971eb27e54
BUG= R=perkj@webrtc.org, sprang@google.com Review URL: https://codereview.webrtc.org/2347473003 . Cr-Commit-Position: refs/heads/master@{#14250}
97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/base/file.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <limits>
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#include "webrtc/base/checks.h"
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namespace rtc {
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size_t File::Write(const uint8_t* data, size_t length) {
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size_t total_written = 0;
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do {
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ssize_t written;
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do {
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written = ::write(file_, data + total_written, length - total_written);
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} while (written == -1 && errno == EINTR);
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if (written == -1)
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break;
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total_written += written;
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} while (total_written < length);
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return total_written;
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}
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size_t File::Read(uint8_t* buffer, size_t length) {
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size_t total_read = 0;
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do {
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ssize_t read;
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do {
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read = ::read(file_, buffer + total_read, length - total_read);
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} while (read == -1 && errno == EINTR);
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if (read == -1)
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break;
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total_read += read;
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} while (total_read < length);
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return total_read;
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}
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size_t File::WriteAt(const uint8_t* data, size_t length, size_t offset) {
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size_t total_written = 0;
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do {
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ssize_t written;
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do {
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written = ::pwrite(file_, data + total_written, length - total_written,
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offset + total_written);
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} while (written == -1 && errno == EINTR);
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if (written == -1)
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break;
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total_written += written;
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} while (total_written < length);
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return total_written;
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}
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size_t File::ReadAt(uint8_t* buffer, size_t length, size_t offset) {
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size_t total_read = 0;
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do {
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ssize_t read;
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do {
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read = ::pread(file_, buffer + total_read, length - total_read,
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offset + total_read);
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} while (read == -1 && errno == EINTR);
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if (read == -1)
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break;
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total_read += read;
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} while (total_read < length);
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return total_read;
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}
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bool File::Seek(size_t offset) {
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RTC_DCHECK_LE(offset, static_cast<size_t>(std::numeric_limits<off_t>::max()));
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return lseek(file_, static_cast<off_t>(offset), SEEK_SET) != -1;
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}
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bool File::Close() {
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if (file_ == rtc::kInvalidPlatformFileValue)
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return false;
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bool ret = close(file_) == 0;
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file_ = rtc::kInvalidPlatformFileValue;
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return ret;
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}
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} // namespace rtc
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