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// Copyright 2017 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/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/zucchini/zucchini_integration.h"
#include <stdint.h>
#include <utility>
#include "base/containers/span.h"
#include "base/logging.h"
#include "build/build_config.h"
#include "components/zucchini/buffer_view.h"
#include "components/zucchini/mapped_file.h"
#include "components/zucchini/patch_reader.h"
#if BUILDFLAG(IS_WIN)
#include <ntstatus.h>
#include "components/zucchini/exception_filter_helper_win.h"
#endif
namespace zucchini {
namespace {
struct FileNames {
FileNames() : is_dummy(true) {
// Use fake names.
old_name = old_name.AppendASCII("old_name");
new_name = new_name.AppendASCII("new_name");
patch_name = patch_name.AppendASCII("patch_name");
}
FileNames(const base::FilePath& old_name,
const base::FilePath& new_name,
const base::FilePath& patch_name)
: old_name(old_name),
new_name(new_name),
patch_name(patch_name),
is_dummy(false) {}
base::FilePath old_name;
base::FilePath new_name;
base::FilePath patch_name;
// A flag to decide whether the filenames are only for error output.
const bool is_dummy;
};
status::Code GenerateCommon(base::File old_file,
base::File new_file,
base::File patch_file,
const FileNames& names,
bool force_keep,
const GenerateOptions& options) {
MappedFileReader mapped_old(std::move(old_file));
if (mapped_old.HasError()) {
LOG(ERROR) << "Error with file " << names.old_name.value() << ": "
<< mapped_old.error();
return status::kStatusFileReadError;
}
MappedFileReader mapped_new(std::move(new_file));
if (mapped_new.HasError()) {
LOG(ERROR) << "Error with file " << names.new_name.value() << ": "
<< mapped_new.error();
return status::kStatusFileReadError;
}
EnsemblePatchWriter patch_writer(mapped_old.region(), mapped_new.region());
status::Code result = GenerateBuffer(mapped_old.region(), mapped_new.region(),
options, &patch_writer);
if (result != status::kStatusSuccess) {
LOG(ERROR) << "Fatal error encountered when generating patch.";
return result;
}
// By default, delete patch on destruction, to avoid having lingering files in
// case of a failure. On Windows deletion can be done by the OS.
MappedFileWriter mapped_patch(names.patch_name, std::move(patch_file),
patch_writer.SerializedSize());
if (mapped_patch.HasError()) {
LOG(ERROR) << "Error with file " << names.patch_name.value() << ": "
<< mapped_patch.error();
return status::kStatusFileWriteError;
}
if (force_keep)
mapped_patch.Keep();
if (!patch_writer.SerializeInto(mapped_patch.region()))
return status::kStatusPatchWriteError;
// Successfully created patch. Explicitly request file to be kept.
if (!mapped_patch.Keep())
return status::kStatusFileWriteError;
return status::kStatusSuccess;
}
status::Code ApplyCommon(base::File old_file,
base::File patch_file,
base::File new_file,
const FileNames& names,
bool force_keep) {
#if BUILDFLAG(IS_WIN)
ExceptionFilterHelper exception_filter_helper;
__try {
#endif
MappedFileReader mapped_patch(std::move(patch_file));
if (mapped_patch.HasError()) {
LOG(ERROR) << "Error with file " << names.patch_name.value() << ": "
<< mapped_patch.error();
return status::kStatusFileReadError;
}
#if BUILDFLAG(IS_WIN)
exception_filter_helper.AddRange(
{mapped_patch.data(), mapped_patch.length()});
#endif
auto patch_reader = EnsemblePatchReader::Create(mapped_patch.region());
if (!patch_reader.has_value()) {
LOG(ERROR) << "Error reading patch header.";
return status::kStatusPatchReadError;
}
MappedFileReader mapped_old(std::move(old_file));
if (mapped_old.HasError()) {
LOG(ERROR) << "Error with file " << names.old_name.value() << ": "
<< mapped_old.error();
return status::kStatusFileReadError;
}
#if BUILDFLAG(IS_WIN)
exception_filter_helper.AddRange({mapped_old.data(), mapped_old.length()});
#endif
PatchHeader header = patch_reader->header();
// By default, delete output on destruction, to avoid having lingering files
// in case of a failure. On Windows deletion can be done by the OS.
