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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_LIBDEXFILE_DEX_BASE64_TEST_UTIL_H_
#define ART_LIBDEXFILE_DEX_BASE64_TEST_UTIL_H_
#include <stdint.h>
#include <stdlib.h>
#include <memory>
#include <vector>
#include <android-base/logging.h>
namespace art {
static inline uint8_t* DecodeBase64(const char* src, size_t* dst_size) {
static const uint8_t kBase64Map[256] = {
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255
};
CHECK(dst_size != nullptr);
std::vector<uint8_t> tmp;
uint32_t t = 0, y = 0;
int g = 3;
for (size_t i = 0; src[i] != '\0'; ++i) {
uint8_t c = kBase64Map[src[i] & 0xFF];
if (c == 255) continue;
// the final = symbols are read and used to trim the remaining bytes
if (c == 254) {
c = 0;
// prevent g < 0 which would potentially allow an overflow later
if (--g < 0) {
*dst_size = 0;
return nullptr;
}
} else if (g != 3) {
// we only allow = to be at the end
*dst_size = 0;
return nullptr;
}
t = (t << 6) | c;
if (++y == 4) {
tmp.push_back((t >> 16) & 255);
if (g > 1) {
tmp.push_back((t >> 8) & 255);
}
if (g > 2) {
tmp.push_back(t & 255);
}
y = t = 0;
}
}
if (y != 0) {
*dst_size = 0;
return nullptr;
}
std::unique_ptr<uint8_t[]> dst(new uint8_t[tmp.size()]);
*dst_size = tmp.size();
std::copy(tmp.begin(), tmp.end(), dst.get());
return dst.release();
}
} // namespace art
#endif // ART_LIBDEXFILE_DEX_BASE64_TEST_UTIL_H_
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