Quelle testWasmLEB128.cpp Sprache: C

/* 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)

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