C++ PR_MIN函数代码示例

PRBool
gfxImageSurface::CopyFrom(gfxImageSurface *other)
{
    if (other->mSize != mSize)
    {
        return PR_FALSE;
    }

    if (other->mFormat != mFormat &&
        !(other->mFormat == ImageFormatARGB32 && mFormat == ImageFormatRGB24) &&
        !(other->mFormat == ImageFormatRGB24 && mFormat == ImageFormatARGB32))
    {
        return PR_FALSE;
    }

    if (other->mStride == mStride) {
        memcpy (mData, other->mData, mStride * mSize.height);
    } else {
        int lineSize = PR_MIN(other->mStride, mStride);
        for (int i = 0; i < mSize.height; i++) {
            unsigned char *src = other->mData + other->mStride * i;
            unsigned char *dst = mData + mStride * i;

            memcpy (dst, src, lineSize);
        }
    }

    return PR_TRUE;
}

nsSMILTimeValue
nsSMILTimedElement::GetRepeatDuration()
{
  nsSMILTimeValue result;

  if (mRepeatCount.IsDefinite() && mRepeatDur.IsResolved()) {
    if (mSimpleDur.IsResolved()) {
      nsSMILTime activeDur = mRepeatCount * double(mSimpleDur.GetMillis());
      result.SetMillis(PR_MIN(activeDur, mRepeatDur.GetMillis()));
    } else {
      result = mRepeatDur;
    }
  } else if (mRepeatCount.IsDefinite() && mSimpleDur.IsResolved()) {
    nsSMILTime activeDur = mRepeatCount * double(mSimpleDur.GetMillis());
    result.SetMillis(activeDur);
  } else if (mRepeatDur.IsResolved()) {
    result = mRepeatDur;
  } else if (mRepeatCount.IsIndefinite()) {
    result.SetIndefinite();
  } else {
    result = mSimpleDur;
  }

  return result;
}

SECStatus
SSL_GetPreliminaryChannelInfo(PRFileDesc *fd,
                              SSLPreliminaryChannelInfo *info,
                              PRUintn len)
{
    sslSocket *ss;
    SSLPreliminaryChannelInfo inf;

    /* Check if we can properly return the length of data written and that
     * we're not asked to return more information than we know how to provide.
     */
    if (!info || len < sizeof inf.length || len > sizeof inf) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_GetPreliminaryChannelInfo",
                 SSL_GETPID(), fd));
        return SECFailure;
    }

    memset(&inf, 0, sizeof(inf));
    inf.length = PR_MIN(sizeof(inf), len);

    inf.valuesSet = ss->ssl3.hs.preliminaryInfo;
    inf.protocolVersion = ss->version;
    inf.cipherSuite = ss->ssl3.hs.cipher_suite;

    memcpy(info, &inf, inf.length);
    return SECSuccess;
}

nsresult
nsMsgSearchValidityTable::GetAvailableOperators(nsMsgSearchAttribValue aAttribute,
                                                PRUint32 *aLength,
                                                nsMsgSearchOpValue **aResult)
{
    nsMsgSearchAttribValue attr;
    if (aAttribute == nsMsgSearchAttrib::Default)
      attr = m_defaultAttrib;
    else
       attr = PR_MIN(aAttribute, nsMsgSearchAttrib::OtherHeader);

    PRUint32 totalOperators=0;
    PRInt32 i;
    for (i=0; i<nsMsgSearchOp::kNumMsgSearchOperators; i++) {
        if (m_table[attr][i].bitAvailable)
            totalOperators++;
    }

    nsMsgSearchOpValue *array = (nsMsgSearchOpValue*)
        nsMemory::Alloc(sizeof(nsMsgSearchOpValue) * totalOperators);
    NS_ENSURE_TRUE(array, NS_ERROR_OUT_OF_MEMORY);

    PRUint32 numStored = 0;
    for (i=0; i<nsMsgSearchOp::kNumMsgSearchOperators;i++) {
        if (m_table[attr][i].bitAvailable)
            array[numStored++] = i;
    }

    NS_ASSERTION(totalOperators == numStored, "Search Operators not lining up");
    *aLength = totalOperators;
    *aResult = array;
    return NS_OK;
}

void nsBufferDecoderSupport::FillBuffer(const char ** aSrc, PRInt32 aSrcLength)
{
  PRInt32 bcr = PR_MIN(mBufferCapacity - mBufferLength, aSrcLength);
  memcpy(mBuffer + mBufferLength, *aSrc, bcr);
  mBufferLength += bcr;
  (*aSrc) += bcr;
}

static PRInt32 FindSafeLength(nsThebesRenderingContext* aContext,
                              const char *aString, PRUint32 aLength,
                              PRUint32 aMaxChunkLength)
{
    // Since it's ASCII, we don't need to worry about clusters or RTL
    return PR_MIN(aLength, aMaxChunkLength);
}

