57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
//===--- Base64.h - Base64 Encoder/Decoder ----------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file provides generic base64 encoder/decoder.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_BASE64_H
|
|
#define LLVM_SUPPORT_BASE64_H
|
|
|
|
#include <string>
|
|
|
|
namespace llvm {
|
|
|
|
template <class InputBytes> std::string encodeBase64(InputBytes const &Bytes) {
|
|
static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
"abcdefghijklmnopqrstuvwxyz"
|
|
"0123456789+/";
|
|
std::string Buffer;
|
|
Buffer.resize(((Bytes.size() + 2) / 3) * 4);
|
|
|
|
size_t i = 0, j = 0;
|
|
for (size_t n = Bytes.size() / 3 * 3; i < n; i += 3, j += 4) {
|
|
uint32_t x = ((unsigned char)Bytes[i] << 16) |
|
|
((unsigned char)Bytes[i + 1] << 8) |
|
|
(unsigned char)Bytes[i + 2];
|
|
Buffer[j + 0] = Table[(x >> 18) & 63];
|
|
Buffer[j + 1] = Table[(x >> 12) & 63];
|
|
Buffer[j + 2] = Table[(x >> 6) & 63];
|
|
Buffer[j + 3] = Table[x & 63];
|
|
}
|
|
if (i + 1 == Bytes.size()) {
|
|
uint32_t x = ((unsigned char)Bytes[i] << 16);
|
|
Buffer[j + 0] = Table[(x >> 18) & 63];
|
|
Buffer[j + 1] = Table[(x >> 12) & 63];
|
|
Buffer[j + 2] = '=';
|
|
Buffer[j + 3] = '=';
|
|
} else if (i + 2 == Bytes.size()) {
|
|
uint32_t x =
|
|
((unsigned char)Bytes[i] << 16) | ((unsigned char)Bytes[i + 1] << 8);
|
|
Buffer[j + 0] = Table[(x >> 18) & 63];
|
|
Buffer[j + 1] = Table[(x >> 12) & 63];
|
|
Buffer[j + 2] = Table[(x >> 6) & 63];
|
|
Buffer[j + 3] = '=';
|
|
}
|
|
return Buffer;
|
|
}
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|