xpcom/tests/TestPipe.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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  15  * The Original Code is mozilla.org code.
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  17  * The Initial Developer of the Original Code is
  18  * Jeff Walden <jwalden+code@mit.edu>.
  19  * Portions created by the Initial Developer are Copyright (C) 2007
  20  * the Initial Developer. All Rights Reserved.
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  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #include "TestHarness.h"
  39
  40 #include "nsIPipe.h"
  41 #include "nsIMemory.h"
  42
  43 /** NS_NewPipe2 reimplemented, because it's not exported by XPCOM */
  44 nsresult TP_NewPipe2(nsIAsyncInputStream** input,
  45                      nsIAsyncOutputStream** output,
  46                      PRBool nonBlockingInput,
  47                      PRBool nonBlockingOutput,
  48                      PRUint32 segmentSize,
  49                      PRUint32 segmentCount,
  50                      nsIMemory* segmentAlloc)
  51 {
  52   nsCOMPtr<nsIPipe> pipe = do_CreateInstance("@mozilla.org/pipe;1");
  53   if (!pipe)
  54     return NS_ERROR_OUT_OF_MEMORY;
  55
  56   nsresult rv = pipe->Init(nonBlockingInput,
  57                            nonBlockingOutput,
  58                            segmentSize,
  59                            segmentCount,
  60                            segmentAlloc);
  61
  62   if (NS_FAILED(rv))
  63     return rv;
  64
  65   pipe->GetInputStream(input);
  66   pipe->GetOutputStream(output);
  67   return NS_OK;
  68 }
  69
  70 /**
  71  * Allocator can allocate exactly count * size bytes, stored at mMemory;
  72  * immediately after the end of this is a byte-map of 0/1 values indicating
  73  * which <size>-byte locations in mMemory are empty and which are filled.
  74  * Pretty stupid, but enough to test bug 394692.
  75  */
  76 class BackwardsAllocator : public nsIMemory
  77 {
  78   public:
  79     BackwardsAllocator()
  80       : mMemory(0),
  81         mIndex(0xFFFFFFFF),
  82         mCount(0xFFFFFFFF),
  83         mSize(0)
  84     { }
  85     ~BackwardsAllocator()
  86     {
  87       delete [] mMemory;
  88     }
  89
  90     nsresult Init(PRUint32 count, size_t size);
  91
  92     NS_DECL_ISUPPORTS
  93     NS_DECL_NSIMEMORY
  94
  95   private:
  96     PRUint32 previous(PRUint32 i)
  97     {
  98       if (i == 0)
  99         return mCount - 1;
 100       return i - 1;
 101     }
 102
 103   private:
 104     PRUint8* mMemory;
 105     PRUint32 mIndex;
 106     PRUint32 mCount;
 107     size_t mSize;
 108 };
 109
 110 NS_IMPL_ISUPPORTS1(BackwardsAllocator, nsIMemory)
 111
 112 nsresult BackwardsAllocator::Init(PRUint32 count, size_t size)
 113 {
 114   if (mMemory)
 115   {
 116     fail("allocator already initialized!");
 117     return NS_ERROR_ALREADY_INITIALIZED;
 118   }
 119
 120   mMemory = new PRUint8[count * size + count];
 121   if (!mMemory)
 122   {
 123     fail("failed to allocate mMemory!");
 124     return NS_ERROR_OUT_OF_MEMORY;
 125   }
 126   memset(mMemory, 0, count * size + count);
 127
 128   mIndex = 0;
 129   mCount = count;
 130   mSize = size;
 131
 132   return NS_OK;
 133 }
 134
 135 NS_IMETHODIMP_(void*) BackwardsAllocator::Alloc(size_t size)
 136 {
 137   if (size != mSize)
 138   {
 139     NS_ERROR("umm, why would this be reached for this test?");
 140     return NULL;
 141   }
 142
 143   PRUint32 index = mIndex;
