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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/file.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits>
#include "rtc_base/checks.h"
namespace rtc {
size_t File::Write(const uint8_t* data, size_t length) {
size_t total_written = 0;
do {
ssize_t written;
do {
written = ::write(file_, data + total_written, length - total_written);
} while (written == -1 && errno == EINTR);
if (written == -1)
break;
total_written += written;
} while (total_written < length);
return total_written;
}
size_t File::Read(uint8_t* buffer, size_t length) {
size_t total_read = 0;
do {
ssize_t read;
do {
read = ::read(file_, buffer + total_read, length - total_read);
} while (read == -1 && errno == EINTR);
if (read == -1)
break;
total_read += read;
} while (total_read < length);
return total_read;
}
size_t File::WriteAt(const uint8_t* data, size_t length, size_t offset) {
size_t total_written = 0;
do {
ssize_t written;
do {
written = ::pwrite(file_, data + total_written, length - total_written,
offset + total_written);
} while (written == -1 && errno == EINTR);
if (written == -1)
break;
total_written += written;
} while (total_written < length);
return total_written;
}
size_t File::ReadAt(uint8_t* buffer, size_t length, size_t offset) {
size_t total_read = 0;
do {
ssize_t read;
do {
read = ::pread(file_, buffer + total_read, length - total_read,
offset + total_read);
} while (read == -1 && errno == EINTR);
if (read == -1)
break;
total_read += read;
} while (total_read < length);
return total_read;
}
bool File::Seek(size_t offset) {
RTC_DCHECK_LE(offset, std::numeric_limits<off_t>::max());
return lseek(file_, static_cast<off_t>(offset), SEEK_SET) != -1;
}
bool File::Close() {
if (file_ == rtc::kInvalidPlatformFileValue)
return false;
bool ret = close(file_) == 0;
file_ = rtc::kInvalidPlatformFileValue;
return ret;
}
} // namespace rtc
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