/* Use this function to update the ClientRandom of a client's handshake state
 * after replacing its ClientHello message. We for example need to do this
 * when replacing an SSLv3 ClientHello with its SSLv2 equivalent. */
SECStatus SSLInt_UpdateSSLv2ClientRandom(PRFileDesc *fd, uint8_t *rnd,
                                         size_t rnd_len, uint8_t *msg,
                                         size_t msg_len) {
  sslSocket *ss = ssl_FindSocket(fd);
  if (!ss) {
    return SECFailure;
  }

  SECStatus rv = ssl3_InitState(ss);
  if (rv != SECSuccess) {
    return rv;
  }

  rv = ssl3_RestartHandshakeHashes(ss);
  if (rv != SECSuccess) {
    return rv;
  }

  // Ensure we don't overrun hs.client_random.
  rnd_len = PR_MIN(SSL3_RANDOM_LENGTH, rnd_len);

  // Zero the client_random struct.
  PORT_Memset(&ss->ssl3.hs.client_random, 0, SSL3_RANDOM_LENGTH);

  // Copy over the challenge bytes.
  size_t offset = SSL3_RANDOM_LENGTH - rnd_len;
  PORT_Memcpy(&ss->ssl3.hs.client_random.rand[offset], rnd, rnd_len);

  // Rehash the SSLv2 client hello message.
  return ssl3_UpdateHandshakeHashes(ss, msg, msg_len);
}

NS_IMETHODIMP
nsJSONListener::OnDataAvailable(nsIRequest *aRequest, nsISupports *aContext,
                                nsIInputStream *aStream,
                                PRUint32 aOffset, PRUint32 aLength)
{
  PRUint32 contentLength;
  aStream->Available(&contentLength);
  nsresult rv = NS_OK;

  if (mNeedsConverter && mSniffBuffer.Length() < 4) {
    PRUint32 readCount = (aLength < 4) ? aLength : 4;
    rv = NS_ConsumeStream(aStream, readCount, mSniffBuffer);
    NS_ENSURE_SUCCESS(rv, rv);

    if (mSniffBuffer.Length() < 4)
      return NS_OK;
  }
  
  char buffer[JSON_STREAM_BUFSIZE];
  unsigned long bytesRemaining = aLength - mSniffBuffer.Length();
  while (bytesRemaining) {
    unsigned int bytesRead;
    rv = aStream->Read(buffer,
                       PR_MIN(sizeof(buffer), bytesRemaining),
                       &bytesRead);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = ProcessBytes(buffer, bytesRead);
    NS_ENSURE_SUCCESS(rv, rv);
    bytesRemaining -= bytesRead;
  }

  return rv;
}

SECStatus
SSL_GetCipherSuiteInfo(PRUint16 cipherSuite,
                       SSLCipherSuiteInfo *info, PRUintn len)
{
    unsigned int i;

    /* Check if we can properly return the length of data written and that
     * we're not asked to return more information than we know how to provide.
     */
    if (!info || len < sizeof suiteInfo[0].length ||
        len > sizeof suiteInfo[0]) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    len = PR_MIN(len, sizeof suiteInfo[0]);
    for (i = 0; i < NUM_SUITEINFOS; i++) {
        if (suiteInfo[i].cipherSuite == cipherSuite) {
            memcpy(info, &suiteInfo[i], len);
            info->length = len;
            return SECSuccess;
        }
    }
    PORT_SetError(SEC_ERROR_INVALID_ARGS);
    return SECFailure;
}

nsresult PREF_GetCharPref(const char *pref_name, char * return_buffer, int * length, PRBool get_default)
{
    if (!gHashTable.ops)
        return NS_ERROR_NOT_INITIALIZED;

    nsresult rv = NS_ERROR_UNEXPECTED;
    char* stringVal;

    PrefHashEntry* pref = pref_HashTableLookup(pref_name);

    if (pref)
    {
        if (get_default || PREF_IS_LOCKED(pref) || !PREF_HAS_USER_VALUE(pref))
            stringVal = pref->defaultPref.stringVal;
        else
            stringVal = pref->userPref.stringVal;

        if (stringVal)
        {
            if (*length <= 0)
                *length = PL_strlen(stringVal) + 1;
            else
            {
                PL_strncpy(return_buffer, stringVal, PR_MIN((size_t)*length - 1, PL_strlen(stringVal) + 1));
                return_buffer[*length - 1] = '\0';
            }
            rv = NS_OK;
        }
    }

    return rv;
}

void 
MD2_Update(MD2Context *cx, const unsigned char *input, unsigned int inputLen)
{
	PRUint32 bytesToConsume;
	
	/* Fill the remaining input buffer. */
	if (cx->unusedBuffer != MD2_BUFSIZE) {
		bytesToConsume = PR_MIN(inputLen, cx->unusedBuffer);
		memcpy(&cx->X[MD2_INPUT + (MD2_BUFSIZE - cx->unusedBuffer)],
		            input, bytesToConsume);
		if (cx->unusedBuffer + bytesToConsume >= MD2_BUFSIZE)
			md2_compress(cx);
		inputLen -= bytesToConsume;
		input += bytesToConsume;
	}

