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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "net/url_request/mime_sniffer_proxy.h"
#include "net/base/mime_sniffer.h"
MimeSnifferProxy::MimeSnifferProxy(URLRequest* request,
URLRequest::Delegate* delegate)
: request_(request), delegate_(delegate),
sniff_content_(false), error_(false) {
request->set_delegate(this);
}
void MimeSnifferProxy::OnResponseStarted(URLRequest* request) {
if (request->status().is_success()) {
request->GetMimeType(&mime_type_);
if (mime_util::ShouldSniffMimeType(request->url(), mime_type_)) {
// We need to read content before we know the mime type,
// so we don't call OnResponseStarted.
sniff_content_ = true;
if (request_->Read(buf_, sizeof(buf_), &bytes_read_) && bytes_read_) {
OnReadCompleted(request, bytes_read_);
} else if (!request_->status().is_io_pending()) {
error_ = true;
delegate_->OnResponseStarted(request);
} // Otherwise, IO pending. Wait for OnReadCompleted.
return;
}
}
delegate_->OnResponseStarted(request);
}
bool MimeSnifferProxy::Read(char* buf, int max_bytes, int *bytes_read) {
if (sniff_content_) {
// This is the first call to Read() after we've sniffed content.
// Return our local buffer or the error we ran into.
sniff_content_ = false; // We're done with sniffing for this request.
if (error_) {
*bytes_read = 0;
return false;
}
memcpy(buf, buf_, bytes_read_);
*bytes_read = bytes_read_;
return true;
}
return request_->Read(buf, max_bytes, bytes_read);
}
void MimeSnifferProxy::OnReadCompleted(URLRequest* request, int bytes_read) {
if (sniff_content_) {
// Our initial content-sniffing Read() has completed.
if (request->status().is_success() && bytes_read) {
std::string type_hint;
request_->GetMimeType(&type_hint);
bytes_read_ = bytes_read;
mime_util::SniffMimeType(buf_, bytes_read_,
request_->url(), type_hint, &mime_type_);
} else {
error_ = true;
}
delegate_->OnResponseStarted(request_);
return;
}
delegate_->OnReadCompleted(request, bytes_read);
}
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