cef/libcef_dll/wrapper/cef_stream_resource_handler.cc

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// Copyright (c) 2012 The Chromium Embedded Framework 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 "include/wrapper/cef_stream_resource_handler.h"
#include <algorithm>
#include "include/base/cef_bind.h"
#include "include/base/cef_logging.h"
#include "include/base/cef_macros.h"
#include "include/cef_callback.h"
#include "include/cef_request.h"
#include "include/cef_stream.h"
#include "include/wrapper/cef_closure_task.h"
#include "include/wrapper/cef_helpers.h"
// Class that represents a readable/writable character buffer.
class CefStreamResourceHandler::Buffer {
public:
Buffer()
: size_(0),
bytes_requested_(0),
bytes_written_(0),
bytes_read_(0) {
}
void Reset(int new_size) {
if (size_ < new_size) {
size_ = new_size;
buffer_.reset(new char[size_]);
DCHECK(buffer_);
}
bytes_requested_ = new_size;
bytes_written_ = 0;
bytes_read_ = 0;
}
bool IsEmpty() const {
return (bytes_written_ == 0);
}
bool CanRead() const {
return (bytes_read_ < bytes_written_);
}
int WriteTo(void* data_out, int bytes_to_read) {
const int write_size =
std::min(bytes_to_read, bytes_written_ - bytes_read_);
if (write_size > 0) {
memcpy(data_out, buffer_ .get() + bytes_read_, write_size);
bytes_read_ += write_size;
}
return write_size;
}
int ReadFrom(CefRefPtr<CefStreamReader> reader) {
// Read until the buffer is full or until Read() returns 0 to indicate no
// more data.
int bytes_read;
do {
bytes_read = static_cast<int>(
reader->Read(buffer_.get() + bytes_written_, 1,
bytes_requested_ - bytes_written_));
bytes_written_ += bytes_read;
} while (bytes_read != 0 && bytes_written_ < bytes_requested_);
return bytes_written_;
}
private:
scoped_ptr<char[]> buffer_;
int size_;
int bytes_requested_;
int bytes_written_;
int bytes_read_;
DISALLOW_COPY_AND_ASSIGN(Buffer);
};
CefStreamResourceHandler::CefStreamResourceHandler(
const CefString& mime_type,
CefRefPtr<CefStreamReader> stream)
: status_code_(200),
status_text_("OK"),
mime_type_(mime_type),
stream_(stream)
#ifndef NDEBUG
, buffer_owned_by_file_thread_(false)
#endif
{
DCHECK(!mime_type_.empty());
DCHECK(stream_.get());
read_on_file_thread_ = stream_->MayBlock();
}
CefStreamResourceHandler::CefStreamResourceHandler(
int status_code,
const CefString& status_text,
const CefString& mime_type,
CefResponse::HeaderMap header_map,
CefRefPtr<CefStreamReader> stream)
: status_code_(status_code),
status_text_(status_text),
mime_type_(mime_type),
header_map_(header_map),
stream_(stream)
#ifndef NDEBUG
, buffer_owned_by_file_thread_(false)
#endif
{
DCHECK(!mime_type_.empty());
DCHECK(stream_.get());
read_on_file_thread_ = stream_->MayBlock();
}
CefStreamResourceHandler::~CefStreamResourceHandler() {
}
bool CefStreamResourceHandler::ProcessRequest(CefRefPtr<CefRequest> request,
CefRefPtr<CefCallback> callback) {
callback->Continue();
return true;
}
void CefStreamResourceHandler::GetResponseHeaders(
CefRefPtr<CefResponse> response,
int64& response_length,
CefString& redirectUrl) {
response->SetStatus(status_code_);
response->SetStatusText(status_text_);
response->SetMimeType(mime_type_);
if (!header_map_.empty())
response->SetHeaderMap(header_map_);
response_length = -1;
}
bool CefStreamResourceHandler::ReadResponse(void* data_out,
int bytes_to_read,
int& bytes_read,
CefRefPtr<CefCallback> callback) {
DCHECK_GT(bytes_to_read, 0);
if (read_on_file_thread_) {
#ifndef NDEBUG
DCHECK(!buffer_owned_by_file_thread_);
#endif
if (buffer_ && (buffer_->CanRead() || buffer_->IsEmpty())) {
if (buffer_->CanRead()) {
// Provide data from the buffer.
bytes_read = buffer_->WriteTo(data_out, bytes_to_read);
return (bytes_read > 0);
} else {
// End of the steam.
bytes_read = 0;
return false;
}
} else {
// Perform another read on the file thread.
bytes_read = 0;
#ifndef NDEBUG
buffer_owned_by_file_thread_ = true;
#endif
CefPostTask(TID_FILE,
base::Bind(&CefStreamResourceHandler::ReadOnFileThread, this,
bytes_to_read, callback));
return true;
}
} else {
// Read until the buffer is full or until Read() returns 0 to indicate no
// more data.
bytes_read = 0;
int read = 0;
do {
read = static_cast<int>(
stream_->Read(static_cast<char*>(data_out) + bytes_read, 1,
bytes_to_read - bytes_read));
bytes_read += read;
} while (read != 0 && bytes_read < bytes_to_read);
return (bytes_read > 0);
}
}
void CefStreamResourceHandler::Cancel() {
}
void CefStreamResourceHandler::ReadOnFileThread(
int bytes_to_read,
CefRefPtr<CefCallback> callback) {
CEF_REQUIRE_FILE_THREAD();
#ifndef NDEBUG
DCHECK(buffer_owned_by_file_thread_);
#endif
if (!buffer_)
buffer_.reset(new Buffer());
buffer_->Reset(bytes_to_read);
buffer_->ReadFrom(stream_);
#ifndef NDEBUG
buffer_owned_by_file_thread_ = false;
#endif
callback->Continue();
}