documented in RFC 4648/3548
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//
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// We allow white-space and hyphens, but all other characters are considered
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// invalid.
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//
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// All functions return the number of output bytes or -1 on error. If the
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// output buffer is too small, the result will silently be truncated.
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#ifndef XMRIG_BASE32_H
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#define XMRIG_BASE32_H
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#include <stdint.h>
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int base32_encode(const uint8_t *data, int length, uint8_t *result, int bufSize) {
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if (length < 0 || length > (1 << 28)) {
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return -1;
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}
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int count = 0;
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if (length > 0) {
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int buffer = data[0];
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int next = 1;
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int bitsLeft = 8;
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while (count < bufSize && (bitsLeft > 0 || next < length)) {
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if (bitsLeft < 5) {
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if (next < length) {
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buffer <<= 8;
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buffer |= data[next++] & 0xFF;
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bitsLeft += 8;
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} else {
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int pad = 5 - bitsLeft;
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buffer <<= pad;
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bitsLeft += pad;
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}
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}
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int index = 0x1F & (buffer >> (bitsLeft - 5));
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bitsLeft -= 5;
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result[count++] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"[index];
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}
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}
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if (count < bufSize) {
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result[count] = '\000';
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}
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return count;
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}
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#endif /* XMRIG_BASE32_H */
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