image/decoders/nsIconDecoder.cpp@ac0c01689b40 (annotated)
image/decoders/nsIconDecoder.cpp
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "nsIconDecoder.h" |
| michael@0 | 8 | #include "nsIInputStream.h" |
| michael@0 | 9 | #include "RasterImage.h" |
| michael@0 | 10 | #include "nspr.h" |
| michael@0 | 11 | #include "nsRect.h" |
| michael@0 | 12 | |
| michael@0 | 13 | #include "nsError.h" |
| michael@0 | 14 | #include <algorithm> |
| michael@0 | 15 | |
| michael@0 | 16 | namespace mozilla { |
| michael@0 | 17 | namespace image { |
| michael@0 | 18 | |
| michael@0 | 19 | nsIconDecoder::nsIconDecoder(RasterImage &aImage) |
| michael@0 | 20 | : Decoder(aImage), |
| michael@0 | 21 | mWidth(-1), |
| michael@0 | 22 | mHeight(-1), |
| michael@0 | 23 | mPixBytesRead(0), |
| michael@0 | 24 | mState(iconStateStart) |
| michael@0 | 25 | { |
| michael@0 | 26 | // Nothing to do |
| michael@0 | 27 | } |
| michael@0 | 28 | |
| michael@0 | 29 | nsIconDecoder::~nsIconDecoder() |
| michael@0 | 30 | { } |
| michael@0 | 31 | |
| michael@0 | 32 | void |
| michael@0 | 33 | nsIconDecoder::WriteInternal(const char *aBuffer, uint32_t aCount, DecodeStrategy) |
| michael@0 | 34 | { |
| michael@0 | 35 | NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!"); |
| michael@0 | 36 | |
| michael@0 | 37 | // We put this here to avoid errors about crossing initialization with case |
| michael@0 | 38 | // jumps on linux. |
| michael@0 | 39 | uint32_t bytesToRead = 0; |
| michael@0 | 40 | |
| michael@0 | 41 | // Loop until the input data is gone |
| michael@0 | 42 | while (aCount > 0) { |
| michael@0 | 43 | switch (mState) { |
| michael@0 | 44 | case iconStateStart: |
| michael@0 | 45 | |
| michael@0 | 46 | // Grab the width |
| michael@0 | 47 | mWidth = (uint8_t)*aBuffer; |
| michael@0 | 48 | |
| michael@0 | 49 | // Book Keeping |
| michael@0 | 50 | aBuffer++; |
| michael@0 | 51 | aCount--; |
| michael@0 | 52 | mState = iconStateHaveHeight; |
| michael@0 | 53 | break; |
| michael@0 | 54 | |
| michael@0 | 55 | case iconStateHaveHeight: |
| michael@0 | 56 | |
| michael@0 | 57 | // Grab the Height |
| michael@0 | 58 | mHeight = (uint8_t)*aBuffer; |
| michael@0 | 59 | |
| michael@0 | 60 | // Post our size to the superclass |
| michael@0 | 61 | PostSize(mWidth, mHeight); |
| michael@0 | 62 | if (HasError()) { |
| michael@0 | 63 | // Setting the size led to an error. |
| michael@0 | 64 | mState = iconStateFinished; |
| michael@0 | 65 | return; |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | // If We're doing a size decode, we're done |
| michael@0 | 69 | if (IsSizeDecode()) { |
| michael@0 | 70 | mState = iconStateFinished; |
| michael@0 | 71 | break; |
| michael@0 | 72 | } |
| michael@0 | 73 | |
| michael@0 | 74 | if (!mImageData) { |
| michael@0 | 75 | PostDecoderError(NS_ERROR_OUT_OF_MEMORY); |
| michael@0 | 76 | return; |
| michael@0 | 77 | } |
| michael@0 | 78 | |
| michael@0 | 79 | // Book Keeping |
| michael@0 | 80 | aBuffer++; |
| michael@0 | 81 | aCount--; |
| michael@0 | 82 | mState = iconStateReadPixels; |
| michael@0 | 83 | break; |
| michael@0 | 84 | |
| michael@0 | 85 | case iconStateReadPixels: |
| michael@0 | 86 | { |
| michael@0 | 87 | |
| michael@0 | 88 | // How many bytes are we reading? |
| michael@0 | 89 | bytesToRead = std::min(aCount, mImageDataLength - mPixBytesRead); |
| michael@0 | 90 | |
| michael@0 | 91 | // Copy the bytes |
| michael@0 | 92 | memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead); |
| michael@0 | 93 | |
| michael@0 | 94 | // Performance isn't critical here, so our update rectangle is |
| michael@0 | 95 | // always the full icon |
| michael@0 | 96 | nsIntRect r(0, 0, mWidth, mHeight); |
| michael@0 | 97 | |
| michael@0 | 98 | // Invalidate |
| michael@0 | 99 | PostInvalidation(r); |
| michael@0 | 100 | |
| michael@0 | 101 | // Book Keeping |
| michael@0 | 102 | aBuffer += bytesToRead; |
| michael@0 | 103 | aCount -= bytesToRead; |
| michael@0 | 104 | mPixBytesRead += bytesToRead; |
| michael@0 | 105 | |
| michael@0 | 106 | // If we've got all the pixel bytes, we're finished |
| michael@0 | 107 | if (mPixBytesRead == mImageDataLength) { |
| michael@0 | 108 | PostFrameStop(); |
| michael@0 | 109 | PostDecodeDone(); |
| michael@0 | 110 | mState = iconStateFinished; |
| michael@0 | 111 | } |
| michael@0 | 112 | break; |
| michael@0 | 113 | } |
| michael@0 | 114 | |
| michael@0 | 115 | case iconStateFinished: |
| michael@0 | 116 | |
| michael@0 | 117 | // Consume all excess data silently |
| michael@0 | 118 | aCount = 0; |
| michael@0 | 119 | |
| michael@0 | 120 | break; |
| michael@0 | 121 | } |
| michael@0 | 122 | } |
| michael@0 | 123 | } |
| michael@0 | 124 | |
| michael@0 | 125 | } // namespace image |
| michael@0 | 126 | } // namespace mozilla |
