Alexander Aprelev
a5e41681e5
If there is registered expression compiler, VM debugger uses it to compile expressions. Otherwise, it will fallback to use kernel service compiler. This is needed to support Flutter use case where compiler is running on developer's host machine, not on the device where VM is running. Bug: dartbug.com/31981 Change-Id: I8bdfc8ab45a57c306169abe189f1e24e1b0bcf40 Reviewed-on: https://dart-review.googlesource.com/57520 Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Siva Annamalai <asiva@google.com> Reviewed-by: Ryan Macnak <rmacnak@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 "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(Zone* zone, 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 = zone->Alloc<uint8_t>(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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