private void BufferData(byte[] data, int offset, int size, bool needToCopyData)
{
int n;
// try last buffer
if (_lastBuffer != null)
{
n = _lastBuffer.Append(data, offset, size);
size -= n;
offset += n;
}
else if (!needToCopyData && offset == 0 && !_responseBufferingOn)
{
// when not buffering, there is no need for big buffer accumulating multiple writes
// the byte[] data can be sent as is
_buffers.Add(new HttpResponseBufferElement(data, size));
return;
}
// do other buffers if needed
while (size > 0)
{
_lastBuffer = new HttpResponseBufferElement();
_buffers.Add(_lastBuffer);
n = _lastBuffer.Append(data, offset, size);
offset += n;
size -= n;
}
}
//
// Buffer management
//
internal void ClearBuffers()
{
ClearCharBuffer();
_buffers = new ArrayList();
_lastBuffer = null;
}
private void BufferResource(IntPtr data, int offset, int size)
{
if (size > BufferingParams.MAX_RESOURCE_BYTES_TO_COPY || !_responseBufferingOn)
{
// for long response strings create its own buffer element to avoid copy cost
// also, when not buffering, no need for an extra copy (nothing will get accumulated anyway)
_lastBuffer = null;
_buffers.Add(new HttpResourceResponseElement(data, offset, size));
return;
}
int n;
// try last buffer
if (_lastBuffer != null)
{
n = _lastBuffer.Append(data, offset, size);
size -= n;
offset += n;
}
// do other buffers if needed
while (size > 0)
{
_lastBuffer = new HttpResponseBufferElement();
_buffers.Add(_lastBuffer);
n = _lastBuffer.Append(data, offset, size);
offset += n;
size -= n;
}
}
internal void Filter(bool finalFiltering)
{
// no filter?
if (_installedFilter == null)
{
return;
}
// flush char buffer and remember old buffers
if (_charBufferLength != _charBufferFree)
{
FlushCharBuffer(true);
}
_lastBuffer = null;
// no content to filter
if (_buffers.Count == 0)
{
return;
}
// remember old buffers
ArrayList oldBuffers = _buffers;
_buffers = new ArrayList();
// push old buffer list through the filter
Debug.Assert(_filterSink != null);
_filterSink.Filtering = true;
try {
int n = oldBuffers.Count;
for (int i = 0; i < n; i++)
{
IHttpResponseElement buf = (IHttpResponseElement)oldBuffers[i];
int len = buf.GetSize();
if (len > 0)
{
_installedFilter.Write(buf.GetBytes(), 0, len);
}
}
_installedFilter.Flush();
if (finalFiltering)
{
_installedFilter.Close();
}
}
finally {
_filterSink.Filtering = false;
}
}
private static CachedRawResponse Convert(OutputCacheEntry oce)
{
ArrayList headers = null;
if ((oce.HeaderElements != null) && (oce.HeaderElements.Count > 0))
{
headers = new ArrayList(oce.HeaderElements.Count);
for (int i = 0; i < oce.HeaderElements.Count; i++)
{
HttpResponseHeader header = new HttpResponseHeader(oce.HeaderElements[i].Name, oce.HeaderElements[i].Value);
headers.Add(header);
}
}
ArrayList buffers = null;
if ((oce.ResponseElements != null) && (oce.ResponseElements.Count > 0))
{
buffers = new ArrayList(oce.ResponseElements.Count);
for (int j = 0; j < oce.ResponseElements.Count; j++)
{
ResponseElement element = oce.ResponseElements[j];
IHttpResponseElement element2 = null;
if (element is FileResponseElement)
{
HttpContext current = HttpContext.Current;
HttpWorkerRequest request = (current != null) ? current.WorkerRequest : null;
bool supportsLongTransmitFile = (request != null) && request.SupportsLongTransmitFile;
bool isImpersonating = ((current != null) && current.IsClientImpersonationConfigured) || HttpRuntime.IsOnUNCShareInternal;
FileResponseElement element3 = (FileResponseElement) element;
element2 = new HttpFileResponseElement(element3.Path, element3.Offset, element3.Length, isImpersonating, supportsLongTransmitFile);
