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Export of internal Abseil changes

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9beb68204986a015c9cb065b9fae4f9a8879a788 by Abseil Team <absl-team@google.com>:

Move Base64EscapeInternal and CalculateBase64EscapedLenInternal to an internal header.

PiperOrigin-RevId: 288917378

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90acfbe03b3f9f6de3ffa49c39343dfaa2c5d38c by Greg Falcon <gfalcon@google.com>:

Update macos CI script to support the ALTERNATE_OPTIONS environment variable.

PiperOrigin-RevId: 288913564

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f1572e870678cdcda6b48cb39780d1ad984e4c1b by Derek Mauro <dmauro@google.com>:

Makes absl::NullSafeStringView constexpr
Fixes https://github.com/abseil/abseil-cpp/issues/583

PiperOrigin-RevId: 288906940

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d28a8471e32c10caa64bfffe6d6d4d0a8d144013 by Abseil Team <absl-team@google.com>:

absl::GetFlag is lock free for small trivially copyable types.

PiperOrigin-RevId: 288768172

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2643b8ed1a1dc836b38ab9e46538a1af129ffd67 by Gennadiy Rozental <rogeeff@google.com>:

Eliminate call to callback from flag initialization.

We do not need to have this invocation inside FlagImpl::Init since SetCallback performs invocation anyways. Calling InitCallback from inside of Init complicates separation of value initialization from data guard initialization, which is about to happen.

PiperOrigin-RevId: 288732526

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22caa880b7a4cb6da34e16a2e064a473c99e880b by Abseil Team <absl-team@google.com>:

Fix the documentation on how to create a null string_view.

PiperOrigin-RevId: 288727968

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10727c5cadc561837141176f4c9b9717cec9233a by Greg Falcon <gfalcon@google.com>:

Change CI scripts for gcc to use the ALTERNATE_OPTIONS file as well.

PiperOrigin-RevId: 288718855

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5d1e2dd6c7fb12af8aa4337a0f61872f5f0c5992 by Greg Falcon <gfalcon@google.com>:

Add an option for using inline namespaces in Abseil.

PiperOrigin-RevId: 288614491
GitOrigin-RevId: 9beb68204986a015c9cb065b9fae4f9a8879a788
Change-Id: If9acd46301e3df8cb231b4c16f7ed651bf4fb3c3
This commit is contained in:
Abseil Team 2020-01-09 09:58:48 -08:00 • committed by Derek Mauro
parent 63ee2f8877
commit b3aaac8a37
19 changed files with 527 additions and 255 deletions
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58
absl/strings/internal/escaping.h Normal file
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// Copyright 2020 The Abseil Authors.
//
// 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
//
// https://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 ABSL_STRINGS_INTERNAL_ESCAPING_H_
#define ABSL_STRINGS_INTERNAL_ESCAPING_H_
#include <cassert>
#include "absl/strings/internal/resize_uninitialized.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace strings_internal {
ABSL_CONST_INIT extern const char kBase64Chars[];
// Calculates how long a string will be when it is base64 encoded given its
// length and whether or not the result should be padded.
size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding);
// Base64-encodes `src` using the alphabet provided in `base64` and writes the
// result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars
// until its length is a multiple of 3. Returns the length of `dest`.
size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest,
size_t szdest, const char* base64, bool do_padding);
// Base64-encodes `src` using the alphabet provided in `base64` and writes the
// result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars
// until its length is a multiple of 3.
template <typename String>
void Base64EscapeInternal(const unsigned char* src, size_t szsrc, String* dest,
bool do_padding, const char* base64_chars) {
const size_t calc_escaped_size =
CalculateBase64EscapedLenInternal(szsrc, do_padding);
STLStringResizeUninitialized(dest, calc_escaped_size);
const size_t escaped_len = Base64EscapeInternal(
src, szsrc, &(*dest)[0], dest->size(), base64_chars, do_padding);
assert(calc_escaped_size == escaped_len);
dest->erase(escaped_len);
}
} // namespace strings_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_STRINGS_INTERNAL_ESCAPING_H_