Remove //net (except for Android test stuff) and sdch

net/dns/dns_response.h

-// Copyright (c) 2012 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.
-
-#ifndef NET_DNS_DNS_RESPONSE_H_
-#define NET_DNS_DNS_RESPONSE_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/strings/string_piece.h"
-#include "base/time/time.h"
-#include "net/base/net_export.h"
-#include "net/base/net_util.h"
-
-namespace net {
-
-class AddressList;
-class DnsQuery;
-class IOBufferWithSize;
-
-namespace dns_protocol {
-struct Header;
-}
-
-// Parsed resource record.
-struct NET_EXPORT_PRIVATE DnsResourceRecord {
-  DnsResourceRecord();
-  ~DnsResourceRecord();
-
-  std::string name;  // in dotted form
-  uint16 type;
-  uint16 klass;
-  uint32 ttl;
-  base::StringPiece rdata;  // points to the original response buffer
-};
-
-// Iterator to walk over resource records of the DNS response packet.
-class NET_EXPORT_PRIVATE DnsRecordParser {
- public:
-  // Construct an uninitialized iterator.
-  DnsRecordParser();
-
-  // Construct an iterator to process the |packet| of given |length|.
-  // |offset| points to the beginning of the answer section.
-  DnsRecordParser(const void* packet, size_t length, size_t offset);
-
-  // Returns |true| if initialized.
-  bool IsValid() const { return packet_ != NULL; }
-
-  // Returns |true| if no more bytes remain in the packet.
-  bool AtEnd() const { return cur_ == packet_ + length_; }
-
-  // Returns current offset into the packet.
-  size_t GetOffset() const { return cur_ - packet_; }
-
-  // Parses a (possibly compressed) DNS name from the packet starting at
-  // |pos|. Stores output (even partial) in |out| unless |out| is NULL. |out|
-  // is stored in the dotted form, e.g., "example.com". Returns number of bytes
-  // consumed or 0 on failure.
-  // This is exposed to allow parsing compressed names within RRDATA for TYPEs
-  // such as NS, CNAME, PTR, MX, SOA.
-  // See RFC 1035 section 4.1.4.
-  unsigned ReadName(const void* pos, std::string* out) const;
-
-  // Parses the next resource record into |record|. Returns true if succeeded.
-  bool ReadRecord(DnsResourceRecord* record);
-
-  // Skip a question section, returns true if succeeded.
-  bool SkipQuestion();
-
- private:
-  const char* packet_;
-  size_t length_;
-  // Current offset within the packet.
-  const char* cur_;
-};
-
-// Buffer-holder for the DNS response allowing easy access to the header fields
-// and resource records. After reading into |io_buffer| must call InitParse to
-// position the RR parser.
-class NET_EXPORT_PRIVATE DnsResponse {
- public:
-  // Possible results from ParseToAddressList.
-  enum Result {
-    DNS_PARSE_OK = 0,
-    DNS_MALFORMED_RESPONSE,    // DnsRecordParser failed before the end of
-                               // packet.
-    DNS_MALFORMED_CNAME,       // Could not parse CNAME out of RRDATA.
-    DNS_NAME_MISMATCH,         // Got an address but no ordered chain of CNAMEs
-                               // leads there.
-    DNS_SIZE_MISMATCH,         // Got an address but size does not match.
-    DNS_CNAME_AFTER_ADDRESS,   // Found CNAME after an address record.
-    DNS_ADDRESS_TTL_MISMATCH,  // OBSOLETE. No longer used.
-    DNS_NO_ADDRESSES,          // OBSOLETE. No longer used.
-    // Only add new values here.
-    DNS_PARSE_RESULT_MAX,      // Bounding value for histograms.
-  };
-
-  // Constructs a response buffer large enough to store one byte more than
-  // largest possible response, to detect malformed responses.
-  DnsResponse();
-
-  // Constructs a response buffer of given length. Used for TCP transactions.
-  explicit DnsResponse(size_t length);
-
-  // Constructs a response from |data|. Used for testing purposes only!
-  DnsResponse(const void* data, size_t length, size_t answer_offset);
-
-  ~DnsResponse();
-
-  // Internal buffer accessor into which actual bytes of response will be
-  // read.
-  IOBufferWithSize* io_buffer() { return io_buffer_.get(); }
-
-  // Assuming the internal buffer holds |nbytes| bytes, returns true iff the
-  // packet matches the |query| id and question.
-  bool InitParse(int nbytes, const DnsQuery& query);
-
-  // Assuming the internal buffer holds |nbytes| bytes, initialize the parser
-  // without matching it against an existing query.
-  bool InitParseWithoutQuery(int nbytes);
-
-  // Returns true if response is valid, that is, after successful InitParse.
-  bool IsValid() const;
-
-  // All of the methods below are valid only if the response is valid.
-
-  // Accessors for the header.
-  uint16 flags() const;  // excluding rcode
-  uint8 rcode() const;
-
-  unsigned answer_count() const;
-  unsigned additional_answer_count() const;
-
-  // Accessors to the question. The qname is unparsed.
-  base::StringPiece qname() const;
-  uint16 qtype() const;
-
-  // Returns qname in dotted format.
-  std::string GetDottedName() const;
-
-  // Returns an iterator to the resource records in the answer section.
-  // The iterator is valid only in the scope of the DnsResponse.
-  // This operation is idempotent.
-  DnsRecordParser Parser() const;
-
-  // Extracts an AddressList from this response. Returns SUCCESS if succeeded.
-  // Otherwise returns a detailed error number.
-  Result ParseToAddressList(AddressList* addr_list, base::TimeDelta* ttl) const;
-
- private:
-  // Convenience for header access.
-  const dns_protocol::Header* header() const;
-
-  // Buffer into which response bytes are read.
-  scoped_refptr<IOBufferWithSize> io_buffer_;
-
-  // Iterator constructed after InitParse positioned at the answer section.
-  // It is never updated afterwards, so can be used in accessors.
-  DnsRecordParser parser_;
-
-  DISALLOW_COPY_AND_ASSIGN(DnsResponse);
-};
-
-}  // namespace net
-
-#endif  // NET_DNS_DNS_RESPONSE_H_