}
else if (element is MemoryResponseElement)
{
MemoryResponseElement element4 = (MemoryResponseElement) element;
int size = System.Convert.ToInt32(element4.Length);
element2 = new HttpResponseBufferElement(element4.Buffer, size);
}
else
{
if (!(element is SubstitutionResponseElement))
{
throw new NotSupportedException();
}
SubstitutionResponseElement element5 = (SubstitutionResponseElement) element;
element2 = new HttpSubstBlockResponseElement(element5.Callback);
}
buffers.Add(element2);
}
}
else
{
buffers = new ArrayList();
}
return new CachedRawResponse(new HttpRawResponse(oce.StatusCode, oce.StatusDescription, headers, buffers, false), oce.Settings, oce.KernelCacheUrl, oce.CachedVaryId);
}
internal void WriteFile(IntPtr fileHandle, long offset, long size)
{
if (_charBufferLength != _charBufferFree)
{
FlushCharBuffer(true);
}
_lastBuffer = null;
_buffers.Add(new HttpFileResponseElement(fileHandle, offset, size));
if (!_responseBufferingOn)
{
_response.Flush();
}
}
internal HttpWriter(HttpResponse response)
{
_response = response;
_stream = new HttpResponseStream(this);
_buffers = new ArrayList();
_lastBuffer = null;
_charBuffer = (char[])s_Allocator.GetBuffer();
_charBufferLength = _charBuffer.Length;
_charBufferFree = _charBufferLength;
UpdateResponseBuffering();
UpdateResponseEncoding();
}
private void FlushCharBuffer(bool flushEncoder)
{
int numChars = _charBufferLength - _charBufferFree;
Debug.Assert(numChars > 0);
// remember that response required encoding (to indicate the charset= is needed)
_responseEncodingUsed = true;
// estimate conversion size
int estByteSize = _responseEncoding.GetMaxByteCount(numChars);
int realByteSize;
if (estByteSize <= BufferingParams.MAX_BYTES_TO_COPY || !_responseBufferingOn)
{
// small size -- allocate intermediate buffer and copy into the output buffer
byte[] byteBuffer = new byte[estByteSize];
realByteSize = _responseEncoder.GetBytes(_charBuffer, 0, numChars,
byteBuffer, 0, flushEncoder);
BufferData(byteBuffer, 0, realByteSize, false);
}
else
{
// convert right into the output buffer
int free = (_lastBuffer != null) ? _lastBuffer.FreeBytes : 0;
if (free < estByteSize)
{
// need new buffer -- last one doesn't have enough space
_lastBuffer = new HttpResponseBufferElement();
_buffers.Add(_lastBuffer);
free = _lastBuffer.FreeBytes;
}
// byte buffers must be long enough to keep everything in char buffer
Debug.Assert(free >= estByteSize);
realByteSize = _responseEncoder.GetBytes(_charBuffer, 0, numChars,
_lastBuffer.ByteBuffer, _lastBuffer.ByteOffset, flushEncoder);
_lastBuffer.FreeBytes = free - realByteSize;
}
_charBufferFree = _charBufferLength;
}
//
// Snapshot for caching
//
internal ArrayList GetSnapshot(out bool hasSubstBlocks)
{
if (_charBufferLength != _charBufferFree)
{
FlushCharBuffer(true);
}
_lastBuffer = null; // to make sure nothing gets appended after
hasSubstBlocks = false;
ArrayList buffers = new ArrayList();
// copy buffer references to the returned list, make non-recyclable
int n = _buffers.Count;
for (int i = 0; i < n; i++)
{
Object responseElement = _buffers[i];
HttpResponseBufferElement buffer = responseElement as HttpResponseBufferElement;
if (buffer != null)
{
if (buffer.FreeBytes > BufferingParams.MAX_FREE_BYTES_TO_CACHE)
{
// copy data if too much is free
responseElement = buffer.Clone();
}
else
{
// cache the buffer as is with free bytes
buffer.DisableRecycling();
}
}
else if (responseElement is HttpSubstBlockResponseElement)
{
hasSubstBlocks = true;
}