MappedFileWriter mapped_new(names.new_name, std::move(new_file),
header.new_size);
if (mapped_new.HasError()) {
LOG(ERROR) << "Error with file " << names.new_name.value() << ": "
<< mapped_new.error();
return status::kStatusFileWriteError;
}
if (force_keep) {
mapped_new.Keep();
}
#if BUILDFLAG(IS_WIN)
exception_filter_helper.AddRange({mapped_new.data(), mapped_new.length()});
#endif
status::Code result =
ApplyBuffer(mapped_old.region(), *patch_reader, mapped_new.region());
if (result != status::kStatusSuccess) {
LOG(ERROR) << "Fatal error encountered while applying patch.";
return result;
}
// Successfully patch |mapped_new|. Explicitly request file to be kept.
return mapped_new.Keep() ? status::kStatusSuccess
: status::kStatusFileWriteError;
#if BUILDFLAG(IS_WIN)
} __except (exception_filter_helper.FilterPageError(
GetExceptionInformation()->ExceptionRecord)) {
LOG(ERROR) << "EXCEPTION_IN_PAGE_ERROR while "
<< (exception_filter_helper.is_write() ? "writing to"
: "reading from")
<< " mapped files; NTSTATUS = "
<< exception_filter_helper.nt_status();
return exception_filter_helper.nt_status() == STATUS_DISK_FULL
? status::kStatusDiskFull
: status::kStatusIoError;
}
#endif // BUILDFLAG(IS_WIN)
}
status::Code VerifyPatchCommon(base::File patch_file,
base::FilePath patch_name) {
MappedFileReader mapped_patch(std::move(patch_file));
if (mapped_patch.HasError()) {
LOG(ERROR) << "Error with file " << patch_name.value() << ": "
<< mapped_patch.error();
return status::kStatusFileReadError;
}
auto patch_reader = EnsemblePatchReader::Create(mapped_patch.region());
if (!patch_reader.has_value()) {
LOG(ERROR) << "Error reading patch header.";
return status::kStatusPatchReadError;
}
return status::kStatusSuccess;
}
} // namespace
status::Code Generate(base::File old_file,
base::File new_file,
base::File patch_file,
const GenerateOptions& options,
bool force_keep) {
const FileNames file_names;
return GenerateCommon(std::move(old_file), std::move(new_file),
std::move(patch_file), file_names, force_keep, options);
}
status::Code Generate(const base::FilePath& old_path,
const base::FilePath& new_path,
const base::FilePath& patch_path,
const GenerateOptions& options,
bool force_keep) {
using base::File;
File old_file(old_path, File::FLAG_OPEN | File::FLAG_READ |
base::File::FLAG_WIN_SHARE_DELETE);
File new_file(new_path, File::FLAG_OPEN | File::FLAG_READ |
base::File::FLAG_WIN_SHARE_DELETE);
File patch_file(patch_path, File::FLAG_CREATE_ALWAYS | File::FLAG_READ |
File::FLAG_WRITE |
File::FLAG_WIN_SHARE_DELETE |
File::FLAG_CAN_DELETE_ON_CLOSE);
const FileNames file_names(old_path, new_path, patch_path);
return GenerateCommon(std::move(old_file), std::move(new_file),
std::move(patch_file), file_names, force_keep, options);
}
status::Code Apply(base::File old_file,
base::File patch_file,
base::File new_file,
bool force_keep) {
const FileNames file_names;
return ApplyCommon(std::move(old_file), std::move(patch_file),
std::move(new_file), file_names, force_keep);
}
status::Code Apply(const base::FilePath& old_path,
const base::FilePath& patch_path,
const base::FilePath& new_path,
bool force_keep) {
using base::File;
File old_file(old_path, File::FLAG_OPEN | File::FLAG_READ |
base::File::FLAG_WIN_SHARE_DELETE);
File patch_file(patch_path, File::FLAG_OPEN | File::FLAG_READ |
base::File::FLAG_WIN_SHARE_DELETE);
File new_file(new_path, File::FLAG_CREATE_ALWAYS | File::FLAG_READ |
File::FLAG_WRITE | File::FLAG_WIN_SHARE_DELETE |
File::FLAG_CAN_DELETE_ON_CLOSE);
const FileNames file_names(old_path, new_path, patch_path);
return ApplyCommon(std::move(old_file), std::move(patch_file),
std::move(new_file), file_names, force_keep);
}
status::Code VerifyPatch(base::File patch_file) {
return VerifyPatchCommon(std::move(patch_file), base::FilePath());
}
status::Code VerifyPatch(const base::FilePath& patch_path) {
using base::File;
File patch_file(patch_path, File::FLAG_OPEN | File::FLAG_READ |
base::File::FLAG_WIN_SHARE_DELETE);
return VerifyPatchCommon(std::move(patch_file), patch_path);
}
} // namespace zucchini
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