Index: chrome/browser/chromeos/file_system_provider/operations/read_file.cc |
diff --git a/chrome/browser/chromeos/file_system_provider/operations/read_file.cc b/chrome/browser/chromeos/file_system_provider/operations/read_file.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..55ba7b09829170cf6d5bcfe11d0eba86446ab18b |
--- /dev/null |
+++ b/chrome/browser/chromeos/file_system_provider/operations/read_file.cc |
@@ -0,0 +1,93 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "chrome/browser/chromeos/file_system_provider/operations/read_file.h" |
+ |
+#include <limits> |
+#include <string> |
+ |
+#include "chrome/common/extensions/api/file_system_provider.h" |
+#include "chrome/common/extensions/api/file_system_provider_internal.h" |
+ |
+namespace chromeos { |
+namespace file_system_provider { |
+namespace operations { |
+namespace { |
+ |
+// Convert |value| into |output|. If parsing fails, then returns a negative |
+// value. Otherwise returns number of bytes written to the buffer. |
+int CopyRequestValueToBuffer(scoped_ptr<RequestValue> value, |
+ net::IOBuffer* buffer, |
+ int buffer_offset, |
+ int buffer_length) { |
+ using extensions::api::file_system_provider_internal:: |
+ ReadFileRequestedSuccess::Params; |
+ |
+ const Params* params = value->read_file_success_params(); |
+ if (!params) |
+ return -1; |
+ |
+ const size_t chunk_size = params->data.length(); |
+ |
+ // Check for overflows. |
+ if (chunk_size > static_cast<size_t>(buffer_length) - buffer_offset) |
+ return -1; |
+ |
+ memcpy(buffer->data() + buffer_offset, params->data.c_str(), chunk_size); |
+ |
+ return chunk_size; |
+} |
+ |
+} // namespace |
+ |
+ReadFile::ReadFile( |
+ extensions::EventRouter* event_router, |
+ const ProvidedFileSystemInfo& file_system_info, |
+ int file_handle, |
+ net::IOBuffer* buffer, |
+ int64 offset, |
+ int length, |
+ const ProvidedFileSystemInterface::ReadChunkReceivedCallback& callback) |
+ : Operation(event_router, file_system_info), |
+ file_handle_(file_handle), |
+ buffer_(buffer), |
+ offset_(offset), |
+ length_(length), |
+ current_offset_(offset), |
+ callback_(callback) { |
+} |
+ |
+ReadFile::~ReadFile() { |
+} |
+ |
+bool ReadFile::Execute(int request_id) { |
+ scoped_ptr<base::ListValue> values(new base::ListValue); |
+ values->AppendInteger(file_handle_); |
+ values->AppendDouble(offset_); |
+ values->AppendInteger(length_); |
+ return SendEvent( |
+ request_id, |
+ extensions::api::file_system_provider::OnReadFileRequested::kEventName, |
+ values.Pass()); |
+} |
+ |
+void ReadFile::OnSuccess(int /* request_id */, |
+ scoped_ptr<RequestValue> result, |
+ bool has_next) { |
+ const int copy_result = CopyRequestValueToBuffer( |
+ result.Pass(), buffer_, current_offset_, length_); |
+ DCHECK_LE(0, copy_result); |
+ DCHECK(!has_next || copy_result > 0); |
+ if (copy_result > 0) |
+ current_offset_ += copy_result; |
+ callback_.Run(copy_result, has_next, base::File::FILE_OK); |
+} |
+ |
+void ReadFile::OnError(int /* request_id */, base::File::Error error) { |
+ callback_.Run(0 /* chunk_length */, false /* has_next */, error); |
+} |
+ |
+} // namespace operations |
+} // namespace file_system_provider |
+} // namespace chromeos |