The Tor Browser: intl/lwbrk/src/nsPangoBreaker.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsComplexBreaker.h"

     8 #include <pango/pango-break.h>

     9 #include "nsUTF8Utils.h"

    10 #include "nsString.h"

    11 #include "nsTArray.h"

    13 void

    14 NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,

    15                         uint8_t* aBreakBefore)

    16 {

    17   NS_ASSERTION(aText, "aText shouldn't be null");

    19   memset(aBreakBefore, false, aLength * sizeof(uint8_t));

    21   nsAutoTArray<PangoLogAttr, 2000> attrBuffer;

    22   if (!attrBuffer.AppendElements(aLength + 1))

    23     return;

    25   NS_ConvertUTF16toUTF8 aUTF8(aText, aLength);

    27   const gchar* p = aUTF8.Data();

    28   const gchar* end = p + aUTF8.Length();

    29   uint32_t     u16Offset = 0;

    31   static PangoLanguage* language = pango_language_from_string("en");

    33   while (p < end)

    34   {

    35     PangoLogAttr* attr = attrBuffer.Elements();

    36     pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length());

    38     while (p < end)

    39     {

    40       aBreakBefore[u16Offset] = attr->is_line_break;

    41       if (NS_IS_LOW_SURROGATE(aText[u16Offset]))

    42         aBreakBefore[++u16Offset] = false; // Skip high surrogate

    43       ++u16Offset;

    45       bool err;

    46       uint32_t ch = UTF8CharEnumerator::NextChar(&p, end, &err);

    47       ++attr;

    49       if (ch == 0 || err) {

    50         // pango_break (pango 1.16.2) only analyses text before the

    51         // first NUL (but sets one extra attr). Workaround loop to call

    52         // pango_break again to analyse after the NUL is done somewhere else

    53         // (gfx/thebes/gfxPangoFonts.cpp: SetupClusterBoundaries()).

    54         // So, we do the same here for pango_get_log_attrs.

    55         break;

    56       }

    57     }

    58   }

    59 }

The Tor Browser / file revision

intl/lwbrk/src/nsPangoBreaker.cpp@97036ab72558

intl/lwbrk/src/nsPangoBreaker.cpp