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

Issue 266243004: Clang format slam. Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 7 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 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_FILTER_GZIP_HEADER_H_ 15 #ifndef NET_FILTER_GZIP_HEADER_H_
16 #define NET_FILTER_GZIP_HEADER_H_ 16 #define NET_FILTER_GZIP_HEADER_H_
17 17
18 #include "base/basictypes.h" 18 #include "base/basictypes.h"
19 19
20 namespace net { 20 namespace net {
21 21
22 class GZipHeader { 22 class GZipHeader {
23 public: 23 public:
24 enum Status { 24 enum Status {
25 INCOMPLETE_HEADER, // don't have all the bits yet... 25 INCOMPLETE_HEADER, // don't have all the bits yet...
26 COMPLETE_HEADER, // complete, valid header 26 COMPLETE_HEADER, // complete, valid header
27 INVALID_HEADER, // found something invalid in the header 27 INVALID_HEADER, // found something invalid in the header
28 }; 28 };
29 29
30 GZipHeader(); 30 GZipHeader();
31 ~GZipHeader(); 31 ~GZipHeader();
32 32
33 // Wipe the slate clean and start from scratch. 33 // Wipe the slate clean and start from scratch.
34 void Reset(); 34 void Reset();
35 35
36 // Attempt to parse the given buffer as the next installment of 36 // Attempt to parse the given buffer as the next installment of
37 // bytes from a gzip header. If the bytes we've seen so far do not 37 // bytes from a gzip header. If the bytes we've seen so far do not
38 // yet constitute a complete gzip header, return 38 // yet constitute a complete gzip header, return
39 // INCOMPLETE_HEADER. If these bytes do not constitute a *valid* 39 // INCOMPLETE_HEADER. If these bytes do not constitute a *valid*
40 // gzip header, return INVALID_HEADER. When we've seen a complete 40 // gzip header, return INVALID_HEADER. When we've seen a complete
41 // gzip header, return COMPLETE_HEADER and set the pointer pointed 41 // gzip header, return COMPLETE_HEADER and set the pointer pointed
42 // to by header_end to the first byte beyond the gzip header. 42 // to by header_end to the first byte beyond the gzip header.
43 Status ReadMore(const char* inbuf, 43 Status ReadMore(const char* inbuf, int inbuf_len, const char** header_end);
44 int inbuf_len, 44
45 const char** header_end);
46 private: 45 private:
47 enum { // flags (see RFC) 46 enum { // flags (see RFC)
48 FLAG_FTEXT = 0x01, // bit 0 set: file probably ascii text 47 FLAG_FTEXT = 0x01, // bit 0 set: file probably ascii text
49 FLAG_FHCRC = 0x02, // bit 1 set: header CRC present 48 FLAG_FHCRC = 0x02, // bit 1 set: header CRC present
50 FLAG_FEXTRA = 0x04, // bit 2 set: extra field present 49 FLAG_FEXTRA = 0x04, // bit 2 set: extra field present
51 FLAG_FNAME = 0x08, // bit 3 set: original file name present 50 FLAG_FNAME = 0x08, // bit 3 set: original file name present
52 FLAG_FCOMMENT = 0x10, // bit 4 set: file comment present 51 FLAG_FCOMMENT = 0x10, // bit 4 set: file comment present
53 FLAG_RESERVED = 0xE0, // bits 5..7: reserved 52 FLAG_RESERVED = 0xE0, // bits 5..7: reserved
54 }; 53 };
55 54
56 enum State { 55 enum State {
57 // The first 10 bytes are the fixed-size header: 56 // The first 10 bytes are the fixed-size header:
58 IN_HEADER_ID1, 57 IN_HEADER_ID1,
59 IN_HEADER_ID2, 58 IN_HEADER_ID2,
60 IN_HEADER_CM, 59 IN_HEADER_CM,
61 IN_HEADER_FLG, 60 IN_HEADER_FLG,
62 IN_HEADER_MTIME_BYTE_0, 61 IN_HEADER_MTIME_BYTE_0,
63 IN_HEADER_MTIME_BYTE_1, 62 IN_HEADER_MTIME_BYTE_1,
64 IN_HEADER_MTIME_BYTE_2, 63 IN_HEADER_MTIME_BYTE_2,
65 IN_HEADER_MTIME_BYTE_3, 64 IN_HEADER_MTIME_BYTE_3,
66 IN_HEADER_XFL, 65 IN_HEADER_XFL,
67 IN_HEADER_OS, 66 IN_HEADER_OS,
68
69 IN_XLEN_BYTE_0, 67 IN_XLEN_BYTE_0,
70 IN_XLEN_BYTE_1, 68 IN_XLEN_BYTE_1,
71 IN_FEXTRA, 69 IN_FEXTRA,
72
73 IN_FNAME, 70 IN_FNAME,
74
75 IN_FCOMMENT, 71 IN_FCOMMENT,
76
77 IN_FHCRC_BYTE_0, 72 IN_FHCRC_BYTE_0,
78 IN_FHCRC_BYTE_1, 73 IN_FHCRC_BYTE_1,
79
80 IN_DONE, 74 IN_DONE,
81 }; 75 };
82 76
83 static const uint8 magic[]; // gzip magic header 77 static const uint8 magic[]; // gzip magic header
84 78
85 int state_; // our current State in the parsing FSM: an int so we can ++ 79 int state_; // our current State in the parsing FSM: an int so we can ++
86 uint8 flags_; // the flags byte of the header ("FLG" in the RFC) 80 uint8 flags_; // the flags byte of the header ("FLG" in the RFC)
87 uint16 extra_length_; // how much of the "extra field" we have yet to read 81 uint16 extra_length_; // how much of the "extra field" we have yet to read
88 82
89 DISALLOW_COPY_AND_ASSIGN(GZipHeader); 83 DISALLOW_COPY_AND_ASSIGN(GZipHeader);
90 }; 84 };
91 85
92 } // namespace net 86 } // namespace net
93 87
94 #endif // NET_FILTER_GZIP_HEADER_H_ 88 #endif // NET_FILTER_GZIP_HEADER_H_
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