mirror of
https://github.com/danog/ton.git
synced 2024-12-12 17:17:22 +01:00
303 lines
8.2 KiB
C++
303 lines
8.2 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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*/
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#include "td/utils/base64.h"
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#include "td/utils/common.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Status.h"
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#include "td/utils/format.h"
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#include <algorithm>
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#include <iterator>
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namespace td {
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//TODO: fix copypaste
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static const char *const symbols64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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string base64_encode(Slice input) {
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string base64;
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base64.reserve((input.size() + 2) / 3 * 4);
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for (size_t i = 0; i < input.size();) {
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size_t left = min(input.size() - i, static_cast<size_t>(3));
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int c = input.ubegin()[i++] << 16;
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base64 += symbols64[c >> 18];
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if (left != 1) {
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c |= input.ubegin()[i++] << 8;
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}
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base64 += symbols64[(c >> 12) & 63];
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if (left == 3) {
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c |= input.ubegin()[i++];
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}
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if (left != 1) {
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base64 += symbols64[(c >> 6) & 63];
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} else {
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base64 += '=';
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}
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if (left == 3) {
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base64 += symbols64[c & 63];
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} else {
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base64 += '=';
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}
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}
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return base64;
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}
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static unsigned char char_to_value[256];
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static void init_base64_table() {
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static bool is_inited = [] {
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std::fill(std::begin(char_to_value), std::end(char_to_value), static_cast<unsigned char>(64));
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for (unsigned char i = 0; i < 64; i++) {
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char_to_value[static_cast<size_t>(symbols64[i])] = i;
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}
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return true;
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}();
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CHECK(is_inited);
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}
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Result<Slice> base64_drop_padding(Slice base64) {
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if ((base64.size() & 3) != 0) {
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return Status::Error("Wrong string length");
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}
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size_t padding_length = 0;
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while (!base64.empty() && base64.back() == '=') {
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base64.remove_suffix(1);
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padding_length++;
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}
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if (padding_length >= 3) {
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return Status::Error("Wrong string padding");
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}
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return base64;
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}
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template <class F>
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Status base64_do_decode(Slice base64, F &&append) {
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for (size_t i = 0; i < base64.size();) {
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size_t left = min(base64.size() - i, static_cast<size_t>(4));
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int c = 0;
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for (size_t t = 0; t < left; t++) {
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auto value = char_to_value[base64.ubegin()[i++]];
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if (value == 64) {
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return Status::Error("Wrong character in the string");
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}
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c |= value << ((3 - t) * 6);
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}
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append(static_cast<char>(static_cast<unsigned char>(c >> 16))); // implementation-defined
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if (left == 2) {
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if ((c & ((1 << 16) - 1)) != 0) {
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return Status::Error("Wrong padding in the string");
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}
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} else {
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append(static_cast<char>(static_cast<unsigned char>(c >> 8))); // implementation-defined
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if (left == 3) {
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if ((c & ((1 << 8) - 1)) != 0) {
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return Status::Error("Wrong padding in the string");
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}
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} else {
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append(static_cast<char>(static_cast<unsigned char>(c))); // implementation-defined
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}
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}
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}
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return Status::OK();
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}
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Result<string> base64_decode(Slice base64) {
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init_base64_table();
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TRY_RESULT(tmp, base64_drop_padding(base64));
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base64 = tmp;
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string output;
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output.reserve(((base64.size() + 3) >> 2) * 3);
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TRY_STATUS(base64_do_decode(base64, [&output](char c) { output += c; }));
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return output;
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}
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Result<SecureString> base64_decode_secure(Slice base64) {
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init_base64_table();
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TRY_RESULT(tmp, base64_drop_padding(base64));
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base64 = tmp;
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SecureString output(((base64.size() + 3) >> 2) * 3);
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char *ptr = output.as_mutable_slice().begin();
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TRY_STATUS(base64_do_decode(base64, [&ptr](char c) { *ptr++ = c; }));
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size_t size = ptr - output.as_mutable_slice().begin();
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if (size == output.size()) {
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return std::move(output);
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}
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return SecureString(output.as_slice().substr(0, size));
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}
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static const char *const url_symbols64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
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string base64url_encode(Slice input) {
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string base64;
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base64.reserve((input.size() + 2) / 3 * 4);
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for (size_t i = 0; i < input.size();) {
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size_t left = min(input.size() - i, static_cast<size_t>(3));
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int c = input.ubegin()[i++] << 16;
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base64 += url_symbols64[c >> 18];
