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71 lines
2.5 KiB
71 lines
2.5 KiB
// |
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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 (count - bytes_written > 0) { |
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TEST_AND_RETURN_FALSE(next_extent_index_ < extents_.size()); |
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uint64_t bytes_remaining_next_extent = |
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extents_[next_extent_index_].num_blocks() * block_size_ - |
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extent_bytes_written_; |
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CHECK_NE(bytes_remaining_next_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_next_extent)); |
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TEST_AND_RETURN_FALSE(bytes_to_write > 0); |
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if (extents_[next_extent_index_].start_block() != kSparseHole) { |
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const off64_t offset = |
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extents_[next_extent_index_].start_block() * block_size_ + |
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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_next_extent == bytes_to_write) { |
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// We filled this extent |
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CHECK_EQ(extent_bytes_written_, |
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extents_[next_extent_index_].num_blocks() * block_size_); |
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// move to next extent |
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extent_bytes_written_ = 0; |
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next_extent_index_++; |
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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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