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// Copyright 2013 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.
// Utility class that performs basic operations on header value tokens: parsing
// them out, checking for presense of certain tokens, and removing them.
#include "base/strings/string_piece.h"
#include "net/tools/balsa/balsa_headers.h"
namespace net {
class BalsaHeadersTokenUtils {
// All the functions below respect multiple header lines with the same key.
// Checks whether the last header token matches a given value. Useful to
// check the outer-most content or transfer-encoding, for example. In the
// presence of multiple header lines with given key, the last token of the
// last line is compared.
static bool CheckHeaderForLastToken(const BalsaHeaders& headers,
const base::StringPiece& key,
const base::StringPiece& token);
// Tokenizes header value for a given key. In the presence of multiple lines
// with that key, all of them will be tokenized and tokens will be added to
// the list in the order in which they are encountered.
static void TokenizeHeaderValue(const BalsaHeaders& headers,
const base::StringPiece& key,
BalsaHeaders::HeaderTokenList* tokens);
// Removes the last token from the header value. In the presence of multiple
// header lines with given key, will remove the last token of the last line.
// Can be useful if the last encoding has to be removed.
static void RemoveLastTokenFromHeaderValue(const base::StringPiece& key,
BalsaHeaders* headers);
// Given a pointer to the beginning and the end of the header value
// in some buffer, populates tokens list with beginning and end indices
// of all tokens present in the value string.
static void ParseTokenList(const char* start,
const char* end,
BalsaHeaders::HeaderTokenList* tokens);
// Helper function to tokenize a header line once we have its description.
static void TokenizeHeaderLine(
const BalsaHeaders& headers,
const BalsaHeaders::HeaderLineDescription& line,
BalsaHeaders::HeaderTokenList* tokens);
BalsaHeadersTokenUtils(); // Prohibit instantiation
} // namespace net