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if (left != 1) {
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c |= input.ubegin()[i++] << 8;
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}
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base64 += url_symbols64[(c >> 12) & 63];
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if (left == 3) {
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c |= input.ubegin()[i++];
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}
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if (left != 1) {
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base64 += url_symbols64[(c >> 6) & 63];
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}
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if (left == 3) {
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base64 += url_symbols64[c & 63];
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}
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}
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return base64;
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}
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static unsigned char url_char_to_value[256];
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static void init_base64url_table() {
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static bool is_inited = [] {
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std::fill(std::begin(url_char_to_value), std::end(url_char_to_value), static_cast<unsigned char>(64));
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for (unsigned char i = 0; i < 64; i++) {
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url_char_to_value[static_cast<size_t>(url_symbols64[i])] = i;
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}
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return true;
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}();
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CHECK(is_inited);
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}
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Result<string> base64url_decode(Slice base64) {
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init_base64url_table();
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size_t padding_length = 0;
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while (!base64.empty() && base64.back() == '=') {
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base64.remove_suffix(1);
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padding_length++;
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}
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if (padding_length >= 3 || (padding_length > 0 && ((base64.size() + padding_length) & 3) != 0)) {
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return Status::Error("Wrong string padding");
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}
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if ((base64.size() & 3) == 1) {
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return Status::Error("Wrong string length");
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}
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string output;
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output.reserve(((base64.size() + 3) >> 2) * 3);
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for (size_t i = 0; i < base64.size();) {
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size_t left = min(base64.size() - i, static_cast<size_t>(4));
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int c = 0;
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for (size_t t = 0; t < left; t++) {
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auto value = url_char_to_value[base64.ubegin()[i++]];
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if (value == 64) {
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return Status::Error("Wrong character in the string");
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}
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c |= value << ((3 - t) * 6);
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}
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output += static_cast<char>(static_cast<unsigned char>(c >> 16)); // implementation-defined
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if (left == 2) {
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if ((c & ((1 << 16) - 1)) != 0) {
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return Status::Error("Wrong padding in the string");
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}
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} else {
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output += static_cast<char>(static_cast<unsigned char>(c >> 8)); // implementation-defined
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if (left == 3) {
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if ((c & ((1 << 8) - 1)) != 0) {
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return Status::Error("Wrong padding in the string");
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}
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} else {
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output += static_cast<char>(static_cast<unsigned char>(c)); // implementation-defined
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}
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}
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}
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return output;
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}
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template <bool is_url>
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static bool is_base64_impl(Slice input) {
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size_t padding_length = 0;
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while (!input.empty() && input.back() == '=') {
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input.remove_suffix(1);
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padding_length++;
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}
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if (padding_length >= 3) {
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return false;
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}
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if ((!is_url || padding_length > 0) && ((input.size() + padding_length) & 3) != 0) {
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return false;
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}
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if (is_url && (input.size() & 3) == 1) {
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return false;
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}
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unsigned char *table;
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if (is_url) {
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init_base64url_table();
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table = url_char_to_value;
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} else {
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init_base64_table();
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table = char_to_value;
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}
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for (auto c : input) {
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if (table[static_cast<unsigned char>(c)] == 64) {
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return false;
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}
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}
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if ((input.size() & 3) == 2) {
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auto value = table[static_cast<int>(input.back())];
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if ((value & 15) != 0) {
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return false;
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}
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}
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if ((input.size() & 3) == 3) {
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auto value = table[static_cast<int>(input.back())];
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if ((value & 3) != 0) {
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return false;
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}
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}
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return true;
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}
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bool is_base64(Slice input) {
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return is_base64_impl<false>(input);
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}
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bool is_base64url(Slice input) {
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return is_base64_impl<true>(input);
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}
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string base64_filter(Slice input) {
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string res;
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res.reserve(input.size());
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init_base64_table();
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for (auto c : input) {
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if (char_to_value[static_cast<unsigned char>(c)] != 64 || c == '=') {
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res += c;
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}
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}
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return res;
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}
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} // namespace td
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