	/* Iterate over 16-byte chunks of the input. */
	while (inputLen >= MD2_BUFSIZE) {
		memcpy(&cx->X[MD2_INPUT], input, MD2_BUFSIZE);
		md2_compress(cx);
		inputLen -= MD2_BUFSIZE;
		input += MD2_BUFSIZE;
	}

	/* Copy any input that remains into the buffer. */
	if (inputLen)
		memcpy(&cx->X[MD2_INPUT], input, inputLen);
	cx->unusedBuffer = MD2_BUFSIZE - inputLen;
}

SECStatus
SSL_GetPreliminaryChannelInfo(PRFileDesc *fd,
                              SSLPreliminaryChannelInfo *info,
                              PRUintn len)
{
    sslSocket *ss;
    SSLPreliminaryChannelInfo inf;

    if (!info || len < sizeof inf.length) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_GetPreliminaryChannelInfo",
                 SSL_GETPID(), fd));
        return SECFailure;
    }

    if (ss->version < SSL_LIBRARY_VERSION_3_0) {
        PORT_SetError(SSL_ERROR_FEATURE_NOT_SUPPORTED_FOR_VERSION);
        return SECFailure;
    }

    memset(&inf, 0, sizeof(inf));
    inf.length = PR_MIN(sizeof(inf), len);

    inf.valuesSet = ss->ssl3.hs.preliminaryInfo;
    inf.protocolVersion = ss->version;
    inf.cipherSuite = ss->ssl3.hs.cipher_suite;

    memcpy(info, &inf, inf.length);
    return SECSuccess;
}

NS_IMETHODIMP
nsIncrementalDownload::OnDataAvailable(nsIRequest *request,
                                       nsISupports *context,
                                       nsIInputStream *input,
                                       PRUint32 offset,
                                       PRUint32 count)
{
  while (count) {
    PRUint32 space = mChunkSize - mChunkLen;
    PRUint32 n, len = PR_MIN(space, count);

    nsresult rv = input->Read(mChunk + mChunkLen, len, &n);
    if (NS_FAILED(rv))
      return rv;
    if (n != len)
      return NS_ERROR_UNEXPECTED;

    count -= n;
    mChunkLen += n;

    if (mChunkLen == mChunkSize)
      FlushChunk();
  }

  if (PR_Now() > mLastProgressUpdate + UPDATE_PROGRESS_INTERVAL)
    UpdateProgress();

  return NS_OK;
}

PRBool
nsAttrValue::ParseSpecialIntValue(const nsAString& aString,
                                  PRBool aCanBePercent)
{
  ResetIfSet();

  PRInt32 ec;
  nsAutoString tmp(aString);
  PRInt32 val = tmp.ToInteger(&ec);

  if (NS_FAILED(ec)) {
    return PR_FALSE;
  }

  val = PR_MAX(val, 0);
  val = PR_MIN(val, NS_ATTRVALUE_INTEGERTYPE_MAXVALUE);

  // % (percent)
  // XXX RFindChar means that 5%x will be parsed!
  if (aCanBePercent && tmp.RFindChar('%') >= 0) {
    if (val > 100) {
      val = 100;
    }
    SetIntValueAndType(val, ePercent);
    return PR_TRUE;
  }

  // Straight number is interpreted as integer
  SetIntValueAndType(val, eInteger);
  return PR_TRUE;
}

static void
PaintCheckMark(nsIRenderingContext& aRenderingContext,
               const nsRect& aRect)
{
  // Points come from the coordinates on a 7X7 unit box centered at 0,0
  const PRInt32 checkPolygonX[] = { -3, -1,  3,  3, -1, -3 };
  const PRInt32 checkPolygonY[] = { -1,  1, -3, -1,  3,  1 };
  const PRInt32 checkNumPoints = sizeof(checkPolygonX) / sizeof(PRInt32);
  const PRInt32 checkSize      = 9; // This is value is determined by adding 2
                                    // units to pad the 7x7 unit checkmark

  // Scale the checkmark based on the smallest dimension
  nscoord paintScale = PR_MIN(aRect.width, aRect.height) / checkSize;
  nsPoint paintCenter(aRect.x + aRect.width  / 2,
                      aRect.y + aRect.height / 2);

  nsPoint paintPolygon[checkNumPoints];
  // Convert checkmark for screen rendering
  for (PRInt32 polyIndex = 0; polyIndex < checkNumPoints; polyIndex++) {
    paintPolygon[polyIndex] = paintCenter +
                              nsPoint(checkPolygonX[polyIndex] * paintScale,
                                      checkPolygonY[polyIndex] * paintScale);
  }

  aRenderingContext.FillPolygon(paintPolygon, checkNumPoints);
}