101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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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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#ifndef ART_LIBDEXFILE_DEX_BASE64_TEST_UTIL_H_
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#define ART_LIBDEXFILE_DEX_BASE64_TEST_UTIL_H_
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#include <stdint.h>
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#include <stdlib.h>
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#include <memory>
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#include <vector>
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#include <android-base/logging.h>
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namespace art {
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static inline uint8_t* DecodeBase64(const char* src, size_t* dst_size) {
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static const uint8_t kBase64Map[256] = {
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255
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};
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CHECK(dst_size != nullptr);
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std::vector<uint8_t> tmp;
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uint32_t t = 0, y = 0;
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int g = 3;
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for (size_t i = 0; src[i] != '\0'; ++i) {
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uint8_t c = kBase64Map[src[i] & 0xFF];
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if (c == 255) continue;
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// the final = symbols are read and used to trim the remaining bytes
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if (c == 254) {
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c = 0;
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// prevent g < 0 which would potentially allow an overflow later
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if (--g < 0) {
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*dst_size = 0;
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return nullptr;
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}
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} else if (g != 3) {
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// we only allow = to be at the end
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*dst_size = 0;
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return nullptr;
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}
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t = (t << 6) | c;
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if (++y == 4) {
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tmp.push_back((t >> 16) & 255);
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if (g > 1) {
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tmp.push_back((t >> 8) & 255);
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}
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if (g > 2) {
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tmp.push_back(t & 255);
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}
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y = t = 0;
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}
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}
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if (y != 0) {
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*dst_size = 0;
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return nullptr;
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}
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std::unique_ptr<uint8_t[]> dst(new uint8_t[tmp.size()]);
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*dst_size = tmp.size();
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std::copy(tmp.begin(), tmp.end(), dst.get());
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return dst.release();
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}
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} // namespace art
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#endif // ART_LIBDEXFILE_DEX_BASE64_TEST_UTIL_H_
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