blob: 63edcb5aed15f36ad1148e835fb2ef087df65f27 [file] [log] [blame]
/*
* 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 <io.h>
#include "rtc_base/win32.h"
#include <limits> // NOLINT: win32.h should be considered a system header
#include "rtc_base/checks.h"
namespace rtc {
size_t File::Write(const uint8_t* data, size_t length) {
RTC_DCHECK_LT(length, std::numeric_limits<DWORD>::max());
size_t total_written = 0;
do {
DWORD written;
if (!::WriteFile(file_, data + total_written,
static_cast<DWORD>(length - total_written), &written,
nullptr)) {
break;
}
total_written += written;
} while (total_written < length);
return total_written;
}
size_t File::Read(uint8_t* buffer, size_t length) {
RTC_DCHECK_LT(length, std::numeric_limits<DWORD>::max());
size_t total_read = 0;
do {
DWORD read;
if (!::ReadFile(file_, buffer + total_read,
static_cast<DWORD>(length - total_read), &read, nullptr)) {
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) {
RTC_DCHECK_LT(length, std::numeric_limits<DWORD>::max());
size_t total_written = 0;
do {
DWORD written;
LARGE_INTEGER offset_li;
offset_li.QuadPart = offset + total_written;
OVERLAPPED overlapped = {0};
overlapped.Offset = offset_li.LowPart;
overlapped.OffsetHigh = offset_li.HighPart;
if (!::WriteFile(file_, data + total_written,
static_cast<DWORD>(length - total_written), &written,
&overlapped)) {
break;
}
total_written += written;
} while (total_written < length);
return total_written;
}
size_t File::ReadAt(uint8_t* buffer, size_t length, size_t offset) {
RTC_DCHECK_LT(length, std::numeric_limits<DWORD>::max());
size_t total_read = 0;
do {
DWORD read;
LARGE_INTEGER offset_li;
offset_li.QuadPart = offset + total_read;
OVERLAPPED overlapped = {0};
overlapped.Offset = offset_li.LowPart;
overlapped.OffsetHigh = offset_li.HighPart;
if (!::ReadFile(file_, buffer + total_read,
static_cast<DWORD>(length - total_read), &read,
&overlapped)) {
break;
}
total_read += read;
} while (total_read < length);
return total_read;
}
bool File::Seek(size_t offset) {
LARGE_INTEGER distance;
distance.QuadPart = offset;
return SetFilePointerEx(file_, distance, nullptr, FILE_BEGIN) != 0;
}
bool File::Close() {
if (file_ == kInvalidPlatformFileValue)
return false;
bool ret = CloseHandle(file_) != 0;
file_ = kInvalidPlatformFileValue;
return ret;
}
} // namespace rtc