| // Copyright (c) 2011 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_BASE_MIME_SNIFFER_H__ |
| #define NET_BASE_MIME_SNIFFER_H__ |
| |
| #include <string> |
| |
| #include "net/base/net_export.h" |
| |
| class GURL; |
| |
| namespace net { |
| |
| // The maximum number of bytes used by any internal mime sniffing routine. May |
| // be useful for callers to determine an efficient buffer size to pass to |
| // |SniffMimeType|. |
| // This must be updated if any internal sniffing routine needs more bytes. |
| const int kMaxBytesToSniff = 1024; |
| |
| // Examine the URL and the mime_type and decide whether we should sniff a |
| // replacement mime type from the content. |
| // |
| // @param url The URL from which we obtained the content. |
| // @param mime_type The current mime type, e.g. from the Content-Type header. |
| // @return Returns true if we should sniff the mime type. |
| NET_EXPORT bool ShouldSniffMimeType(const GURL& url, |
| const std::string& mime_type); |
| |
| // Guess a mime type from the first few bytes of content an its URL. Always |
| // assigns |result| with its best guess of a mime type. |
| // |
| // @param content A buffer containing the bytes to sniff. |
| // @param content_size The number of bytes in the |content| buffer. |
| // @param url The URL from which we obtained this content. |
| // @param type_hint The current mime type, e.g. from the Content-Type header. |
| // @param result Address at which to place the sniffed mime type. |
| // @return Returns true if we have enough content to guess the mime type. |
| NET_EXPORT bool SniffMimeType(const char* content, size_t content_size, |
| const GURL& url, const std::string& type_hint, |
| std::string* result); |
| |
| // Attempt to identify a MIME type from the first few bytes of content only. |
| // Uses a bigger set of media file searches than |SniffMimeType()|. |
| // If finds a match, fills in |result| and returns true, |
| // otherwise returns false. |
| // |
| // The caller should understand the security ramifications of trusting |
| // uncontrolled data before accepting the results of this function. |
| // |
| // @param content A buffer containing the bytes to sniff. |
| // @param content_size The number of bytes in the |content| buffer. |
| // @param result Address at which to place the sniffed mime type. |
| // @return Returns true if a MIME type match was found. |
| NET_EXPORT bool SniffMimeTypeFromLocalData(const char* content, |
| size_t content_size, |
| std::string* result); |
| |
| // Returns true if |content| contains bytes that are control codes that do |
| // not usually appear in plain text. |
| // @param content A buffer contains bytes that may be binary. |
| // @param size The number of bytes in the |content| buffer. |
| // @return Returns true if |content| looks like binary. |
| NET_EXPORT_PRIVATE bool LooksLikeBinary(const char* content, size_t size); |
| |
| } // namespace net |
| |
| #endif // NET_BASE_MIME_SNIFFER_H__ |