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b9c86f07dc
TEST=bots Bug: https://github.com/dart-lang/sdk/issues/43642 Change-Id: I7bc2b3b5231413967f9b1f608c957326ff6c6aaa Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/171680 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/base64.h"
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#include "platform/allocation.h"
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#include "vm/os.h"
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namespace dart {
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// Taken from lib/_http/crypto.dart
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// Lookup table used for finding Base 64 alphabet index of a given byte.
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// -2 : Outside Base 64 alphabet.
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// -1 : '\r' or '\n'
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// 0 : = (Padding character).
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// >0 : Base 64 alphabet index of given byte.
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static const int8_t decode_table[] = {
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -2, -2, -1, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, 62, -2, 63, //
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, 00, -2, -2, //
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-2, 00, 01, 02, 03, 04, 05, 06, 07, 8, 9, 10, 11, 12, 13, 14, //
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2, 63, //
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-2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, //
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2};
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static const char PAD = '=';
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uint8_t* DecodeBase64(const char* str, intptr_t* out_decoded_len) {
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intptr_t len = strlen(str);
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if (len == 0 || (len % 4 != 0)) {
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return nullptr;
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}
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int pad_length = 0;
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for (intptr_t i = len - 1; i >= 0; i--) {
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const uint8_t current_code_unit = str[i];
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if (decode_table[current_code_unit] > 0) break;
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if (current_code_unit == PAD) pad_length++;
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}
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intptr_t decoded_en = ((len * 6) >> 3) - pad_length;
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uint8_t* bytes = static_cast<uint8_t*>(malloc(decoded_en));
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for (int i = 0, o = 0; o < decoded_en;) {
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// Accumulate 4 valid 6 bit Base 64 characters into an int.
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int x = 0;
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for (int j = 4; j > 0;) {
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int c = decode_table[(uint8_t)str[i++]];
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if (c >= 0) {
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x = ((x << 6) & 0xFFFFFF) | c;
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j--;
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}
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}
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bytes[o++] = x >> 16;
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if (o < decoded_en) {
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bytes[o++] = (x >> 8) & 0xFF;
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if (o < decoded_en) bytes[o++] = x & 0xFF;
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}
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}
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if (out_decoded_len != nullptr) {
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*out_decoded_len = decoded_en;
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}
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return bytes;
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}
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} // namespace dart
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