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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 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 | 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 // Detecting mime types is a tricky business because we need to balance | 5 // Detecting mime types is a tricky business because we need to balance |
6 // compatibility concerns with security issues. Here is a survey of how other | 6 // compatibility concerns with security issues. Here is a survey of how other |
7 // browsers behave and then a description of how we intend to behave. | 7 // browsers behave and then a description of how we intend to behave. |
8 // | 8 // |
9 // HTML payload, no Content-Type header: | 9 // HTML payload, no Content-Type header: |
10 // * IE 7: Render as HTML | 10 // * IE 7: Render as HTML |
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556 return true; | 556 return true; |
557 } | 557 } |
558 | 558 |
559 bool ShouldSniffMimeType(const GURL& url, const std::string& mime_type) { | 559 bool ShouldSniffMimeType(const GURL& url, const std::string& mime_type) { |
560 static scoped_refptr<base::Histogram> should_sniff_counter = | 560 static scoped_refptr<base::Histogram> should_sniff_counter = |
561 UMASnifferHistogramGet("mime_sniffer.ShouldSniffMimeType2", 3); | 561 UMASnifferHistogramGet("mime_sniffer.ShouldSniffMimeType2", 3); |
562 // We are willing to sniff the mime type for HTTP, HTTPS, and FTP | 562 // We are willing to sniff the mime type for HTTP, HTTPS, and FTP |
563 bool sniffable_scheme = url.is_empty() || | 563 bool sniffable_scheme = url.is_empty() || |
564 url.SchemeIs("http") || | 564 url.SchemeIs("http") || |
565 url.SchemeIs("https") || | 565 url.SchemeIs("https") || |
| 566 url.SchemeIs("httpsv") || |
566 url.SchemeIs("ftp") || | 567 url.SchemeIs("ftp") || |
567 url.SchemeIsFile(); | 568 url.SchemeIsFile(); |
568 if (!sniffable_scheme) { | 569 if (!sniffable_scheme) { |
569 should_sniff_counter->Add(1); | 570 should_sniff_counter->Add(1); |
570 return false; | 571 return false; |
571 } | 572 } |
572 | 573 |
573 static const char* kSniffableTypes[] = { | 574 static const char* kSniffableTypes[] = { |
574 // Many web servers are misconfigured to send text/plain for many | 575 // Many web servers are misconfigured to send text/plain for many |
575 // different types of content. | 576 // different types of content. |
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671 // Now we look in our large table of magic numbers to see if we can find | 672 // Now we look in our large table of magic numbers to see if we can find |
672 // anything that matches the content. | 673 // anything that matches the content. |
673 if (SniffForMagicNumbers(content, content_size, | 674 if (SniffForMagicNumbers(content, content_size, |
674 &have_enough_content, result)) | 675 &have_enough_content, result)) |
675 return true; // We've matched a magic number. No more content needed. | 676 return true; // We've matched a magic number. No more content needed. |
676 | 677 |
677 return have_enough_content; | 678 return have_enough_content; |
678 } | 679 } |
679 | 680 |
680 } // namespace net | 681 } // namespace net |
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