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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/filter/fuzzed_source_stream.h"
#include <fuzzer/FuzzedDataProvider.h>
#include <algorithm>
#include <string>
#include <utility>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/task/single_thread_task_runner.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/filter/source_stream_type.h"
namespace net {
namespace {
// Common net error codes that can be returned by a SourceStream.
const Error kReadErrors[] = {OK, ERR_FAILED, ERR_CONTENT_DECODING_FAILED};
} // namespace
FuzzedSourceStream::FuzzedSourceStream(FuzzedDataProvider* data_provider)
: SourceStream(SourceStreamType::kNone), data_provider_(data_provider) {}
FuzzedSourceStream::~FuzzedSourceStream() {
DCHECK(!read_pending_);
}
int FuzzedSourceStream::Read(IOBuffer* buf,
int buf_len,
CompletionOnceCallback callback) {
DCHECK(!read_pending_);
DCHECK(!end_returned_);
DCHECK_LE(0, buf_len);
bool sync = data_provider_->ConsumeBool();
int result = data_provider_->ConsumeIntegralInRange(0, buf_len);
std::string data = data_provider_->ConsumeBytesAsString(result);
result = data.size();
if (result <= 0)
result = data_provider_->PickValueInArray(kReadErrors);
if (sync) {
if (result > 0) {
std::ranges::copy(data, buf->data());
} else {
end_returned_ = true;
}
return result;
}
scoped_refptr<IOBuffer> pending_read_buf = buf;
read_pending_ = true;
// |this| is owned by the caller so use base::Unretained is safe.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&FuzzedSourceStream::OnReadComplete,
base::Unretained(this), std::move(callback),
std::move(data), pending_read_buf, result));
return ERR_IO_PENDING;
}
std::string FuzzedSourceStream::Description() const {
return "";
}
bool FuzzedSourceStream::MayHaveMoreBytes() const {
return !end_returned_;
}
void FuzzedSourceStream::OnReadComplete(CompletionOnceCallback callback,
const std::string& fuzzed_data,
scoped_refptr<IOBuffer> read_buf,
int result) {
DCHECK(read_pending_);
if (result > 0) {
// FuzzedSourceStream::Read() should ensure `fuzzed_data` fits in
// `read_buf`.
read_buf->span().copy_prefix_from(base::as_byte_span(fuzzed_data));
} else {
end_returned_ = true;
}
read_pending_ = false;
std::move(callback).Run(result);
}
} // namespace net
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