 144
 145   while ((index = previous(index)) != mIndex)
 146   {
 147     if (mMemory[mSize * mCount + index] == 1)
 148       continue;
 149     mMemory[mSize * mCount + index] = 1;
 150     mIndex = index;
 151     return &mMemory[mSize * index];
 152   }
 153
 154   NS_ERROR("shouldn't reach here in this test");
 155   return NULL;
 156 }
 157
 158 NS_IMETHODIMP_(void*) BackwardsAllocator::Realloc(void* ptr, size_t newSize)
 159 {
 160   NS_ERROR("shouldn't reach here in this test");
 161   return NULL;
 162 }
 163
 164 NS_IMETHODIMP_(void) BackwardsAllocator::Free(void* ptr)
 165 {
 166   PRUint8* p = static_cast<PRUint8*>(ptr);
 167   if (p)
 168     mMemory[mCount * mSize + (p - mMemory) / mSize] = 0;
 169 }
 170
 171 NS_IMETHODIMP BackwardsAllocator::HeapMinimize(PRBool immediate)
 172 {
 173   return NS_OK;
 174 }
 175
 176 NS_IMETHODIMP BackwardsAllocator::IsLowMemory(PRBool* retval)
 177 {
 178   *retval = PR_FALSE;
 179   return NS_OK;
 180 }
 181
 182
 183 nsresult TestBackwardsAllocator()
 184 {
 185   const PRUint32 SEGMENT_COUNT = 10;
 186   const PRUint32 SEGMENT_SIZE = 10;
 187
 188   nsRefPtr<BackwardsAllocator> allocator = new BackwardsAllocator();
 189   if (!allocator)
 190   {
 191     fail("Allocation of BackwardsAllocator failed!");
 192     return NS_ERROR_OUT_OF_MEMORY;
 193   }
 194   nsresult rv = allocator->Init(SEGMENT_COUNT, SEGMENT_SIZE);
 195   if (NS_FAILED(rv))
 196     return rv;
 197
 198   nsCOMPtr<nsIAsyncInputStream> input;
 199   nsCOMPtr<nsIAsyncOutputStream> output;
 200   rv = TP_NewPipe2(getter_AddRefs(input),
 201                    getter_AddRefs(output),
 202                    PR_FALSE,
 203                    PR_FALSE,
 204                    SEGMENT_SIZE, SEGMENT_COUNT, allocator);
 205   if (NS_FAILED(rv))
 206   {
 207     fail("TP_NewPipe2 failed: %x", rv);
 208     return rv;
 209   }
 210
 211   const PRUint32 BUFFER_LENGTH = 100;
 212   const char written[] =
 213     "0123456789"
 214     "1123456789"
 215     "2123456789"
 216     "3123456789"
 217     "4123456789"
 218     "5123456789"
 219     "6123456789"
 220     "7123456789"
 221     "8123456789"
 222     "9123456789"; // not just a memset, to ensure the allocator works correctly
 223   if (sizeof(written) < BUFFER_LENGTH)
 224   {
 225     fail("test error with string size");
 226     return NS_ERROR_FAILURE;
 227   }
 228
 229   PRUint32 writeCount;
 230   rv = output->Write(written, BUFFER_LENGTH, &writeCount);
 231   if (NS_FAILED(rv) || writeCount != BUFFER_LENGTH)
 232   {
 233     fail("writing %d bytes (wrote %d bytes) to output failed: %x",
 234          BUFFER_LENGTH, writeCount, rv);
 235     return rv;
 236   }
 237
 238   char read[BUFFER_LENGTH];
 239   PRUint32 readCount;
 240   rv = input->Read(read, BUFFER_LENGTH, &readCount);
 241   if (NS_FAILED(rv) || readCount != BUFFER_LENGTH)
 242   {
 243     fail("reading %d bytes (got %d bytes) from input failed: %x",
 244          BUFFER_LENGTH, readCount,  rv);
 245     return rv;
 246   }
 247
 248   if (0 != memcmp(written, read, BUFFER_LENGTH))
 249   {
 250     fail("didn't read the written data correctly!");
 251     return NS_ERROR_FAILURE;
 252   }
 253
 254   passed("TestBackwardsAllocator");
 255   return NS_OK;
 256 }
 257
 258 int main(int argc, char** argv)
 259 {
 260   ScopedXPCOM xpcom("nsPipe");
 261   if (xpcom.failed())
 262     return 1;
 263
 264   int rv = 0;
 265
 266   if (NS_FAILED(TestBackwardsAllocator()))
 267     rv = 1;
 268
 269   return rv;
 270 }