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83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
// Copyright 2011 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_BASE_MIME_SNIFFER_H__
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#define NET_BASE_MIME_SNIFFER_H__
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#include <stddef.h>
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#include <string>
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#include <string_view>
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#include "net/base/net_export.h"
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class GURL;
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namespace net {
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// The maximum number of bytes used by any internal mime sniffing routine. May
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// be useful for callers to determine an efficient buffer size to pass to
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// |SniffMimeType|.
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// This must be updated if any internal sniffing routine needs more bytes.
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const int kMaxBytesToSniff = 1024;
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// Whether to force the MIME sniffer to sniff the contents of file URLs for
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// HTML. kDisabled is recommended.
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enum class ForceSniffFileUrlsForHtml {
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kDisabled,
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kEnabled,
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};
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// Examine the URL and the mime_type and decide whether to sniff a replacement
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// mime type from the content.
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//
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// |url| is the URL from which the content was obtained.
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// |mime_type| is the current mime type, e.g. from the Content-Type header.
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// Returns true if the mime type should be sniffed.
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NET_EXPORT bool ShouldSniffMimeType(const GURL& url,
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std::string_view mime_type);
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// Guess a mime type from the first few bytes of content an its URL. Always
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// assigns |result| with its best guess of a mime type.
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//
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// |content| contains the bytes to sniff.
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// |url| is the URL from which the content was obtained.
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// |type_hint| is the current mime type, e.g. from the Content-Type header.
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// |result| is the address at which to place the sniffed mime type.
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// If |force_sniff_file_url_for_html| is enabled, the contents of |file| URLs
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// will be sniffed to see if they contain HTML. It is recommended this be
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// disabled.
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//
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// Returns true if |content| had enough data to guess the mime type. Otherwise,
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// |result| will be populated with a putative MIME type, but the method should
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// be called again with more of the content.
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NET_EXPORT bool SniffMimeType(
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std::string_view content,
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const GURL& url,
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const std::string& type_hint,
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ForceSniffFileUrlsForHtml force_sniff_file_url_for_html,
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std::string* result);
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// Attempt to identify a MIME type from the first few bytes of content only.
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// Uses a bigger set of media file searches than |SniffMimeType()|.
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// If finds a match, fills in |result| and returns true,
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// otherwise returns false.
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//
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// The caller should understand the security ramifications of trusting
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// uncontrolled data before accepting the results of this function.
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//
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// |content| contains the bytes to sniff.
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// |result| is address at which to place the sniffed mime type.
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// Returns true if a MIME type match was found.
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NET_EXPORT bool SniffMimeTypeFromLocalData(std::string_view content,
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std::string* result);
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// Returns true if |content| contains bytes that are control codes that do
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// not usually appear in plain text.
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NET_EXPORT_PRIVATE bool LooksLikeBinary(std::string_view content);
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} // namespace net
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#endif // NET_BASE_MIME_SNIFFER_H__
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