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_->IsOpen();
  45 }
  46
  47 int FileStream::Seek(int64_t offset, const Int64CompletionCallback& callback) {
  48   if (!IsOpen())
  49     return ERR_UNEXPECTED;
  50
  51   context_->Seek(offset, callback);
  52   return ERR_IO_PENDING;
  53 }
  54
  55 int FileStream::Read(IOBuffer* buf,
  56                      int buf_len,
  57                      const CompletionCallback& callback) {
  58   // TODO(rvargas): Remove ScopedTracker below once crbug.com/475751 is fixed.
  59   tracked_objects::ScopedTracker tracking_profile(
  60       FROM_HERE_WITH_EXPLICIT_FUNCTION("475751 FileStream::Read"));
  61
  62   if (!IsOpen())
  63     return ERR_UNEXPECTED;
  64
  65   // read(..., 0) will return 0, which indicates end-of-file.
  66   DCHECK_GT(buf_len, 0);
  67
  68   return context_->Read(buf, buf_len, callback);
  69 }
  70
  71 int FileStream::Write(IOBuffer* buf,
  72                       int buf_len,
  73                       const CompletionCallback& callback) {
  74   if (!IsOpen())
  75     return ERR_UNEXPECTED;
  76
  77   DCHECK_GE(buf_len, 0);
  78   return context_->Write(buf, buf_len, callback);
  79 }
  80
  81 int FileStream::Flush(const CompletionCallback& callback) {
  82   if (!IsOpen())
  83     return ERR_UNEXPECTED;
  84
  85   context_->Flush(callback);
  86   return ERR_IO_PENDING;
  87 }
  88
  89 }  // namespace net