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1 // Copyright (c) 2011 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 #ifndef NET_BASE_MIME_SNIFFER_H__ | |
6 #define NET_BASE_MIME_SNIFFER_H__ | |
7 | |
8 #include <string> | |
9 | |
10 #include "net/base/net_export.h" | |
11 | |
12 class GURL; | |
13 | |
14 namespace net { | |
15 | |
16 // The maximum number of bytes used by any internal mime sniffing routine. May | |
17 // be useful for callers to determine an efficient buffer size to pass to | |
18 // |SniffMimeType|. | |
19 // This must be updated if any internal sniffing routine needs more bytes. | |
20 const int kMaxBytesToSniff = 1024; | |
21 | |
22 // Examine the URL and the mime_type and decide whether we should sniff a | |
23 // replacement mime type from the content. | |
24 // | |
25 // @param url The URL from which we obtained the content. | |
26 // @param mime_type The current mime type, e.g. from the Content-Type header. | |
27 // @return Returns true if we should sniff the mime type. | |
28 NET_EXPORT bool ShouldSniffMimeType(const GURL& url, | |
29 const std::string& mime_type); | |
30 | |
31 // Guess a mime type from the first few bytes of content an its URL. Always | |
32 // assigns |result| with its best guess of a mime type. | |
33 // | |
34 // @param content A buffer containing the bytes to sniff. | |
35 // @param content_size The number of bytes in the |content| buffer. | |
36 // @param url The URL from which we obtained this content. | |
37 // @param type_hint The current mime type, e.g. from the Content-Type header. | |
38 // @param result Address at which to place the sniffed mime type. | |
39 // @return Returns true if we have enough content to guess the mime type. | |
40 NET_EXPORT bool SniffMimeType(const char* content, size_t content_size, | |
41 const GURL& url, const std::string& type_hint, | |
42 std::string* result); | |
43 | |
44 // Attempt to identify a MIME type from the first few bytes of content only. | |
45 // Uses a bigger set of media file searches than |SniffMimeType()|. | |
46 // If finds a match, fills in |result| and returns true, | |
47 // otherwise returns false. | |
48 // | |
49 // The caller should understand the security ramifications of trusting | |
50 // uncontrolled data before accepting the results of this function. | |
51 // | |
52 // @param content A buffer containing the bytes to sniff. | |
53 // @param content_size The number of bytes in the |content| buffer. | |
54 // @param result Address at which to place the sniffed mime type. | |
55 // @return Returns true if a MIME type match was found. | |
56 NET_EXPORT bool SniffMimeTypeFromLocalData(const char* content, | |
57 size_t content_size, | |
58 std::string* result); | |
59 | |
60 } // namespace net | |
61 | |
62 #endif // NET_BASE_MIME_SNIFFER_H__ | |
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