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//
// Copyright (C) 2017 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "update_engine/payload_consumer/file_descriptor_utils.h"
#include <algorithm>
#include <base/logging.h>
#include "update_engine/common/hash_calculator.h"
#include "update_engine/common/utils.h"
#include "update_engine/payload_consumer/extent_reader.h"
#include "update_engine/payload_consumer/extent_writer.h"
using google::protobuf::RepeatedPtrField;
using std::min;
namespace chromeos_update_engine {
namespace {
// Size of the buffer used to copy blocks.
const int kMaxCopyBufferSize = 1024 * 1024;
} // namespace
namespace fd_utils {
bool CopyAndHashExtents(FileDescriptorPtr source,
const RepeatedPtrField<Extent>& src_extents,
FileDescriptorPtr target,
const RepeatedPtrField<Extent>& tgt_extents,
uint32_t block_size,
brillo::Blob* hash_out) {
uint64_t total_blocks = utils::BlocksInExtents(src_extents);
TEST_AND_RETURN_FALSE(total_blocks == utils::BlocksInExtents(tgt_extents));
DirectExtentReader reader;
TEST_AND_RETURN_FALSE(reader.Init(source, src_extents, block_size));
DirectExtentWriter writer;
TEST_AND_RETURN_FALSE(writer.Init(target, tgt_extents, block_size));
uint64_t buffer_blocks = kMaxCopyBufferSize / block_size;
// Ensure we copy at least one block at a time.
if (buffer_blocks < 1)
buffer_blocks = 1;
brillo::Blob buf(buffer_blocks * block_size);
HashCalculator source_hasher;
uint64_t blocks_left = total_blocks;
while (blocks_left > 0) {
uint64_t read_blocks = std::min(blocks_left, buffer_blocks);
TEST_AND_RETURN_FALSE(reader.Read(buf.data(), read_blocks * block_size));
if (hash_out) {
TEST_AND_RETURN_FALSE(
source_hasher.Update(buf.data(), read_blocks * block_size));
}
TEST_AND_RETURN_FALSE(writer.Write(buf.data(), read_blocks * block_size));
blocks_left -= read_blocks;
}
TEST_AND_RETURN_FALSE(writer.End());
if (hash_out) {
TEST_AND_RETURN_FALSE(source_hasher.Finalize());
*hash_out = source_hasher.raw_hash();
}
return true;
}
} // namespace fd_utils
} // namespace chromeos_update_engine
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