net/base/file_stream.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/base/file_stream.h"
   6
   7 #include "base/profiler/scoped_tracker.h"
   8 #include "net/base/file_stream_context.h"
   9 #include "net/base/net_errors.h"
  10
  11 namespace net {
  12
  13 FileStream::FileStream(const scoped_refptr<base::TaskRunner>& task_runner)
  14     : context_(new Context(task_runner)) {
  15 }
  16
  17 FileStream::FileStream(base::File file,
  18                        const scoped_refptr<base::TaskRunner>& task_runner)
  19     : context_(new Context(file.Pass(), task_runner)) {
  20 }
  21
  22 FileStream::~FileStream() {
  23   context_.release()->Orphan();
  24 }
  25
  26 int FileStream::Open(const base::FilePath& path, int open_flags,
  27                      const CompletionCallback& callback) {
  28   if (IsOpen()) {
  29     DLOG(FATAL) << "File is already open!";
  30     return ERR_UNEXPECTED;
  31   }
  32
  33   DCHECK(open_flags & base::File::FLAG_ASYNC);
  34   context_->Open(path, open_flags, callback);
  35   return ERR_IO_PENDING;
  36 }
  37
  38 int FileStream::Close(const CompletionCallback& callback) {
  39   context_->Close(callback);
  40   return ERR_IO_PENDING;
  41 }
  42
  43 bool FileStream::IsOpen() const {
  44   return context_->file().IsValid();
  45 }
  46
  47 int FileStream::Seek(base::File::Whence whence,
  48                      int64 offset,
  49                      const Int64CompletionCallback& callback) {
  50   if (!IsOpen())
  51     return ERR_UNEXPECTED;
  52
  53   context_->Seek(whence, offset, callback);
  54   return ERR_IO_PENDING;
  55 }
  56
  57 int FileStream::Read(IOBuffer* buf,
  58                      int buf_len,
  59                      const CompletionCallback& callback) {
  60   // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
  61   tracked_objects::ScopedTracker tracking_profile(
  62       FROM_HERE_WITH_EXPLICIT_FUNCTION("423948 FileStream::Read"));
  63
  64   if (!IsOpen())
  65     return ERR_UNEXPECTED;
  66
  67   // read(..., 0) will return 0, which indicates end-of-file.
  68   DCHECK_GT(buf_len, 0);
  69
  70   return context_->Read(buf, buf_len, callback);
  71 }
  72
  73 int FileStream::Write(IOBuffer* buf,
  74                       int buf_len,
  75                       const CompletionCallback& callback) {
  76   if (!IsOpen())
  77     return ERR_UNEXPECTED;
  78
  79   DCHECK_GE(buf_len, 0);
  80   return context_->Write(buf, buf_len, callback);
  81 }
  82
  83 int FileStream::Flush(const CompletionCallback& callback) {
  84   if (!IsOpen())
  85     return ERR_UNEXPECTED;
  86
  87   context_->Flush(callback);
  88   return ERR_IO_PENDING;
  89 }
  90
  91 const base::File& FileStream::GetFileForTesting() const {
  92   return context_->file();
  93 }
  94
  95 }  // namespace net