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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "absl/hash/hash.h"
#include "absl/strings/ascii.h"
#include "absl/strings/escaping.h"
#include "absl/strings/match.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "common/platform/api/quiche_export.h"
namespace quiche {
struct QUICHE_EXPORT_PRIVATE StringPieceCaseHash {
size_t operator()(absl::string_view data) const {
std::string lower = absl::AsciiStrToLower(data);
absl::Hash<absl::string_view> hasher;
return hasher(lower);
struct QUICHE_EXPORT_PRIVATE StringPieceCaseEqual {
bool operator()(absl::string_view piece1, absl::string_view piece2) const {
return absl::EqualsIgnoreCase(piece1, piece2);
// Various utilities for manipulating text.
class QUICHE_EXPORT_PRIVATE QuicheTextUtils {
// Returns a new string in which |data| has been converted to lower case.
static std::string ToLower(absl::string_view data) {
return absl::AsciiStrToLower(data);
// Removes leading and trailing whitespace from |data|.
static void RemoveLeadingAndTrailingWhitespace(absl::string_view* data) {
*data = absl::StripAsciiWhitespace(*data);
// Base64 encodes with no padding |data_len| bytes of |data| into |output|.
static void Base64Encode(const uint8_t* data,
size_t data_len,
std::string* output);
// Decodes a base64-encoded |input|. Returns nullopt when the input is
// invalid.
static absl::optional<std::string> Base64Decode(absl::string_view input);
// Returns a string containing hex and ASCII representations of |binary|,
// side-by-side in the style of hexdump. Non-printable characters will be
// printed as '.' in the ASCII output.
// For example, given the input "Hello, QUIC!\01\02\03\04", returns:
// "0x0000: 4865 6c6c 6f2c 2051 5549 4321 0102 0304 Hello,.QUIC!...."
static std::string HexDump(absl::string_view binary_data);
// Returns true if |data| contains any uppercase characters.
static bool ContainsUpperCase(absl::string_view data) {
return std::any_of(data.begin(), data.end(), absl::ascii_isupper);
// Returns true if |data| contains only decimal digits.
static bool IsAllDigits(absl::string_view data) {
return std::all_of(data.begin(), data.end(), absl::ascii_isdigit);
} // namespace quiche