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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/url_request/mime_sniffer_proxy.h"
#include "net/base/io_buffer.h"
#include "net/base/mime_sniffer.h"
static const int kBufferSize = 1024;
MimeSnifferProxy::MimeSnifferProxy(URLRequest* request,
URLRequest::Delegate* delegate)
: request_(request), delegate_(delegate),
sniff_content_(false), error_(false),
buf_(new net::IOBuffer(kBufferSize)) {
request->set_delegate(this);
}
void MimeSnifferProxy::OnResponseStarted(URLRequest* request) {
if (request->status().is_success()) {
request->GetMimeType(&mime_type_);
if (net::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_, kBufferSize, &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(net::IOBuffer* 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->data(), buf_->data(), 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;
net::SniffMimeType(buf_->data(), bytes_read_, request_->url(),
type_hint, &mime_type_);
} else {
error_ = true;
}
delegate_->OnResponseStarted(request_);
return;
}
delegate_->OnReadCompleted(request, bytes_read);
}
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