//
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// Copyright (C) 2009 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/payload_consumer/extent_writer.h"
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#include <errno.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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#include "update_engine/common/utils.h"
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#include "update_engine/payload_consumer/payload_constants.h"
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using std::min;
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namespace chromeos_update_engine {
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bool DirectExtentWriter::Write(const void* bytes, size_t count) {
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if (count == 0)
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return true;
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const char* c_bytes = reinterpret_cast<const char*>(bytes);
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size_t bytes_written = 0;
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while (bytes_written < count) {
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TEST_AND_RETURN_FALSE(cur_extent_ != extents_.end());
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uint64_t bytes_remaining_cur_extent =
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cur_extent_->num_blocks() * block_size_ - extent_bytes_written_;
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CHECK_NE(bytes_remaining_cur_extent, static_cast<uint64_t>(0));
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size_t bytes_to_write =
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static_cast<size_t>(min(static_cast<uint64_t>(count - bytes_written),
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bytes_remaining_cur_extent));
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TEST_AND_RETURN_FALSE(bytes_to_write > 0);
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if (cur_extent_->start_block() != kSparseHole) {
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const off64_t offset =
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cur_extent_->start_block() * block_size_ + extent_bytes_written_;
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TEST_AND_RETURN_FALSE_ERRNO(fd_->Seek(offset, SEEK_SET) !=
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static_cast<off64_t>(-1));
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TEST_AND_RETURN_FALSE(
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utils::WriteAll(fd_, c_bytes + bytes_written, bytes_to_write));
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}
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bytes_written += bytes_to_write;
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extent_bytes_written_ += bytes_to_write;
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if (bytes_remaining_cur_extent == bytes_to_write) {
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// We filled this extent
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CHECK_EQ(extent_bytes_written_, cur_extent_->num_blocks() * block_size_);
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// move to next extent
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extent_bytes_written_ = 0;
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cur_extent_++;
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}
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}
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return true;
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}
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} // namespace chromeos_update_engine
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