buffers.Add(responseElement);
}
return(buffers);
}
//
// Support for substitution blocks
//
internal void WriteSubstBlock(String name, String defaultValue)
{
if (_charBufferLength != _charBufferFree)
{
FlushCharBuffer(true);
}
_lastBuffer = null;
// convert filler to byte array bytes
int numChars = defaultValue.Length;
int maxNumBytes = _responseEncoding.GetMaxByteCount(numChars);
byte[] fillerBytes = new byte[maxNumBytes];
int numBytes = _responseEncoder.GetBytes(defaultValue.ToCharArray(), 0, numChars, fillerBytes, 0, true);
// add new substitution block to the buffer list
_buffers.Add(new HttpSubstBlockResponseElement(name, fillerBytes, numBytes));
}
internal void MakeSubstitution(String name, String value, bool canChangeSize)
{
// find the block by name
int i = FindSubstitutionBlock(name);
if (i < 0)
{
return;
}
HttpSubstBlockResponseElement block = (HttpSubstBlockResponseElement)_buffers[i];
// allocate byte array
int size = block.GetSize();
int maxBytes = _responseEncoding.GetMaxByteCount(value.Length);
if (maxBytes < size)
{
maxBytes = size;
}
byte[] bytes = new byte[maxBytes];
// prefill with filler
System.Array.Copy(block.Data, bytes, size);
// convert string
int newSize = _responseEncoder.GetBytes(value.ToCharArray(), 0, value.Length, bytes, 0, true);
// adjust size if allowed
if (canChangeSize)
{
size = newSize;
}
// replace substitution block with memory block
_buffers[i] = new HttpResponseBufferElement(bytes, size);
}
private static CachedRawResponse Convert(OutputCacheEntry oce) {
ArrayList headers = null;
if (oce.HeaderElements != null && oce.HeaderElements.Count > 0) {
headers = new ArrayList(oce.HeaderElements.Count);
for (int i = 0; i < oce.HeaderElements.Count; i++) {
HttpResponseHeader h = new HttpResponseHeader(oce.HeaderElements[i].Name, oce.HeaderElements[i].Value);
headers.Add(h);
}
}
ArrayList buffers = null;
if (oce.ResponseElements != null && oce.ResponseElements.Count > 0) {
buffers = new ArrayList(oce.ResponseElements.Count);
for (int i = 0; i < oce.ResponseElements.Count; i++) {
ResponseElement re = oce.ResponseElements[i];
IHttpResponseElement elem = null;
if (re is FileResponseElement) {
HttpContext context = HttpContext.Current;
HttpWorkerRequest wr = (context != null) ? context.WorkerRequest : null;
bool supportsLongTransmitFile = (wr != null && wr.SupportsLongTransmitFile);
bool isImpersonating = ((context != null && context.IsClientImpersonationConfigured) || HttpRuntime.IsOnUNCShareInternal);
FileResponseElement fre = (FileResponseElement)re;
// DevDiv #21203: Need to verify permission to access the requested file since handled by native code.
HttpRuntime.CheckFilePermission(fre.Path);
elem = new HttpFileResponseElement(fre.Path, fre.Offset, fre.Length, isImpersonating, supportsLongTransmitFile);
}
else if (re is MemoryResponseElement) {
MemoryResponseElement mre = (MemoryResponseElement)re;
int size = System.Convert.ToInt32(mre.Length);
elem = new HttpResponseBufferElement(mre.Buffer, size);
}
else if (re is SubstitutionResponseElement) {
SubstitutionResponseElement sre = (SubstitutionResponseElement)re;
elem = new HttpSubstBlockResponseElement(sre.Callback);
}
else {
throw new NotSupportedException();
}
buffers.Add(elem);
}
}
else {
buffers = new ArrayList();
}
HttpRawResponse rawResponse = new HttpRawResponse(oce.StatusCode, oce.StatusDescription, headers, buffers, false /*hasSubstBlocks*/);
CachedRawResponse cachedRawResponse = new CachedRawResponse(rawResponse, oce.Settings, oce.KernelCacheUrl, oce.CachedVaryId);
return cachedRawResponse;
}
