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-rw-r--r--js/src/jsapi-tests/testWasmLEB128.cpp173
1 files changed, 173 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testWasmLEB128.cpp b/js/src/jsapi-tests/testWasmLEB128.cpp
new file mode 100644
index 0000000000..58ded9ab26
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+++ b/js/src/jsapi-tests/testWasmLEB128.cpp
@@ -0,0 +1,173 @@
+/* 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 <stdlib.h>
+
+#include "jsapi-tests/tests.h"
+
+#include "wasm/WasmValidate.h"
+
+static bool WriteValidBytes(js::wasm::Encoder& encoder, bool* passed) {
+ *passed = false;
+ if (!encoder.empty()) {
+ return true;
+ }
+
+ // These remain the same under LEB128 unsigned encoding
+ if (!encoder.writeVarU32(0x0) || !encoder.writeVarU32(0x1) ||
+ !encoder.writeVarU32(0x42)) {
+ return false;
+ }
+
+ // 0x01 0x80
+ if (!encoder.writeVarU32(0x80)) {
+ return false;
+ }
+
+ // 0x03 0x80
+ if (!encoder.writeVarU32(0x180)) {
+ return false;
+ }
+
+ if (encoder.empty()) {
+ return true;
+ }
+ if (encoder.currentOffset() != 7) {
+ return true;
+ }
+ *passed = true;
+ return true;
+}
+
+BEGIN_TEST(testWasmLEB128_encoding) {
+ using namespace js;
+ using namespace wasm;
+
+ Bytes bytes;
+ Encoder encoder(bytes);
+
+ bool passed;
+ if (!WriteValidBytes(encoder, &passed)) {
+ return false;
+ }
+ CHECK(passed);
+
+ size_t i = 0;
+ CHECK(bytes[i++] == 0x0);
+ CHECK(bytes[i++] == 0x1);
+ CHECK(bytes[i++] == 0x42);
+
+ CHECK(bytes[i++] == 0x80);
+ CHECK(bytes[i++] == 0x01);
+
+ CHECK(bytes[i++] == 0x80);
+ CHECK(bytes[i++] == 0x03);
+
+ if (i + 1 < bytes.length()) {
+ CHECK(bytes[i++] == 0x00);
+ }
+ return true;
+}
+END_TEST(testWasmLEB128_encoding)
+
+BEGIN_TEST(testWasmLEB128_valid_decoding) {
+ using namespace js;
+ using namespace wasm;
+
+ Bytes bytes;
+ if (!bytes.append(0x0) || !bytes.append(0x1) || !bytes.append(0x42)) {
+ return false;
+ }
+
+ if (!bytes.append(0x80) || !bytes.append(0x01)) {
+ return false;
+ }
+
+ if (!bytes.append(0x80) || !bytes.append(0x03)) {
+ return false;
+ }
+
+ {
+ // Fallible decoding
+ Decoder decoder(bytes);
+ uint32_t value;
+
+ CHECK(decoder.readVarU32(&value) && value == 0x0);
+ CHECK(decoder.readVarU32(&value) && value == 0x1);
+ CHECK(decoder.readVarU32(&value) && value == 0x42);
+ CHECK(decoder.readVarU32(&value) && value == 0x80);
+ CHECK(decoder.readVarU32(&value) && value == 0x180);
+
+ CHECK(decoder.done());
+ }
+
+ {
+ // Infallible decoding
+ Decoder decoder(bytes);
+ uint32_t value;
+
+ value = decoder.uncheckedReadVarU32();
+ CHECK(value == 0x0);
+ value = decoder.uncheckedReadVarU32();
+ CHECK(value == 0x1);
+ value = decoder.uncheckedReadVarU32();
+ CHECK(value == 0x42);
+ value = decoder.uncheckedReadVarU32();
+ CHECK(value == 0x80);
+ value = decoder.uncheckedReadVarU32();
+ CHECK(value == 0x180);
+
+ CHECK(decoder.done());
+ }
+ return true;
+}
+END_TEST(testWasmLEB128_valid_decoding)
+
+BEGIN_TEST(testWasmLEB128_invalid_decoding) {
+ using namespace js;
+ using namespace wasm;
+
+ Bytes bytes;
+ // Fill bits as per 28 encoded bits
+ if (!bytes.append(0x80) || !bytes.append(0x80) || !bytes.append(0x80) ||
+ !bytes.append(0x80)) {
+ return false;
+ }
+
+ // Test last valid values
+ if (!bytes.append(0x00)) {
+ return false;
+ }
+
+ for (uint8_t i = 0; i < 0x0F; i++) {
+ bytes[4] = i;
+
+ {
+ Decoder decoder(bytes);
+ uint32_t value;
+ CHECK(decoder.readVarU32(&value));
+ CHECK(value == uint32_t(i << 28));
+ CHECK(decoder.done());
+ }
+
+ {
+ Decoder decoder(bytes);
+ uint32_t value = decoder.uncheckedReadVarU32();
+ CHECK(value == uint32_t(i << 28));
+ CHECK(decoder.done());
+ }
+ }
+
+ // Test all invalid values of the same size
+ for (uint8_t i = 0x10; i < 0xF0; i++) {
+ bytes[4] = i;
+
+ Decoder decoder(bytes);
+ uint32_t value;
+ CHECK(!decoder.readVarU32(&value));
+ }
+
+ return true;
+}
+END_TEST(testWasmLEB128_invalid_decoding)