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(std::unique_ptr<OutputStream> out)23 BufferedOutputStream::BufferedOutputStream(std::unique_ptr<OutputStream> out)
24 : OutputStream(out->GetLocation()), // Before out is moved to out_.
25 out_(std::move(out)),
26 used_(0) {}
27
~BufferedOutputStream()28 BufferedOutputStream::~BufferedOutputStream() {
29 FlushBuffer();
30 }
31
WriteFully(const void * buffer,size_t byte_count)32 bool BufferedOutputStream::WriteFully(const void* buffer, size_t byte_count) {
33 if (byte_count > kBufferSize) {
34 if (!FlushBuffer()) {
35 return false;
36 }
37 return out_->WriteFully(buffer, byte_count);
38 }
39 if (used_ + byte_count > kBufferSize) {
40 if (!FlushBuffer()) {
41 return false;
42 }
43 }
44 const uint8_t* src = reinterpret_cast<const uint8_t*>(buffer);
45 memcpy(&buffer_[used_], src, byte_count);
46 used_ += byte_count;
47 return true;
48 }
49
Flush()50 bool BufferedOutputStream::Flush() {
51 return FlushBuffer() && out_->Flush();
52 }
53
FlushBuffer()54 bool BufferedOutputStream::FlushBuffer() {
55 bool success = true;
56 if (used_ > 0) {
57 success = out_->WriteFully(&buffer_[0], used_);
58 used_ = 0;
59 }
60 return success;
61 }
62
Seek(off_t offset,Whence whence)63 off_t BufferedOutputStream::Seek(off_t offset, Whence whence) {
64 if (!FlushBuffer()) {
65 return -1;
66 }
67 return out_->Seek(offset, whence);
68 }
69
70 } // namespace art
71