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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /netwerk/streamconv/converters/nsUnknownDecoder.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'netwerk/streamconv/converters/nsUnknownDecoder.h')
-rw-r--r--netwerk/streamconv/converters/nsUnknownDecoder.h152
1 files changed, 152 insertions, 0 deletions
diff --git a/netwerk/streamconv/converters/nsUnknownDecoder.h b/netwerk/streamconv/converters/nsUnknownDecoder.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsUnknownDecoder_h__
+#define nsUnknownDecoder_h__
+
+#include "nsIStreamConverter.h"
+#include "nsIThreadRetargetableStreamListener.h"
+#include "nsIContentSniffer.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/Atomics.h"
+
+#include "nsCOMPtr.h"
+#include "nsString.h"
+
+#define NS_UNKNOWNDECODER_CID \
+ { /* 7d7008a0-c49a-11d3-9b22-0080c7cb1080 */ \
+ 0x7d7008a0, 0xc49a, 0x11d3, { \
+ 0x9b, 0x22, 0x00, 0x80, 0xc7, 0xcb, 0x10, 0x80 \
+ } \
+ }
+
+class nsUnknownDecoder : public nsIStreamConverter,
+ public nsIContentSniffer,
+ public nsIThreadRetargetableStreamListener {
+ public:
+ // nsISupports methods
+ NS_DECL_ISUPPORTS
+
+ // nsIStreamConverter methods
+ NS_DECL_NSISTREAMCONVERTER
+
+ // nsIStreamListener methods
+ NS_DECL_NSISTREAMLISTENER
+
+ // nsIRequestObserver methods
+ NS_DECL_NSIREQUESTOBSERVER
+
+ // nsIContentSniffer methods
+ NS_DECL_NSICONTENTSNIFFER
+
+ // nsIThreadRetargetableStreamListener methods
+ NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
+
+ explicit nsUnknownDecoder(nsIStreamListener* aListener = nullptr);
+
+ protected:
+ virtual ~nsUnknownDecoder();
+
+ virtual void DetermineContentType(nsIRequest* aRequest);
+ nsresult FireListenerNotifications(nsIRequest* request, nsISupports* aCtxt);
+
+ class ConvertedStreamListener : public nsIStreamListener {
+ public:
+ explicit ConvertedStreamListener(nsUnknownDecoder* aDecoder);
+
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIREQUESTOBSERVER
+ NS_DECL_NSISTREAMLISTENER
+
+ private:
+ virtual ~ConvertedStreamListener() = default;
+ static nsresult AppendDataToString(nsIInputStream* inputStream,
+ void* closure, const char* rawSegment,
+ uint32_t toOffset, uint32_t count,
+ uint32_t* writeCount);
+ nsUnknownDecoder* mDecoder;
+ };
+
+ protected:
+ nsCOMPtr<nsIStreamListener> mNextListener;
+
+ // Various sniffer functions. Returning true means that a type
+ // was determined; false means no luck.
+ bool SniffForHTML(nsIRequest* aRequest);
+ bool SniffForXML(nsIRequest* aRequest);
+
+ // SniffURI guesses at the content type based on the URI (typically
+ // using the extentsion)
+ bool SniffURI(nsIRequest* aRequest);
+
+ // LastDitchSniff guesses at text/plain vs. application/octet-stream
+ // by just looking at whether the data contains null bytes, and
+ // maybe at the fraction of chars with high bit set. Use this only
+ // as a last-ditch attempt to decide a content type!
+ bool LastDitchSniff(nsIRequest* aRequest);
+
+ /**
+ * An entry struct for our array of sniffers. Each entry has either
+ * a type associated with it (set these with the SNIFFER_ENTRY macro)
+ * or a function to be executed (set these with the
+ * SNIFFER_ENTRY_WITH_FUNC macro). The function should take a single
+ * nsIRequest* and returns bool -- true if it sets mContentType,
+ * false otherwise
+ */
+ struct nsSnifferEntry {
+ using TypeSniffFunc = bool (nsUnknownDecoder::*)(nsIRequest*);
+
+ const char* mBytes;
+ uint32_t mByteLen;
+
+ // Exactly one of mMimeType and mContentTypeSniffer should be set non-null
+ const char* mMimeType;
+ TypeSniffFunc mContentTypeSniffer;
+ };
+
+#define SNIFFER_ENTRY(_bytes, _type) \
+ { _bytes, sizeof(_bytes) - 1, _type, nullptr }
+
+#define SNIFFER_ENTRY_WITH_FUNC(_bytes, _func) \
+ { _bytes, sizeof(_bytes) - 1, nullptr, _func }
+
+ static nsSnifferEntry sSnifferEntries[];
+ static uint32_t sSnifferEntryNum;
+
+ // We guarantee in order delivery of OnStart, OnStop and OnData, therefore
+ // we do not need proper locking for mBuffer.
+ mozilla::Atomic<char*> mBuffer;
+ mozilla::Atomic<uint32_t> mBufferLen;
+
+ nsCString mContentType;
+
+ // This mutex syncs: mContentType, mDecodedData and mNextListener.
+ mutable mozilla::Mutex mMutex MOZ_UNANNOTATED;
+
+ protected:
+ nsresult ConvertEncodedData(nsIRequest* request, const char* data,
+ uint32_t length);
+ nsCString mDecodedData; // If data are encoded this will be uncompress data.
+};
+
+#define NS_BINARYDETECTOR_CID \
+ { /* a2027ec6-ba0d-4c72-805d-148233f5f33c */ \
+ 0xa2027ec6, 0xba0d, 0x4c72, { \
+ 0x80, 0x5d, 0x14, 0x82, 0x33, 0xf5, 0xf3, 0x3c \
+ } \
+ }
+
+/**
+ * Class that detects whether a data stream is text or binary. This reuses
+ * most of nsUnknownDecoder except the actual content-type determination logic
+ * -- our overridden DetermineContentType simply calls LastDitchSniff and sets
+ * the type to APPLICATION_GUESS_FROM_EXT if the data is detected as binary.
+ */
+class nsBinaryDetector : public nsUnknownDecoder {
+ protected:
+ virtual void DetermineContentType(nsIRequest* aRequest) override;
+};
+
+#endif /* nsUnknownDecoder_h__ */