summaryrefslogtreecommitdiffstats
path: root/intl/lwbrk/nsUniscribeBreaker.cpp
diff options
context:
space:
mode:
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 /intl/lwbrk/nsUniscribeBreaker.cpp
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'intl/lwbrk/nsUniscribeBreaker.cpp')
-rw-r--r--intl/lwbrk/nsUniscribeBreaker.cpp146
1 files changed, 146 insertions, 0 deletions
diff --git a/intl/lwbrk/nsUniscribeBreaker.cpp b/intl/lwbrk/nsUniscribeBreaker.cpp
new file mode 100644
index 0000000000..fcd1e282e1
--- /dev/null
+++ b/intl/lwbrk/nsUniscribeBreaker.cpp
@@ -0,0 +1,146 @@
+/* -*- 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/. */
+
+#include "nsComplexBreaker.h"
+
+#include <windows.h>
+
+#include <usp10.h>
+
+#include "nsUTF8Utils.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+#if defined(MOZ_SANDBOX)
+# include "mozilla/WindowsProcessMitigations.h"
+# include "mozilla/SandboxSettings.h"
+# include "mozilla/sandboxTarget.h"
+# include "nsXULAppAPI.h"
+
+# if defined(MOZ_DEBUG)
+# include "mozilla/StaticPrefs_intl.h"
+# endif
+#endif
+
+using namespace mozilla;
+
+#if defined(MOZ_SANDBOX)
+static bool UseBrokeredLineBreaking() {
+ // If win32k lockdown is enabled we can't use Uniscribe in this process. Also
+ // if the sandbox is above a certain level we can't load the required DLLs
+ // without other intervention. Given that it looks like we are likely to have
+ // win32k lockdown enabled first, using the brokered call for people testing
+ // this case also makes most sense.
+ static bool sUseBrokeredLineBreaking =
+ IsWin32kLockedDown() ||
+ (XRE_IsContentProcess() && GetEffectiveContentSandboxLevel() >= 20);
+
+ return sUseBrokeredLineBreaking;
+}
+#endif
+
+void NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,
+ uint8_t* aBreakBefore) {
+ NS_ASSERTION(aText, "aText shouldn't be null");
+
+#if defined(MOZ_SANDBOX)
+ if (UseBrokeredLineBreaking()) {
+ // We can't use Uniscribe, so use a brokered call. Use of Uniscribe will be
+ // replaced in bug 1684927.
+ char16ptr_t text = aText;
+ if (!SandboxTarget::Instance()->GetComplexLineBreaks(text, aLength,
+ aBreakBefore)) {
+ NS_WARNING("Brokered line break failed, breaks might be incorrect.");
+ }
+
+ return;
+ }
+#endif
+
+ int outItems = 0;
+ HRESULT result;
+ AutoTArray<SCRIPT_ITEM, 64> items;
+ char16ptr_t text = aText;
+
+ memset(aBreakBefore, false, aLength);
+
+ items.AppendElements(64);
+
+ do {
+ result = ScriptItemize(text, aLength, items.Length(), nullptr, nullptr,
+ items.Elements(), &outItems);
+
+ if (result == E_OUTOFMEMORY) {
+ // XXX(Bug 1631371) Check if this should use a fallible operation as it
+ // pretended earlier.
+ items.AppendElements(items.Length());
+ }
+ } while (result == E_OUTOFMEMORY);
+
+ for (int iItem = 0; iItem < outItems; ++iItem) {
+ uint32_t endOffset =
+ (iItem + 1 == outItems ? aLength : items[iItem + 1].iCharPos);
+ uint32_t startOffset = items[iItem].iCharPos;
+ AutoTArray<SCRIPT_LOGATTR, 64> sla;
+
+ // XXX(Bug 1631371) Check if this should use a fallible operation as it
+ // pretended earlier.
+ sla.AppendElements(endOffset - startOffset);
+
+ if (ScriptBreak(text + startOffset, endOffset - startOffset,
+ &items[iItem].a, sla.Elements()) < 0)
+ return;
+
+ // We don't want to set a potential break position at the start of text;
+ // that's the responsibility of a higher level.
+ for (uint32_t j = startOffset ? 0 : 1; j + startOffset < endOffset; ++j) {
+ aBreakBefore[j + startOffset] = sla[j].fSoftBreak;
+ }
+ }
+
+#if defined(MOZ_DEBUG) && defined(MOZ_SANDBOX)
+ // When tests are enabled and pref is set, we compare the line breaks returned
+ // from the Uniscribe breaker in the content process, with the ones returned
+ // from the brokered call to the parent. If they differ we crash so we can
+ // test using a crashtest.
+ if (!StaticPrefs::intl_compare_against_brokered_complex_line_breaks() ||
+ !XRE_IsContentProcess()) {
+ return;
+ }
+
+ nsTArray<uint8_t> brokeredBreaks(aLength);
+ brokeredBreaks.AppendElements(aLength);
+ if (!SandboxTarget::Instance()->GetComplexLineBreaks(
+ text, aLength, brokeredBreaks.Elements())) {
+ MOZ_CRASH("Brokered GetComplexLineBreaks failed.");
+ }
+
+ bool mismatch = false;
+ for (uint32_t i = 0; i < aLength; ++i) {
+ if (aBreakBefore[i] != brokeredBreaks[i]) {
+ mismatch = true;
+ break;
+ }
+ }
+
+ if (mismatch) {
+ // The logging here doesn't handle surrogates, but we only have tests using
+ // Thai currently, which is BMP-only.
+ printf_stderr("uniscribe: ");
+ for (uint32_t i = 0; i < aLength; ++i) {
+ if (aBreakBefore[i]) printf_stderr("#");
+ printf_stderr("%s", NS_ConvertUTF16toUTF8(aText + i, 1).get());
+ }
+ printf_stderr("\n");
+ printf_stderr("brokered : ");
+ for (uint32_t i = 0; i < aLength; ++i) {
+ if (brokeredBreaks[i]) printf_stderr("#");
+ printf_stderr("%s", NS_ConvertUTF16toUTF8(aText + i, 1).get());
+ }
+ printf_stderr("\n");
+ MOZ_CRASH("Brokered breaks did not match.");
+ }
+#endif
+}