gecko/xpcom/tests/TestPipe.cpp

247 lines
5.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "TestHarness.h"
#include "nsIPipe.h"
#include "nsIMemory.h"
#include "mozilla/Attributes.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
/** NS_NewPipe2 reimplemented, because it's not exported by XPCOM */
nsresult TP_NewPipe2(nsIAsyncInputStream** input,
nsIAsyncOutputStream** output,
bool nonBlockingInput,
bool nonBlockingOutput,
uint32_t segmentSize,
uint32_t segmentCount,
nsIMemory* segmentAlloc)
{
nsCOMPtr<nsIPipe> pipe = do_CreateInstance("@mozilla.org/pipe;1");
if (!pipe)
return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = pipe->Init(nonBlockingInput,
nonBlockingOutput,
segmentSize,
segmentCount,
segmentAlloc);
if (NS_FAILED(rv))
return rv;
pipe->GetInputStream(input);
pipe->GetOutputStream(output);
return NS_OK;
}
/**
* Allocator can allocate exactly count * size bytes, stored at mMemory;
* immediately after the end of this is a byte-map of 0/1 values indicating
* which <size>-byte locations in mMemory are empty and which are filled.
* Pretty stupid, but enough to test bug 394692.
*/
class BackwardsAllocator MOZ_FINAL : public nsIMemory
{
public:
BackwardsAllocator()
: mMemory(0),
mIndex(0xFFFFFFFF),
mCount(0xFFFFFFFF),
mSize(0)
{ }
~BackwardsAllocator()
{
delete [] mMemory;
}
nsresult Init(uint32_t count, size_t size);
NS_DECL_ISUPPORTS
NS_DECL_NSIMEMORY
private:
uint32_t previous(uint32_t i)
{
if (i == 0)
return mCount - 1;
return i - 1;
}
private:
uint8_t* mMemory;
uint32_t mIndex;
uint32_t mCount;
size_t mSize;
};
NS_IMPL_ISUPPORTS1(BackwardsAllocator, nsIMemory)
nsresult BackwardsAllocator::Init(uint32_t count, size_t size)
{
if (mMemory)
{
fail("allocator already initialized!");
return NS_ERROR_ALREADY_INITIALIZED;
}
mMemory = new uint8_t[count * size + count];
if (!mMemory)
{
fail("failed to allocate mMemory!");
return NS_ERROR_OUT_OF_MEMORY;
}
memset(mMemory, 0, count * size + count);
mIndex = 0;
mCount = count;
mSize = size;
return NS_OK;
}
NS_IMETHODIMP_(void*) BackwardsAllocator::Alloc(size_t size)
{
if (size != mSize)
{
NS_ERROR("umm, why would this be reached for this test?");
return nullptr;
}
uint32_t index = mIndex;
while ((index = previous(index)) != mIndex)
{
if (mMemory[mSize * mCount + index] == 1)
continue;
mMemory[mSize * mCount + index] = 1;
mIndex = index;
return &mMemory[mSize * index];
}
NS_ERROR("shouldn't reach here in this test");
return nullptr;
}
NS_IMETHODIMP_(void*) BackwardsAllocator::Realloc(void* ptr, size_t newSize)
{
NS_ERROR("shouldn't reach here in this test");
return nullptr;
}
NS_IMETHODIMP_(void) BackwardsAllocator::Free(void* ptr)
{
uint8_t* p = static_cast<uint8_t*>(ptr);
if (p)
mMemory[mCount * mSize + (p - mMemory) / mSize] = 0;
}
NS_IMETHODIMP BackwardsAllocator::HeapMinimize(bool immediate)
{
return NS_OK;
}
NS_IMETHODIMP BackwardsAllocator::IsLowMemory(bool* retval)
{
*retval = false;
return NS_OK;
}
NS_IMETHODIMP BackwardsAllocator::IsLowMemoryPlatform(bool* retval)
{
*retval = false;
return NS_OK;
}
nsresult TestBackwardsAllocator()
{
const uint32_t SEGMENT_COUNT = 10;
const uint32_t SEGMENT_SIZE = 10;
nsRefPtr<BackwardsAllocator> allocator = new BackwardsAllocator();
if (!allocator)
{
fail("Allocation of BackwardsAllocator failed!");
return NS_ERROR_OUT_OF_MEMORY;
}
nsresult rv = allocator->Init(SEGMENT_COUNT, SEGMENT_SIZE);
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsIAsyncInputStream> input;
nsCOMPtr<nsIAsyncOutputStream> output;
rv = TP_NewPipe2(getter_AddRefs(input),
getter_AddRefs(output),
false,
false,
SEGMENT_SIZE, SEGMENT_COUNT, allocator);
if (NS_FAILED(rv))
{
fail("TP_NewPipe2 failed: %x", rv);
return rv;
}
const uint32_t BUFFER_LENGTH = 100;
const char written[] =
"0123456789"
"1123456789"
"2123456789"
"3123456789"
"4123456789"
"5123456789"
"6123456789"
"7123456789"
"8123456789"
"9123456789"; // not just a memset, to ensure the allocator works correctly
if (sizeof(written) < BUFFER_LENGTH)
{
fail("test error with string size");
return NS_ERROR_FAILURE;
}
uint32_t writeCount;
rv = output->Write(written, BUFFER_LENGTH, &writeCount);
if (NS_FAILED(rv) || writeCount != BUFFER_LENGTH)
{
fail("writing %d bytes (wrote %d bytes) to output failed: %x",
BUFFER_LENGTH, writeCount, rv);
return rv;
}
char read[BUFFER_LENGTH];
uint32_t readCount;
rv = input->Read(read, BUFFER_LENGTH, &readCount);
if (NS_FAILED(rv) || readCount != BUFFER_LENGTH)
{
fail("reading %d bytes (got %d bytes) from input failed: %x",
BUFFER_LENGTH, readCount, rv);
return rv;
}
if (0 != memcmp(written, read, BUFFER_LENGTH))
{
fail("didn't read the written data correctly!");
return NS_ERROR_FAILURE;
}
passed("TestBackwardsAllocator");
return NS_OK;
}
int main(int argc, char** argv)
{
ScopedXPCOM xpcom("nsPipe");
if (xpcom.failed())
return 1;
int rv = 0;
if (NS_FAILED(TestBackwardsAllocator()))
rv = 1;
return rv;
}