win: Add open equivalent

util/file/file_writer_posix.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/file/file_writer.h"
 
 #include <algorithm>
 
 #include <limits.h>
 
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
-#include "util/file/file_io.h"
 
 namespace crashpad {
 
 // Ensure type compatibility between WritableIoVec and iovec.
 static_assert(sizeof(WritableIoVec) == sizeof(iovec), "WritableIoVec size");
 static_assert(offsetof(WritableIoVec, iov_base) == offsetof(iovec, iov_base),
               "WritableIoVec base offset");
 static_assert(offsetof(WritableIoVec, iov_len) == offsetof(iovec, iov_len),
               "WritableIoVec len offset");
 
-FileWriter::FileWriter() : fd_() {
-}
-
-FileWriter::~FileWriter() {
-}
-
-bool FileWriter::Open(const base::FilePath& path, int oflag, mode_t mode) {
-  CHECK(!fd_.is_valid());
+bool FileWriter::Open(const base::FilePath& path, int oflag, uint32_t mode) {
+  CHECK(!file.is_valid());
 
   DCHECK((oflag & O_WRONLY) || (oflag & O_RDWR));
 
-  fd_.reset(HANDLE_EINTR(open(path.value().c_str(), oflag, mode)));
-  if (!fd_.is_valid()) {
+  file.reset(HANDLE_EINTR(open(path.value().c_str(), oflag, mode)));
+  if (!file.is_valid()) {
     PLOG(ERROR) << "open " << path.value();
     return false;
   }
 
   return true;
 }
 
-void FileWriter::Close() {
-  CHECK(fd_.is_valid());
-
-  fd_.reset();
-}
-
-bool FileWriter::Write(const void* data, size_t size) {
-  DCHECK(fd_.is_valid());
-
-  // TODO(mark): Write no more than SSIZE_MAX bytes in a single call.
-  ssize_t written = WriteFile(fd_.get(), data, size);
-  if (written < 0) {
-    PLOG(ERROR) << "write";
-    return false;
-  } else if (written == 0) {
-    LOG(ERROR) << "write: returned 0";
-    return false;
-  }
-
-  return true;
-}
-
 bool FileWriter::WriteIoVec(std::vector<WritableIoVec>* iovecs) {
   DCHECK(fd_.is_valid());
 
   ssize_t size = 0;
   for (const WritableIoVec& iov : *iovecs) {
     // TODO(mark): Check to avoid overflow of ssize_t, and fail with EINVAL.
     size += iov.iov_len;
   }
 
   // Get an iovec*, because that’s what writev wants. The only difference
@@ skipping 44 matching lines @@
 
 #ifndef NDEBUG
   // The interface says that |iovecs| is not sacred, so scramble it to make sure
   // that nobody depends on it.
   memset(&(*iovecs)[0], 0xa5, sizeof((*iovecs)[0]) * iovecs->size());
 #endif
 
   return true;
 }
 
-off_t FileWriter::Seek(off_t offset, int whence) {
-  DCHECK(fd_.is_valid());
+FileOffset FileWriter::Seek(FileOffset offset, int whence) {
+  DCHECK(file_.is_valid());
 
-  off_t rv = lseek(fd_.get(), offset, whence);
+  off_t rv = lseek(file_.get(), offset, whence);
   if (rv < 0) {
     PLOG(ERROR) << "lseek";
   }
 
   return rv;
 }
 
 }  // namespace crashpad