зеркало из https://github.com/mozilla/gecko-dev.git
138 строки
4.4 KiB
C++
138 строки
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsUnknownDecoder_h__
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#define nsUnknownDecoder_h__
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#include "nsIStreamConverter.h"
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#include "nsIChannel.h"
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#include "nsIContentSniffer.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#define NS_UNKNOWNDECODER_CID \
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{ /* 7d7008a0-c49a-11d3-9b22-0080c7cb1080 */ \
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0x7d7008a0, \
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0xc49a, \
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0x11d3, \
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{0x9b, 0x22, 0x00, 0x80, 0xc7, 0xcb, 0x10, 0x80} \
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}
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class nsUnknownDecoder : public nsIStreamConverter, public nsIContentSniffer
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{
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public:
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// nsISupports methods
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NS_DECL_ISUPPORTS
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// nsIStreamConverter methods
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NS_DECL_NSISTREAMCONVERTER
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// nsIStreamListener methods
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NS_DECL_NSISTREAMLISTENER
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// nsIRequestObserver methods
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NS_DECL_NSIREQUESTOBSERVER
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// nsIContentSniffer methods
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NS_DECL_NSICONTENTSNIFFER
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nsUnknownDecoder();
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protected:
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virtual ~nsUnknownDecoder();
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virtual void DetermineContentType(nsIRequest* aRequest);
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nsresult FireListenerNotifications(nsIRequest* request, nsISupports *aCtxt);
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protected:
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nsCOMPtr<nsIStreamListener> mNextListener;
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// Function to use to check whether sniffing some potentially
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// dangerous types (eg HTML) is ok for this request. We can disable
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// sniffing for local files if needed using this. Just a security
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// precation thingy... who knows when we suddenly need to flip this
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// pref?
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bool AllowSniffing(nsIRequest* aRequest);
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// Various sniffer functions. Returning true means that a type
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// was determined; false means no luck.
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bool TryContentSniffers(nsIRequest* aRequest);
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bool SniffForHTML(nsIRequest* aRequest);
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bool SniffForXML(nsIRequest* aRequest);
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// SniffURI guesses at the content type based on the URI (typically
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// using the extentsion)
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bool SniffURI(nsIRequest* aRequest);
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// LastDitchSniff guesses at text/plain vs. application/octet-stream
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// by just looking at whether the data contains null bytes, and
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// maybe at the fraction of chars with high bit set. Use this only
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// as a last-ditch attempt to decide a content type!
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bool LastDitchSniff(nsIRequest* aRequest);
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/**
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* An entry struct for our array of sniffers. Each entry has either
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* a type associated with it (set these with the SNIFFER_ENTRY macro)
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* or a function to be executed (set these with the
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* SNIFFER_ENTRY_WITH_FUNC macro). The function should take a single
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* nsIRequest* and returns bool -- true if it sets mContentType,
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* false otherwise
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*/
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struct nsSnifferEntry {
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typedef bool (nsUnknownDecoder::*TypeSniffFunc)(nsIRequest* aRequest);
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const char* mBytes;
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PRUint32 mByteLen;
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// Exactly one of mMimeType and mContentTypeSniffer should be set non-null
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const char* mMimeType;
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TypeSniffFunc mContentTypeSniffer;
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};
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#define SNIFFER_ENTRY(_bytes, _type) \
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{ _bytes, sizeof(_bytes) - 1, _type, nsnull }
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#define SNIFFER_ENTRY_WITH_FUNC(_bytes, _func) \
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{ _bytes, sizeof(_bytes) - 1, nsnull, _func }
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static nsSnifferEntry sSnifferEntries[];
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static PRUint32 sSnifferEntryNum;
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char *mBuffer;
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PRUint32 mBufferLen;
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bool mRequireHTMLsuffix;
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nsCString mContentType;
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};
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#define NS_BINARYDETECTOR_CID \
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{ /* a2027ec6-ba0d-4c72-805d-148233f5f33c */ \
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0xa2027ec6, \
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0xba0d, \
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0x4c72, \
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{0x80, 0x5d, 0x14, 0x82, 0x33, 0xf5, 0xf3, 0x3c} \
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}
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/**
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* Class that detects whether a data stream is text or binary. This reuses
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* most of nsUnknownDecoder except the actual content-type determination logic
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* -- our overridden DetermineContentType simply calls LastDitchSniff and sets
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* the type to APPLICATION_GUESS_FROM_EXT if the data is detected as binary.
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*/
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class nsBinaryDetector : public nsUnknownDecoder
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{
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protected:
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virtual void DetermineContentType(nsIRequest* aRequest);
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};
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#define NS_BINARYDETECTOR_CATEGORYENTRY \
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{ NS_CONTENT_SNIFFER_CATEGORY, "Binary Detector", NS_BINARYDETECTOR_CONTRACTID }
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#endif /* nsUnknownDecoder_h__ */
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