1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Utility class that performs basic operations on header value tokens: parsing 6 // them out, checking for presense of certain tokens, and removing them. 7 8 #ifndef NET_TOOLS_BALSA_BALSA_HEADERS_TOKEN_UTILS_H_ 9 #define NET_TOOLS_BALSA_BALSA_HEADERS_TOKEN_UTILS_H_ 10 11 #include "base/strings/string_piece.h" 12 #include "net/tools/balsa/balsa_headers.h" 13 14 namespace net { 15 16 class BalsaHeadersTokenUtils { 17 public: 18 // All the functions below respect multiple header lines with the same key. 19 20 // Checks whether the last header token matches a given value. Useful to 21 // check the outer-most content or transfer-encoding, for example. In the 22 // presence of multiple header lines with given key, the last token of the 23 // last line is compared. 24 static bool CheckHeaderForLastToken(const BalsaHeaders& headers, 25 const base::StringPiece& key, 26 const base::StringPiece& token); 27 28 // Tokenizes header value for a given key. In the presence of multiple lines 29 // with that key, all of them will be tokenized and tokens will be added to 30 // the list in the order in which they are encountered. 31 static void TokenizeHeaderValue(const BalsaHeaders& headers, 32 const base::StringPiece& key, 33 BalsaHeaders::HeaderTokenList* tokens); 34 35 // Removes the last token from the header value. In the presence of multiple 36 // header lines with given key, will remove the last token of the last line. 37 // Can be useful if the last encoding has to be removed. 38 static void RemoveLastTokenFromHeaderValue(const base::StringPiece& key, 39 BalsaHeaders* headers); 40 41 // Given a pointer to the beginning and the end of the header value 42 // in some buffer, populates tokens list with beginning and end indices 43 // of all tokens present in the value string. 44 static void ParseTokenList(const char* start, 45 const char* end, 46 BalsaHeaders::HeaderTokenList* tokens); 47 48 private: 49 // Helper function to tokenize a header line once we have its description. 50 static void TokenizeHeaderLine( 51 const BalsaHeaders& headers, 52 const BalsaHeaders::HeaderLineDescription& line, 53 BalsaHeaders::HeaderTokenList* tokens); 54 55 BalsaHeadersTokenUtils(); // Prohibit instantiation 56 }; 57 58 } // namespace net 59 60 #endif // NET_TOOLS_BALSA_BALSA_HEADERS_TOKEN_UTILS_H_ 61 62
