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60 lines
1.6 KiB
60 lines
1.6 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/file_writer.h"
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#include <errno.h>
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namespace chromeos_update_engine {
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int DirectFileWriter::Open(const char* path, int flags, mode_t mode) {
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CHECK_EQ(fd_, -1);
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fd_ = open(path, flags, mode);
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if (fd_ < 0)
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return -errno;
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return 0;
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}
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bool DirectFileWriter::Write(const void* bytes, size_t count) {
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CHECK_GE(fd_, 0);
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const char* char_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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ssize_t rc = write(fd_, char_bytes + bytes_written, count - bytes_written);
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if (rc < 0)
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return false;
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bytes_written += rc;
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}
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CHECK_EQ(bytes_written, count);
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return bytes_written == count;
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}
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int DirectFileWriter::Close() {
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CHECK_GE(fd_, 0);
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int rc = close(fd_);
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// This can be any negative number that's not -1. This way, this FileWriter
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// won't be used again for another file.
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fd_ = -2;
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if (rc < 0)
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return -errno;
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return rc;
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}
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} // namespace chromeos_update_engine
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