TestStringStream.cpp

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/* -*- 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 "gtest/gtest.h"

#include "Helpers.h"

#include "mozilla/gtest/MozAssertions.h"

#include "nsICloneableInputStream.h"

#include "nsStringStream.h"

#include "nsTArray.h"

#include "nsIInputStream.h"

#include "nsCOMPtr.h"

#include "nsStreamUtils.h"

#include "mozilla/Span.h"

#include "nsISeekableStream.h"

namespace {

static void TestStringStream(uint32_t aNumBytes) {

  nsTArray<char> inputData;

  testing::CreateData(aNumBytes, inputData);

  nsDependentCSubstring inputString(inputData.Elements(), inputData.Length());

  nsCOMPtr<nsIInputStream> stream;

  nsresult rv = NS_NewCStringInputStream(getter_AddRefs(stream), inputString);

  ASSERT_NS_SUCCEEDED(rv);

  testing::ConsumeAndValidateStream(stream, inputString);

static void TestStringStreamClone(uint32_t aNumBytes) {

  nsTArray<char> inputData;

  testing::CreateData(aNumBytes, inputData);

  nsDependentCSubstring inputString(inputData.Elements(), inputData.Length());

  nsCOMPtr<nsIInputStream> stream;

  nsresult rv = NS_NewCStringInputStream(getter_AddRefs(stream), inputString);

  ASSERT_NS_SUCCEEDED(rv);

  nsCOMPtr<nsICloneableInputStream> cloneable = do_QueryInterface(stream);

  ASSERT_TRUE(cloneable != nullptr);

  ASSERT_TRUE(cloneable->GetCloneable());

  nsCOMPtr<nsIInputStream> clone;

  rv = cloneable->Clone(getter_AddRefs(clone));

  testing::ConsumeAndValidateStream(stream, inputString);

  // Release the stream to verify that the clone's string survives correctly.

  stream = nullptr;

  testing::ConsumeAndValidateStream(clone, inputString);

}  // namespace

TEST(StringStream, Simple_4k)

{ TestStringStream(1024 * 4); }

TEST(StringStream, Clone_4k)

{ TestStringStreamClone(1024 * 4); }

static nsresult CloseStreamThenRead(nsIInputStream* aInStr, void* aClosure,

                                    const char* aBuffer, uint32_t aOffset,

                                    uint32_t aCount, uint32_t* aCountWritten) {

  // Closing the stream will free the data

  nsresult rv = aInStr->Close();

  if (NS_FAILED(rv)) {

    return rv;

  // This will likely be allocated in the same slot as what we have in aBuffer

  char* newAlloc = moz_xstrdup("abcd");

  char* toBuf = static_cast<char*>(aClosure);

  memcpy(&toBuf[aOffset], aBuffer, aCount);

  *aCountWritten = aCount;

  free(newAlloc);

  return NS_OK;

TEST(StringStream, CancelInReadSegments)

  char* buffer = moz_xstrdup("test");

  nsCOMPtr<nsIInputStream> stream;

  nsresult rv = NS_NewByteInputStream(

      getter_AddRefs(stream), mozilla::Span(buffer, 5), NS_ASSIGNMENT_ADOPT);

  ASSERT_NS_SUCCEEDED(rv);

  char buf[100];

  uint32_t count = 0;

  uint64_t available = 0;

  rv = stream->Available(&available);

  ASSERT_NS_SUCCEEDED(rv);

  rv = stream->ReadSegments(CloseStreamThenRead, buf, available, &count);

  ASSERT_NS_SUCCEEDED(rv);

  ASSERT_TRUE(count == 5);

  ASSERT_TRUE(!strcmp(buf, "test"));