Copy Crashpad into the Chrome tree instead of importing it via DEPS

third_party/crashpad/crashpad/util/file/file_writer.cc

Index: third_party/crashpad/crashpad/util/file/file_writer.cc
diff --git a/third_party/crashpad/crashpad/util/file/file_writer.cc b/third_party/crashpad/crashpad/util/file/file_writer.cc
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index 0000000000000000000000000000000000000000..00a323e54f74fa79ad5d696625b62a655222a268
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+++ b/third_party/crashpad/crashpad/util/file/file_writer.cc
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+// 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/numerics/safe_conversions.h"
+#include "build/build_config.h"
+#include "util/misc/implicit_cast.h"
+
+#if defined(OS_POSIX)
+#include <sys/uio.h>
+#include <unistd.h>
+#include "base/posix/eintr_wrapper.h"
+#endif  // OS_POSIX
+
+namespace crashpad {
+
+#if defined(OS_POSIX)
+// 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");
+#endif  // OS_POSIX
+
+WeakFileHandleFileWriter::WeakFileHandleFileWriter(FileHandle file_handle)
+    : file_handle_(file_handle) {
+}
+
+WeakFileHandleFileWriter::~WeakFileHandleFileWriter() {
+}
+
+bool WeakFileHandleFileWriter::Write(const void* data, size_t size) {
+  DCHECK_NE(file_handle_, kInvalidFileHandle);
+  return LoggingWriteFile(file_handle_, data, size);
+}
+
+bool WeakFileHandleFileWriter::WriteIoVec(std::vector<WritableIoVec>* iovecs) {
+  DCHECK_NE(file_handle_, kInvalidFileHandle);
+
+#if defined(OS_POSIX)
+
+  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
+  // between WritableIoVec and iovec is that WritableIoVec’s iov_base is a
+  // pointer to a const buffer, where iovec’s iov_base isn’t. writev doesn’t
+  // actually write to the data, so this cast is safe here. iovec’s iov_base is
+  // non-const because the same structure is used for readv and writev, and
+  // readv needs to write to the buffer that iov_base points to.
+  iovec* iov = reinterpret_cast<iovec*>(&(*iovecs)[0]);
+  size_t remaining_iovecs = iovecs->size();
+
+  while (size > 0) {
+    size_t writev_iovec_count =
+        std::min(remaining_iovecs, implicit_cast<size_t>(IOV_MAX));
+    ssize_t written =
+        HANDLE_EINTR(writev(file_handle_, iov, writev_iovec_count));
+    if (written < 0) {
+      PLOG(ERROR) << "writev";
+      return false;
+    } else if (written == 0) {
+      LOG(ERROR) << "writev: returned 0";
+      return false;
+    }
+
+    size -= written;
+    DCHECK_GE(size, 0);
+
+    if (size == 0) {
+      remaining_iovecs = 0;
+      break;
+    }
+
+    while (written > 0) {
+      size_t wrote_this_iovec =
+          std::min(implicit_cast<size_t>(written), iov->iov_len);
+      written -= wrote_this_iovec;
+      if (wrote_this_iovec < iov->iov_len) {
+        iov->iov_base =
+            reinterpret_cast<char*>(iov->iov_base) + wrote_this_iovec;
+        iov->iov_len -= wrote_this_iovec;
+      } else {
+        ++iov;
+        --remaining_iovecs;
+      }
+    }
+  }
+
+  DCHECK_EQ(remaining_iovecs, 0u);
+
+#else  // !OS_POSIX
+
+  for (const WritableIoVec& iov : *iovecs) {
+    if (!Write(iov.iov_base, iov.iov_len))
+      return false;
+  }
+
+#endif  // OS_POSIX
+
+#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;
+}
+
+FileOffset WeakFileHandleFileWriter::Seek(FileOffset offset, int whence) {
+  DCHECK_NE(file_handle_, kInvalidFileHandle);
+  return LoggingSeekFile(file_handle_, offset, whence);
+}
+
+FileWriter::FileWriter()
+    : file_(),
+      weak_file_handle_file_writer_(kInvalidFileHandle) {
+}
+
+FileWriter::~FileWriter() {
+}
+
+bool FileWriter::Open(const base::FilePath& path,
+                      FileWriteMode write_mode,
+                      FilePermissions permissions) {
+  CHECK(!file_.is_valid());
+  file_.reset(LoggingOpenFileForWrite(path, write_mode, permissions));
+  if (!file_.is_valid()) {
+    return false;
+  }
+
+  weak_file_handle_file_writer_.set_file_handle(file_.get());
+  return true;
+}
+
+void FileWriter::Close() {
+  CHECK(file_.is_valid());
+
+  weak_file_handle_file_writer_.set_file_handle(kInvalidFileHandle);
+  file_.reset();
+}
+
+bool FileWriter::Write(const void* data, size_t size) {
+  DCHECK(file_.is_valid());
+  return weak_file_handle_file_writer_.Write(data, size);
+}
+
+bool FileWriter::WriteIoVec(std::vector<WritableIoVec>* iovecs) {
+  DCHECK(file_.is_valid());
+  return weak_file_handle_file_writer_.WriteIoVec(iovecs);
+}
+
+FileOffset FileWriter::Seek(FileOffset offset, int whence) {
+  DCHECK(file_.is_valid());
+  return weak_file_handle_file_writer_.Seek(offset, whence);
+}
+
+}  // namespace crashpad