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Side by Side Diff: net/base/gzip_header.h

Issue 6085013: Start reordering the methods in headers in net/. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 9 years, 11 months ago
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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // The GZipHeader class allows you to parse a gzip header, such as you 5 // The GZipHeader class allows you to parse a gzip header, such as you
6 // might find at the beginning of a file compressed by gzip (ie, a .gz 6 // might find at the beginning of a file compressed by gzip (ie, a .gz
7 // file), or at the beginning of an HTTP response that uses a gzip 7 // file), or at the beginning of an HTTP response that uses a gzip
8 // Content-Encoding. See RFC 1952 for the specification for the gzip 8 // Content-Encoding. See RFC 1952 for the specification for the gzip
9 // header. 9 // header.
10 // 10 //
11 // The model is that you call ReadMore() for each chunk of bytes 11 // The model is that you call ReadMore() for each chunk of bytes
12 // you've read from a file or socket. 12 // you've read from a file or socket.
13 // 13 //
14 14
15 #ifndef NET_BASE_GZIP_HEADER_H_ 15 #ifndef NET_BASE_GZIP_HEADER_H_
16 #define NET_BASE_GZIP_HEADER_H_ 16 #define NET_BASE_GZIP_HEADER_H_
17 #pragma once 17 #pragma once
18 18
19 #include "base/basictypes.h" 19 #include "base/basictypes.h"
20 20
21 class GZipHeader { 21 class GZipHeader {
22 public: 22 public:
23 enum Status {
24 INCOMPLETE_HEADER, // don't have all the bits yet...
25 COMPLETE_HEADER, // complete, valid header
26 INVALID_HEADER, // found something invalid in the header
27 };
28
23 GZipHeader() { 29 GZipHeader() {
24 Reset(); 30 Reset();
25 } 31 }
32
26 ~GZipHeader() { 33 ~GZipHeader() {
27 } 34 }
28 35
29 // Wipe the slate clean and start from scratch. 36 // Wipe the slate clean and start from scratch.
30 void Reset() { 37 void Reset() {
31 state_ = IN_HEADER_ID1; 38 state_ = IN_HEADER_ID1;
32 flags_ = 0; 39 flags_ = 0;
33 extra_length_ = 0; 40 extra_length_ = 0;
34 } 41 }
35 42
36 enum Status {
37 INCOMPLETE_HEADER, // don't have all the bits yet...
38 COMPLETE_HEADER, // complete, valid header
39 INVALID_HEADER, // found something invalid in the header
40 };
41
42 // Attempt to parse the given buffer as the next installment of 43 // Attempt to parse the given buffer as the next installment of
43 // bytes from a gzip header. If the bytes we've seen so far do not 44 // bytes from a gzip header. If the bytes we've seen so far do not
44 // yet constitute a complete gzip header, return 45 // yet constitute a complete gzip header, return
45 // INCOMPLETE_HEADER. If these bytes do not constitute a *valid* 46 // INCOMPLETE_HEADER. If these bytes do not constitute a *valid*
46 // gzip header, return INVALID_HEADER. When we've seen a complete 47 // gzip header, return INVALID_HEADER. When we've seen a complete
47 // gzip header, return COMPLETE_HEADER and set the pointer pointed 48 // gzip header, return COMPLETE_HEADER and set the pointer pointed
48 // to by header_end to the first byte beyond the gzip header. 49 // to by header_end to the first byte beyond the gzip header.
49 Status ReadMore(const char* inbuf, int inbuf_len, 50 Status ReadMore(const char* inbuf, int inbuf_len,
50 const char** header_end); 51 const char** header_end);
51 private: 52 private:
52
53 static const uint8 magic[]; // gzip magic header
54
55 enum { // flags (see RFC) 53 enum { // flags (see RFC)
56 FLAG_FTEXT = 0x01, // bit 0 set: file probably ascii text 54 FLAG_FTEXT = 0x01, // bit 0 set: file probably ascii text
57 FLAG_FHCRC = 0x02, // bit 1 set: header CRC present 55 FLAG_FHCRC = 0x02, // bit 1 set: header CRC present
58 FLAG_FEXTRA = 0x04, // bit 2 set: extra field present 56 FLAG_FEXTRA = 0x04, // bit 2 set: extra field present
59 FLAG_FNAME = 0x08, // bit 3 set: original file name present 57 FLAG_FNAME = 0x08, // bit 3 set: original file name present
60 FLAG_FCOMMENT = 0x10, // bit 4 set: file comment present 58 FLAG_FCOMMENT = 0x10, // bit 4 set: file comment present
61 FLAG_RESERVED = 0xE0, // bits 5..7: reserved 59 FLAG_RESERVED = 0xE0, // bits 5..7: reserved
62 }; 60 };
63 61
64 enum State { 62 enum State {
(...skipping 16 matching lines...) Expand all
81 IN_FNAME, 79 IN_FNAME,
82 80
83 IN_FCOMMENT, 81 IN_FCOMMENT,
84 82
85 IN_FHCRC_BYTE_0, 83 IN_FHCRC_BYTE_0,
86 IN_FHCRC_BYTE_1, 84 IN_FHCRC_BYTE_1,
87 85
88 IN_DONE, 86 IN_DONE,
89 }; 87 };
90 88
89 static const uint8 magic[]; // gzip magic header
90
91 int state_; // our current State in the parsing FSM: an int so we can ++ 91 int state_; // our current State in the parsing FSM: an int so we can ++
92 uint8 flags_; // the flags byte of the header ("FLG" in the RFC) 92 uint8 flags_; // the flags byte of the header ("FLG" in the RFC)
93 uint16 extra_length_; // how much of the "extra field" we have yet to read 93 uint16 extra_length_; // how much of the "extra field" we have yet to read
94 }; 94 };
95 95
96 #endif // NET_BASE_GZIP_HEADER_H_ 96 #endif // NET_BASE_GZIP_HEADER_H_
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