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-rw-r--r--modules/woff2/RLBoxWOFF2Sandbox.cpp64
1 files changed, 64 insertions, 0 deletions
diff --git a/modules/woff2/RLBoxWOFF2Sandbox.cpp b/modules/woff2/RLBoxWOFF2Sandbox.cpp
new file mode 100644
index 0000000000..3ce947af07
--- /dev/null
+++ b/modules/woff2/RLBoxWOFF2Sandbox.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 <woff2/decode.h>
+#include <cassert>
+#include "RLBoxWOFF2Sandbox.h"
+
+bool RLBoxConvertWOFF2ToTTF(const char* aData, unsigned long aLength,
+ unsigned long aDecompressedSize,
+ unsigned long* aResultSize, void** aResultOwningStr,
+ char** aResultData) {
+ std::unique_ptr<std::string> buf =
+ std::make_unique<std::string>(aDecompressedSize, 0);
+ woff2::WOFF2StringOut out(buf.get());
+ if (!woff2::ConvertWOFF2ToTTF(reinterpret_cast<const uint8_t*>(aData),
+ aLength, &out)) {
+ return false;
+ }
+ *aResultSize = out.Size();
+ // Return the string and its underlying C string. We need both to make sure we
+ // can free the string (which we do with RLBoxDeleteWOFF2String).
+ *aResultData = buf->data();
+ *aResultOwningStr = static_cast<void*>(buf.release());
+ return true;
+}
+
+void RLBoxDeleteWOFF2String(void** aStr) {
+ std::string* buf = static_cast<std::string*>(*aStr);
+ delete buf;
+}
+
+BrotliDecompressCallback* sRLBoxBrotliDecompressCallback = nullptr;
+
+void RegisterWOFF2Callback(BrotliDecompressCallback* aCallback) {
+#ifdef MOZ_IN_WASM_SANDBOX
+ // When Woff2 is wasmboxed, we need to register a callback for brotli
+ // decompression. The easiest way to store this is in a static variable. This
+ // is thread-safe because each (potentially-concurrent) woff2 instance gets
+ // its own sandbox with its own copy of the statics.
+ //
+ // When the sandbox is disabled (replaced with the noop sandbox), setting the
+ // callback is actually racey. However, we don't actually need a callback in
+ // that case, and can just invoke brotli directly.
+ sRLBoxBrotliDecompressCallback = aCallback;
+#endif
+}
+
+BrotliDecoderResult RLBoxBrotliDecoderDecompress(size_t aEncodedSize,
+ const uint8_t* aEncodedBuffer,
+ size_t* aDecodedSize,
+ uint8_t* aDecodedBuffer) {
+#ifdef MOZ_IN_WASM_SANDBOX
+ assert(sRLBoxBrotliDecompressCallback);
+ return sRLBoxBrotliDecompressCallback(
+ aEncodedSize, reinterpret_cast<const char*>(aEncodedBuffer), aDecodedSize,
+ reinterpret_cast<char*>(aDecodedBuffer));
+#else
+ return BrotliDecoderDecompress(aEncodedSize, aEncodedBuffer, aDecodedSize,
+ aDecodedBuffer);
+#endif
+}