Remove usage of compat from client

util/file/file_io.h

 // 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,
@@ skipping 49 matching lines @@
 
 //! \brief Platform-specific alias for a position in an open file.
 using FileOffset = off_t;
 
 //! \brief Scoped wrapper of a FileHandle.
 using ScopedFileHandle = base::ScopedFD;
 
 //! \brief A value that can never be a valid FileHandle.
 const FileHandle kInvalidFileHandle = -1;
 
+using FileOperationResult = ssize_t;
+
 #elif defined(OS_WIN)
 
 using FileHandle = HANDLE;
 using FileOffset = LONGLONG;
 using ScopedFileHandle = ScopedFileHANDLE;
+using FileOperationResult = LONG_PTR;
 
 const FileHandle kInvalidFileHandle = INVALID_HANDLE_VALUE;
 
 #endif
 
 //! \brief Determines the mode that LoggingOpenFileForWrite() uses.
 enum class FileWriteMode {
   //! \brief Opens the file if it exists, or fails if it does not.
   kReuseOrFail,
 
@@ skipping 34 matching lines @@
 //! sockets is not currently supported.
 //!
 //! \return The number of bytes read and placed into \a buffer, or `-1` on
 //!     error, with `errno` or `GetLastError()` set appropriately. On error, a
 //!     portion of \a file may have been read into \a buffer.
 //!
 //! \sa WriteFile
 //! \sa LoggingReadFile
 //! \sa CheckedReadFile
 //! \sa CheckedReadFileAtEOF
-ssize_t ReadFile(FileHandle file, void* buffer, size_t size);
+FileOperationResult ReadFile(FileHandle file, void* buffer, size_t size);
 
 //! \brief Writes to a file, retrying when interrupted or following a short
 //!     write on POSIX.
 //!
 //! This function writes to \a file, stopping only when \a size bytes have been
 //! written.
 //!
 //! \return The number of bytes written from \a buffer, or `-1` on error, with
 //!     `errno` or `GetLastError()` set appropriately. On error, a portion of
 //!     \a buffer may have been written to \a file.
 //!
 //! \sa ReadFile
 //! \sa LoggingWriteFile
 //! \sa CheckedWriteFile
-ssize_t WriteFile(FileHandle file, const void* buffer, size_t size);
+FileOperationResult WriteFile(FileHandle file, const void* buffer, size_t size);
 
 //! \brief Wraps ReadFile(), ensuring that exactly \a size bytes are read.
 //!
 //! \return `true` on success. If \a size is out of the range of possible
 //!     ReadFile() return values, if the underlying ReadFile() fails, or if
 //!     other than \a size bytes were read, this function logs a message and
 //!     returns `false`.
 //!
 //! \sa LoggingWriteFile
 //! \sa ReadFile
@@ skipping 180 matching lines @@
 
 //! \brief Wraps `close()` or `CloseHandle()`, ensuring that it succeeds.
 //!
 //! If the underlying function fails, this function causes execution to
 //! terminate without returning.
 void CheckedCloseFile(FileHandle file);
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_FILE_FILE_IO_H_