chromium/net/filter/gzip_source_stream.cc

// 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.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif

#include "net/filter/gzip_source_stream.h"

#include <algorithm>
#include <memory>
#include <utility>

#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted.h"
#include "base/notreached.h"
#include "base/numerics/checked_math.h"
#include "net/base/io_buffer.h"
#include "third_party/zlib/zlib.h"

namespace net {

namespace {

const char kDeflate[] = …;
const char kGzip[] = …;

// For deflate streams, if more than this many bytes have been received without
// an error and without adding a Zlib header, assume the original stream had a
// Zlib header. In practice, don't need nearly this much data, but since the
// detection logic is a heuristic, best to be safe. Data is freed once it's been
// determined whether the stream has a zlib header or not, so larger values
// shouldn't affect memory usage, in practice.
const int kMaxZlibHeaderSniffBytes = …;

}  // namespace

GzipSourceStream::~GzipSourceStream() { … }

std::unique_ptr<GzipSourceStream> GzipSourceStream::Create(
    std::unique_ptr<SourceStream> upstream,
    SourceStream::SourceType type) { … }

GzipSourceStream::GzipSourceStream(std::unique_ptr<SourceStream> upstream,
                                   SourceStream::SourceType type)
    : … { … }

bool GzipSourceStream::Init() { … }

std::string GzipSourceStream::GetTypeAsString() const { … }

base::expected<size_t, Error> GzipSourceStream::FilterData(
    IOBuffer* output_buffer,
    size_t output_buffer_size,
    IOBuffer* input_buffer,
    size_t input_buffer_size,
    size_t* consumed_bytes,
    bool upstream_end_reached) { … }

bool GzipSourceStream::InsertZlibHeader() { … }

}  // namespace net