1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "buffered_output_stream.h"
18
19 #include <string.h>
20
21 namespace art {
22
BufferedOutputStream(OutputStream * out)23 BufferedOutputStream::BufferedOutputStream(OutputStream* out)
24 : OutputStream(out->GetLocation()), out_(out), used_(0) {}
25
WriteFully(const void * buffer,int64_t byte_count)26 bool BufferedOutputStream::WriteFully(const void* buffer, int64_t byte_count) {
27 if (byte_count > kBufferSize) {
28 Flush();
29 return out_->WriteFully(buffer, byte_count);
30 }
31 if (used_ + byte_count > kBufferSize) {
32 bool success = Flush();
33 if (!success) {
34 return false;
35 }
36 }
37 const uint8_t* src = reinterpret_cast<const uint8_t*>(buffer);
38 memcpy(&buffer_[used_], src, byte_count);
39 used_ += byte_count;
40 return true;
41 }
42
Flush()43 bool BufferedOutputStream::Flush() {
44 bool success = true;
45 if (used_ > 0) {
46 success = out_->WriteFully(&buffer_[0], used_);
47 used_ = 0;
48 }
49 return success;
50 }
51
Seek(off_t offset,Whence whence)52 off_t BufferedOutputStream::Seek(off_t offset, Whence whence) {
53 if (!Flush()) {
54 return -1;
55 }
56 return out_->Seek(offset, whence);
57 }
58
59 } // namespace art
60